This document is a seminar report on micro turbines submitted by Rajneesh Kumar Singh in partial fulfillment of the requirements for a Bachelor of Technology degree in Mechanical Engineering. The report provides an overview of micro turbines, including their design, operation, advantages, and applications. It includes sections on gas turbine cycles, characteristics of micro turbines, components of micro turbines, and conclusions.
A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work. More specifically, a closed-cycle regenerative heat engine with a permanently gaseous working fluid.
A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work. More specifically, a closed-cycle regenerative heat engine with a permanently gaseous working fluid.
This project of Maglev windmill on the implementation of an alternate configuration of a wind turbine for power generation purposes. Using the effects of magnetic repulsion, spiral shaped wind turbine blades will be fitted on a rod for stability during rotation and suspended on magnets as a replacement for ball bearings which are normally used on conventional wind turbines. Power will then be generated with an axial flux generator, which incorporates the use of permanent magnets and a set of coils.
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A flywheel, in essence is a mechanical battery - simply a mass rotating about an axis.Flywheels store energy mechanically in the form of kinetic energy.They take an electrical input to accelerate the rotor up to speed by using the built-in motor, and return the electrical energy by using this same motor as a generator.Flywheels are one of the most promising technologies for replacing conventional lead acid batteries as energy storage systems.
Battery electric vehicle, plug-in hybrid electric vehicle, conventional vehicle and now fuel cell vehicles. With the advancement of technology new inventions have been made in auto industry in past few years. Do you know what fuel cell vehicle is? This presentation attributes the features of fuel cell vehicles and how it differs from battery electric, plug-in hybrid electric and conventional vehicles. Also have some light on its feasibility and merits & demerits.
Combined Heat and Power (CHP) generation. The use of industrial power and heat, resulting into high efficiency of the industrial unit and high profits. Reliability on energy provider is reduced.
This project of Maglev windmill on the implementation of an alternate configuration of a wind turbine for power generation purposes. Using the effects of magnetic repulsion, spiral shaped wind turbine blades will be fitted on a rod for stability during rotation and suspended on magnets as a replacement for ball bearings which are normally used on conventional wind turbines. Power will then be generated with an axial flux generator, which incorporates the use of permanent magnets and a set of coils.
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A flywheel, in essence is a mechanical battery - simply a mass rotating about an axis.Flywheels store energy mechanically in the form of kinetic energy.They take an electrical input to accelerate the rotor up to speed by using the built-in motor, and return the electrical energy by using this same motor as a generator.Flywheels are one of the most promising technologies for replacing conventional lead acid batteries as energy storage systems.
Battery electric vehicle, plug-in hybrid electric vehicle, conventional vehicle and now fuel cell vehicles. With the advancement of technology new inventions have been made in auto industry in past few years. Do you know what fuel cell vehicle is? This presentation attributes the features of fuel cell vehicles and how it differs from battery electric, plug-in hybrid electric and conventional vehicles. Also have some light on its feasibility and merits & demerits.
Combined Heat and Power (CHP) generation. The use of industrial power and heat, resulting into high efficiency of the industrial unit and high profits. Reliability on energy provider is reduced.
A gas turbine, also called a combustion turbine, is a type of internal combustion engine. It has an upstream rotating compressor coupled toa downstream turbine, and a combustion chamber in-between. Energy is added to the gas stream in the combustor, where fuel is mixed with air and ignited. In the high-pressure environment of the combustor, combustion of the fuel increases the temperature. The products of the combustion are forced into the turbine section
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Microturbines are a green new way to power buildings while heating and cooling them. Also, microturbines burn waste gas from landfills, sewage treatment plants, farms and the like, turning it into clean electricity for the electric grid.
A OVERVIEW OF THE RANKIN CYCLE-BASED HEAT EXCHANGER USED IN INTERNAL COMBUSTI...IAEME Publication
The majority of the heat produced by automobiles, primarily by diesel engines, is squandered in various ways. If this waste heat is collected, it can be applied in a variety of other ways. Recently, increased emphasis has been placed on the global issue of rapid economic growth, a relative energy scarcity, internal combustion engine exhaust waste heat, and environmental degradation. The remaining heat is released into the environment through exhaust gases and engine cooling systems, leading to an increase in entropy and significant environmental pollution, so it is necessary to convert waste heat into useful work. Of the total heat supplied to the engine in the form of fuel, approximately 30 to 40% is converted into useful mechanical work. At 4000 RPM, the exhaust gas temperature is at its highest. So a recovery system is created for a constant RPM of 4000. A shell and tube heat exchanger and a uniflow steam engine connected to the main engine make up the recovery system. By reducing the frictional power at the main engine's power stroke and idle stroke, the linked steam engine increases the efficiency of the main engine. Due to the additional recovery system, the system's initial cost is significant. But over time, the system turns out to be profitable.
Installation & Working of Coal Fired Thermal Power PlantMuhammad Awais
Statement of Submission:
It is certified that the following students of PRESTON University Islamabad (Mechanical Department) have successfully completed the project named Installation & Working of Coal Fired Thermal Power Plant. This project fulfills the complete requirement of the topic given by the project adviser.
PREFACE
This thesis ″Installation & Working of Coal Fired Thermal Power Plant ″ is made on a final semester project of B-Tech (Hons) Mechanical.
This thesis includes the basic concept of Coal Fired Thermal Power Plant, there principles, factors, types of Boilers, Coal, Turbines, calculation and basic design of C.F.T.P.P system for energy.
This thesis has been written according to rules and standards of ASME (American Society of Mechanical Engineers).
All the concepts, factors, calculations, design fulfills the proper rules of Coal Fired Thermal Power Plant according to ASME.
In this book the chapters contains the following
Introduction to Thermal coal fired power plant.
Introduction to Thermal coal fired power plant System
Coal
Boiler
Turbine
Generator
Transmission Line
Best Regards,
C.F.T.P.P Project Group
Study and Analysis of the Effect of Operating/Performance Parameters on the T...paperpublications3
Abstract: The main objective of this dissertation is to identify the barriers in increasing the thermal efficiency of Gas Turbine based power plants i.e. GTPP. The barriers in technology transfer implementation have been identified from literature review. These barriers may be of market, cultural, human resource .management, financial, economical, attitudinal, environmental, geographical and technological type. Technology transfer barriers threats the movement of physical structure, knowledge, skills, organization value and capital from the developed to developing countries. Clear understanding of these barriers may help the practitioners to find out various ways to deal with them. This may further facilitate successful implementation of technology transfer. Technology transfer may be said to be successful if Transferor (seller) and the transferee (buyer) can effectively utilize the technology for business gain. The transfer involves cost and expenditure that should be agreed by the transferee and transferor. The process is affected by various factors that hinder Technology Transfer. These factors named Barriers. In the present work, Interpretive Structure Modeling(ISM) is used for the analysis and comparison of various factors important for Technology Transfer. The important parameters are identified and self-interaction matrixes proposed with the help of Interpretive Structure Modeling which evaluates the inhibiting power of these parameters. This index can be used in comparison of different factors responsible for Technology Transfer processes.
Design and Analysis of Turbine Blades in a Micro Gas Turbine EngineIJTET Journal
This paper is based on the design and analysis of turbine blades in a micro gas turbine engine. Micro-gas
turbine engines offer advantages over the other technologies for small-scale power generation. A combustor is the heart
of any engine; where in the micro gas turbine, it should be compact, simple, inexpensive and robust in construction. The
burned gases from the combustor pass through the turbine blades. The designing and manufacturing of the turbine
blades are very difficult when the blade angle, blade size and shape are considered. The design of the turbine blade
passages is broadly based on aerodynamic considerations and it is to obtain optimum efficiency, compatibility with
compressor and combustor design. For this, the specifications of many micro gas turbine engines are taken by
conducting a literature survey to get the design data for an apt turbine blade. By these values, the flow parameters of the
engine are obtained and are taken for analyzing purposes to get increased momentum thrust. Here, the design is done by
using the software CATIA and it is then exported to FLUENT for analyzing. The result shows that the estimated design
and performance is achieved.
Modelling of solar micro gas turbine for parabolic dish based controller appl...TELKOMNIKA JOURNAL
Dish-Stirling unit and photovoltaic panels are the premier technologies available to generate off-grid solar energy. The major issue for both systems is in terms of producing output power. Air-Brayton cycle was utilized asan engine by converting the thermal energy to electricity. Micro gas turbine (MGT) has been recognized as one of the viable alternatives compared to Stirling engines, where it represents a state-of-art parabolic dish engine specifically in turbine gas technology. Hence, the microgas turbine is a technology that is capable of controlling low carbon while providing electricity in off-grid regions. MGT uses any gas as its input like natural gas, bio gas and others. Micro gas turbine has advantages for its high expansion ratio and less moving components. Compared to competing for diesel generators, the electricity costs from hybrid solar units were reduced between 10% and 43%, where as specific CO2 emissions reduced by 20-35%. MGT provides advantages over photovoltaic systems such as the inherent ability to hybridize the systems with hydrocarbon fuels to produce electricity around the clock, and the ability to operate more effectively in very hot climates with photovoltaic performance degradation over the life time of the system. Hybrid solar micro gas-turbines are cost-effective, eco-friendly and pollution free as they can work by burning any gas like natural gas,landfill gasa and others.This paper presented the controls contained in the MGT-dish system consisted of temperature control, fuel flow control, speed and acceleration control. Aconceptual design of the 25kW MGT-dish system was also covered.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
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• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
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Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
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COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
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introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Immunizing Image Classifiers Against Localized Adversary Attacks
Micro turbine seminar report
1. MICRO TURBINE
A Seminar Report
Submitted by
RAJNEESH KUMAR SINGH
In partial fulfilment for the award of the degree
Of
BACHELOR OF TECHNOLOGY
IN
MECHANICAL ENGINEERING
At
Buddha Institute of Technology
GIDA, Gorakhpur
SEPTEMBER 2014-2015
1
2. CERTIFICATE
Certified that RAJNEESH KUMAR SINGH (enrollment no-1252540079) has presented
a seminar on “MICRO TURBINE” in partial fulfilment for the award of degree of
Bachelor of technology in Mechanical engineering at Buddha Institute of Technology,
Gautam Buddha Technical University, Lucknow, U.P. under our supervision and guidance
during the academic session 2014-2015
Guide Seminar Coordinator Head of Department
(Mr Rahul Srivastava) (Mr Ajay Yadav) (Mr Shayam Bihari Lal)
2
3. ACKNOWLEDGEMENT
We place on record and warmly acknowledge the continuous encouragement, invaluable
supervision, timely suggestions and inspired guidance offered by our guide Mr Rahul
Srivastava, Department of Mechanical Engineering, BUDDHA INSTITUTE OF
TECHNOLOGY GORAKHPUR this report to a successful completion. We consider
ourselves fortunate to get a chance to work under the guidance of such a dynamic
personality
Last but not the we thank our parents and the Almighty whose blessings are always there
with us least. I am also thankful to Mr Shyam Bihari Lal, HOD of Mechanical
Engineering BUDDHA INSTITUTE OF TECHNOLOGY, GIDA GORAKHPUR for his
constant support and encouragement.
DATE Rajneesh Kumar Singh
3
M.E IIIrd
1252540079
4. ABSTRACT
Micro turbines are a relatively new type of combustion turbine that produces both heat and
electricity on a small scale. Micro turbines offer an efficient and clean solution to direct
mechanical drive markets such as compression and air-conditioning. This report focuses on
the design and development of a micro turbine driven by compressed nitrogen gas. The
available literature regarding the design aspects of micro turbine were reviewed in detail.
Gas turbine cycle and operation of micro turbine was studied and reported. The turbine
blades and nozzles were designed with the help of Gambit software using a given set of
cylindrical coordinates. The turbine has a radial inlet and axial outlet. A proper meshing
scheme was used to mesh the turbine and nozzle assembly. CFD analysis was carried out
by fluent software to get the velocity vectors using a set of suitable inputs.
Keywords: Gas turbine, turbine blade, nozzle, nitrogen
4
5. Contents
Contents 5
List of Figures and Tables 7
Chapter 1: Literature Review 8
Chapter 2: Gas Turbine 9
2.1 Gas Turbine 9
2.2 Types of Gas Turbine 9
2.3 Gas Turbine Cycle 9
2.4 Advantages of Gas Turbine 10
Chapter 3: Micro Turbine 12
3.1 Micro Turbine 12
3.2 Types of Micro turbine 13
3.3 Functional 14
3.4 Productive 14
3.5 Characteristics of Micro turbine 15
3.6 TECHNOLOGY DISCRIPTION OF MICROTURBINES 15
3.6.1 Basic Processes 15
3.6.2 Thermodynamic Heat Cycle 16
3.6.3 Basic Components 16
3.7 Design Characteristics of micro turbines 21
5
7. List of Figures
Fig 1.1 Idealized Brayton Cycle 10
Fig 2.1 Capstone turbine 12
Fig 2.2 Basic parts of micro turbine 18
Fig 2.3 Micro turbine based combined heat and power system 20
Fig2.4 Micro turbine Construction 20
7
8. Chapter 1
8
LITERATURE REVIEW:-
Micro turbine is one of the important components in a micro gas turbine engine. Micro gas
Turbine engine is a promising solution to provide high-density power source for micro
systems. A micro gas turbine engine consists of a radial inflow turbine, a centrifugal
compressor and a combustor. This thesis mainly deals with the design aspects of a micro
turbine. Various journals have been published on designing of various types of micro
turbines Exhaustive study has been done on these papers and the major points have been
highlighted here.
Micro turbines are a relatively new distributed generation technology being used for
stationary energy generation applications. They are a type of combustion turbine that
produces both heat and electricity on a relatively small scale. Micro turbines offer several
potential advantages compared to other technologies for small-scale power generation,
including: a small number of moving parts, compact size, lightweight, greater efficiency,
lower emissions, lower electricity costs, and opportunities to utilize waste fuels. Waste
heat recovery can also be used with these systems to achieve efficiencies greater than 80%.
Because of their small size, relatively low capital costs, expected low operations and
maintenance costs, and automatic electronic control, micro turbines are expected to capture
a significant share of the distributed generation market. In addition, micro turbines offer an
efficient and clean solution to direct mechanical drive markets such as compression and
air-conditioning.
9. Chapter 2
GAS TURBINE
9
2.1 Gas Turbine
A gas turbine is a rotating engine that extracts energy from a flow of combustion gases that
result from the ignition of compressed air and a fuel (either a gas or liquid, most commonly
natural gas). It has an upstream compressor module coupled to a downstream turbine
module, and a combustion chamber(s) module (with igniter[s]) in between.
Energy is added to the gas stream in the combustor, where air is mixed with fuel and
ignited. Combustion increases the temperature, velocity, and volume of the gas flow. This
is directed through a nozzle over the turbine’s blades, spinning the turbine and powering
the compressor. Energy is extracted in the form of shaft power, compressed air, and thrust,
in any combination, and used to power aircraft, trains, ships, generators, and even tanks.
2.2 Types of Gas Turbine
There are different types of gas turbines. Some of them are named below:
Aero derivatives and jet engines
Amateur gas turbines
Industrial gas turbines for electrical generation
Radial gas turbines
Scale jet engines
Micro turbines
The main focus of this paper is the written aspects of micro turbine.
2.3 Gas Turbine Cycle
The simplest gas turbine follows the Brayton cycle (Figure 1.1). In a closed cycle (i.e., the
working fluid is not released to the atmosphere), air is compressed isentropically,
combustion occurs at constant pressure, and expansion over the turbine occurs
isentropically back to the starting pressure. As with all heat engine cycles, higher
combustion temperature (the common industry reference is turbine inlet temperature)
means greater efficiency. The limiting factor is the ability of the steel, ceramic, or other
materials that make up the engine to withstand heat and pressure. Considerable
design/manufacturing engineering goes into keeping the turbine parts cool. Most turbines
also try to recover exhaust heat, which otherwise is wasted energy. Recuperators are heat
exchangers that pass exhaust heat to the compressed air, prior to combustion. Combined-cycle
designs pass waste heat to steam turbine systems, and combined heat and power (i.e.,
cogeneration) uses waste heat for hot water production. Mechanically, gas turbines can be
considerably less complex than internal combustion piston engines. Simple turbines might
10. have one moving part: the shaft/compressor/ turbine/alternator-rotor assembly, not
counting the fuel system. More sophisticated turbines may have multiple shafts (spools),
hundreds of turbine blades, movable stator blades, and a vast system of complex piping,
combustors, and heat exchangers.
Figure 1.1- Idealized Brayton Cycle
The largest gas turbines operate at 3000 (50 hertz [Hz], European and Asian power supply)
or 3600 (60 Hz, U.S. power supply) RPM to match the AC power grid. They require their
own building and several more to house support and auxiliary equipment, such as cooling
towers. Smaller turbines, with fewer compressor/turbine stages, spin faster. Jet engines
operate around 10,000 RPM and micro turbines around 100,000 RPM. Thrust bearings and
journal bearings are a critical part of the design. Traditionally, they have been
hydrodynamic oil bearings or oil cooled ball bearings.
10
Features:
Gas-turbine is used in aircraft propulsion and electric power generation.
High thermal efficiencies up to 44%.
Suitable for combined cycles (with steam power plant)
High power to weight ratio, high reliability, long life
Fast start up time, about 2 min, compared to 4 hr. for steam-propulsion systems
High back work ratio (ratio of compressor work to the turbine work), up to 50%,
Compared to few percent in steam power plants.
11. 11
2.4 Advantages of Gas Turbine
Very high power-to-weight ratio, compared to reciprocating engines.
Smaller than most reciprocating engines of the same power rating.
Moves in one direction only, with far less vibration than a reciprocating engine.
Fewer moving parts than reciprocating engines.
Low operating pressures.
High operation speeds.
Low lubricating oil cost and consumption.
12. Chapter 3
MICRO TURBINE
12
3.1 Micro turbine
Micro turbine Overview
Commercially Available- Yes (Limited)
Size Range- 25-500 kW
Fuel- Natural gas, hydrogen, propane, diesel
Efficiency- 20-30% (Recuperated)
Environmental- Low (<9-50 ppm) NOx
Other Features- Cogeneration (50-80°C water)
Commercial Status- Small volume production,
Commercial prototypes now
Fig 2.1 Capstone turbine
Micro turbines are small combustion turbines with outputs of 25 kW to 500 kW. They
evolved from automotive and truck turbochargers, auxiliary power units (APUs) for
13. airplanes, and small jet engines. Micro turbines are a relatively new distributed generation
technology being used for stationary energy generation applications. They are a type of
combustion turbine that produces both heat and electricity on a relatively small scale.
A micro gas turbine engine consists of a radial inflow turbine, a centrifugal compressor
and a combustor. The micro turbine is one of the critical components in a micro gas turbine
engine, since it is used for outputting power as well as for rotating the compressor. Micro
turbines are becoming widespread for distributed power and combined heat and power
applications. They are one of the most promising technologies for powering hybrid electric
vehicles. They range from hand held units producing less than a kilowatt, to commercial
sized systems that produce tens or hundreds of kilowatts.
Part of their success is due to advances in electronics, which allows unattended operation
and interfacing with the commercial power grid. Electronic power switching technology
eliminates the need for the generator to be synchronized with the power grid. This allows
the generator to be integrated with the turbine shaft, and to double as the starter motor.
They accept most commercial fuels, such as gasoline, natural gas, propane, diesel, and
kerosene as well as renewable fuels such as E85, biodiesel and biogas.
Most micro turbines are comprised of a compressor, combustor, turbine, alternator,
recuperator (a device that captures waste heat to improve the efficiency of the compressor
stage), and generator.
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3.2 Types of Micro turbine
Micro turbines are classified by the physical arrangement of the component parts: single
shaft or two-shaft, simple cycle, or recuperated, inter-cooled, and reheat. The machines
generally rotate over 40,000 revolutions per minute. The bearing selection—oil or air—is
dependent on usage. A single shaft micro turbine with high rotating speeds of 90,000 to
120,000 revolutions per minute is the more common design, as it is simpler and less
expensive to build. Conversely, the split shaft is necessary for machine drive applications,
which does not require an inverter to change the frequency of the AC power.
Microturbine generators can also be divided into two general classes:
Unrecuperated (or simple cycle) micro turbines— In a simple cycle, or
unrecuperated, turbine, compressed air is mixed with fuel and burned under
constant pressure conditions. The resulting hot gas is allowed to expand through a
turbine to perform work. Simple cycle micro turbines have lower efficiencies at
around 15%, but also lower capital costs, higher reliability, and more heat available
for cogeneration applications than recuperated units.
14. Recuperated micro turbines—Recuperated units use a sheet-metal heat
exchanger that recovers some of the heat from an exhaust stream and transfers it to
the incoming air stream, boosting the temperature of the air stream supplied to the
combustor. Further exhaust heat recovery can be used in a cogeneration
configuration. The figures below illustrate a recuperated micro turbine system. The
fuel-energy-to-electrical-conversion efficiencies are in the range of 20 to 30%. In
addition, recuperated units can produce 30 to 40% fuel savings from preheating.
Cogeneration is an option in many cases as a micro turbine is located at the point-of-
power utilization. The combined thermal electrical efficiency of micro turbines
in such cogeneration applications can reach as high as 85% depending on the heat
process requirements.
Micro turbine Efficiency:
Configuration Efficiency
Unrecuperated- 15%
Recuperated- 20-30%
With Heat Recovery- Up to 85%
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3.3 Functional:
Provides better power reliability and quality, especially for those in areas where
brownouts, surges, etc. are common or utility power is less dependable
Provides power to remote applications where traditional transmission and
distribution lines are not an option such as construction sites and offshore facilities
Can be an alternative to diesel generators for on-site power for mission critical
functions (e.g., communications centres )
Possesses combined heat and power capabilities
Reduces upstream overload of transmission lines
Optimizes utilization of existing grid assets—including potential to free up
transmission assets for increased wheeling capacity
Improves grid reliability
Facilitates faster permitting than transmission line upgrades
Can be located on sites with space limitations for the production of power
3.4 Productive:
Provides high-quality power for sensitive applications
15. Responds faster to new power demands—as capacity additions can be made more
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quickly
Facilitates less capital tied up in unproductive assets—as the modular nature of
micro turbines means capacity additions and reductions can be made in small
increments, closely matched with demand, instead of constructing central power
plants sized to meet estimated future (rather than current) demand
Stand-by power decreases downtime, enabling employees to resume working
Produces less noise than reciprocating engines
3.5 Characteristics of Micro turbine
Some of the primary characteristics for micro turbines include:
Distributed generation—stand-alone, on-site applications remote from power
grids
Quality power and reliability—reduced frequency variations, voltage
transients, surges, dips, or other disruptions
Stand-by power—used in the event of an outage, as a back-up to the electric
grid
Peak shaving—the use of micro turbines during times when electric use and
demand charges are high
Boost power—boost localized generation capacity and on more remote grids
Low-cost energy—the use of micro turbines as base load or primary power that
is less expensive to produce locally than it is to purchase from the electric utility
Combined heat and power (cogeneration)—increases the efficiency of
on-site power generation by using the waste heat for existing thermal process.
3.6 TECHNOLOGY DISCRIPTION OF MICROTURBINES
3.6.1 Basic Processes:
Micro turbines are small gas turbines, most of which feature an internal heat exchanger
called a recuperator. In a micro turbine, a radial flow (centrifugal) compressor
compresses the inlet air that is then preheated in the recuperator using heat from the
turbine exhaust. Next, the heated air from the recuperator mixes with fuel in the
combustor and hot combustion gas expands through the expansion and power turbines.
The expansion turbine turns the compressor and, in single shaft models, turns the
generator as well. Two-shaft models use the compressor drive turbine’s exhaust to power
a second turbine that drives the generator. Finally, the recuperator uses the exhaust of the
power turbine to preheat the air from the compressor. Single-shaft models generally
operate at speeds over 60,000 revolutions per minute (rpm) and generate electrical power
16. of high frequency, and of variable frequency (alternating current --AC). This power is
rectified to direct current (DC) and then inverted to 60 hertz (Hz) for U.S. commercial
use. In the two-shaft version, the power turbine connects via a gearbox to a generator that
produces power at 60 Hz. Some manufacturers offer units producing 50 Hz for use in
countries where 50 Hz is standard, such as in Europe and parts of Asia.
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3.6.2 Thermodynamic Heat Cycle
In principle, micro turbines and larger gas turbines operate on the same thermodynamic
heat cycle, the Brayton cycle. In this cycle, atmospheric air is compressed, heated at
constant Pressure, and then expanded, with the excess power produced by the expander
(also called the turbine) consumed by the compressor used to generate electricity. The
power produced by an expansion turbine and consumed by a compressor is proportional to
the absolute temperature of the gas passing through those devices. Higher expander inlet
temperature and pressure ratios result in higher efficiency and specific power. Higher
pressure ratios increase efficiency and specific power until an optimum pressure ratio is
achieved, beyond which efficiency and specific power decrease. The optimum pressure
ratio is considerably lower when a recuperator is used. Consequently, for good power and
efficiency, it is advantageous to operate the expansion turbine at the highest practical inlet
temperature consistent with economic turbine blade materials and to operate the
compressor with inlet air at the lowest temperature possible. The general trend in gas
turbine advancement has been toward a combination of higher temperatures and pressures.
However, micro turbine inlet temperatures are generally limited to 1750°F or below to
enable the use of relatively inexpensive materials for the turbine wheel and recuperator.
For recuperated turbines, the optimum pressure ratio for best efficiency is usually less than
4:1.
3.6.3 Basic Components
Components of Micro turbine:
I. Turbo-Compressor Package:-The basic components of a micro
turbine are the compressor, turbine generator, and recuperator Figure 2.2 the
heart of the micro turbine is the compressor-turbine package, which is
commonly mounted on a single shaft along with the electric generator. Two
bearings support the single shaft. The single moving part of the one-shaft
design has the potential for reducing maintenance needs and enhancing
overall reliability. There are also two-shaft versions, in which the turbine on
the first shaft directly drives the compressor while a power turbine on the
17. second shaft drives a gearbox and conventional electrical generator
producing 60 Hz power. The two shaft design features more moving parts
but does not require complicated power electronics to convert high
frequency AC power output to 60 Hz. Moderate to large-size gas turbines
use multi-stage axial flow turbines and compressors, in which the gas flows
along the axis of the shaft and is compressed and expanded in multiple
stages. However, micro turbine turbo machinery is based on single-stage
radial flow compressor and turbines. Rotary vane and scroll compression
are the most commonly used technology in the micro turbine industry.
Second generation gas compressor technologies are in development or
being introduced. That may reduce costs and target on-board application
Rotary vane compression technology offers a wide range of gaseous fuel
flexibility Parasitic loads vary based on type of gas and inlet pressures
available, general rule 4 to 6% for natural gas and 10 to 15% for bio gas.
II. Generator: - The micro turbine produces electrical power either via a
high-speed generator turning on the single turbo-compressor shaft or with a
separate power turbine driving a gearbox and conventional 3,600 rpm
generator. The high-speed generator of the single-shaft design employs a
permanent magnet (typically Samarium-Cobalt) alternator, and requires that
the high frequency AC output (about 1,600 Hz for a 30 kW machine) be
converted to 60 Hz for general use. This power conditioning involves
rectifying the high frequency AC to DC, and then inverting the DC to 60 Hz
AC. Power conversion comes with an efficiency penalty (approximately
five percent).To start-up a single shaft design, the generator acts as a motor
turning the turbo-compressor shaft until sufficient rpm is reached to start the
combustor. Full start-up requires several minutes. If the system is operating
independent of the grid (black starting), a power storage unit (typically a
battery UPS) is used to power the generator for start-up.
III. Recuperators:- Recuperators are heat exchangers that use the hot
turbine exhaust gas (typically around 1,200ºF) to preheat the compressed air
(typically around 300ºF) going into the combustor, thereby reducing the fuel
needed to heat the compressed air to turbine inlet temperature. Depending
on micro turbine operating parameters, recuperators can more than double
machine efficiency. However, since there is increased pressure drop in both
the compressed air and turbine exhaust sides of the recuperator, power
output typically declines 10 to 15% from that attainable without the
recuperator. Recuperators also lower the temperature of the micro turbine
exhaust, reducing the micro turbine’s effectiveness in CHP applications.
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18. IV. Air bearings:-They allow the turbine to spin on a thin layer of air, so
friction is low and rpm is high. No OIL or oil pump is needed. Air bearings
offer simplicity of operation without the cost, reliability concerns,
maintenance requirements, or power drain of an oil supply and filtering
system. Concern does exist for the reliability of air bearings under
numerous and repeated starts due to metal on metal friction during start up,
shutdown, and load changes. Reliability depends largely on individual
manufacturers' quality control methodology more than on design
engineering, and will only be proven after significant experience with
substantial numbers of units with long numbers of operating hours and
on/off cycles.
V. Power Electronics-The high frequency AC is rectified to DC, inverted
back to 60 or 50 Hz AC, and then filtered to reduce harmonic distortion...
To allow for transients and voltage spikes, power electronics designs are
generally able to handle seven times the nominal voltage. Most micro
turbine power electronics are generating three phase electricity. Electronic
components also direct all of the operating and start up functions.
Fig 2.2 Basic parts of micro turbine
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19. Micro turbines are very small gas turbines (30 to 400 kilowatts [kW]) that usually have an
internal heat-recovery heat exchanger (called a recuperator) to improve electric efficiency.
In typical micro turbines, the cycle is similar to that of a conventional gas turbine. It
consists of the following processes:
● Inlet air is compressed in a radial (centrifugal) compressor, then
● Preheated in the recuperator using heat from the turbine exhaust.
● Heated air from the recuperator is mixed with fuel in the combustor and burned.
The hot combustion gas is then expanded in one or more turbine sections, which produces
rotating mechanical power to drive the compressor and the electric generator. The
recuperator efficiency is the key to whether a particular micro turbine is economically
viable. By comparison, in a conventional gas turbine, the gas flow path is as follows:
compressed air from the compressor (more air mass can be ―introduced‖ by inter-cooling)
is burned with fuel.
Gaseous products expand through the turbine section (where more power can be extracted
by reheating the gaseous products). Exhaust gases can provide waste heat recovery or
cogeneration potential, as those gases may produce steam to drive a steam turbine, may be
led into a greenhouse system, or may optimize thermal efficiency by some other means.
Without waste heat recovery or cogeneration of some sort, a gas turbine is said to operate
in ―simple cycle‖ mode. With the addition of a boiler (to get steam from waste heat
recovery) and a steam turbine, the gas turbine package is said to operate as a ―combined
cycle.‖ However, most micro turbines, to be financially viable, have a recuperator (to
recover waste heat). This is not quite a simple cycle, but the micro turbine can be said to
operate ―solo‖ in power-only applications. Frequently, micro turbines are used to extract
heat as a product. This then would be called combined heat and power (CHP) applications.
In single-shaft micro turbines, a single expansion turbine turns both the compressor and the
generator. Two-shaft models use one turbine to drive the compressor and a second turbine
to drive the generator, with exhaust from the compressor turbine powering the generator
turbine. The power turbine’s exhaust is then used in the recuperator to preheat the air from
the compressor.
The basic components of a micro turbine are the compressor, turbine, generator, and
recuperator (Figure 1.2). The heart of the micro turbine is the compressor-turbine package,
which is most commonly mounted on a single shaft along with the electric generator. The
single shaft is supported by two (or more) high-speed bearings. Because single-shaft
turbines have only one moving shaft, they have the potential for lower maintenance and
higher reliability than turbines with two or more shafts. There are also two-shaft versions
of the micro turbine, in which the turbine on the first shaft only drives the compressor
while a second power turbine on a second shaft drives a gearbox and conventional electric
generator producing 60 or 50 Hz of power. Moderate- to large-sized gas turbines use
multistage axial flow compressors and turbines, in which the gas flows parallel to the axis
19
20. of the shaft and then is compressed and expanded in multiple stages. Most current micro
turbines are based on single-stage radial flow compressors and either single- or double-stage
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turbines.
Fig. 2.3 Micro turbine based combined heat and power system
Fig2.4 Micro turbine Construction
21. 3.7 Design Characteristics of micro turbines
Thermal output: Micro turbines produce thermal output at temperatures in the 400 to
600°F range, suitable for supplying a variety of building thermal needs.
Fuel flexibility: - Micro turbines can operate using a number of different fuels:
Sour gases (high sulfur, low Btu content), and liquid fuels such
As gasoline, kerosene, natural gas and diesel fuel/heating OIL.
Life: - Design life is estimated to be in the 40,000 to 80,000 hour range.
Size range: - Micro turbines available and under development are sized
From 25 to 350 KW
Emissions: - Low inlet temperatures and high fuel-to-air ratios result in NOx
Emissions of less than 10 parts per million (ppm) when
Running on natural gas
Modularity: - Units may be connected in parallel to serve larger loads and
Provide power reliability
Dimensions: - About 12 cubic feet.
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3.8 Advantages
Micro turbine systems have many advantages over reciprocating engine generators, such as
higher power density (with respect to footprint and weight), extremely low emissions and
few, or just one, moving part. Those designed with foil bearings and air-cooling operates
without oil, coolants or other hazardous materials. Micro turbines also have the advantage
of having the majority of their waste heat contained in their relatively high temperature
exhaust, whereas the waste heat of reciprocating engines is split between its exhaust and
cooling system. However, reciprocating engine generators are quicker to respond to
changes in output power requirement and are usually slightly more efficient, although the
efficiency of micro turbines is increasing. Micro turbines also lose more efficiency at low
power levels than reciprocating engines.
22. Micro turbines offer several potential advantages compared to other technologies for
small-scale power generation, including: a small number of moving parts, compact size,
lightweight, greater efficiency, lower emissions, lower electricity costs, and opportunities
to utilize waste fuels.
Waste heat recovery can also be used with these systems to achieve efficiencies greater
than 80%. Because of their small size, relatively low capital costs, expected low operations
and
Maintenance costs, and automatic electronic control, micro turbines are expected to
capture a significant share of the distributed generation market. In addition, micro turbines
offer an efficient and clean solution to direct mechanical drive markets such as
compression and air conditioning.
Micro turbines offer many potential advantages for distributed power generation. Selected
strengths and weaknesses of micro turbine technology are listed in the following table from
the California Distributed Energy Resources Guide on Micro turbines.
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Micro turbines:-
Strengths Weaknesses
Small number of moving parts, Low fuel to electricity efficiencies
Compact size Loss of power output and efficiency with higher ambient
temperatures and elevation
Lightweight
Good efficiencies in cogeneration
Low emissions
Can utilize waste fuels
Long maintenance intervals
No vibrations
Less noise than reciprocating engines
Strengthens energy security
3.9 Economics of Micro turbines
Micro turbine capital costs range from $700-$1,100/kW. These costs include all hardware,
associated manuals, software, and initial training. Adding heat recovery increases the cost
by $75-$350/kW. Installation costs vary significantly by location but generally add 30-
50% to the total installed cost.
Micro turbine manufacturers are targeting a future cost below $650/kW. This appears to be
feasible if the market expands and sales volumes increase. With fewer moving parts, micro
turbine vendors hope the units can provide higher reliability than conventional
23. reciprocating generating technologies. Manufacturers expect that initial units will require
more unexpected visits, but as the products mature, a once-a-year maintenance schedule
should suffice. Most manufacturers are targeting maintenance intervals of 5,000-8,000
hours. Maintenance costs for micro turbine units are still based on forecasts with minimal
real-life situations. Estimates range from $0.005-$0.016 per kWh, which would be
comparable to that for small reciprocating engine systems.
Micro turbine Cost:
Capital Cost- $700-$1,100/kW
O&M Cost- $0.005-0.016/kW
Maintenance Interval- 5,000-8,000 hrs.
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3.10 Applications
Micro turbines can be used for stand-by power, power quality and reliability, peak shaving,
and cogeneration applications. In addition, because micro turbines are being developed to
utilize a variety of fuels, they are being used for resource recovery and landfill gas
applications. Micro turbines are well suited for small commercial building establishments
such as: restaurants, hotels/motels, small offices, retail stores, and many others.
The variety of energy consumers that are already using micro turbines is large and growing
fast. For example:
A McDonald's restaurant in Chicago, Illinois, gets most of its electricity
from a natural-gas-powered micro turbine, cutting $1,500 off its total
monthly power bill. More
Landfill gas-fired micro turbines installed at the Jamacha Landfill in Spring
Valley, California supply power on-site and back to the grid.
A textile mill ensures continuous operation by getting its power from micro
turbines.
The development of micro turbine technology for transportation applications is also in
progress. Automotive companies are interested in micro turbines as a lightweight and
efficient fossil- fuel-based energy source for hybrid electric vehicles, especially buses.
Other ongoing developments to improve micro turbine design, lower costs, and increase
performance in order to produce a competitive distributed generation product include heat
recovery/cogeneration, fuel flexibility, and hybrid systems (e.g., fuel cell/micro turbine,
flywheel/micro turbine).
24. Chapter 4
CONCLUSION
The drawbacks of centralized power generation and shortage of power leading to concept
of Distributed generation (DG).DG tends to several advantages and concept of DG is more
feasible. Micro turbine is the application of DG .The history of IC engine. Shows several
year research works for today’s better result. Therefore micro turbine is tomorrow’s world.
Micro turbine can use low grade of fuel very effectively like waste gases, sour gases etc.
Thus micro turbine gives chance of low fuel cost and less emission. The dimensions of
micro turbine comparatively small by which it can be installed at field where power is
consumed. It has few efficiency problems. Due to chemical recuperation the thermal
efficiency increases sharply. Micro turbine is also effective in CHP operation .It is having
problem of Starting time and that’s why it fails as standby power generator compared to
IC engines. In India the micro turbine is quite useful. The power shortage effect can be
solved using micro turbine, using fuels like biogas, etc. But in India the technology is still
underdevelopment so the present seminar is an honest attempt to introduce micro turbine
technology in India for solving the problem of power generation in future.
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25. REFERENCES
1] Experimental and simulation analysis of micro turbines- by S. M. Flockhart and R. S.
Dhariwal
2] A micro turbine device with enhanced micro air bearings-by X. C. Shan, Q. D. Zhang ,
Y. F. Sun and R. Maed
3] http://www.wbdg.org/resources/microturbines.php{
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4] Engineringcorner.blogspot.in
5] Experimental simulation on the integration of solid oxide fuel cell and micro-turbine
generation system-by Wei-Hsiang Lai , Chi-An Hsiao , Chien-Hsiung Lee , Yau-Pin
Chyoub, Yu-Ching Tsai
6] Analytical and Experimental Studies on Turbo expander‖ - Ghosh, P and Sarangi, IIT
Kharagpur (2002)