1. The first oxygen sensor developed by Bosch was installed in a Volvo in 1976 and helped emissions regulations.
2. Bosch now produces 33 million oxygen sensors per year to help vehicles meet increasingly strict emissions standards by precisely regulating air-fuel ratios.
3. Oxygen sensors use solid electrolyte ceramic and platinum electrodes to detect oxygen levels in exhaust and send signals to adjust engine management for minimum emissions.
Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid-reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF). The DEF sets off a chemical reaction that converts nitrogen oxides into nitrogen, water and tiny amounts of carbon dioxide (CO2), natural components of the air we breathe, which is then expelled through the vehicle tailpipe.
SCR technology is designed to permit nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The chemical reaction is known as "reduction" where the DEF is the reducing agent that reacts with NOx to convert the pollutants into nitrogen, water and tiny amounts of CO2. The DEF can be rapidly broken down to produce the oxidizing ammonia in the exhaust stream. SCR technology alone can achieve NOx reductions up to 90 percent
The document discusses continuous emission monitoring systems (CEMS). It describes CEMS as equipment used to continuously determine the concentration of gas or particulate matter emissions from stationary sources like smokestacks. It outlines different types of CEMS including extractive systems that withdraw gas samples and in-situ systems that perform measurements inside the stack. Common CEMS technologies are also summarized, such as extractive, dilution, and in-situ systems. Key aspects of CEMS calibration and its importance are highlighted.
Cryogenic insulations are needed to minimize heat transfer into storage tanks and transfer lines for cryogenic liquids. There are several types of insulation classified based on cost, weight, ease of application, and thermal conductivity. Expanded foams, gas-filled powders, and fiber materials provide insulation through a cellular or porous structure that reduces conduction and convection. Vacuum, evacuated, and opacified powder insulations further reduce conduction and radiation by removing gases. Multilayer insulation uses alternating conductive and non-conductive layers under vacuum to maximize reflection of radiation for optimal heat transfer prevention. The type used depends on the insulation needs and limitations of the specific cryogenic system.
The vapor compression refrigeration cycle is commonly used to transfer heat from a low temperature medium to a high temperature medium. It involves four main processes: (1) compression of a refrigerant vapor, (2) heat rejection in a condenser, (3) expansion of the refrigerant through a throttle valve, and (4) heat absorption in an evaporator. The coefficient of performance (COP) is used to measure the efficiency of refrigerators and heat pumps. Actual vapor compression cycles are less efficient than the ideal Carnot cycle due to irreversibilities.
The document describes the process of calculating the cooling load of a room using the Cooling Load Temperature Difference (CLTD) Method. It involves calculating the transmission load through the walls and roof by determining their areas, U-values, and CLTD corrections. The solar heat gain through windows is also calculated. Internal loads from lighting, equipment, and occupancy are estimated. The total cooling load is calculated by summing the transmission load, solar gain, internal load, and occupancy load, which comes out to be 9170.97 watts or around 2.5 to 3 tons for air conditioning unit selection.
This document summarizes 17 major fire losses that occurred at various Indian power plants between 1988-2002. It provides brief descriptions of each plant, location and cause of fire, estimated losses, and recommendations to prevent future fires. Some common causes included electrical faults, coal spontaneous ignition, and oil leaks igniting on hot surfaces. Recommendations focused on improved maintenance, monitoring, insulation, detection systems and fire suppression.
A boiler provides a means for combustion heat to be transferred to water and turned into steam or hot water. It has three main systems - the feed water system, steam system, and fuel system. Heat is transferred from the burning fuel via radiation, convection and conduction to heat the water inside the boiler. Boilers can be evaluated to determine their efficiency and identify areas for improvement, such as reducing stack gas temperature, preheating feed water, improving combustion, and reducing heat losses.
Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid-reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF). The DEF sets off a chemical reaction that converts nitrogen oxides into nitrogen, water and tiny amounts of carbon dioxide (CO2), natural components of the air we breathe, which is then expelled through the vehicle tailpipe.
SCR technology is designed to permit nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The chemical reaction is known as "reduction" where the DEF is the reducing agent that reacts with NOx to convert the pollutants into nitrogen, water and tiny amounts of CO2. The DEF can be rapidly broken down to produce the oxidizing ammonia in the exhaust stream. SCR technology alone can achieve NOx reductions up to 90 percent
The document discusses continuous emission monitoring systems (CEMS). It describes CEMS as equipment used to continuously determine the concentration of gas or particulate matter emissions from stationary sources like smokestacks. It outlines different types of CEMS including extractive systems that withdraw gas samples and in-situ systems that perform measurements inside the stack. Common CEMS technologies are also summarized, such as extractive, dilution, and in-situ systems. Key aspects of CEMS calibration and its importance are highlighted.
Cryogenic insulations are needed to minimize heat transfer into storage tanks and transfer lines for cryogenic liquids. There are several types of insulation classified based on cost, weight, ease of application, and thermal conductivity. Expanded foams, gas-filled powders, and fiber materials provide insulation through a cellular or porous structure that reduces conduction and convection. Vacuum, evacuated, and opacified powder insulations further reduce conduction and radiation by removing gases. Multilayer insulation uses alternating conductive and non-conductive layers under vacuum to maximize reflection of radiation for optimal heat transfer prevention. The type used depends on the insulation needs and limitations of the specific cryogenic system.
The vapor compression refrigeration cycle is commonly used to transfer heat from a low temperature medium to a high temperature medium. It involves four main processes: (1) compression of a refrigerant vapor, (2) heat rejection in a condenser, (3) expansion of the refrigerant through a throttle valve, and (4) heat absorption in an evaporator. The coefficient of performance (COP) is used to measure the efficiency of refrigerators and heat pumps. Actual vapor compression cycles are less efficient than the ideal Carnot cycle due to irreversibilities.
The document describes the process of calculating the cooling load of a room using the Cooling Load Temperature Difference (CLTD) Method. It involves calculating the transmission load through the walls and roof by determining their areas, U-values, and CLTD corrections. The solar heat gain through windows is also calculated. Internal loads from lighting, equipment, and occupancy are estimated. The total cooling load is calculated by summing the transmission load, solar gain, internal load, and occupancy load, which comes out to be 9170.97 watts or around 2.5 to 3 tons for air conditioning unit selection.
This document summarizes 17 major fire losses that occurred at various Indian power plants between 1988-2002. It provides brief descriptions of each plant, location and cause of fire, estimated losses, and recommendations to prevent future fires. Some common causes included electrical faults, coal spontaneous ignition, and oil leaks igniting on hot surfaces. Recommendations focused on improved maintenance, monitoring, insulation, detection systems and fire suppression.
A boiler provides a means for combustion heat to be transferred to water and turned into steam or hot water. It has three main systems - the feed water system, steam system, and fuel system. Heat is transferred from the burning fuel via radiation, convection and conduction to heat the water inside the boiler. Boilers can be evaluated to determine their efficiency and identify areas for improvement, such as reducing stack gas temperature, preheating feed water, improving combustion, and reducing heat losses.
This document provides an overview of a training session on energy equipment refrigeration and air conditioning systems. It discusses types of refrigeration including vapor compression and vapor absorption. It also covers assessing the performance of refrigeration and air conditioning systems, such as measuring tons of refrigeration and coefficient of performance. Finally, it lists several energy efficiency opportunities for refrigeration and AC systems, such as optimizing heat exchange, multi-staging systems, and capacity control of compressors.
This document provides information on Carlyle 06D, 06E, and 06CC compressor models including:
- Model number significance explaining the codes and identifiers
- Nameplate and serial number significance
- Warranty and service policies
- Startup, troubleshooting, and service procedures
- Physical and electrical specifications
- Component information and replacement part numbers
- Service worksheets for documenting repairs
It serves as a reference guide for technicians servicing Carlyle semi-hermetic compressors.
The document discusses the key properties and standards for diesel fuel. It explains how diesel fuel is produced from petroleum and the various hydrocarbon components. It then covers the ASTM D975 specification for diesel fuel, outlining important properties like cetane number, viscosity, sulfur content, and lubricity. It discusses how these properties can impact engine performance and emissions. Finally, it briefly mentions recent changes to the diesel fuel specification and resources for further information.
emission measuring equipment for CO2,CO & HCvinod Sangode
The Orsat gas analyzer uses a series of absorption bulbs containing different solutions to measure the concentrations of CO2, O2, CO, and nitrogen in flue gas samples. The flue gas is first drawn into a water-filled burette and its initial volume is recorded. It is then passed through different absorption bulbs where specific gases are absorbed. The volume of gas remaining after each absorption step provides the volume of the gas absorbed, allowing calculation of its concentration in the original sample.
This document discusses cooling load estimation for a multi-story office building. It presents a thesis submitted for the degree of Master of Technology in Mechanical Engineering, with a focus on thermal engineering. The thesis analyzes cooling load calculation using the CLTD method for different climate conditions. It discusses factors that impact human comfort, and methods to calculate various internal and external heat gains that contribute to the total cooling load of a building. These include heat gains from occupants, lighting, equipment, infiltration, ventilation and through opaque and glass surfaces. The objective is to accurately size air conditioning equipment by determining the peak cooling load.
Higher College of Technology
This document presents a cooling load estimation report for a mechanical engineering classroom. It discusses the various factors that contribute to the sensible and latent heat loads in a space, including conduction through walls/roof, occupants, lights, appliances, and air infiltration. It then outlines the CLTD/SCL/CLF method for calculating the external and internal cooling loads, showing examples of calculating the roof load over several hours based on construction details.
This document discusses fire and gas detection systems. It begins by defining fire and gases, explaining that fire is a chain reaction between fuel and oxygen that produces heat, light and other byproducts. Gases disperse and mix rapidly. Detection systems are needed to monitor hazardous gas levels and provide early warning before hazards form. They protect people, infrastructure and the environment per safety laws and codes. Detection considers flammable, toxic and asphyxiant gas risks. The document then covers gas properties, ignition risks, limits of flammability, and detection technology types like infrared and catalytic sensors. It stresses the importance of instrument calibration and certification to ensure accurate measurements. Examples of industrial accidents caused by gas leaks are also provided.
VVER reactors are pressurized water reactors originally developed in the Soviet Union/Russia. The document discusses the history and evolution of VVER reactor designs from early Generation I and II models through current Generation III+ designs. It provides details on VVER-440, VVER-1000, VVER-1200 and planned VVER-1500 models, describing their key features, safety improvements over time, and global proliferation. Countries operating VVER reactors include Russia, Ukraine, Hungary, Finland, Bulgaria, Slovakia, Czech Republic, China, India, Iran and others.
Source: Honeywell
Gas detection basics
Gas detection sensing technology
Sensor location
SIL in gas detection
Calibration / maintenance
ATEX
www.ie-net.be/reg
www.regeltechnieken.org
Cryogenic Liquid Storage Containers and Componentsinoxindia123
Get to know Cryogenic Liquid Storage containers designed for storage and transportation by maintaining temperatures. Also, go through the basic components designed as well as guidance to take care cryogenic containers.
Thermophysical Properties of RefrigerentsAbu Bakar
This chapter provides thermophysical property data for various refrigerants. It includes pressure-enthalpy diagrams and tables of saturated liquid and vapor properties for each refrigerant. Data is presented for halocarbon, hydrocarbon, inorganic, and cryogenic refrigerants as well as some refrigerant blends. The properties conform to international standards where applicable. The data is intended to help engineers make preliminary comparisons between unfamiliar refrigerants.
The document discusses diesel emissions regulations and exhaust after-treatment technologies for modern diesel engines. It covers:
1) Changes in US emissions standards over time that have driven new technologies.
2) Key technologies developed to reduce emissions include advanced fuel injection systems, alternative fuels like biodiesel, and exhaust after-treatment devices.
3) Common exhaust after-treatment methods mentioned are diesel particulate filters, NOx adsorber catalysts, selective catalytic reduction using urea injection, and catalyzed diesel particulate filters.
introduction to premixed flame,its classification,laminar premixed flame,laminar premixed flame, structured of 1D premixed flame , various zones of premixed flame.
This document discusses the motivation behind designing and fabricating a micro gas turbine using an automotive turbocharger for distributed power generation in India. It outlines issues with India's current power scenario such as power shortage, unreliable supply, and lack of access for 350-400 million people. Distributed power generation using microturbines is presented as a solution to provide reliable off-grid power. The current project aims to develop a low-cost microturbine using a turbocharger to address India's power challenges and enable distributed power generation.
Innovative projects in the refrigeration and Air Conditioning sector UNEP OzonAction
This document summarizes presentations from a regional workshop on low-GWP and energy efficient HCFC replacement technologies in the refrigeration and air conditioning sector. It provides examples of projects from GTZ Proklima in Europe and Asia that demonstrate alternative refrigerant options to HCFCs. Case studies described include a Gree air conditioning unit in China that uses propane instead of HFC-410A, and Johnson Controls chillers that use ammonia or hydrocarbons in Europe with lower energy use and charges than previous HFC systems. The document outlines the objectives, innovations, conclusions and energy savings of these demonstration projects of low-charge ammonia and hydrocarbon refrigerant systems.
The document discusses selective catalytic reduction (SCR) which uses a catalyst to convert nitrogen oxides (NOx) in exhaust gas into nitrogen and water. SCR involves injecting an aqueous urea solution into the exhaust of a diesel engine. The urea then decomposes into ammonia, which reacts with NOx over an SCR catalyst. Common reducing agents for SCR include anhydrous ammonia, aqueous ammonia, and urea solution. Urea is preferred because it is non-toxic, easy to transport and dose, and can reduce NOx emissions by up to 90% while also reducing other emissions and improving fuel economy. The document concludes that SCR and other aftertreatment devices are required to meet increasingly
This document provides an overview of a training session on fans and blowers for energy efficiency. It discusses the key components of fans, how to assess fan performance and efficiency, and identifies various opportunities to improve energy efficiency, such as choosing the right fan size, reducing system resistance, maintaining fans properly, and controlling air flow through methods like variable speed drives.
Oil analysis involves sampling machine lubricants and analyzing them to monitor lubricant health, equipment health, and contamination levels. It can detect wear in components, coolant leakage, and filter effectiveness. Common tests analyze viscosity, water content, acidity, additives, and wear particles. Together these provide information on lubricant condition, equipment operation, and maintenance strategy effectiveness to optimize service intervals and avoid unexpected breakdowns.
Comparison of cycles and measurement of exhaust gases.pptxSAshwinDaniel
1. The document discusses various methods for measuring exhaust emissions from vehicles including carbon monoxide (CO), nitrogen oxides (NOx), oxygen/air-fuel ratio, smoke, and particulates.
2. It describes the construction and working principles of different analyzer instruments that use techniques like infrared absorption, chemiluminescence reactions, and electrochemical cells.
3. Emission control methods like thermal converters and catalytic converters are explained, along with their advantages and limitations in automotive applications. Recent developments in emission standards and control technologies are also summarized.
This document is a design lab report for an electronic circuit for a gas sensor array. It summarizes the introduction, working principles, and structure of gas sensors. It then describes the specific gas sensor used - the TGS2610 - and provides its specifications and dimensions. The experiment procedure explains the circuit components, diagram, and discussion of how the circuit detects LPG gas and could be extended for multiple sensors or interfaced with data acquisition software.
This document provides an overview of a training session on energy equipment refrigeration and air conditioning systems. It discusses types of refrigeration including vapor compression and vapor absorption. It also covers assessing the performance of refrigeration and air conditioning systems, such as measuring tons of refrigeration and coefficient of performance. Finally, it lists several energy efficiency opportunities for refrigeration and AC systems, such as optimizing heat exchange, multi-staging systems, and capacity control of compressors.
This document provides information on Carlyle 06D, 06E, and 06CC compressor models including:
- Model number significance explaining the codes and identifiers
- Nameplate and serial number significance
- Warranty and service policies
- Startup, troubleshooting, and service procedures
- Physical and electrical specifications
- Component information and replacement part numbers
- Service worksheets for documenting repairs
It serves as a reference guide for technicians servicing Carlyle semi-hermetic compressors.
The document discusses the key properties and standards for diesel fuel. It explains how diesel fuel is produced from petroleum and the various hydrocarbon components. It then covers the ASTM D975 specification for diesel fuel, outlining important properties like cetane number, viscosity, sulfur content, and lubricity. It discusses how these properties can impact engine performance and emissions. Finally, it briefly mentions recent changes to the diesel fuel specification and resources for further information.
emission measuring equipment for CO2,CO & HCvinod Sangode
The Orsat gas analyzer uses a series of absorption bulbs containing different solutions to measure the concentrations of CO2, O2, CO, and nitrogen in flue gas samples. The flue gas is first drawn into a water-filled burette and its initial volume is recorded. It is then passed through different absorption bulbs where specific gases are absorbed. The volume of gas remaining after each absorption step provides the volume of the gas absorbed, allowing calculation of its concentration in the original sample.
This document discusses cooling load estimation for a multi-story office building. It presents a thesis submitted for the degree of Master of Technology in Mechanical Engineering, with a focus on thermal engineering. The thesis analyzes cooling load calculation using the CLTD method for different climate conditions. It discusses factors that impact human comfort, and methods to calculate various internal and external heat gains that contribute to the total cooling load of a building. These include heat gains from occupants, lighting, equipment, infiltration, ventilation and through opaque and glass surfaces. The objective is to accurately size air conditioning equipment by determining the peak cooling load.
Higher College of Technology
This document presents a cooling load estimation report for a mechanical engineering classroom. It discusses the various factors that contribute to the sensible and latent heat loads in a space, including conduction through walls/roof, occupants, lights, appliances, and air infiltration. It then outlines the CLTD/SCL/CLF method for calculating the external and internal cooling loads, showing examples of calculating the roof load over several hours based on construction details.
This document discusses fire and gas detection systems. It begins by defining fire and gases, explaining that fire is a chain reaction between fuel and oxygen that produces heat, light and other byproducts. Gases disperse and mix rapidly. Detection systems are needed to monitor hazardous gas levels and provide early warning before hazards form. They protect people, infrastructure and the environment per safety laws and codes. Detection considers flammable, toxic and asphyxiant gas risks. The document then covers gas properties, ignition risks, limits of flammability, and detection technology types like infrared and catalytic sensors. It stresses the importance of instrument calibration and certification to ensure accurate measurements. Examples of industrial accidents caused by gas leaks are also provided.
VVER reactors are pressurized water reactors originally developed in the Soviet Union/Russia. The document discusses the history and evolution of VVER reactor designs from early Generation I and II models through current Generation III+ designs. It provides details on VVER-440, VVER-1000, VVER-1200 and planned VVER-1500 models, describing their key features, safety improvements over time, and global proliferation. Countries operating VVER reactors include Russia, Ukraine, Hungary, Finland, Bulgaria, Slovakia, Czech Republic, China, India, Iran and others.
Source: Honeywell
Gas detection basics
Gas detection sensing technology
Sensor location
SIL in gas detection
Calibration / maintenance
ATEX
www.ie-net.be/reg
www.regeltechnieken.org
Cryogenic Liquid Storage Containers and Componentsinoxindia123
Get to know Cryogenic Liquid Storage containers designed for storage and transportation by maintaining temperatures. Also, go through the basic components designed as well as guidance to take care cryogenic containers.
Thermophysical Properties of RefrigerentsAbu Bakar
This chapter provides thermophysical property data for various refrigerants. It includes pressure-enthalpy diagrams and tables of saturated liquid and vapor properties for each refrigerant. Data is presented for halocarbon, hydrocarbon, inorganic, and cryogenic refrigerants as well as some refrigerant blends. The properties conform to international standards where applicable. The data is intended to help engineers make preliminary comparisons between unfamiliar refrigerants.
The document discusses diesel emissions regulations and exhaust after-treatment technologies for modern diesel engines. It covers:
1) Changes in US emissions standards over time that have driven new technologies.
2) Key technologies developed to reduce emissions include advanced fuel injection systems, alternative fuels like biodiesel, and exhaust after-treatment devices.
3) Common exhaust after-treatment methods mentioned are diesel particulate filters, NOx adsorber catalysts, selective catalytic reduction using urea injection, and catalyzed diesel particulate filters.
introduction to premixed flame,its classification,laminar premixed flame,laminar premixed flame, structured of 1D premixed flame , various zones of premixed flame.
This document discusses the motivation behind designing and fabricating a micro gas turbine using an automotive turbocharger for distributed power generation in India. It outlines issues with India's current power scenario such as power shortage, unreliable supply, and lack of access for 350-400 million people. Distributed power generation using microturbines is presented as a solution to provide reliable off-grid power. The current project aims to develop a low-cost microturbine using a turbocharger to address India's power challenges and enable distributed power generation.
Innovative projects in the refrigeration and Air Conditioning sector UNEP OzonAction
This document summarizes presentations from a regional workshop on low-GWP and energy efficient HCFC replacement technologies in the refrigeration and air conditioning sector. It provides examples of projects from GTZ Proklima in Europe and Asia that demonstrate alternative refrigerant options to HCFCs. Case studies described include a Gree air conditioning unit in China that uses propane instead of HFC-410A, and Johnson Controls chillers that use ammonia or hydrocarbons in Europe with lower energy use and charges than previous HFC systems. The document outlines the objectives, innovations, conclusions and energy savings of these demonstration projects of low-charge ammonia and hydrocarbon refrigerant systems.
The document discusses selective catalytic reduction (SCR) which uses a catalyst to convert nitrogen oxides (NOx) in exhaust gas into nitrogen and water. SCR involves injecting an aqueous urea solution into the exhaust of a diesel engine. The urea then decomposes into ammonia, which reacts with NOx over an SCR catalyst. Common reducing agents for SCR include anhydrous ammonia, aqueous ammonia, and urea solution. Urea is preferred because it is non-toxic, easy to transport and dose, and can reduce NOx emissions by up to 90% while also reducing other emissions and improving fuel economy. The document concludes that SCR and other aftertreatment devices are required to meet increasingly
This document provides an overview of a training session on fans and blowers for energy efficiency. It discusses the key components of fans, how to assess fan performance and efficiency, and identifies various opportunities to improve energy efficiency, such as choosing the right fan size, reducing system resistance, maintaining fans properly, and controlling air flow through methods like variable speed drives.
Oil analysis involves sampling machine lubricants and analyzing them to monitor lubricant health, equipment health, and contamination levels. It can detect wear in components, coolant leakage, and filter effectiveness. Common tests analyze viscosity, water content, acidity, additives, and wear particles. Together these provide information on lubricant condition, equipment operation, and maintenance strategy effectiveness to optimize service intervals and avoid unexpected breakdowns.
Comparison of cycles and measurement of exhaust gases.pptxSAshwinDaniel
1. The document discusses various methods for measuring exhaust emissions from vehicles including carbon monoxide (CO), nitrogen oxides (NOx), oxygen/air-fuel ratio, smoke, and particulates.
2. It describes the construction and working principles of different analyzer instruments that use techniques like infrared absorption, chemiluminescence reactions, and electrochemical cells.
3. Emission control methods like thermal converters and catalytic converters are explained, along with their advantages and limitations in automotive applications. Recent developments in emission standards and control technologies are also summarized.
This document is a design lab report for an electronic circuit for a gas sensor array. It summarizes the introduction, working principles, and structure of gas sensors. It then describes the specific gas sensor used - the TGS2610 - and provides its specifications and dimensions. The experiment procedure explains the circuit components, diagram, and discussion of how the circuit detects LPG gas and could be extended for multiple sensors or interfaced with data acquisition software.
This document describes the design of a mechanically-actuated chemical oxygen generator that uses sodium chlorate dissociation. Key points:
- The system uses a bead chain to transport sodium chlorate powder into a heated tube, where the salt dissociates into oxygen gas and sodium chloride waste.
- Sensors monitor temperature and pressure to control the heating rate and regulate oxygen production.
- The generator is intended to provide oxygen for an underwater vehicle's hydrogen fuel cell power system as an alternative to bulky battery storage.
- Potential applications also include providing oxygen for industrial and medical uses as a safer alternative to pressurized gas cylinders.
Soot sensor to fulfill euro6 obd requirementskhedayat
1) The document describes a novel soot sensor design with a single layer sensing element that overcomes challenges with traditional resistive soot sensors.
2) The single layer design integrates the heating and sensing functions into a simple construction, improving regeneration efficiency and enabling robust diagnostics.
3) Testing showed the single layer sensor can regenerate effectively even at high exhaust flows, requires less voltage for regeneration than conventional designs, and responds well to varying soot concentrations.
Gas chromatography–mass spectrometry (GC-MS) is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample.[1] Applications of GC-MS include drug detection, fire investigation, environmental analysis, explosives investigation, food and flavor analysis, and identification of unknown samples, including that of material samples obtained from planet Mars during probe missions as early as the 1970s. GC-MS can also be used in airport security to detect substances in luggage or on human beings. Additionally, it can identify trace elements in materials that were previously thought to have disintegrated beyond identification. Like liquid chromatography–mass spectrometry, it allows analysis and detection even of tiny amounts of a substance.[2]
GC-MS has been regarded as a "gold standard" for forensic substance identification because it is used to perform a 100% specific test, which positively identifies the presence of a particular substance. A nonspecific test merely indicates that any of several in a category of substances is present. Although a nonspecific test could statistically suggest the identity of the substance, this could lead to false positive identification. However, the high temperatures (300°C) used in the GC-MS injection port (and oven) can result in thermal degradation of injected molecules,[3] thus resulting in the measurement of degradation products instead of the actual molecule(s) of interest.The first on-line coupling of gas chromatography to a mass spectrometer was reported in the late 1950s.[4][5] An interest in coupling the methods had been suggested as early as December 1954.
The document discusses oxygen sensors, which measure the proportion of oxygen in exhaust gases. It describes how oxygen sensors were developed in the 1960s and have since been important for pollution control in automobiles. The document outlines different types of oxygen sensors, including those used in automobile exhaust systems to optimize air-fuel ratios and reduce emissions. It explains how oxygen sensors work and the factors that determine their performance.
Atomic absorption spectroscopy is a technique used to detect metals and metalloids in samples. It works by heating the sample into a gaseous state, then passing it through a flame or furnace where it absorbs light from a lamp containing the element of interest. This absorption is measured to determine the element's concentration. The first atomic absorption spectrometer was developed in 1954. It uses the principle that free atoms can absorb radiation at specific frequencies to quantify the amount of a given element present. Modern instruments have improved components like graphite furnaces for heating samples and better light sources, detectors, and optics for higher sensitivity and precision.
Using an Agilent 6890 GCMS with Entech Canister SamplerTAMUK
This document provides instructions for using an Agilent 6890N GC/MS with an Entech preconcentrator to analyze volatile organic compounds according to EPA Method TO-15. Key steps include: cleaning and preparing canisters for sample collection; concentrating the samples using the Entech preconcentrator to remove air, CO2, and water; tuning the GC/MS using perfluorotributylamine; and running the samples using the specified temperature program and instrument parameters. Proper tuning of the GC/MS is important to obtain accurate mass spectra that can be used to identify VOC components in the samples.
Content for report on micro electronic pillRohit Roy
This document summarizes the design and fabrication of a microelectronic pill capable of multi-parameter physiological analysis. It incorporates four sensor chips measuring temperature, pH, conductivity, and oxygen. The sensors were fabricated using microfabrication techniques on silicon and integrated with an application-specific circuit for control and data transmission. The pill is designed to wirelessly transmit physiological data for medical research applications to study conditions like gastrointestinal disease.
Electrochemical carbon monoxide sensors require regular maintenance to function properly and maximize their lifespan. They work by measuring the current produced from oxidation and reduction chemical reactions between electrodes and electrolytes when exposed to carbon monoxide gas. Typically, electrochemical gas sensors can operate for one to three years, but following manufacturer recommended calibration procedures every six months can extend their lifespan to five to seven years. It is important to calibrate the sensors regularly given the toxicity of carbon monoxide and potential safety consequences if the sensors provide inaccurate readings over time.
Controlling of Formation of Hot Spots in Si Engines by Altering the Material ...IRJET Journal
The document discusses controlling the formation of hot spots in SI engines by altering the material of the insulator tip of the spark plug. Hot spots generally form near the spark plug and exhaust valve over long engine operation and increase knocking tendency and harmful emissions. The study examines coating the insulator tip with tungsten and copper alloy to improve combustion and reduce emissions. Testing was done on a 3HP petrol engine. Results show coated spark plug increased efficiencies and reduced unsaturated hydrocarbons and carbon oxides compared to a usual spark plug.
Fabrication of microfluidic channels in glass and siliconYichen Sun
Microfluidic channels in glass and silicon chips are fabricated in the cleanroom. Their acoustic focusing properties are then tested and reported in this project report (MEMS 5801).
Gas chromatography is a technique used to separate components in a gaseous mixture. It works by injecting a sample into a carrier gas that flows through a column coated with a stationary phase. The different components interact differently with the stationary phase, leading to separation as they migrate through the column at different rates. Key aspects of gas chromatography include the carrier gas, stationary phase, column type, injector, and detectors used for qualitative and quantitative analysis. Common detectors include the thermal conductivity detector, flame ionization detector, and electron capture detector.
Deep explanation of gas sensors for engineering studentsDayalAnand
The document discusses gas sensors. It begins by defining a sensor and listing common sensor applications. It then defines gas sensors as a subclass of chemical sensors that measure the concentration of gas. Various gas sensing technologies are described, including metal oxide, capacitive, acoustic, calorimetric, optical, and electrochemical sensors. Metal oxide sensors detect gas concentration changes by measuring resistance changes of a thin film. Capacitive sensors measure dielectric constant changes. Acoustic sensors use piezoelectric materials. Calorimetric sensors detect heat changes from gas combustion. Optical sensors use techniques like ellipsometry and spectroscopy. Electrochemical sensors create current from gas oxidation and reduction reactions. Applications and advantages of gas sensors
The Claus process is the industry standard and so the most
significant gas desulfurizing process, recovering elemental sulfur
from gaseous hydrogen sulfide.
The process is commonly referred to as a sulfur recovery unit
(SRU) and is very widely used to produce sulfur from the
hydrogen sulfide found in raw natural gas and from the by-product
sour gases containing hydrogen sulfide derived from refining
petroleum crude oil and other industrial facilities.
There are many hundreds of Claus sulfur recovery units in
operation worldwide.
In fact, the vast majority of the 68,000,000 metric tons of sulfur
produced worldwide in one year is by-product sulfur from
petroleum refining and natural gas processing plants.
Design and Development of Catalytic Converter for Reduction of Pollution by U...YogeshIJTSRD
The use of fossil fuels in automobiles mainly HC, CO and NOX which produce harmful green house gases. The main objective of catalytic converter is to reduce and control effect of harmful pollutants by converting toxic CO and NOX to non toxic CO2and H2O. CFD analysis is done in the present study of catalytic converter by taking three different materials for the make of catalytic converter such as stainless steel, Grey cast iron and aluminum at the time by varying different fluids such as methane, ethane and nitrogen at varying speeds of 2000 and2500R.P.M. V. Saran Tej | M. Rakesh Kumar | N. Satya Sandeep | N. Sai "Design and Development of Catalytic Converter for Reduction of Pollution by Using Transient and CFD Analysis" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd43784.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/43784/design-and-development-of-catalytic-converter-for-reduction-of-pollution-by-using-transient-and-cfd-analysis/v-saran-tej
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
High pressure vessel leakage in urea plantsPrem Baboo
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1. The first oxygen sensor
developed by Bosch was
Figure 1. Bosch oxygen sensor. installed in a Volvo 240/260
series vehicle 25 years ago.
osch delivered 10 million oxygen sensors to the U.S.
B market in 1976 and by 1983 the number had risen to 50
million. Today, Bosch produces 33 million oxygen
sensors per year. 1
λ control range (catalyst window)
In 1982 Bosch launched the heated oxygen sensor which NOx
reaches full operability in 30 seconds after a cold engine is Engine
started. The sensor is heated to 400 oC and has a service life of emissions
HC
160,000 km, twice as long as the previous unheated sensor. CO
In 1994 Bosch developed an oxygen sensor with a planar
ceramic structure that is fully functioning 10 seconds after the
vehicle is started. 2
CO
Today’s oxygen sensor NOx
Engine
Oxygen sensors (see Figure 1) are required today due to the emissions HC
increasingly tough exhaust emissions and go hand-in-hand
with the catalytic converters. One oxygen sensor is used in the
exhaust branch right before the catalytic converter. Sometimes
a second oxygen sensor is placed in the exhaust system after the 3
catalytic converter of a spark-ignition engine to permit opti-
mum performance of the three-way catalytic converters. λ-sensor
The information obtained from the sensors indicates how voltage
complete the combustion process is in the combustion cham-
ber. The optimum readings are obtained when the air to fuel
ratio is 14.7 to one. The stoichiometric air/fuel ratio is the mass 0.975 1.0 1.025 1.05
of 14.7 kg of air to 1 kg of gasoline theoretically necessary for rich Excess- air factor λ lean
complete combustion. The excess air factor or air ratio (λ)
indicates the deviation of the actual air/fuel ratio from the Figure 2. Control range and reductions in exhaust under three
theoretically required ratio. λ = (actual induced air mass)/ scenarios. Number 1 is without a catalytic converter. Number 2 is with
(theoretical air requirement). a catalytic converter. Number 3 is the λ oxygen sensor voltage curve.
Service Tech Magazine/May 2001 13
2. 1. Ceramic coating 2. Electrodes 3. Contacts 4. Housing contacts 1. Porous protective layer 2. External electrode
5. Exhaust pipe 6. Ceramic support shield (porous) 3. Sensor laminate 4. Internal electrode 5. Reference air laminate
7. Exhaust gas 8. Ambient air 6. Insulation layer 7. Heater 8. Heater laminate
9. Connection contacts
8 1
7
5
2
4 3
1
4
2 3 5
6 6
7
V, voltage 6
8
9
Figure 3. Oxygen sensor in exhaust pipe. Figure 6. Operational layers in a planar oxygen sensor.
Variations from this optimum ratio result in various levels The three way catalytic converter is able to reduce the HC,
of emissions. Excess fuel results in the formation of hydrocar- CO, and NOx emissions by more than 98% provided the engine
bons (HC) and carbon monoxide (CO). Excess air can cause operates within a very narrow scatter range (<1%) centered
increased levels of nitrogen oxides (NOx). The oxygen sensor around the stoichiometric air/fuel ratio (see Figure 2). A closed
or sensors can identify any variations from the ideal air/fuel loop control system that relies on a closed loop control circuit
ratio and send a signal to the engine management system to to maintain the air/fuel mixture consistently within the optimal
adjust the ignition and injection processes. range known as the catalyst window is the best strategy.
Sensor design
1. Sensor housing 2. Ceramic support tube 3. Connection wire 4. Guard tube with slots
5. Active ceramic sensor layer 6. Contact 7. Protective cap 8. Heater element The oxygen sensor (see Figure 3) is a gal-
9. Crimped connections for heater element 10. Spring washer vanic oxygen concentration cell with a
1 2 3 solid state electrolyte. The solid state elec-
trolyte is an impermeable zirconium diox-
ide ceramic unit stabilized with yttrium
oxide. It is open on one end and closed on
the other. Mounted on both the inner and
outer surfaces are gas permeable platinum
electrodes.
The platinum electrode on the outside
4 5 6 7 8 9 10 acts as a miniature catalyst to support reac-
tions in the incoming exhaust gases and
Figure 4. Heated oxygen sensor. bring them into a state of stoichiometric
balance. The side that is exposed to the
1. Guard tube 2. Ceramic seal assembly 3. Sensor housing 4. Ceramic support tube exhaust gases also has a porous ceramic
5. Planar sensor element 6. Protective cap 7. Connection wire layer (Spinell coating) to protect against
contamination. A metal tube with numer-
1 2 3 4 5 6 7
ous slots guards the ceramic body against
impacts and thermal shocks. The inner
cavity is open to the atmosphere which
serves as the unit’s reference gas.
The two-state sensor operation is based
in the Nernst Principle. The sensor’s ce-
ramic material conducts oxygen ions at
temperatures 350oC and above. Disparities
in oxygen levels on the respective sides of
Figure 5. Planar oxygen sensor the sensor will result in the generation of
14 Service Tech Magazine/May 2001
3. electrical voltage between the two surfaces. This voltage
1. Mass airflow sensor 2. Engine 3a. Oxygen sensor 1
serves as the index of how much the oxygen levels vary on the 3b. Oxygen sensor 2 4. Catalytic converter 5. Injectors
two sides of the sensor. The amount of residual oxygen in the 6. Electronic control unit
exhaust fluctuates sharply in response to the variation in the Vv Valve control voltage Vs sensor voltage Qe injection quantity
induction mixture’s air/fuel ratio.
Oxygen sensitive voltage generation ranges from 800 to
1000 millivolts for rich mixtures to as low as 100 millivolts for
lean mixtures. The transition from rich to lean corresponds to Exhaust gas
Air
450 to 500 millivolts.
1 2 4
Heated oxygen sensor
3a 3b
An electric heater element (see Figure 4) is used to warm the
Qe
ceramic material when the engine is operating at low load Fuel
factors. At the higher load factors the sensor’s temperature is 5
determined by the exhaust gas. The heated oxygen sensor helps
Vsa Vsb
ensure low and stable emissions due to the consistent mainte- Vv
nance of optimal operating temperatures.
6
Planar λ oxygen sensor
The basic operating concept (see Figure 5) is the same as the
heated finger- type sensor in that it generates a response curve
with a characteristic jump at λ equal to one. The planar sensor
is distinguished from the finger type by:
• the solid body electrolyte consists of ceramic layers Figure 8. Diagram of closed a λ closed-loop mixture control.
• a solid ceramic sealant retains the sensor element within the
sensor casting chamber (diffusion gap) in the Nernst cell. This configuration
• a dual-wall guard tube protects the sensor element against contrasts with the layout of the two-state sensor by maintaining
excessive thermal and physical stresses a consistently stoichiometric air/fuel ratio in the chamber.
The individual active layers (see Figure 6) are manufactured Electronic circuitry modulates the voltage supply to maintain
using silk-screening techniques. Stacking laminated layers the composition of the gas in the monitoring chamber at a
with various configurations makes it possible to integrate a consistent λ equals one. The pump cell corresponds to lean
heater within the sensor element. exhaust by discharging oxygen from the diffusion gap to the
outside, but reacts to rich exhaust by pumping oxygen from the
Wide band λ oxygen sensor surrounding exhaust gas into the diffusion gap, reversing the
This sensor expands on the principle of the Nernst unit (two- direction of the current. Because the pumping current is also
state sensor function) by incorporating a second chamber, the proportional to the oxygen concentration and/or oxygen defi-
pump cell (see Figure 7). It is through this small slot in this ciency, it serves as an index of the excess air-factor of the
pump cell that the exhaust gas enters the actual monitoring exhaust gas. An integral heater unit ensures an operating
temperature of at least 600oC.
The two-state unit uses the voltage at the Nernst cell as a
1. Nernst cell 2. Reference cell 3. Heater 4. Diffusion gap direct measurement signal while the wide band sensor employs
5. Pump cell 6. Exhaust pipe special processing and control circuitry to set the pumping
current. This current is then monitored and measured as an
index of the exhaust gas’s excess-air factor. Because sensor
operation is no longer dependent on the step function response
+
- of the Nernst cell, air factors ranging from 0.7 to 4 can be
monitored as a continuous progression. Thus λ control of the
engine can proceed on a reference spectrum instead of depend-
ing solely upon a single point.
Closed loop control
3 The oxygen sensor relays a voltage signal to the electronic
engine management unit which then issues a command to the
injection system to enrichen or lean out the mixture as indicated
4
by the oxygen sensor’s signal voltage (see Figure 8). The
system thus counters lean mixtures by increasing the injected
fuel quantity and rich mixtures by reducing it.
5 1 2
Information and illustrations for this article supplied by
6
Bosch.
Figure 7. Design of a continuous action, wide-band oxygen sensor Interesting? Circle 11
showing the sensor’s installation in the exhaust pipe. Not interesting: Circle 12
Service Tech Magazine/May 2001 15