Pollutant,their formation and control in Internal Combustion EnginesHassan Raza
This presentation was prepared by Mechanical Engineering students during their Internal Combustion Course. Students belong to a very prestigious Engineering institute of Pakistan "University of Engineering and Technology Lahore"
Pollutant,their formation and control in Internal Combustion EnginesHassan Raza
This presentation was prepared by Mechanical Engineering students during their Internal Combustion Course. Students belong to a very prestigious Engineering institute of Pakistan "University of Engineering and Technology Lahore"
What is Bharat Stage 6? Bharat Stage 6 Emission Standards | BS6 ppt file | Pr...Sandeep Kumar
This is the detailed presentation file about Bharat Stage 6 Emission Standards. It include all the information about What is Bharat Stage 6, BS6, BS VI & why it implemented & what was the process behind it. This ppt include all the details about the Standards & limits about Emission of Chemicals & exhaust gases from smoke of vehicles. Hope this will be helpful for you.
Made by- Er. SANDEEP KUMAR
As we know air pollution is big challenge for the world
The air pollution due to automobile is 70% of total pollution of air pollution.
We have several way for controlling automobile pollution.
The most effective way is by using catalytic converter in automobile
In short catalytic converter are used to convert the harmful gas to harmless gas
Three basic methods used to control engine emissions:
1)Engineering of combustion process -advances in fuel injectors, oxygen sensors, and on-board computers.
2) Optimizing the choice of operating parameters -two Nox control measures that have been used in automobile engines are spark retard and EGR.
3) After treatment devices in the exhaust system -catalytic converter.
What is Bharat Stage 6? Bharat Stage 6 Emission Standards | BS6 ppt file | Pr...Sandeep Kumar
This is the detailed presentation file about Bharat Stage 6 Emission Standards. It include all the information about What is Bharat Stage 6, BS6, BS VI & why it implemented & what was the process behind it. This ppt include all the details about the Standards & limits about Emission of Chemicals & exhaust gases from smoke of vehicles. Hope this will be helpful for you.
Made by- Er. SANDEEP KUMAR
As we know air pollution is big challenge for the world
The air pollution due to automobile is 70% of total pollution of air pollution.
We have several way for controlling automobile pollution.
The most effective way is by using catalytic converter in automobile
In short catalytic converter are used to convert the harmful gas to harmless gas
Three basic methods used to control engine emissions:
1)Engineering of combustion process -advances in fuel injectors, oxygen sensors, and on-board computers.
2) Optimizing the choice of operating parameters -two Nox control measures that have been used in automobile engines are spark retard and EGR.
3) After treatment devices in the exhaust system -catalytic converter.
In response to an increasing push for clean diesel emissions, medium and heavy duty diesel-powered trucks have adopted complex exhaust or emission aftertreatment systems.
These systems treat post-combustion gases after they leave the engine, reducing environmental impact without sacrificing power or performance.
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.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
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.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
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.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
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.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
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.
10. The Cylinder & Hydrocarbon Emission Sources
All these collection centers accumulate air fuel mixture during
compression.
They release unburnt HCs during Expansion into Cylinder.
11. Hydrocarbon Release into Atmosphere Exhaust Process
Exhaust
valve
opens
Exhaust
valve
closes
The first peak is due to blow down and the second peak is due to
vortex roll up and exhaust (vortex reaches exhaust valve at
roughly 290o)
TC
BC
12. Hydrocarbon Emission Sources for SI Engines
There are six primary Sources believed to be responsible for
hydrocarbon emissions:
% fuel escaping
Source normal combustion % HC emissions
Crevices 5.2 38
Oil layers 1.0 16
Deposits 1.0 16
Liquid fuel 1.2 20
Flame quench 0.5 5
Exhaust valve leakage 0.1 5
Total 9.0 100
RT
p
x
x
T
dt
HC
d
O
HC 2
ˆ
ˆ
18735
exp
10
7
.
6 15
13. Heat Transfer from Cylinder
c
g
coolant
gas
h
k
x
h
T
T
A
Q
q
1
1
18. Formation of CO in IC Engines
• Formation of CO is well established.
• Locally, there may not be enough O2 available for complete
oxidation and some of the carbon in the fuel ends up as CO.
• The amount of CO, for a range of fuel composition and C/H ratios,
is a function of the relative air-fuel ratio.
• Even at sufficient oxygen level, high peak temperatures can cause
dissociation.
• Conversion of CO to CO2 is governed by reaction
H
CO
OH
CO
2
• Dissociated CO may freeze during the expansion stroke.
The highest CO emission occurs during engine start up (warm up)
when the engine is run fuel rich to compensate for poor fuel
evaporation.
21. Particulates
• A high concentration of particulate matter (PM) is manifested
as visible smoke in the exhaust gases.
• Particulates are any substance other than water that can be
collected by filtering the exhaust, classified as:
• Solid carbon material or soot.
• Condensed hydrocarbons and their partial oxidation products.
• Diesel particulates consist of solid carbon (soot) at exhaust gas
temperatures below 500oC, HC compounds become absorbed on
the surface.
• In a properly adjusted SI engines soot is not usually a problem .
• Particulate can arise if leaded fuel or overly rich fuel-air mixture
are used.
• Burning crankcase oil will also produce smoke especially during
engine warm up where the HC condense in the exhaust gas.
23. 23
The soot formation process is very fast.
10 – 22 C atoms are converted into 106 C atoms in less than 1 ms.
Based on equilibrium the composition of the fuel-oxidizer mixture soot ,
formation occurs when x ≥ 2a (or x/2a ≥ 1) in the following reaction:
Mechanism of Formation of Particulates (soot)
)
(
)
2
(
2
2 2
2 s
C
a
x
H
y
aCO
aO
H
C y
x
Experimentally it is found that the critical C/O ratio for onset of soot
formation is between 0.5 and 0.8.
The CO, H2, and C(s) are subsequently oxidized in the diffusion flame
to CO2 and H2O via the following second stage.
O
H
O
H
CO
O
s
C
CO
O
CO 2
2
2
2
2
2
2
2
1
)
(
2
1
Any carbon not oxidized in the cylinder ends up as soot in the exhaust!
25. NOx Formation in I.C. Engines
Three chemical reactions form the Zeldovich reaction are:
Forward rate constants:
T
k
T
k
T
k
f
f
f
/
450
exp
10
1
.
7
/
4680
exp
10
8
.
1
/
38370
exp
10
8
.
1
10
,
3
7
,
2
11
,
1
Zelodvich reaction is the most significant mechanism of NO
formation in IC engines.
26. 26
Global Reaction Rate
• Using the chemical reactions given, one can write the
following expression for the rate of change of nitric oxide
concentration.
• Where the brackets denote concentrations in units of
molecules/m3.
• Approximations to solve above equation:
• The C-O-H system is in equilibrium and is not perturbed by N2
dissociation.
• This means that the pressure, temperature, equivalence ratio
and residual fraction of fluid element only are required to
calculate NO concentration.
• N atoms change concentration by a quasi-steady process.
• This means that one can solve for the N atom concentration by
setting the rate of change of atoms to zero.
H
NO
k
OH
N
k
O
NO
k
O
N
k
N
NO
k
N
O
k
dt
NO
d
b
f
b
f
b
f ,
3
,
3
,
2
2
,
2
,
1
2
,
1
27. Rate of NO Formation
27
dt
NO
d
K
T,
6
.
0
2
.
1
0
.
1
29. Emissions Control
• Three basic methods used to control engine emissions:
• 1)Engineering of combustion process -advances in fuel
injectors, oxygen sensors, and on-board computers.
• 2) Optimizing the choice of operating parameters -two Nox
control measures that have been used in automobile engines
are spark retard and EGR.
• 3) After treatment devices in the exhaust system -catalytic
converter.
29
30. 30
Anatomy of Catalytic Converter for SI Engines
•All catalytic converters are built in a honeycomb or pellet geometry
to expose the exhaust gases to a large surface made of one or more
noble metals: platinum, palladium and rhodium.
•Rhodium used to remove NO and platinum used to remove HC and
CO.
Lead and sulfur in the exhaust gas severely inhibit the operation
of a catalytic converter (poison).
31. 31
Three-way Catalytic Converter
•A catalyst forces a reaction at a temperature lower than normally
occurs.
•As the exhaust gases flow through the catalyst, the NO reacts with
the CO, HC and H2 via a reduction reaction on the catalyst surface.
• NO+CO→½N2+CO2 , NO+H2 → ½N2+H2O, and others
•The remaining CO and HC are removed through an oxidation
reaction forming CO2 and H2O products (air added to exhaust after
exhaust valve).
•A three-way catalysts will function correctly only if the exhaust gas
composition corresponds to nearly (±1%) stoichiometric combustion.
• If the exhaust is too lean – NO is not destroyed
• If the exhaust is too rich – CO and HC are not destroyed
•A closed-loop control system with an oxygen sensor in the exhaust is
used to A/F ratio and used to adjust the fuel injector so that the A/F
ratio is near stoichiometric.