Classification of Fuel, Characteristics of good fuel, Calorific value and types of calorific value, bomb calorimeter, Boys calorimeter ,numerical s on bomb calorimeter, Boys calorimeter
Fuel is a combustible substance, containing carbon as main constituent, which...drmanojkarar
Energy resources: While selecting an ideal fuel for domestic or industrial purpose we should keep in mind that the fuel selected must possess the following characteristic properties.
1) It should possess high calorific value.
2) It should have proper ignition temperature. The ignition temperature of the fuel should neither be too low nor too high.
3) It should not produce poisonous products during combustion. In other words, it should not cause pollution o combustion.
4) It should have moderate rate of combustion.
5) Combustion should be easily controllable i.e., combustion of fuel should be easy to start or stop as and when required.
6) It should not leave behind much ash on combustion.
7) It should be easily available in plenty.
8) It should have low moisture content.
9) It should be cheap.
10) It should be easy to handle and transport.
Calorific value: It is defined as the total amount of heat liberated, when unit mass or unit volume of the fuel is completely burnt in air or oxygen.
Units of heat:
a) Calorie: The amount of heat required to increase the temperature of 1 gm of water through one degree centigrade.
b) Kilocalorie: It is equal to 1000 calories. The quantity of heat required to rise the temperature of 1 Kg of water through one degree centigrade.
1 K.cal = 1000 cals
c) British thermal unit (B.Th.U.): The quantity of heat required to rise the temperature of 1 pound of water through one degree Farenheit.
1 B.Th.U = 252 cals = 0.252 K.cal
d) Centigrade heat unit (C.H.U): The quantity of heat required to rise the temperature of one pound of water through one degree centigrade.
1 K. cal = 3.968 B.Th.U = 2.2 C.H.U
For solids or liquid fuel: Calorie/gm (cal/gm) (or) Kilocalorie/Kg (K.cal/Kg) (or) B.Th.U/lb
For gaseous fuels: Kilocalorie/cubic meter (K.cal/m3) (or) B.Th.U/ft3
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid. The oxidizer, likewise, could be a solid, liquid, or gas.
Classification of Fuel, Characteristics of good fuel, Calorific value and types of calorific value, bomb calorimeter, Boys calorimeter ,numerical s on bomb calorimeter, Boys calorimeter
Fuel is a combustible substance, containing carbon as main constituent, which...drmanojkarar
Energy resources: While selecting an ideal fuel for domestic or industrial purpose we should keep in mind that the fuel selected must possess the following characteristic properties.
1) It should possess high calorific value.
2) It should have proper ignition temperature. The ignition temperature of the fuel should neither be too low nor too high.
3) It should not produce poisonous products during combustion. In other words, it should not cause pollution o combustion.
4) It should have moderate rate of combustion.
5) Combustion should be easily controllable i.e., combustion of fuel should be easy to start or stop as and when required.
6) It should not leave behind much ash on combustion.
7) It should be easily available in plenty.
8) It should have low moisture content.
9) It should be cheap.
10) It should be easy to handle and transport.
Calorific value: It is defined as the total amount of heat liberated, when unit mass or unit volume of the fuel is completely burnt in air or oxygen.
Units of heat:
a) Calorie: The amount of heat required to increase the temperature of 1 gm of water through one degree centigrade.
b) Kilocalorie: It is equal to 1000 calories. The quantity of heat required to rise the temperature of 1 Kg of water through one degree centigrade.
1 K.cal = 1000 cals
c) British thermal unit (B.Th.U.): The quantity of heat required to rise the temperature of 1 pound of water through one degree Farenheit.
1 B.Th.U = 252 cals = 0.252 K.cal
d) Centigrade heat unit (C.H.U): The quantity of heat required to rise the temperature of one pound of water through one degree centigrade.
1 K. cal = 3.968 B.Th.U = 2.2 C.H.U
For solids or liquid fuel: Calorie/gm (cal/gm) (or) Kilocalorie/Kg (K.cal/Kg) (or) B.Th.U/lb
For gaseous fuels: Kilocalorie/cubic meter (K.cal/m3) (or) B.Th.U/ft3
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid. The oxidizer, likewise, could be a solid, liquid, or gas.
Combustion of gaseous fuels - its characteristicsAyisha586983
Combustion of gaseous fuels, such as natural gas (methane), propane, butane, and hydrogen, involves the reaction of these gases with oxygen to produce heat, light, and combustion products. The combustion process of gaseous fuels exhibits several distinctive characteristics compared to solid or liquid fuels
The ppt is especially designed for engineering students. The lecture explains about fuels, its types, characteristics and in the last we have discussed about measurement of calorific value using Bomb calorimeter.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Combustion of gaseous fuels - its characteristicsAyisha586983
Combustion of gaseous fuels, such as natural gas (methane), propane, butane, and hydrogen, involves the reaction of these gases with oxygen to produce heat, light, and combustion products. The combustion process of gaseous fuels exhibits several distinctive characteristics compared to solid or liquid fuels
The ppt is especially designed for engineering students. The lecture explains about fuels, its types, characteristics and in the last we have discussed about measurement of calorific value using Bomb calorimeter.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
2. 2
TOPICS TO BE COVERED
• FUEL
• COMBUSTION OF FUEL
• CLASSIFICATION OF FUEL
• CALORIFIC VALUE
• CHARACTERISTICS OF GOOD
FUEL
• REVIEW OF TOPIC IN TERMS
OF MULTIPLE CHOICE
QUESTIONS
3. 3
FUEL
The combustible substances which
on burning in air produces large
amount of heat that can be used
economically for domestic and
industrial purposes are called fuels.
Eg. Wood ,Coal etc
4. 4
COMBUSTION OF FUEL
The term combustion refers to the
exothermal oxidation of a fuel, by air or
oxygen occurring at a sufficiently rapid rate
to produce a high temperature, usually with
the appearance of a flame.
5. 5
As most of the fuels contain carbon or
carbon and hydrogen, the combustion
involves the oxidation of carbon to
carbon dioxide and hydrogen to water.
Sulphur, if present, is oxidised to
sulphur dioxide while the mineral matter
forms the ash. Complex fuels like coal
undergo thermal decomposition during
combustion to give simpler products
which are then oxidised to carbon
dioxide, water etc.
6. 6
e.g.: Coke on combustion gives carbon
dioxide
Coal → Coke + Coal gas
C (coke) + O2 → CO2
8. 8
On the basis of occurrence
FUEL
PRIMARY OR
NATURAL FUEL
SECONDARY OR
ARTIFICIAL FUEL
9. 9
CLASSIFICATION OF FUEL
Fuels are classified as
• Primary fuels – Fuels which occur
naturally such as coal, crude petroleum
and natural gas. Coal and crude
petroleum, formed from organic matter
many millions of years ago, are referred
to as fossil fuels.
• Secondary fuels – Fuels which are
derived from naturally occurring ones by
a treatment process such as coke,
gasoline, coal gas etc.
11. 11
FUEL
Primary Fuels
Solid
Eg. Wood,peat Liquid
Eg.crude oil
Gas
Eg.Natural gas
Secondary fuels
Solid
EgCoke,charcoal
Liquid
Eg. Petrol ,LPG
Gas
Eg.coal gas ,water gas
12. 12
CHARACTERISTICS OF
GOOD FUEL
1.HIGH CALORIFIC VALUE:
A good fuel should have high
calorific value i.e. it should
produce large amount of heat on
burning.
13. 13
CALORIFIC VALUE
The calorific value of a fuel is defined as
the quantity of heat (expressed in
calories or kilo calories) liberated by the
complete combustion of unit weight
(1gm or 1kg) of the fuel in air or
oxygen,with subsequent cooling of the
products of combustion to the initial
temperature of the fuel.
14. 14
contd
The calorific value of a fuel depends
upon the nature of the fuel and the
relative proportions of the elements
present, increasing with increasing
amounts of hydrogen. Moisture if
present, considerably reduces the
calorific value of a fuel. The calorific
value may be theoretically
calculated from the chemical
composition of the fuel.
15. 15
contd
.
If both hydrogen and oxygen are
present, it may be assumed that all the
oxygen are already combined with 1/8
of its weight of hydrogen to form water.
This fraction is then deducted from the
hydrogen content of the fuel in the
calculation. Thus for a fuel containing
carbon, hydrogen, oxygen and sulphur,
the calorific value of the fuel is given
by DULONG FORMULA
16. 16
Determination of calorific value
from Dulong formula
Calorific value =
1/100[8080 C + 34500 {H − O/8 }
+2240 S] kcal/kg
where C, H, O, S refer to % of carbon,
hydrogen, oxygen and sulphur
respectively.
17. 17
GROSS AND NET CALORIFIC VALUE
With fuels containing hydrogen, two calorific
values are distinguished, the gross and the net
calorific value.
GROSS CALORIFIC VALUE
The gross calorific value refers to the heat
evolved when the water produced by
combustion is condensed as a liquid. The
net value gives the heat liberated when
water is in the form of steam or water
vapour.
18. 18
contd
Thus the gross calorific value (or the
higher heating value) is the quantity of
heat liberated by the complete
combustion of unit weight of the fuel with
subsequent cooling of the products of
combustion to the initial temperature of
the fuel.
19. 19
NET CALORIFIC VALUE
Under normal working conditions,
water vapours produced during
combustion are not condensed
and escape as such along with the
hot gases.Hence lesser amount of
heat is available, which is called
Lower or net calorific value.
20. 20
Contd.
Net calorific value is the heat
produced when unit mass of fuel
is burnt completely and products
of combustion are allowed to
escape.
21. 21
contd
The net calorific value (or the
lower heating value) is defined as
the gross calorific value minus
the latent heat of condensation of
water (at the initial temperature of
the fuel), formed by the
combustion of hydrogen in the
fuel.The latent heat of steam at
ordinary temperature may be
taken as 587cal/g
22. 22
contd
Net calorific value=Gross calorific
value-Latent heat of water vapours
NCV=GCV-weight of hydrogen x 9 x
Latent heat of water vapours
Latent heat of water vapours is 587
kcal/kg
23. 23
Calculation of Net calorific value
Hydrogen in the fuel reacts with oxygen to
give water
H2 + 1/2 O2 → H2O
2H = 1/2O2 = H2O
2parts = 16parts = 18parts
1parts = 8parts = 9parts
24. 24
Contd
Let H is the percentage of hydrogen in
the fuel
Amount of water produced by burning
unit mass of fuel=9H/100 g
Latent heat of steam=587cal/g
Amount of heat produced by
condensation of steam=9H/100 x587 cal
NCV=[GCV-9H/100 x 587]
=[GCV-0.09 x 587] cal/g
25. 25
2. MODERATE IGNITION
TEMPERATURE:
Ignition temperature: the lowest
temperature to which fuel must be
preheated so that it starts burning
smoothly. If ignition temp. is low, the
fuel catches fire easily. Low ignition
temperature is dangerous for storage
and transportation of fuel. High
temperature causes difficulty in
kindling. So ,a good fuel should have
moderate ignition temperature.
27. 27
4.LOW NON-COMBUSTIBLE
MATTER CONTENT
A good fuel should have low
contents of non-combustible
material as non-combustible matter
is left in form of ash which
decreases the calorific value of fuel
28. 28
5.MODERATE RATE OF
COMBUSTION:
The temperature of combustion of
fuel depends upon the rate of
combustion . If the rate of
combustion is low ,then required
high temperature may not be
reached soon. On the other hand
,too high combustion rate causes
high temperature very quickly.
29. 29
6.MINIMUM SMOKE AND NON-
POISONOUS GASES
On burning, Fuel should not give
out objectionable and poisonous
gases. In other words, gaseous
products should not pollute the
atmosphere. Gases like
CO,SO2,H2S etc. are some of
harmful gases.
30. 30
7.CHEAP: A good fuel should be
cheap and readily available.
8.EASY TRANSPORTATION :
A good fuel should be easy to
handle and transport at low cost
31. 31
9.CONTROLLABLE
COMBUSTION:
Combustion of fuel should be easy
to start or stop when required.
10.NON SPONTANEOUS
COMBUSTION: Combustion of fuel
should be non-spontaneous
otherwise it can cause fire hazards.
33. 33
Let us discuss few multiple choice
questions
Que1.Agood fuel possess:
a. High ignition temperature
b. Moderate ignition temperature
c. High calorific value
d. Both (b) and (c)
Ans (d)
34. 34
Que2.An example of primary fuel is :
a. wood charcoal
b.Coke
c.natural gas
d.petrol
Ans. (C)
35. 35
Que3.The minimum temperature at
which substance ignites and burns
without further addition of heat from
outside is called:
a. ignition temperature
b.flash point
c.transition temperature
d.all the above
Ans (a)
36. 36
Que4.In a good fuel percentage of
carbon is:
a. low
b.high
c.moderate
d.zero
Ans(b)
37. 37
Que5.Combustion of fuel involves
chemical reaction between fuel and
a.Hydrogen
b.Nitrogen
c.Oxygen
d.Chlorine
Ans (c)
38. 38
Que6. The reaction in which heat is
absorbed is called
a. Exothermic
b.Endothermic
c.Exegonic
d.none of these
Ans (b)
39. 39
Que7.Fuel can be defined as a
substance which produces heat by
a. combustion
b.Reduction
c. None of these
d.All of above
Ans(a)
41. 41
Que9.Which of following constituent of
fuel does not contribute to its calorific
value?
a. hydrogen
b.sulphur
c.nitrogen
d. None of these
Ans(c)
42. 42
Que10.A good fuel should have
following characteristics:
a.Moderate ignition temperature
b. High calorific value
c.Low moisture content
d. all of these
Ans (d)