Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Unit-4: Fuels & Combustion

Mr. Santosh Damkondwar
Monday, January 20, 2014
Introduction
•

Fuels

•

Non-renewable Conventional Sources

•

In Mechanical, Electrical & Chemical operations.
Characteristics of Good Fuels:
•
•
•
•
•
•
•
•
•

High Calorific Values
Moderate Ignition Temperature
Low Moisture Content...
Classification

•

Natural or Primary Fuels

Solid
e.g.
Wood, Peat,
Lignite,
Bituminous
Coal, Dung

Liquid
e.g.
Crude Oil,...
Classification

Solid
e.g.
Coke,
Charcoal,

Liquid
e.g.
Tar,
Kerosene,
Diesel,
Petrol,

Gaseous
e.g.
Coal Gas,
Water Gas,
...
Calorific Values:

•

Calorific Value of fuel is the total quantity of heat
liberated by complete combustion of a unit mas...
Calorific Values
Calorific Values:

•

Calorific Value of fuel is the total quantity of heat
liberated by complete combustion of a unit mas...
Calorific Values
Calorific Values
Calorific Values
Higher Calorific Values:

•

It is the total amount of heat liberated, when unit
mass / volume of the fuel is burnt comple...
Lower Calorific Values:

•

It is the net amount of heat liberated, when unit
mass / volume of the fuel is burnt completel...
Relation between GCV & LCV:

•

These can be related as:

NCV = GCV – Latent heat of water vapor formed
or
= GCV – (Mass o...
Determination of Calorific Value:

•

Calorific Value of the fuel is determined by
heating known amount of fuel, in presen...
Upcoming SlideShare
Loading in …5
×

Unit 4 introduction to fuels and combustion

14,269 views

Published on

Introductory Part

Published in: Education, Technology, Business
  • Be the first to comment

Unit 4 introduction to fuels and combustion

  1. 1. Unit-4: Fuels & Combustion Mr. Santosh Damkondwar Monday, January 20, 2014
  2. 2. Introduction • Fuels • Non-renewable Conventional Sources • In Mechanical, Electrical & Chemical operations.
  3. 3. Characteristics of Good Fuels: • • • • • • • • • High Calorific Values Moderate Ignition Temperature Low Moisture Content Low Ash Content Moderate Velocity of Combustion Should not produce harmful products Low Cost Easy Storage & Transportation Easily Controllable
  4. 4. Classification • Natural or Primary Fuels Solid e.g. Wood, Peat, Lignite, Bituminous Coal, Dung Liquid e.g. Crude Oil, Vegetable Oil Gaseous e.g. Natural Gas
  5. 5. Classification Solid e.g. Coke, Charcoal, Liquid e.g. Tar, Kerosene, Diesel, Petrol, Gaseous e.g. Coal Gas, Water Gas, Bio-Gas
  6. 6. Calorific Values: • Calorific Value of fuel is the total quantity of heat liberated by complete combustion of a unit mass (or volume) of the fuel. • It can be expressed for Solid Fuels in terms of : Cal/gm (CGS Unit) Kcal/Kg (MKS Unit) J/Kg (SI Unit) B.Th.U. / lb (British Thermal Unit)
  7. 7. Calorific Values
  8. 8. Calorific Values: • Calorific Value of fuel is the total quantity of heat liberated by complete combustion of a unit mass (or volume) of the fuel. • It can be expressed for Gaseous Fuels in terms of : Cal/lit (CGS Unit) Kcal/m3 (MKS Unit) J/m3 (SI Unit) B.Th.U. / Ft3 (British Thermal Unit)
  9. 9. Calorific Values
  10. 10. Calorific Values
  11. 11. Calorific Values
  12. 12. Higher Calorific Values: • It is the total amount of heat liberated, when unit mass / volume of the fuel is burnt completely and the products of combustion have been cooled to room temperature (i.e. 15oC).
  13. 13. Lower Calorific Values: • It is the net amount of heat liberated, when unit mass / volume of the fuel is burnt completely and the products of combustion are allowed to escape.
  14. 14. Relation between GCV & LCV: • These can be related as: NCV = GCV – Latent heat of water vapor formed or = GCV – (Mass of Hydrogen × Latent heat of steam) = GCV – [(9 × Mass of hydrogen) × Latent heat of steam] If mass of hydrogen is expressed as % of H, then NCV = GCV – [9× H/100 × 587] cal/gm
  15. 15. Determination of Calorific Value: • Calorific Value of the fuel is determined by heating known amount of fuel, in presence of oxygen in calorimeter. • Principle o Total heat liberated by complete combustion of known amount of fuel is absorbed by the known mass of water in calorimeter. From the rise in temperature of water, the calorific value of fuel is determined.

×