Fuel and Combusion

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Chapter No. 08 COMPARATIVE STUDY OF SOLID  COMPARATIVE STUDY OF SOLID LIQUID AND GASEOUS FUELS Dr. Noaman Ul‐Haq

Solid, Liquid and Gaseous Fuels  available Commercially l bl ll Solid Coals Cokes Briquetted Solid Pitch Coal Middling's Liquid Gasoline Kerosene Diesel Fuel Oils Fuel Oils Coal Tar Fuels Tar Gaseous Natural gas LPG Blast Furnace Gas Coke Oven Coke Oven Gas Producer Gas Coal gas

MAIN FACTORS FOR THE SELECTION  OF FUEL
A number of factors are to be considered  A number of factors are to be considered when a fuel or a type of fuel is chosen for a  particular purpose. The main factors are: • The price of the fuel delivered to the place  where it is required. • The efficiency of the heating operation with  selected fuel. • The ratio of the cost of heating operation to  the cost of the finished product

• The adverse effect of fuel on the quality of The adverse effect of fuel on the quality of  finished product. • Adequate storage space for the fuels should Adequate storage space for the fuels should  be available. • Th f l h The fuel chosen should achieve smokeless  h ld hi k l combustion.

SOLID FUELS SOLID FUELS
Advantages: d a tages: • It is Cheap. It occurs widely and easily available. • It occurs widely and easily available. • No complicated burning mechanism is needed  for it. • It can be Pulverized with flexibility of liquid  fuels. • Coal ash is free from vanadium compounds. • Sulphur content is less.

Disadvantages: • Lot of labour is required for moving solid fuel. • Enough space is required for its storage Enough space is required for its storage. • It has got ash and clinkering trouble. • Thermal efficiency is not so high. • Liable to undergo spontaneous combustion. • Coal deteriorates during storage causing  reduction ion size and calorific value.

LIQUID FUELS LIQUID FUELS
• • • • • • Advantages: Can be stored more compactly. Can be handled easily. Can be handled easily No ash and clinkering problems....
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