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Fuels and Combustion

Fuels and Combustion
Coal tar (produced by high temperature carbonisation) is the main source of

Alphatic compounds
Paraffins
Olefins
Aromatic compounds

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Fuels and Combustion
In high temperature carbonisation of coal compared to low temperature carbonisation

Yield of ammonia is less
Aromatic content of tar is low
Calorific value of the coke oven gas is lower
Hâ‚‚ content in the coke oven gas is more

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Fuels and Combustion
Fuel consumption in coke making can be reduced by

Stamped charging of coal
Dry quenching of coke
All of these
Preheating, blending and de-ashing the coal

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Fuels and Combustion
Safe condition for storage of high V.M. bituminous coal is that

Maximum 200 tons should be stored in a heap
Height of the coal heap should be < 3 metres
Neither A nor B
Both A and B

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Fuels and Combustion
Caking index of coal blend used for blast furnace coke making is about

36
22
8
12

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Fuels and Combustion
With increase in moisture content of coal, its

Clinkering tendency during combustion increases
Bulk density always decreases
None of these
Calorific value increases sometimes

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