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Fuels and Combustion

Fuels and Combustion
Mineral matter content (M) and ash content (A) in coal are approximately related as

M = 2A
M = A
M = 1.5A
M = 1.1A

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Fuels and Combustion
The main function of primary air in pulverised coal fired burner is to

Dry and transport the coal
Have proper combustion by supplying it around the burner
Preheat the tertiary air used for complete combustion of CO to CO₂
Burn CO to CO₂

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Fuels and Combustion
Use of pulverised coal in boiler furnace provides

High calorific value
Less erosion on furnace walls
Smokeless burning
Better combustion

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Fuels and Combustion
Coke oven gas compared to blast furnace gas is

More explosive and inflammable
Lighter
Less poisonous
All of these

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Fuels and Combustion
High sulphur content in a fuel __________ of the flue gases.

Decreases the dew point
Reduces the combustion efficiency by limiting the permissible temperature reduction
Increases the dew point
Both B & C

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Fuels and Combustion
Advantages of fluidised bed combustion are

High heat transfer rate
All of these
Lower furnace operating temperature
Reduced NOx formation in flue gas

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