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Fuels and Combustion

Fuels and Combustion
Largest constituent of blast furnace gas is

H₂
N₂
CO
CO₂

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Fuels and Combustion
Which of the following is a primary fuel?

Blast furnace coke
Gasoline
Natural gas
Wood charcoal

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Fuels and Combustion
Combustion of pulverised coal compared to the lumpy coal

Provides higher thermal efficiency & flame temperature
Facilitates combustion with lower excess air
All of these
Provides better control of furnace temperature

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Fuels and Combustion
Spontaneous combustion of coal on storage results due to

Low temperature oxidation
Storage in large heaps with small surface to volume ratio
All of these
Inadequate ventilation

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Fuels and Combustion
In low temperature carbonisation of coal, the

Yield of coke oven gas is 290 Nm³ /ton dry coal
Yield of tar is about 3% of dry coal
Temperature maintained is 700°C
Volatile matter in coke is zero

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Fuels and Combustion
Percentage of nitrogen in blast furnace gas may be around

80
5
25
55

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