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Fuels and Combustion

Fuels and Combustion
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as

SO₂
CO
N₂
O₂

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Fuels and Combustion
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

Incomplete combustion of coal
Chances of clinker formation
Requirement of large volume combustion chamber
Risk of explosion

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Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Remains same
Decreases
May increase or decrease ; depends on the type of fuel
Increases

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

Aromatic content of tar is low
Calorific value of the coke oven gas is lower
H₂ content in the coke oven gas is more
Yield of ammonia is less

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Fuels and Combustion
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

1
2
6
4

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Fuels and Combustion
Largest constituent of blast furnace gas is

CO
CO₂
H₂
N₂

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