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Fuels and Combustion

Fuels and Combustion
Which of the following coke has the least percentage of ash?

Petroleum coke
Foundary coke
Beehive coke
Metallurgical coke

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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

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

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Fuels and Combustion
Stack heat losses can be minimised by

Maintaining proper draft in the furnace
Oxygen enrichment of combustion air
Controlling the excess air
Using low c.v. fuels

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Fuels and Combustion
Too much of excess air in combustion results in high

All of these
Percentage of oxygen in flue gases
Fuel consumption for the same heat load
Stack gas temperature

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Fuels and Combustion
Ignition temperature decreases progressively from anthracite to lignite, because

Volatile matter content increases
Ash content increases
Moisture content increases
Carbon content decreases

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Fuels and Combustion
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

27.6
42.9
23
47.3

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