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How can we increase the rate of combustion of solid fuel?

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How can we increase the rate of combustion of solid fuel?

(a) By storing it in the right conditions

(b) By the process of pulverisation

(c) By removing the impurities present in it

(d) By blending of coal

The question was asked during an internship interview.

Question is taken from Pulverised Coal in portion Fuels and Combustion of Engineering Chemistry II

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Correct answer is (b) By the process of pulverisation

Explanation: The rate of combustion can be increased by bringing the air in contact with the fuel. The coal powder is pulverised from 75-85% below 74µm. Blending of coal produces a good quality of coal. The impurities are somewhat useful.

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