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Which fuel is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber?

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Which fuel is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber?

(a) Charcoal

(b) Anthracite

(c) Coke

(d) Briquette coal

I had been asked this question in semester exam.

This is a very interesting question from Artificial Solid Fuels & Liquid Fuels in section Steam Power Plant of Energy Engineering

1 Answer

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Best answer
Right choice is (c) Coke

To explain: Coal is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber in the absence of air 500^oC to 700^oC. During this process the volatile matter is removed from the coal, leaving a dull black color to coke. It is a hard porous structure and smokeless. It contains 85 to 95% carbon. When the bituminous coal is heated between 900^oC to 1000^oC, hard coke is produced. It is used in gas producing plants and blast furnaces.

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