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How is volatile matter of raw coal is lost in the overfeed system?

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How is volatile matter of raw coal is lost in the overfeed system?

(a) Condensation

(b) Distillation

(c) Combustion

(d) Evaporation

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I'm obligated to ask this question of Principle of Stoker topic in section Steam Power Plant of Energy Engineering

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The correct choice is (b) Distillation

Easiest explanation: Raw coal that is continuously supplied on the surface of the bed loses it volatile matter by distillation in this zone. The required for the distillation of coal is given by incandescent coke below the fresh fuel, hot gases diffusing through the surface of the bed and hot gases and flame in the furnace above.

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