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Which type of coal is used in the under feed system?

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Which type of coal is used in the under feed system?

(a) Anthracite coal

(b) Bituminous coal

(c) Briquette coal

(d) Pulverized coal

I got this question in an online interview.

My question is from Principle of Stoker topic in division Steam Power Plant of Energy Engineering

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The correct option is (b) Bituminous coal

The best explanation: The under feed method uses bituminous coals which have high volatile matter. The volatile matter gets heated to a high temperature as it passes through incandescent region of coal. The volatile matter being at a high temperature before entering the furnace burns quickly when mixed with secondary air.

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