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Which type of draught system is used in the pulverized fuel firing system?

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Which type of draught system is used in the pulverized fuel firing system?

(a) Forced draught

(b) Balanced draught

(c) Induced draught

(d) Natural draught

I had been asked this question in an interview for job.

Question is taken from Pulverised Fuel Handling in chapter Steam Power Plant of Energy Engineering

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The correct answer is (c) Induced draught

To elaborate: Induced draught system is used in pulverized fuel firing system. The primary air from the Induced draught fan carries pulverized coal from the mill to the burner through short delivery pipe. In the separator, the big coal particles are separated from the fine dust these again fall down into the mill.

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