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How is that using the pulverized system causes less trouble?

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How is that using the pulverized system causes less trouble?

(a) Rate of combustion is high

(b) The operation is very quick and easy

(c) No moving part in furnace

(d) By using pulverized fuel system is totally free from slagging or clinker formation

The question was posed to me during an interview for a job.

This interesting question is from Pulverised Fuel Burning in chapter Steam Power Plant of Energy Engineering

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Right option is (c) No moving part in furnace

The explanation is: There are no moving parts in the furnace, subjected to high temperature therefore the life of the system is more and the operation is trouble free. The boilers can be started from cold very rapidly and effectively. The external heating surface is free from corrosion and fouling as smokeless combustion is possible.

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