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Which system was used before direct firing system in pulverized fuel firing?

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Which system was used before direct firing system in pulverized fuel firing?

(a) Unit system

(b) Burner and pulverizer system

(c) Bin system

(d) Pulverizer

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

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

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Right option is (c) Bin system

For explanation I would say: Bin system was widely used before pulverizing equipment became reliable enough for continuous steady operation. This system employs a limited number of large capacity pulverizes at a central point to prepare coal for all the burners.

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