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Which was first combustion system used for solid fuels?

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Which was first combustion system used for solid fuels?

(a) Firing stoker

(b) Tangential stoker

(c) Grate firing

(d) Pulverized fuel firing

I had been asked this question during an interview for a job.

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

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The correct option is (c) Grate firing

Easy explanation: Grate firing was the first combustion system used for solid fuels. It now is used mainly for burning waste and biomass, but also for smaller coal furnaces. Fuel fired per grate area is 1-2 MW/m^2, ad maximum grate area is 100m^2.

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