Question

On which factor is the coal fed to the pulverizing mill in pulverized fuel firing system?

(a) Steam generating rate

(b) Capacity of intake of coal

(c) On the rate of speed of the feeder

(d) Depending on the temperature that is governed inside the combustion chamber

I got this question during an interview for a job.

My question is from Pulverised Fuel Handling in chapter Steam Power Plant of Energy Engineering

Answer 1

Correct answer is (a) Steam generating rate

Best explanation: The feeder supplies coal too the pulverizing mill after drying coal in hot air. It is supplied at a variable rate governed by the combustion requirements of furnace and steam generating rate. In the pulverizing mill the coal is crushed to the required size (fine powder).