Question

What is the pulverization capacity of the ball mill?

(a) 10 tons of coal per hour

(b) 20 tons of coal per hour

(c) 50 tons of coal per hour

(d) 80 tons of coal per hour

I got this question in a job interview.

I want to ask this question from Pulverised Mills in section Steam Power Plant of Energy Engineering

Answer 1

Correct option is (a) 10 tons of coal per hour

The best explanation: A ball has the capacity of pulverizing 10 tons of coal per hour containing  4% of moisture requires 28 tons of steel  balls and consumes 20 to 25 KW hr energy per ton of coal. A wide range of fuels including anthracite and bituminous coal which are difficult pulverize, can still be used.