Question

What is the reason for using forced draft in multi retort stoker?

(a) Maintaining combustion for longer periods

(b) Helps in blowing away the ash and clinkers

(c) Causes rapid combustion

(d) Maintains the intensity of fire

This question was posed to me during an interview.

The doubt is from Type of Stokers in chapter Steam Power Plant of Energy Engineering

Answer 1

Correct option is (c) Causes rapid combustion

The best explanation: Forced draught causes rapid combustion. It is also necessary to introduce ‘over fire’ when high volatile coals are used to prevent the smoke formation. Combustion control is introduced into the stoker drive either by varying the ram stoke or by changing the rate of reciprocation.