Question

In which direction does fuel, coke and ash in fuel bed move with respect to air and gases in overfeed system?

(a) Upward direction

(b) Same direction

(c) Opposite direction

(d) Downward direction

I had been asked this question during a job interview.

This is a very interesting question from Principle of Stoker in division Steam Power Plant of Energy Engineering

Answer 1

Correct choice is (c) Opposite direction

For explanation I would say: Fuel, coke and ash in the fuel bed move in the direction opposite to that of air and gases. The primary air entering from the bottom cools the ash until it finally rests in a plane immediately adjacent to the grate.