Question

The low pressure air entering into the extension grate is supplied to ______________ in the multi retort stoker.

(a) At incandescent zone

(b) Thinner fuel bed

(c) At inlet dampers

(d) At extension grate

This question was addressed to me during an interview for a job.

This interesting question is from Type of Stokers topic in portion Steam Power Plant of Energy Engineering

Answer 1

The correct option is (b) Thinner fuel bed

Easy explanation: The primary air is supplied from the main wind box to the fuel bed situated below the stoker. The partly burnt coal moves on to the extension grate. The low pressure air entering into the extension grate, wind from main wind box is supplied to the thinner fuel bed on the extension grate. The quantity supplied can be regulated by air damper.