Question

What is necessary to ensure products of combustion flow into the chimney?

(a) Air speed

(b) Draft in the chimney

(c) Differential gas pressure

(d) Swirl flow of exhaust air

I have been asked this question during an interview.

My doubt stems from Principle of Automatic Control of Combustion in division Steam Power Plant of Energy Engineering

Answer 1

Right choice is (c) Differential gas pressure

To elaborate: In order to ensure products of combustion flow into the chimney at proper speed, it is essential to regulate differential gas pressure in the furnace. In case of automatic control, the controlling devices operate based on the change in pressure of steam.