Question

Which are the major types of boilers that are operated in world today?

(a) Natural circulation boiler

(b) Forced circulation boiler

(c) Fire tube boiler

(d) Once through boiler

I have been asked this question during an online interview.

I want to ask this question from Boiler Classification topic in section Steam Generators & Accessories of Energy Engineering

Answer 1

Right answer is (d) Once through boiler

The best I can explain: The once through boiler has higher load response characteristics due to the fact that it does not have drum and has much lower water inventory. Many times load change response is dictated by the firing system and its controls rather than the boiler, per-say.