What is the advantage of using flue gas inside a boiler?
(a) Heats up boiler water tube quickly
(b) Reduces the amount of amount of exhaust
(c) Speeds of the process of boiler
(d) Reduces the green house of effect
I got this question in final exam.
This intriguing question comes from Cooling Water System, Air & Fuel Gas System topic in section Steam Power Plant of Energy Engineering