Question

The rate of steam generation in a water tube boiler in comparison to fire tube boiler is:

1. less
2. more or less the same
3.

more

4. equal

Answer 1

Correct Answer - Option 3 :

more

Concept:

Fire Tube Boiler	Water Tube Boiler
In this boiler, the hot flue gases are present inside the tubes and water surrounds them	In this boiler, the water is present inside the tubes and the hot flue gases surround them
They are low-pressure boilers. The operating pressure is about 25 bar	They are high-pressure boilers and the operating pressure is about 250 bar
The rate of steam generation and quality of steam is very low, therefore, not suitable for high power generation	The rate of steam generation and quality of steam is better and suitable for power generation
It requires more floor area for a given output	It requires less floor area for a given output
The overall efficiency of this boiler is up to 75%	The overall efficiency is up to 90% with the economizer
Water doesn’t circulate in a definite direction	Water circulates in a well - defined direction