Select the correct statement regarding coal-fired boilers.

Question

Question

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SSC JE Electrical 06 Jun 2024 Shift 2 Official Paper - 1

Water-tube boilers are less expensive compared to fire-tube boilers.
Water-tube boilers are more efficient than fire-tube boilers.
Fire-tube boilers are typically used for high-pressure applications.
Fire-tube boilers have higher thermal efficiency compared to water-tube boilers.

Answer 1

Explanation:

Water Tube Boiler:

F1 Ashik Madhu 14.08.20 D23

When water is contained inside the tubes (called water tube) which are surrounded by flames and hot gases from outside, then the boilers are named as water tube boilers.
They are safe, quick steaming, flexible in construction and operation.
These boilers are extensively used because they can be built for high pressure and large evaporative capacities.

Types of Water Tube Boilers

Fire Tube Boiler:

F4 Savita Engineering 20-4-22 D1

When the flames and hot gases, produced by combustion of fuel, pass through the tubes (called multitube) which are surrounded by water, then the boilers are named as fire tube boilers.

Types of Fire Tube Boilers:

Comparison between Fire tube boilers and water tube boilers:

Sl no.	Particular	Fire tube boilers	Water tube boilers
1	Mode of firing	Internally fired	Externally fired
2	Rate of steam production	Lower	Higher
3	Construction	Difficult	Simple
4	Floor area	More	Less
5	Operating pressure and temperature	Lower	Higher
6	Treatment of water	Not so necessary	More necessary
7	Overall efficiency	around 75%	around 90%
8	Transportation	Difficult	Simple
9	Shell diameter	Large	Small for the same power
10	Explosion	Less	More