Select the correct statement regarding coal-fired boilers.

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

Answer (Detailed Solution Below)

Option 2 : Water-tube boilers are more efficient than fire-tube boilers.
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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

  • Babcock and Wilcox boiler
  • Stirling boiler
  • Lamont boiler
  • Benson boiler
  • Loeffler boiler, etc.

     

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:

  • Simple vertical boiler
  • Lancheshire boiler
  • Cochran boiler
  • Locomotive boiler

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
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