This document discusses boilers and their accessories. It describes the Scotch boiler and Lancashire boiler. It then focuses on explaining the Babcock and Wilcox boiler, noting that it is a horizontal, externally fired, natural circulation boiler. It lists some key boiler accessories like economizers, air preheaters, and superheaters; and explains their functions of heating feedwater, air, and wet steam respectively to improve boiler efficiency.

1. BOILERS
Babcock and Wilcox
construction
working
Boiler Accessories
by
Dr Vishaldatt Kohir
Professor
Subject: Basic Mechanical Engineering
Module 2
Part 3

2. Scotch boiler
Lancashire boiler
Recap

3. It is a horizontal, externally fired,
natural circulation, stationary
,water tube boiler.
Construction, working of Babcock and Wilcox boiler

4. https://www.youtube.com/watch?v=dPllyDCYBKI
View the clip using below link and resume this video

5. What is the function header ?
Why baffles are provided?
Thermo-Siphon effect helps in____
_____of water
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Questions?

6. Bike Accessories

7. Economizer (Feed water heater)
Feed water is heated by outgoing flue gases
Air preheater
Air required for the combustion is heated by
outgoing flue gases
Super heater
Heats wet steam to produce super heated steam
Feed water pump
Supply water to boiler equal to steam produced
Boiler Accessories

8. waterWater
Steam
Fuel + Air
Steam
ChimneyFlue gases
Economizer /Feed water heater

9. water
Water
Steam
Fuel + Air
steam
Air Pre heater

10. water
Water
Steam
Flue gases
Wet steam
combustion
Super heater
Super
heated
steam

11. Boiler accessories are devices which are attached to
increases efficiency and overall performance
boiler/plant