Steam boilers

Water tube boiler

A water tube boiler consists of a large number of closely spaced water tubes connected to one or more drums, which act as water pockets and steam separators, giving rapid water circulation and quick steaming.

1. Smoke uptake
   
2. Economizer
   A heat exchanger that transfers heat from Boiler Flue Gases to Boiler Feedwater.
3. Steam Outlet
   Saturated steam from the Steam Drum to the Superheater
4. Cyclone
   A device inside the drum that is used to prevent water and solids from passing over with the steamoutlet.
5. Stay tube
   for superheater
6. Stays
   for superheater tubes
7. Superheated steam outlet
   
8. Superheater
   A bank of tubes, in the exhaust gas duct after the boiler, used to heat the steam above the saturation temperature.
9. Superheater Headers
   Distribution and collecting boxes for the superheater tubes.
10. Water Drum
    
11. Burner
    
12. Water wall Header
    Distribution box for Water wall and downcomers.
13. Foting
    
14. Water wall
    Tubes welded together to form a wall.  
    
15. Water wall Header
    Distribution box for Water wall and downcomers.
16. Back side Water wall
    
17. Boiler hood
    
18. Water wall Header
    Collecting box for Water wall and risers.
19. Riser
    The water-steam emulsion rises in these tubes toward the steamdrum.
20. Downcomer
    A tube through which water flows downward. These tubes are normally not heated, and the boiler water flows through them to supply the generating tubes.
21. Steam Drum
    Separates the steam from the water.
22. Economizer Header
    Distribution box for the economizer tubes.