Babcock and Wilcox boiler

Babcock and Wilcox is a water-tube boiler is an example of horizontal inclined tube boiler it also a High Pressure Boiler.

Characteristic:

1. Horizontal Boiler
2. Muli tube Boiler
3. Water tube Boiler
4. Straight tube Boiler
5. Externally Boiler
6. Multi tube Boiler
7. Natural draft Boiler
8. Natural circulation Boiler
9. Coal fired Boiler
10. Stationary Boiler
11. Low & Medium pressure Boiler

Construction: Babcock and Wilcox boiler with longitudinal drum. It consists of a drum connected to a series of front end and rear end header by short riser tubes. To these headers are connected a series of inclined water tubes of solid drawn mild steel. The angle of inclination of the water tubes to the horizontal is about 15° or more.

Working: The fire door the fuel is supplied to grate where it is burnt. The hot gases are forced to move upwards between the tubes by baffle plates provided. The water from the drum flows through the inclined tubes via down take header and goes back into the shell in the form of water and steam via uptake header. The steam gets collected in the steam space of the drum. The steam then enters through the antipriming pipe and flows in the superheater tubes where it is further heated and is finally taken out through the main stop valve and supplied to the Steam turbine or Steam engine when needed.

The pressure of steam in case of cross drum boiler may be as high as 100 bar and steaming capacity upto 27000 kg/h.At the lowest point of the boiler is provided a mud collector to remove the mud particles through a blow-dawn-cock.
Advantages:

1. It uses both solid as well as liquid fuel for burning.
2. The drought losses as compared to other boiler in minimum.
3. As compared to other boiler the evaporation capacity is high.
4. The circulation of water is natural.
5. The defective tubes can be replaced easily.
6. It is used in power stations for generation large quantity of steam.