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BoilersDrum Boilers

Overview

In a drum boiler, the circulation of water is produced through the density difference of water in the downcast pipe and the water/steam mixture in the furnace water-wall. In low-pressure boilers where this density difference is large, the circulating force is high and a high volume of circulation can be ensured, but since it becomes difficult to maintain sufficient circulation volume when the density difference between the two drops due to higher pressure, a pump is installed in the downcast pipe to supplement circulating force. The type that circulates water using only the density difference is known as a natural circulation boiler, while the type that includes an installed pump is known as a forced circulation boiler.

Natural Circulation Boiler Fluid Path Diagram (Simplified)
Forced Circulation Boiler Fluid Path Diagram (Simplified)

Delivery Records

Forced Circulation Boiler

Customer
BLCP
Plant (Country)
BLCP Power Station (Thailand)
Output
717 MW
Maximum continuous rating
2,285t/h
Steam conditions
(superheater outlet)
Steam temperature
538°C
Reheat steam temperature
538°C
Steam pressure
16.7 MPaA
Fuel
Bituminous coal
Start of operation
2006

Natural Circulation Boiler

Customer
Cairo Electricity Production Company
Plant (Country)
Cairo West Power Station Units 7 and 8 (Egypt)
Output
350 MW
Maximum continuous rating
1,094t/h
Steam conditions
Steam temperature
(superheater outlet)
541°C
Steam temperature
(reheater outlet)
541°C
Steam pressure
18.1 MPaA
Fuel
Natural gas, heavy oil
Start of operation
2011

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