Drum Boilers
Overview
In a drum boiler, the circulation of water is produced through the density difference of water in the down comer pipe and the water/steam mixture in the furnace tubes. 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 (BCP) is installed in the down comer pipe to supplement circulating force. The type that circulates water using only the density difference is called a natural circulation boiler, while the type that includes a pump is called a forced circulation boiler.
Natural Circulation Boiler Fluid Path Diagram
Forced Circulation Boiler Fluid Path Diagram
Delivery Records
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Forced Circulation Boiler
Customer BLCP Plant (Country) BLCP Power Station (Thailand) Output 717 MW Maximum continuous rating 2,285t/h Steam conditions Main steam temperature 538°C Reheat steam temperature 538°C Main 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 Main steam temperature 541°C Reheat steam temperature 541°C Main steam pressure 18.1 MPaA Fuel Natural gas, heavy oil Start of operation 2011