Drum Boilers



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

  • 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