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The energy cost of blowdown is the heat contained in the

  • A.steam raised from the remaining water
  • B.feedwater admitted to replace it
  • C.flue gas leaving the boiler
  • D.hot water discarded

Answer: D

Water at boiler pressure carries several hundred kilojoules a kilogram of sensible heat, and discarding ten per cent of the feed throws away a corresponding share of the fuel. A flash vessel and a heat exchanger recover much of it.

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