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A waste heat recovery boiler is fitted where the waste stream is

  • A.at a temperature below a hundred degrees
  • B.contaminated and unsuitable for a heat exchanger
  • C.intermittent and available for only part of the shift
  • D.hot enough and large enough to raise useful steam

Answer: D

Furnace and engine exhausts at several hundred degrees will raise steam at a useful pressure, which is why they are the classic application. A low-grade stream is better used for space or water heating, and an intermittent one may not justify the plant.

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