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The loss due to hydrogen in the fuel arises because the hydrogen

  • A.displaces oxygen from the combustion air
  • B.reduces the flame temperature and so the heat transfer
  • C.burns to water, whose latent heat leaves up the stack
  • D.fails to burn completely at ordinary furnace temperatures

Answer: C

Nine kilograms of water are formed for each kilogram of hydrogen, and its latent heat is carried away as vapour unless the flue gas is condensed. It is unavoidable in an ordinary boiler and is the difference between the gross and net calorific bases.

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