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To improve the thermal
efficiency of combustion equipment it is necessary to cool the flue
gas to a low outlet temperature,to recover as much heat as
possible. But the temperature must not be so low as to allow sulphur
from the fuel to condense as sulphuric acid, resulting in a very corrosive flue gas.
The two graphs below indicate the maximum flue gas dew point versus
sulphur content in typical fuels.
Maximum flue gas dew point versus percent sulphur in typical oil
fuels:
Maximum flue gas dew
point versus percent H2S in typical gas fuels:
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