Feed water heater
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United States of America Patent
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Jan 21, 2003
Grant Date -
N/A
app pub date -
Jan 17, 2002
filing date -
Jan 17, 2002
priority date (Note) -
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Abstract
A feedwater heater for a steam generator or heat recovery boiler or waste heat boiler through which hot gases pass includes two sections which are located side by side so that the temperature of the hot gases at the upstream face of each section is essentially the same. The feedwater flows through a heat exchanger before entering the first section, and here it is heated by water flowing from the upstream face of the first section to the downstream face of the second section. The arrangement is such that all tubes in the two sections remain above the dew point of the hot gases, so that water does not condense on the tubes and unite with oxides of sulfur to form sulfuric acid which will corrode the tubes, yet substantial temperature differentials exist between the water in the sections and hot gases as the gases pass through the sections.
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