| 摘要 |
PROBLEM TO BE SOLVED: To prevent the corrosion by sulfuric acid in a low temperature part of a steam generator while minimizing the reduction of power generation efficiency when using fuel containing sulfur. SOLUTION: When combustion gas as a heating fluid contains sulfur oxide, a part of condensate from a condensate pump 40 is supplied to a deaerator 28 by bypassing a preheater 26 of an exhaust gas boiler 14 by a bypass pipe passage 54, and condensate circulates into a heat exchanger inlet pipe passage 46 from a heat exchanger outlet pipe passage 47 through a circulation pipe passage 52 so that an inlet temperature to the preheater 26 for condensation is above a predetermined temperature determined by taking a dew point temperature of sulfur oxide into account.
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