| 摘要 |
PROBLEM TO BE SOLVED: To prevent the corrosion of heat transfer tubes in a fuel economizer caused by the dew condensation of acidic moisture in exhaust gas, particularly to carry out energy saving and the reduction of facility cost, and to prevent a water hammer phenomenon in water supply piping. SOLUTION: A recirculation passage 28 provided with the reheat boiler 2, an evaporator 10, the fuel economizer 12, and a water supply pump 24 is formed for recirculating supply water heated by the fuel economizer from the outlet side of the fuel economizer to the inlet side of the water supply pump. A heat exchanger 26 provided for carrying out heat exchange between supply water flowing in a water supply passage, and the supply water flowing in the recirculation passage and heated by the fuel economizer is interposed in each of the recirculation passage and the water supply passage between the water supply pump and the fuel economizer. A circulation water flow control means 30 provided for carrying out the flow control of the supply water flowing in the recirculation passage is interposed in the recirculation passage at the downstream side of the heat exchanger. COPYRIGHT: (C)2007,JPO&INPIT
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