| 摘要 |
PURPOSE:To enhance heat recovery efficiency in a boiler by installing a heat recovery/heat exchanger on the downstream side of heating combustion gas generated by a super high-temperature/high-pressure steam boiler and supplying the heated water of high temperature obtained from the heat exchanger to a flush tank in order to generate steam by reduced pressure boiling. CONSTITUTION:Super high-temperature/high-pressure steam generated in a boiler 1 is guided through a super high-pressure turbine 2, a reheater 17, a high pressure turbine 3, the reheater 17, an intermediate turbine 4, a low pressure turbine 5, a condenser 6 in that order, while condensed liquid obtained in the condenser 6 is guided to return to the boiler 1 via a low pressure feed water heater 8, an air extractor 9, a high-pressure feed water heater 13. In this case, a heat recovery/heat exchanger 21 is installed in the downstream side of combustion gas and neighboring to a fuel economiser 14 of the boiler 1, while a part of feed water is led to the heat exchanger 21 and heated via a feed water pipe 22 branched from a delivery port of a pressure raising pump 10. The heated water thus obtained here is sent to a flush tank 25 to generate steam that is used to drive a feed water pump driving steam turbine 12. |
