| 摘要 |
PURPOSE:To allow a single unit of pump to perform a feed water supplying operation and to remove a flush which can take place at an area close to a suction port of the pump, by extracting a water of intermediate pressure from an intermediate stage of one type of feed water pump and by supplying such a water into a waste heat recovery boiler as a feed water other than a maximum pressure water. CONSTITUTION:A multi-stage feed water pump 18 has its delivery port 18a of final stage connected with a high pressure drum 9 via economizers 19, 7 for a high pressure zone and a high pressure feed water valve 8. An extraction outlet 18b of an intermediate stage is connected with a low pressure drum 5 via an economizer 3 for a low pressure zone and a low pressure feed water valve 4. A suction inlet 18c of feed water pump 18 is connected with a condenser 1. Since one type of feed water pump 18 can supply the feed water both to the high pressure drum 9 and the low pressure drum 5, money investment for equipments are greatly saved. Moreover, the feed water pump 18 can suck a low temperature condenser outlet water directly from the condenser 1 and therefore a risk of causing a flush at a suction port can be got rid of. |
