给水泵再循环系统介绍（Introduction of recirculating system of feed water pump）.doc

给水泵再循环系统介绍（Introduction of recirculating system of feed water pump） Recycling system of feed water pump.Txt life is too out, not out of thinking. Put it down once, not put the memory. No matter where I am, I leave you only turn around. The pump recirculation system A review In the process of thermal power plant, the power is on the water cycle (i.e. water from the water pump to the boiler, in the pot Steam heating furnace, gas turbine and steam in the expansion work after condensing into water, and so the cycle Reciprocating). To achieve. During the cycle, to achieve the safe operation of the pump is closed cycle Key. To the water pump is the change of boiler load and the. At startup or at very low loads, water pump Probably in a very small amount of water or water to zero in the case of running water, long-term by the impeller friction in the pump body. Fever, and increase the water temperature, water temperature rises to a certain extent, will vaporize, the formation of cavitation. Due to Pump damage. In order to prevent the occurrence of these phenomena in the pump outlet to the deaerator water tank (or condenser) Installed between the recirculation system when the pump is started or in a small amount of water to a certain extent, can open recycling Ring system. A portion of the water returns to the deaerator water tank, to ensure that there is a certain amount of water (usually around the rated flow 30%) through the water pump, and the pump water temperature and vaporization. When the water in normal condition When the closed recirculating system. The recirculation system by minimum flow valve, check valve, flow measurement system. Flow measurement system. System determines when the open or closed recirculation system; .. Check valve to allow only water to pump out, and does not allow water pump reverse flow back. To prevent the pump Suddenly stop functioning, the high-pressure water pump caused by pump reverse reverse back; I guarantee minimum flow valve in the