AP1000核电厂脱气塔真空泵运行特性研究

Operation Characteristics of Vacuum Pump Dedicated to Degassing Tower at AP1000 Nuclear Power Plant

对AP1000核电厂脱气塔真空泵,在不同工况下的电流特性进行了试验研究。分析了泵的背压,泵抽取的气体流量,泵抽取气体的种类对泵的运行电流的影响。结果表明泵的背压越高泵的运行电流越大,并且存在一个峰值背压,使得泵的电流阶跃上升,造成泵过载。同时随着泵的流量的增加,运行电流缓慢上升;真空泵背压一定情况下,抽取不同种类气体的运行电流相同。

Here,we experimentally addressed thespecial operation environment of the vacuum pumps,dedicated to the degassing tower at AP1000 nuclear power plant. The influence of the working conditions,including the back pressure,type and flow-rate of the pumped gases,on the operating current of the vacuum pump was investigated. The results show that the current depended strongly on the back pressure,but weakly on the flow-rate. For example,as the back pressure increased,the current slowly increased to the rated-current（ below 98 kPa） and rapidly shot up（ above 210 kPa） to overload the pump,suggesting an upper limit of the back pressure around 100 kPa; the current slowly increased with an increasing flow-rate. The gas type was found to little affect the current. We suggest that the back pressure should be controlled below the upper limit in the pumping of the degassing tower.