Vacuum pump for power plant mainly includes centrifugal vacuum pump and liquid ring vacuum pump. Their working principles are similar, but their implementation methods are different. Liquid ring vacuum pump is widely used in civil engineering construction because of its safety, simple operation, economy, reliable operation, small dynamic and static contact area, oil-free lubrication, low operating noise and compact structure. Only by connecting the pipeline, gas source and power supply can it be put into commercial operation, which saves a lot of liquid resources.
Liquid ring vacuum pump has axial suction and exhaust and radial suction and exhaust. The advantages of axial suction and exhaust are simple structure, convenient maintenance, and the disadvantages are large hydraulic loss and low pump efficiency. The advantages of radial intake and exhaust are small hydraulic loss and high pump efficiency; the disadvantages are complex structure of gas distributor and high processing and installation accuracy. Foreign manufacturers of complete vacuum pump equipment mainly include American Nash company and German Siemens company;
It is the supporting equipment for the production of domestic steam turbine generator set. The operation practice shows that the domestic equipment can replace the imported equipment, and the domestic equipment has a greater price advantage than the imported equipment. Due to the advantages of performance and price, liquid ring vacuum pump system is not only widely used in 300, 600 MW and above units, but also widely used in many high-pressure and ultra-high pressure small and medium-sized units in recent years, replacing the original liquid injection and extraction system, bringing long-term benefits to power plants.
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