Performance Prediction And Integrated Technology Of Twin-screw Helium Compressor

Twin-screw compressor has simple structure, less wearing parts, long maintenancecycle, high volume efficiency and low exhaust gas temperature. So it is widely used for avariety of national economic occasions such as oil production, natural gas production,industrial production, food processing and storage, air-conditioning and other public places.In addition, the twin-screw compressors are also used in large helium cryogenic system forlarge scale scientific facilities. Currently, only two companies in China have developed andproduced twin-screw helium compressors, which have a certain gap with the foreignproducts. In this study, twin-screw air compressor is studied on following aspects:1A twin-screw compressor mathematical model was established. On this basis, acomparison between air and helium was made in the course of the performancecharacteristics, explaining the reason that the twin-screw compressor volumetric efficiencyof helium and the adiabatic efficiency are low.2By using the method of finite element method (FEA), the heat deformation and theheat stress of the widely used materials in compressor carbon steel and Ductile iron underthe operating condition are calculated, The results provide suggestions for the twin-screwcompressor rotor selection and determination of the rotor assembly space.3Using Computational Fluid Dynamics method, the centrifugal oil-gas separatorapplied to twin-screw compressor is simulated. Based on the analysis of the two-phase flowfield, the velocity distribution rules of gas flow field and the physical mechanism of themovement of oil droplet are revealed. Meanwhile, the separation efficiency of oil-gasseparator is calculated, and the factors which influence the separation efficiency arediscussed.