Working Performance and Structure Optimization of Spindle-Shaped Axial Gas-Liquid Cyclone Separator

When circulating degassing or emergency blowout is required during oil and natural gas drilling, it is necessary to use separation equipment to separate waste gas, waste liquid, natural gas, or other impurities to avoid environmental pollution caused by the combustion of mixed fluids. In this paper, a structural scheme of spindle-shaped axial gas-liquid cyclone separator is proposed, and the Reynolds stress model (RSM) and DPM model are used to numerically simulate the gas-liquid two-phase flow, the flow field distribution law of the separator is obtained, the influence of structural parameters on the flow field is analyzed, and the multiobjective and multiparameter structure optimization research of the separator is carried out by orthogonal test method. Through the extreme difference analysis and ANOVA, the optimal level of separation performance of the separator was obtained by the combination of parameters B3A3C2, i.e., the combination of parameters with the outlet angle of 60 degrees, the number of blades of 6, and the ratio of the length of the separation chamber to the depth of the overflow pipe M of 0.4, and the design and optimized structure were verified by the field experiments. The results show that the velocity in the cyclone separator is approximately "M" type distribution, and the velocity decays gradually along the axial direction due to energy loss. With the increase of the inlet gas velocity, the tangential velocity in the separator increases, and the separation efficiency and pressure drop increase. At the same time, with the increase of particle diameter, the centrifugal force of particles increases, the number of particle "escapes" decreases, and the separation efficiency increases, but the particle diameter has little effect on pressure drop. After the optimization of the structure, the separation efficiency is improved, the pressure drop is also reduced, and the comprehensive working performance of the separator is significantly improved.