Hydrocyclone Of Petroleum Drilling Mud Purification Research And Application

For the hydrocyclone as the second purification equipment of petroleum drilling system has the problems of low separation efficiency and easy wear out, this paper combined basic theories with advanced computer dynamic technology to simulate the working process of hydrocyclone. This paper analyzed the3D inner flow field, achieved separation efficiency and the erosion of the hydrocyclone wall.The separation efficiency of hydrocyclone was affected by structure factors. In order to optimize the hydrocyclone structure, chose the hydrocyclone which diameter is100mm as the research subject. The inlet structure (traditional tangent inlet, gradually expanding type inlet, guide plate inlet, symmetric inlet and Archimedes spiral inlet), the depth of overflow pipe, the thickness of overflow pipe, the length of cylindrical and the cone angle was considered as the structure factors. Each factor has5different values. This is a five factors and five levels orthogonal test. After25times simulation of different structure combination, achieved every structure’s separation efficiency. With orthogonal analysis, the order of separation efficiency influence and the optimal combination can be achieved. The erosion of hydrocyclone was caused by particle collision. Discrete Phase Model and Erosion Model were used to forecast the wearing position.The results shows that the structure factors affect the separation efficiency aren’t monotone increasing or decreasing. The order of influence to separation is the inlet structure, the cone angle, the length of cylindrical, the depth of overflow pipe, the thickness of overflow pipe. The optimal combination is the Archimedes spiral inlet, the thickness of overflow pipe is18mm, the depth of overflow pipe is130mm, the length of cylindrical is150mm and the cone angle is10degree. The Archimedes spiral inlet hydrocyclone’s inner flow field is evener, the forced vortex and turbulence kinetic energy is smaller. The Archimedes spiral inlet hydrocyclone can guide and accelerate the mixture flow and increase the separation efficiency. The erosion positions focus on the cone zone. The maximum erosion is in the cone too. The Archimedes spiral inlet hydrocyclone has smaller erosion than traditional tangent inlet hydrocyclone and the erosion position is evener. The Archimedes spiral inlet hydrocyclone can decrease erosion effectively.