The Analysis And Reserch On Export Check Valve’s Characteristics Of Rotor Oil-Gas Mixture Pump

Oil-gas mixing transmission is one of the advanced technology of oil exploitation. It is important to improve the level of oil exploitation in our country, to lower the cost of project investment and oil gas drilling, to increase production of crude oil, to recover natural gas, and to protect environment and so on.Rotor oil-gas mixture pump is important equipment to oil-gas mixing transmission. The pump has internal compression function and good performance which added a group of unidirectional ball valves in the export. At present, there is no design theory and technical reports on rotor oil-gas mixture pump. In order to get the work characteristics on export check valve of new rotor oil-gas mixture pump, the valve’s lag angle, the differential equations of motion and the flow field in valve were analysed and numerically simulated. And the work characteristics of the pump valve were got. The research provides technical support for the pump valve further analysis and optimization design.The mainly work and results of this article are as follows.1. A formula for solving lag angle was set up. The important factors affecting the pump valve lag angle were analyzed. Using the knowledge of geometry and engineering thermodynamics to set up a formula for solving lag angle. Based on the formula that the lag angle and gas liquid ratio have proportional relationship, the formula’s ratio is determined by the size of rotor, the size of ball valve, the density of ball, the inlet and outlet pressure of pump and the specific heat of gas phase. Moreover, the influence of the lag by compression ratio was analyzed. It can be know that in order to weaken the influence of gas liquid ratio on lag angle by reducing the pump’s compression ratio. These conclusions provide reference to reduce the lag angle.2. The calculation on power consumption of rotor pump was deduced. Through the analysis of compression process power consumption of the rotor oil-gas mixture pump, the influence law of the different compression ratio to pump input power was obtained. Analysis result provides basis for the select of the compression ratio.3. The ball valve movement differential equation was established. According to the work principle of rotor oil-gas mixture pump and the reciprocating ball valve theory, the differential motion equations of export one-way ball valve in the pure liquid condition were deduced. An example was analyzed, then the ball valve lift curves and speed curves were got by using the MATLAB software.4. The internal flow field numerical simulation of ball valve was made. The pressure and velocity of different open heights and different gas liquid ratio were obtained by using CFD software, and the influence of different open heights and different gas liquid ratio to velocity of the gap was analyzed. In addition, the lift curves of ball valve with different materials were got by using the dynamic simulation. The simulation results can provide reference for the choice of the pump valve limit lift and material selection of ball valves.