Effect Of Gate Position On Gas-solid Two Phase Flow And Erosion Of Gate Valve

Gate valve is an important component of industrial pneumatic conveying pipeline system. In the practical application, due to the opening and closing of the valve, resulting in valve flow cross-section changes, and cause valve internal gas solid two phase flow field and the trajectories of motion of particles of different, resulting in different valve erosion rules. Therefore, this paper mainly studies the gate position changes, gate valve in the gas solid two-phase flow flowing resistance characteristics and internal flow field distribution, velocity distribution of solid phase particles and valve wall erosion characteristics, to optimize the gate valve structure, determine the valve wall erosion position, extend valve life and improve the delivery of material purity, reduces the leakage of pollutants to provide a good foundation for the application. The main contents are as follows:(1) In this paper, three-dimensional modeling for gate valve runner is completed by solid works software. In the experiment, processing out of the gate valve runner for gas-solid two phase flow experiment model, the flow coefficient, resistance coefficient and erosion distribution of the main wall were studied experimentally. In the numerical simulation, based on Eulerian-Lagrangia discrete phase analysis model, Reynolds Stress turbulence Model(RSM), particle wall collision model, erosion prediction model, gambit software is adopted to divide the flow passage of the gate valve, and the numerical simulation is carried out by FLUENT software, the inlet velocity 10 m/s, 14 m/s, 18 m/s, particle diameter 5μm, 50μm, 100μm, 200μm, 300μm, the gate position 1/8 ~ 1, gate valve flow resistance characteristics, flow field, particle velocity distribution, the main erosion wall erosion distribution was studied by numerical simulation.(2) By analyzing numerical simulation results, the effects of relative position of the gate, inlet velocity and particle diameter on the flow coefficient and resistance coefficient of gate valves were obtained. On this basis, it focuses on the relative position of the gate 1/8, 2/8, 4/8, 1, the different inlet velocity, different particle size on the valve pressure coefficient, pressure field, velocity field, pulse velocity, particle velocity distribution, and the main wall erosion distribution. Results show that gate position on the valve of the flow resistance characteristics, fluctuating velocity, particle velocity distribution, the main wall average amount of erosion has an important influence.(3) In order to verify the accuracy of numerical simulation,in this paper, the inlet velocity 18m/s, particle diameter100μm,the relative position of gate1/8, 2/8, 3/8, 4/8, 5/8, 6/8, 7/8, 1,when the gas-solid flow experiments conducted to verify the accuracy of the numerical simulation for the valve flow resistance characteristics and erosion prediction numerical simulation study provides feasibility.