Erosion behavior and it's consequences of valve core incoming surface for floating ball valve in gas distribution station
In order to avoid sudden safety accidents caused by high operating load and continuous erosion of gas-carried dust of floating ball valves widely used in gas distribution stations,the Ahlert erosion rate model was adopted to simulate and analyze the change trend of impact angle of the incoming surface of 304 stainless valve core at 30° opening using numerical calculation theory and method.The reliability of the numerical simulation results was verified by experiments.The erosion behavior and weak areas on the incoming flow surface of the valve core were scientifically evaluated.The results show that the impact angle of dust at 9 locations from point A to I on the incoming surface of the valve core increases synchronously with the wall thickness loss,and the incoming surface is continuously eroded and leaves some dents,resulting in the dust velocity on the incoming surface dropping from 7.4 m/s to 5.9 m/s.The surface dust flow speed decreases from 0.010 kg/s to 0.005 kg/s after erosion of the incoming surface,and the area of particle deposition also moves to the rear of the ball.The wall thickness thinning rate varies for each location on the incoming surface.Anti-erosion coating should be arranged accordingly,and the service life of ball valve under throttling condition should be evaluated by this dynamic method.
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