Numerical Simulation of Solid Particle Erosion Behavior in Fixed Throttle Valve at Gas Well Head

The throttling effect of the wellhead fixed throttle valve will decrease or even fail under the erosion of gas-solid two-phase flow. The gas-solid flow in the valve was numerically simulated by computational fluid dynamics (CFD) software, and the internal flow field, erosion position and erosion rate of throttle valve were analyzed. The results show that the pressure decreased rapidly when the gas entered the valve core, and then continued to decrease after the pressure raised in the middle of valve core. The gas velocity first reached the maximum value quickly, and then gradually increased after the velocity decreased in the middle of valve core. The most serious erosion happened at the inlet of valve core and inside valve core, and the impact form exhibited a continuous point-like distribution. The erosion rate at the entrance of valve core was slightly lower than that inside valve core. The erosion rate at the inlet and inside of valve core reached the maximum when the inclination angle of fixed throttle valve was 45°. The further the inclination angle deviated 45°, the lower the erosion rate was.