摘要
以多相流输送球阀为研究对象,对其颗粒冲刷磨损和电化学腐蚀开展数值计算研究.针对稀硫酸携带固体颗粒冲刷腐蚀球阀导致其失效的问题,采用欧拉-拉格朗日流体计算方法,运用Fluent软件对气固液三相流球阀冲刷腐蚀磨损进行数值模拟计算,揭示球阀冲刷腐蚀磨损失效机制,并将模拟计算结果与现有文献的实验数据以及工程现场冲蚀球阀对比,验证数值计算结果的准确性.分析结果表明:球阀内部流速为2～9m/s,阀芯最大冲蚀量为2.85×10-3kg/(m2·s),最大腐蚀率为2.28×10-7 kmol/(m2·s),阀内冲蚀磨损随开度的增大而减小,气相对球阀冲蚀影响微小,但阀芯内复杂的涡流减缓阀芯内侧壁面腐蚀率.颗粒的冲蚀与电化学腐蚀的交互作用会加快球阀表面镀层失效.
Abstract
The particle erosion wear and electrochemical corrosion of multi-phase flow ball valve were studied numerically.Aiming at the problem of ball valve erosion and corrosion caused by solid particles carried by dilute sulfuric acid,Euler-Lagrange fluid calcula-tion method was adopted to conduct numerical simulation of erosion and corrosion wear of gas-solid-liquid three-phase flow ball valve by using Fluent software,revealing the failure mechanism of valve erosion and corrosion.The simulation results were compared with ex-isting literature experimental data and the erosion ball valve on the engineering site.The accuracy of numerical calculation results is ver-ified.The analysis results show that:the flow rate in the ball valve varies from 2 m/s to 9 m/s,the maximum erosion amount in the valve is 2.85×10-3 kg/(m2·s),and the maximum corrosion rate is 2.28×10-7 kmol/(m2·s).The erosion wear in the valve decreases with the increase of the opening degree.The influence of gas phase on the erosion of the ball valve is slight,but the complex eddy current in the valve core slows down the corrosion rate of the inner wall of the valve core.The interaction between particle erosion and electrochem-ical corrosion will accelerate the failure of ball valve surface coating.
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