中文摘要：

基于有限容积法,采用K-ε双方程湍流模型和Mixture多相流模型,对高压差高固态浓度流体冲蚀极端工况条件下工作的煤液化减压阀阀体内的压力分布和流场状态进行了计算流体动力学分析,研究了新型结构减压阀在不同开度下压降的变化情况,以及不同阀座孔深度下湍流强度的变化情况.结合流体冲蚀理论,完成了对其结构的优化改进,并对易磨损部位做出了精确预测,为关键部位耐磨材料的筛选提供了理论依据.实际应用实验结果表明,该新型减压阀使用过程中易磨损部位与仿真预测一致,使用寿命超过了1 200 h,满足实际应用需求.

英文摘要：

Relief valves used in the coal liquefaction equipment are running in an extremely harsh environment with extraordinarily high pressure differential and intensely slurry flow erosion.Based on the finite volume method（FVM）,the pressure and flow distributions of relief valves were analyzed,with K-ε turbulence and Mixture multiphase model.Moreover,for the new-style relief valves,variations of pressure drops with valve apertures and turbulence intensities with depths of valve seat hole were studied.Considering the fluid-erosion theory,optimal design was accomplished and the easy-wearing positions of the relief valves were accurately predicted to provide theoretical basis for the choice of wear resistant materials.The application results show that the easy-wearing positions are coincide with the predictions.Moreover,the working lifetime is largely elongated up to 1 200 hours and suitable for the practical application.