Regulating valve of pulverized coal flow is an important gas-solid two-phase valve in the pulverized coal gasification process. Flow characteristics of gas-solid two-phase flow are studied by experimental and numerical approach of computational particle fluid dynamic (CPFD), respectively. The regulation performance of the regulating valve and its influence on the system were investigated. The strong nonlinearity of the relationship between the valve opening and coal flow rate was revealed by experiments and three regions were defined based on the change trend of the coal mass flow rate with the valve opening. Based on the CPFD approach, the process of particles flowing through the regulating valve was observed, and flow parameters including pressure distribution, velocity distribution, and particle volume fraction along the flow channel were analyzed. The model reveals that the presence of the valve introduces strong local inhomogeneities in the gas-solid flow that are studied in order to estimate the regions of the pipe that are mostly affected by the regulating valve. Numerical results indicate that the CPFD method is suitable for the study of pneumatic conveying system with complex flow channels on an industrial scale and can provide a reference for structural design of the regulating valve.

煤粉流量调节阀是煤粉气化过程中重要的气固两相阀。分别通过实验和数值计算方法来研究气固两相流的流动特性。研究了调节阀的调节性能及其对系统的影响。通过实验揭示了阀门开度与煤流量之间关系的强非线性，并根据煤质量流量随阀门开度的变化趋势定义了三个区域。基于CPFD方法，观察了颗粒流过调节阀的过程，并观察了流参数，包括压力分布，速度分布，分析了沿流道的颗粒体积分数。该模型表明，阀门的存在在气固两相流中引入了强烈的局部不均匀性，对此进行了研究，以便估算出大部分受调节阀影响的管道区域。数值结果表明，CPFD方法适用于工业规模复杂流道的气力输送系统的研究，可为调节阀的结构设计提供参考。