煤气化装置中的粉煤流量调节阀数值模拟研究  

Numerical Simulation of Regulating Valve for Pulverized Coal in Coal Gasification

作　　者：陈美华 陆海峰[1] 郭晓镭[1] 龚欣[1] CHEN Meihua;LU Haifeng;GUO Xiaolei;GONG Xin(Shanghai Engineering Research Center of Coal Gasification,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学上海煤气化工程技术研究中心,上海200237

出　　处：《华东理工大学学报（自然科学版）》2020年第6期715-721,共7页Journal of East China University of Science and Technology

基　　金：国家重点研发计划资助(2018YFC0808500);国家自然科学基金资助项目(51876066);上海煤气化工程技术研究中心(18DZ2283900);中央高校基本科研业务费专项资金。

摘　　要：粉煤流量调节阀是气流床粉煤气化技术中用于控制粉煤流量的关键装置,其内部流场特性研究对粉煤调节阀的结构设计和工艺操作控制具有重要影响。借助计算颗粒流体动力学(CPFD)的数值模拟方法,研究了粉煤流量调节阀内气固两相流动特征。结果表明,CPFD数值模拟方法适合于研究工业规模的粉煤流经调节阀的气固两相流动过程,并获得了阀门流量特性曲线和气固两相流经调节阀的沿程压力、速度和浓度等分布规律。Regulating valve for pulverized coal is a key device to control and regulate the mass flow rate of pulverized coal in the coal gasification process.The study of the internal flow field characteristics has an important influence on the structure design and process operation control of the regulating valve.The gas-solid two-phase flow through the regulating valve for pulverized coal was studied by numerical approach of computational particle fluid dynamic(CPFD).First,a three-dimensional model of regulating valve for pulverized coal with 1000 mm length downstream pipe was established and validated with data from industry.The results of comparisons of pressure drop of regulating valve,coal velocity and particle mass concentration suggest that the CPFD method is suitable for the study of pneumatic conveying system with complex flow channels on an industrial scale.Then,a logic model coupled CPFD method was proposed to calculate the mass flow rate of pulverized coal under different opening degrees.The mass flow rates of pulverized coal ranging from 10%opening degree to 40%opening degree were predicted correctly with error less than 10%.The result can be served as a reference for industrial operation of regulating valve for pulverized coal.Finally,the flow characteristics along the valve various opening degrees were investigated to obtain the distribution of pressure,coal velocity and coal volume fraction.Based on the analyses of the flow characteristics along the valve,the gas-solid two-phase flow reached a steady flow at about 800 mm of the downstream pipe.

关 键 词：粉煤流量调节阀 计算颗粒流体动力学 流量预测 流动特征 两相流 

分 类 号：TQ54[化学工程—煤化学工程]