基于CPFD方法的锥形阀流量特性模型构建  

Construction of Flow Characteristic Model of Cone Valve Based on CPFD Method

作　　者：肖惠仁 姚禹歌 张缦[1] 吕俊复[1] 张扬[1] XIAO Huiren;YAO Yuge;ZHANG Man;LYU Junfu;ZHANG Yang(Department of Energy and Power Engineering,Tsinghua University,Haidian District 100084,Beijing)

机构地区：[1]清华大学能源与动力工程系,北京市海淀区100084

出　　处：《中国电机工程学报》2020年第22期7365-7372,共8页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0600203)。

摘　　要：锥形阀作为一种性能优异的灰控阀,具有运行稳定,系统故障率低等特点,经常应用于循环流化床(circulating fluidized bed,CFB)锅炉外置式换热器以及排渣系统中。目前锥形阀流率控制研究尚处于空白状态,缺乏相关数据和理论的支持,工业应用中也大多是通过经验来配置和使用锥形阀,所以对锥形阀流量特性进行研究,为锥形阀的设计和使用提供理论支持,是十分有必要的。利用计算颗粒流体动力学(computational particle fluid dynamics,CPFD)方法搭建锥形阀流动数值模拟模型,对锥形阀物料流动进行数值模拟,通过对网格数、曳力模型、应力参数等进行选取和调节,得到与实际实验情况相符合的锥形阀流动模型。在选取的工况下,Wen Yu-Ergun曳力模型模拟得到的结果与实验结果匹配度最高;网格密度比取2.24、网格数取35万时,网格质量及模拟速度满足要求;通过参数调节对比,确认了模拟时最佳的密堆积体积分数与应力模型参数值。经验证,选取的模型参数可适用于改文所涉及的几乎所有工况条件,同时可使流量误差控制在±10%以内,床压误差控制在±2%以内。As a kind of excellent ash control valve, cone valve is frequently used in external heat exchangers and slagging systems of circulating fluidized bed boiler. The cone valve was favored by its characteristics of stable operation and low failure rate. Up to now, the study of the cone valve is still in a blank state, the design, use and configuration of cone valve are mostly selected by experience, lack of relevant research data to support the industrial application. Therefore, it is necessary to study the flow characteristics of cone valve. In this paper, the computational particle fluid dynamic(CPFD) method was used to conduct numerical simulation of the particle flow of the cone valve. By selecting and adjusting the stress parameters, the mesh number and drag force model, obtaining the CPFD model which is in accordance with the experimental data. Under relatively operating conditions, the Wen Yu-Ergun drag model and other suitable model parameters were determined in the CPFD simulation of cone valve. The CPFD model can be applied to all the involved conditions with verification, and the error of flow rate can be controlled within 10% and error of bed pressure within 2%.

关 键 词：锥形阀 流量特性 计算颗粒流体力学 流化床 

分 类 号：TM62[电气工程—电力系统及自动化]