火电厂石膏旋流器分离性能强化研究  

Study of the Enhancement of the Separation Performance of a Gypsum Cyclone in a Thermal Power Plant

作　　者：安连锁[1] 杨阳[1] 刘春阳[1] 沈国清[1] 

机构地区：[1]华北电力大学国家火力发电工程技术研究中心,北京102206

出　　处：《热能动力工程》2014年第1期71-75,109-110,共5页Journal of Engineering for Thermal Energy and Power

基　　金：高等学校学科创新引智计划项目(B12034)

摘　　要：针对火电厂石膏旋流器存在空气柱、分离效率低等问题,进行了分离性能强化研究。采用Fluent软件,应用RSM(雷诺应力湍流模型)、VOF(流体体积模型)、DPM(离散相模型)对石膏旋流器的流场特性进行数值模拟;并搭建实验台分别对无中心棒、插入圆柱形中心棒、倒锥形中心棒的石膏旋流器进行性能实验,获得生产能力、分股比、分离效率等指标参数的变化规律。研究结果表明:石膏旋流器内存在负压区,导致外界空气从两端出口倒流进入形成空气柱;空气的螺旋运动会引起能量损失;采用中心棒可有效消除空气柱,降低能耗,提高生产能力,对于石膏旋流器的分离有很好的促进作用,并具有良好的入口压力适应性。In the light of such problems as the presence of an air column in gypsum cyclones in thermal power plants and the low separation efficiency,a study was performed to enhance the separation performance. By using the software Fluent and the RSM Reynolds stress turbulent flow model,VOF( volume of fluid) fluid volume model as well as the DPM( discrete particle model) model,a numerical simulation was performed of the characteristics of the flow field in the gypsum cyclone. Furthermore,a test rig was set up to test the performance of a gypsum cyclone without a central rod,with a cylindrical central rod and an upside-down cone-shaped central rod being inserted respectively in order to obtain the law governing the variation of the production capacity,split flow ratio,and separation efficiency etc. performance indexes. The research results show that a negative pressure zone in the gypsum cyclone is present,leading the air coming from outside world to form an air column by a reverse flow from outlets at both ends. The spiral movement of the air may bring about an energy loss and to use a central rod can effectively eliminate the aircolumn,lower the energy consumption and enhance the production capacity,thus playing a better role in promoting the separation inside the gypsum cyclone and meriting a good adaptability to the pressure at the inlet.

关 键 词：生产能力 分股比 分离效率 中心棒 石膏旋流器 分离性能 

分 类 号：TK124[动力工程及工程热物理—工程热物理]