温度对旋风分离器内颗粒浓度分布影响的模拟  

Simulation of Influence of Temperature on Solids Concentration Distribution in Cyclone Separator

作　　者：万古军[1] 魏耀东[1] 薛晓虎 时铭显[1] 

机构地区：[1]中国石油大学化工学院,北京102249 [2]中国石油国际工程有限公司,北京100724

出　　处：《燃烧科学与技术》2008年第6期562-568,共7页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(G2005CB22120103);国家自然科学基金资助项目(20576074)

摘　　要：为了分析温度变化对旋风分离器内颗粒浓度分布的影响,对高温下旋风分离器内气固两相流流场进行了模拟.结果表明,在入口浓度一定的条件下,随着温度的升高旋风分离器近壁区域的高浓度区扩大,螺旋状灰带逐渐消失,颗粒浓度成片状分布,在锥体排尘口区域的颗粒浓度急剧上升形成了高浓度区;旋风分离器内部的低浓度区不仅缩小,而且浓度增大.旋风分离器的径向颗粒浓度分布可以用指数函数描述,其中颗粒的径向速度、颗粒的扩散系数和边壁的颗粒浓度是影响颗粒浓度分布的主要因素.In order to investigate the effect of temperature on solid concentration distribution in a cyclone separator, the gas-solid two-phase flow field under high temperature has been simulated. The results show that under a certain inlet solids concentration, as the temperature increases, the solid high-concentration region near the wall extents, and the helix dust band develops into dust lamina, forming the solid high-concentration region in the cyclone separator cone and dust hopper. In the cyclone separator, not only does the solid low-concentration region shrinks, but the solid concentration in this region increases. The radial distribution of solid concentration is fit for an exponential function. The factors which influence solid concentration distribution include solid radial velocity, diffusion coefficient and solids concentration on walls.

关 键 词：旋风分离器 高温 气固两相流 颗粒浓度分布 模拟 

分 类 号：TQ051.8[化学工程]