过热蒸汽气流粉碎分级机的数值模拟  

Numerical Simulation of a Superheated Steam Comminution Classifier

作　　者：王雅萍[1] 朱目成[1] 陈海焱[2] 

机构地区：[1]西南科技大学制造科学与工程学院,绵阳621010 [2]西南科技大学环境与资源学院,绵阳621010

出　　处：《机械科学与技术》2009年第2期167-170,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家"十一五"支撑计划重大项目(2006BAF02A24)资助

摘　　要：为进一步探索采用过热蒸汽工质对气流粉碎分级机的粉碎、分级等性能的影响，利用Fluent流体计算软件，首次对带有立式涡轮分级机的流化床式气流粉碎机进行整体建模，并分别以空气和蒸汽两种介质作为工质，计算和分析气流粉碎腔内部流场和温度场状态。数值模拟结果表明：采用过热蒸汽介质时的喷嘴出口处气流速度的最大值约为空气介质时的1．8倍；采用蒸汽介质在分级区形成稳定的径向、轴向流场速度要大于空气介质时的流场速度；在微负压条件下，采用过热蒸汽介质，由粉碎区至分级区粉碎腔内部有150℃～240℃的温度变化，腔内能够保持干燥运行。In order to study the effects of superheated steam medium on the comminuting and grading capability of the jet mill, the models of fluidized bed jet mill with a vertical turbine classifier are set up as a whole for the first time by means of the CFD software Fluent, and the internal flow-field and the temperature-field of the jet mill with different air and superheated steam medium are analyzed and computed in this paper. The result of numerical simulation indicates that the air flow velocity of the superheated steam is 1.8 times that of the air medium in the way out of the nozzle, and the steady flow-field velocity of higher than that of the air medium. Under the condition of the superheated steam in the area of classification is negative micro-pressure, the temperature is 150℃ to 240℃ from the inner area of eomminuting cavity to the grading area and the inner comminuting cavity can keep running in dryness.

关 键 词：Fluent软件 气流粉碎机 流场 数值模拟 

分 类 号：TQ051.91[化学工程] TD454[矿业工程—矿山机电]