某隧道窑烟气换热器换热性能的研究  

Heat Transfer Characteristics of a Tunnel Kiln'S Flue Gas Heat Exchanger

作　　者：李杰[1] 胡国林[1] 孙健[1] 朱永红[1] 

机构地区：[1]景德镇陶瓷学院,江西景德镇333001

出　　处：《陶瓷学报》2013年第4期482-486,共5页Journal of Ceramics

基　　金：江西省教育厅科学技术研究项目(编号:GJJ12501);景德镇市科技项目(编号:2011-1-29)

摘　　要：首先对某陶瓷隧道窑的烟气换热器的尺寸和工作时的相关热工参量进行了测量。其次利用计算流体动力学软件FLUENT,对换热器内部的流场和温度场进行了数值模拟。模拟后得到的烟气出口温度等参量与测量值吻合较好,计算区域内的质点速度矢量图、温度场云图等,经分析,符合流体流动和传热规律。在上述工作的基础上,对换热器的换热性能进行了研究,得出结论:(1)单位时间内流经换热器烟气的能量减少量,空气的能量增加量,和换热器外壁向周围环境散失的热量分别为157.2kW、150.9kW、6.3kW;(2)烟气流经换热器的阻力损失远大于空气流经换热器的阻力损失;(3)烟气由入口到出口温度下降的值较小,阻力损失值较大,表明换热器的换热性能有待改进和提高。Firstly,the dimensions and thermal parameters of a ceramic tunnel kiln＇s flue gas heat exchanger under operative conditions are measured.Secondly,the flow field and temperature field in the operative heat exchanger are numerically simulated by using FLUENT,a CFD soft ware.The average temperature at the flue gas outlet and some other parameters gotten from the simulation fit those from measurement.The velocity vector distribution of the fluid particles and the nephogram of the temperature field in the computational domain accord with the rules of fluid flow and heat transfer.On the basis of the work above,heat transfer characteristics of the heat exchanger are researched and conclusions are drawn：（1） for per unit time,energy decrease of the gas flowing across the exchanger,the energy increase of the air,and the dissipating heat from the outwall of the exchanger into the surroundings are 157.2kw,150.9kW,and 6.3kW,respectively; （2） the loss of the mechanical energy of the gas flowing across the exchanger is much higher than that of the air flowing across the exchanger; （3） the temperature drop is relatively low and the loss of the mechanical energy is relatively high for the gas from the gas inlet to the outlet,so the heat transfer of the exchanger need be improved.

关 键 词：陶瓷隧道窑烟气换热器 换热性能 流场和温度场数值模拟 FLUENT软件 

分 类 号：TQ174.653[化学工程—陶瓷工业]