辊道窑烧成带含坯体流场和温度场的数值模拟

Numerical Simulation of Flow Field and Temperature Field of Gas and Porcelain Blank in the Firing Zone of a Roller Kiln

国内、外研究者在利用计算流体动力学软件模拟陶瓷工业中辊道窑等连续式窑炉的流场和温度场时,面临处理移动坯体气固耦合传热问题的困难,迄今罕有好的解决方法。论文研究出一种经验证有效的方法,即将瓷坯区域当做流体处理,并将瓷坯外壁设置为耦合壁面。采用该方法,利用FLUENT软件模拟了某辊道窑烧成带含坯体在内的流场和温度场,根据模拟结果得出结论:研究区域坯体表面热流密度的平均值为1248 W/m^(2),综合换热系数的平均值为97.5 W/(m^(2)·K),烟气在窑内流动的机械能损失为0.27 Pa/m;挡板上、下移动时将改变挡板前后区域瓷坯的温升速率。

When using CFD software to simulate flow field and temperature field of the continuous kiln such as roller kiln in ceramic industry,researchers home and abroad are faced with the difficulty of how to deal with the gas-solid coupling heat transfer of the moving porcelain blank in kiln,and so far few good solutions have been found.In this paper,an effective method to solve this problem is obtained,which treats the porcelain blank region as fluid region and sets the outer wall of the porcelain blank as a coupling wall.By using this method and FLUENT software the three-dimensional flow field and temperature field in the firing zone of a roller kiln are simulated.Based on simulation results,it is concluded that in the research region the mean heat flux and integrated heat transfer coefficient on the surface of the green body is respectively 1248 W/m^(2) and 97.5 W/(m^(2)·K),and the mechanical energy loss of flue gas at flowing process is 0.27 Pa/m;When the baffle in the kiln is moved up or down,the temperature rising rate of ceramic body in the region before and after the baffle will change.