摘要
根据活性石灰回转窑竖式预热器的结构特点和工作原理,建立了竖式预热器的有限元模型,采用传热学理论,推导了换热器的对流换热系数。利用有限元软件ANSYS的Flotran模块,对预热器的热流场分布进行仿真分析,得到了石灰石颗粒排列方式和空隙率对预热器内部温度场、气体的速度和石灰石颗粒温升的影响规律,同时分析了预热器结构形状对温度场的影响。分析结果表明,影响石灰石颗粒温升的主要参数是对流换热系数,在难以大幅度改变对流换热系数时,改变预热器结构能有效地提高预热器的加热效率。
According to the structural features and working principles of rotary kiln,a finite element model of vertical preheater was built.Then the convection heat transfer coefficient was deduced on the theory of heat transfer.On the simulation analysis of heat transfer of the vertical preheater based on Flotran of ANSYS,the influences of arrangement model and dutyfactor of limestones on the temperature field,speed of the air and the temperature rise of the limestones were obtained.Some rules were found.And the influences on the temperature exerted by structure of the vertical preheater were analyzed.The results show that the main parameters which influence the temperature rise of the limestone are the convection heat transfer coefficient.Changing the structure of the vertical preheater can improve the heat efficiency effectively when the convection heat transfer coefficient cannot be easily changed.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2010年第17期2074-2078,共5页
China Mechanical Engineering
