Effect of drum thermal conductivity on heat transfer of solids in externally heated rotary kiln

被引：0
|
作者：
Zhang Z. [1 ]
Liu Y.-L. [1 ]
Zhao X.-Q. [1 ]
Xiao Y.-G. [2 ]
Lei X.-M. [3 ]
机构：
[1] College of Mechanical and Electrical Engineering, Central South University, Changsha
[2] College of Traffic and Transportation Engineering, Central South University, Changsha
[3] College of Mechanical and Energy Engineering, Shaoyang University, Shaoyang
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Discrete element method; Externally heated; Heat transfer; Particles; Rotary kiln; Thermal conductivity;
D O I：
10.19476/j.ysxb.1004.0609.2019.12.13
中图分类号：
学科分类号：
摘要：
The drum thermal conductivity has a great influence on the heat transfer characteristics of the solids in the externally heated rotary kiln. The discrete element method was combined with heat transfer model, and EDEM and C++ were used to simulate the heat transfer process of the solids in the externally heated rotary kiln. The effects of drum thermal conductivity on the solids average temperature, standard deviation of temperature and the overall heat transfer coefficient were studied. The two steps of the solids heat transfer in the rotary kiln were modeled separately, and the roles of drum thermal conductivity in each step of heat transfer were discussed. The results show that during the process of increasing drum thermal conductivity, the solids temperature distribution in the rotary kiln presents the characteristics of "integral slow heating-irregular cold core-regular cold core". In a certain range, the increase of drum thermal conductivity promotes the heat transfer of the solids. After exceeding a certain range, it continues to increase without significant effect on heat transfer. When the solids standard deviation of temperature increases, the greater the drum thermal conductivity is, the worse the uniformity of the solids becomes. With the heating, the increase of drum thermal conductivity promotes the uniformity of the solids temperature. The total heat absorbed by the particles from the drum and the total heat transferred between the particles in contact with each other increase with the increase of drum thermal conductivity. © 2019, Science Press. All right reserved.
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页码：2802 / 2808
页数：6
相关论文
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