Modeling of mass balance behavior in a coal water slurry fired circulating fluidized bed boiler

被引：0

作者：

Ke X. ^{[1
]}

Zhang M. ^{[1
]}

Yang H. ^{[1
]}

Lü J. ^{[1
]}

Zhang J. ^{[2
]}

Liu A. ^{[2
]}

Guo X. ^{[2
]}

Zhai Y. ^{[2
]}

Zhao X. ^{[2
]}

机构：

[1] Department of Energy and Power Engineering, Tsinghua University, Beijing

[2] Taiyuan Boiler Group Co. Ltd., Taiyuan

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 01期

关键词：

Circulating fluidized bed; Coal water slurry; Cyclone efficiency; Model; Particle size;

D O I：

10.11817/j.issn.1672-7207.2021.01.008

中图分类号：

学科分类号：

摘要：

In order to study the mass balance characteristics of the circulating fluidized bed(CFB) boiler burning coal water slurry(CWS), an efficient 1-dimensional CFB boiler model was developed. The effects of cyclone efficiency and particle size of injected CWS on the mass balance were emphatically discussed. The results show that when the cyclone efficiency is lower, the average size of bed materials inside furnace becomes larger, namely, the bed quality is lower, and the solid circulation rate decreases. For the CFB boiler equipped with low efficiency cyclones, though there exits an optimal CWS particle size distribution to reach the best performance of solid circulating loop, the influence of CWS particle size is relatively small, hence, the cyclone efficiency is the more important factor in engineering. However, when the cyclone efficiency increases, the influence of CWS particle size becomes more obvious, and the optimal CWS particle size can be smaller. Therefore, if the cyclone efficiency is enough, it can be considered to reduce the injected CWS particle size to further increase the bed quality and solid circulation rate. It indicates that applying high efficiency cyclones plus fine CWS particles can obtain satisfactory performance of solid circulating loop in engineering, which provides a solution to the operation optimization of the CWS-fired CFB boilers. © 2021, Central South University Press. All right reserved.

引用

页码：86 / 95

页数：9

共 25 条

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