石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (6): 1111-1119.doi: 10.3969/j.issn.1001-8719.2020.06.001

• 化学链燃烧 • 上一篇    下一篇

3MWth煤化学链燃烧装置的设计计算与分析

陈虎, 李振山, 蔡宁生   

  1. 清华大学 热科学与动力工程教育部重点实验室,北京 100084
  • 收稿日期:2020-04-07 修回日期:2020-07-10 出版日期:2020-11-25 发布日期:2020-12-02
  • 通讯作者: 李振山,男,副教授,博士,从事气固表面反应与传递和化学链循环过程等研究,E-mail:lizs@mail.tsinghua.edu.cn E-mail:lizs@mail.tsinghua.edu.cn
  • 作者简介:第一作者:陈虎,男,博士研究生,从事煤炭化学链燃烧研究,E-mail:hchen1992@hotmail.com
  • 基金资助:
    国家重点研发计划项目(2017YFE0112500)资助

Design and Analysis of 3 MWth Coal-Fired Chemical Looping Combustion

 CHEN Hu, LI Zhenshan, CAI Ningsheng   

  1.  Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
  • Received:2020-04-07 Revised:2020-07-10 Online:2020-11-25 Published:2020-12-02
  • Supported by:
     

摘要: 选用钛铁矿作为载氧体,对以煤为燃料的化学链燃烧系统的设计原理和方法进行了研究,并基于质量衡算、能量衡算、反应动力学和流态化理论编写了热力计算平台。利用该平台设计了额定热输入为3 MWth的煤化学链燃烧装置,获得了系统循环流率、气量分配、设备尺寸等结果;并研究了系统热量分配特性,发现该反应器能够实现自热运行。讨论了循环流率、钛铁矿转化率之差、过量空气系数和热输入对反应器装置自热运行的影响。结果表明,为保证化学链燃烧装置实现自热运行,系统的实际循环流率和热输入应分别大于4 kg/(s·MWth)和2.4 MWth,而过量空气系数应小于1.9。该工作为以煤为燃料的化学链燃烧示范装置的建造与运行奠定了基础。

关键词: 燃煤, 化学链燃烧, 3MWth热功率, 自热运行, 设计与分析

Abstract:

In this work, ilmenite was selected as the oxygen carrier, and the design principle and method of coal-fired chemical looping combustion (CLC) unit was studied. A conceptual model including mass balance, heat balance, reaction kinetics and hydrodynamics was developed in order to design the coal-fired CLC unit with a thermal input of 3MWth, and the results of solid circulation rate, gas volume of outlet stream and equipment size were obtained. The heat distribution characteristics of 3MWth coal-fired CLC unit were studied, and it is found that the unit could achieved the auto-thermal operation. In addition, the effects of important variables including solid circulation rate, conversion difference of ilmenite, excess air coefficient and thermal input on the auto-thermal operation were discussed. The results show that in order to keep the auto-thermal operation of 3 MWth coal-fired CLC unit, the solid circulation rate and thermal input should be higher than 4 kg/(s·MWth) and 2.4 MWth respectively, while the excess air coefficient should be less than 1.9. This work provides a foundation for the construction and operation of 3MWth coal-fired CLC unit.

Key words: coal, chemical looping combustion, 3MWth, auto-thermal operation, design and analysis

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