发电技术 ›› 2023, Vol. 44 ›› Issue (1): 107-114.DOI: 10.12096/j.2096-4528.pgt.21064

• 发电及环境保护 • 上一篇    下一篇

脱硫湿烟气喷淋冷凝过程中的参数优化研究

刘文斌1, 李璐璐2,3, 李晓金1, 姚宣1,3, 杨海瑞3   

  1. 1.北京国电龙源环保工程有限公司,北京市 海淀区 100039
    2.太原理工大学 电气与动力工程学院,山西省 太原市 030024
    3.电力系统及发电设备控制和仿真 国家重点实验室(清华大学能源与动力工程系),北京市 海淀区 100084
  • 收稿日期:2022-05-23 出版日期:2023-02-28 发布日期:2021-06-28
  • 作者简介:刘文斌(1967),男,高级工程师,主要从事污染物控制技术研究,wenbin.liu.aa@chnenergy.com.cn
    李璐璐(1995),女,硕士研究生,主要从事脱硫湿烟气冷凝技术研究,1879770510@qq.com
    李晓金(1972),男,硕士,教授级高工,主要从事大气污染物控制、固废处置技术研究,xiaojin.li@chnenergy.com.cn
    姚宣(1987),男,硕士,高级工程师,主要从事污染物控制技术、热力系统研究,xuan.yao@chnenergy.com.cn
    杨海瑞(1972),男,博士,教授,主要从事循环流化床锅炉技术、煤燃烧及污染物控制研究,本文通信作者,yhr@mail.tsinghua.edu.cn
  • 基金资助:
    国家重点研发计划项目(2019YFE0102100)

Study on Parameter Optimization of Desulfurized Wet Flue Gas in Spray Condensation Process

Wenbin LIU1, Lulu LI2,3, Xiaojin LI1, Xuan YAO1,3, Hairui YANG3   

  1. 1.Beijing Guodian Longyuan Environmental Engineering Co. , Ltd. , Haidian District, Beijing 100039, China
    2.College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, China
    3.State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment (Department of Energy and Power Engineering, Tsinghua University), Haidian District, Beijing 100084, China
  • Received:2022-05-23 Published:2023-02-28 Online:2021-06-28
  • Supported by:
    National Key Research and Development Program of China(2019YFE0102100)

摘要:

湿法脱硫技术的广泛使用将脱硫效率提高到90%以上,但脱硫后烟气含湿量大,增加了雾霾和微细颗粒物形成的可能性。以喷淋塔作为研究对象,基于Fluent软件对塔内的气液两相流场进行了三维稳态数值模拟。结果表明:喷淋液滴粒径对烟气冷凝除湿具有关键作用,液滴粒径越小,气液两相接触面积越大,换热效果越明显,当液滴粒径小于700 μm时,烟气温降可达到6 K以上;当入口烟气温度为319~335 K时,所引起的冷凝水量的比值基本不变;喷淋液滴速度对烟气流场具有整合作用,选择合适的液滴速度可减小烟气回流区、提高塔内空间利用率,当液滴速度增加至40 m/s时,出口烟气温降可提升1.9 K左右。

关键词: 湿法烟气脱硫, 喷淋塔, 气液两相流, 除湿, 三维稳态数值模拟

Abstract:

The wide application of wet desulfurization technology makes the desulfurization efficiency reach more than 90%, but the high moisture content of flue gas after desulfurization increases the possibility of smog formation. The spray tower was the main body of research, and the three-dimensional steady-state numerical simulation of gas-liquid two-phase flow field in the tower was carried out based on Fluent software. The results show that the spray droplet diameter plays a key role in flue gas condensation and dehumidification. The smaller the droplet diameter, the larger the gas-liquid two-phase contact area, the more obvious the heat transfer effect. If the droplet diameter is less than 700 μm, the flue gas temperature drop above 6 K can be achieved. When the inlet flue gas temperature is in the range of 319-335 K, the ratio of condensed water caused by this temperature is basically unchanged. The spray droplet velocity has an integration effect on the flue gas flow field. Choosing the appropriate droplet velocity can reduce the flue gas reflux area, and improve the space utilization rate in the tower. When the droplet velocity increases to 40 m/s, the temperature drop of outlet flue gas can increase by about 1.9 K.

Key words: wet flue gas desulfurization, spray tower, gas-liquid two-phase flow, dehumidification, three-dimensional steady state numerical simulation

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