化工学报 ›› 2019, Vol. 70 ›› Issue (4): 1367-1374.DOI: 10.11949/j.issn.0438-1157.20181328

• 流体力学与传递现象 • 上一篇    下一篇

氨法烟气脱硫SO2吸收传质系数研究

贾勇1,2(),蒋进1,赵忍1,荣卫龙3,殷李国1,顾明言1,龙红明2   

  1. 1. 安徽工业大学能源与环境学院,安徽 马鞍山 243002
    2. 冶金减排与资源综合利用教育部重点实验室,安徽工业大学,安徽 马鞍山 243002
    3. 山东爱亿普环保科技有限公司,山东 淄博 256400
  • 收稿日期:2018-11-15 修回日期:2019-01-09 出版日期:2019-04-05 发布日期:2019-04-05
  • 通讯作者: 贾勇
  • 作者简介:贾勇(1981—),男,博士,副教授,<email>jiayong2000@163.com</email>
  • 基金资助:
    国家重点研发计划项目(2017YFB0601805);国家自然科学基金项目(51308002)

Investigation of mass transfer coefficient of absorption of sulfur dioxide by ammonia

Yong JIA1,2(),Jin JIANG1,Ren ZHAO1,Weilong RONG3,Liguo YIN1,Mingyan GU1,Hongming LONG2   

  1. 1. School of Energy and Environment, Anhui University of Technology, Ma’anshan 243002, Anhui, China
    2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Ma’anshan 243002, Anhui, China
    3. Air Environmental Protection Science & Technology Co. Ltd., Zibo 256400, Shandong, China
  • Received:2018-11-15 Revised:2019-01-09 Online:2019-04-05 Published:2019-04-05
  • Contact: Yong JIA

摘要:

喷淋塔氨法脱硫技术被广泛应用于净化烟气的SO2,传质系数是喷淋吸收塔重要的设计和运行参数,但目前文献中有关氨法脱硫传质系数的报道很少,还有待进一步研究。在喷淋塔中对氨法脱硫SO2吸收传质过程进行了实验研究,结合对液滴和塔壁液膜运动的计算,得到不同实验条件下SO2的吸收传质速率,并建立了氨法脱硫SO2吸收传质系数表达式。该传质系数包含浆液pH、烟气流速ug和液气比L/G等主要参数,能够反映不同pH、ug和L/G条件下SO2在单位气液接触面积上的传质速率。对比验证结果表明,该传质系数计算得到的SO2吸收传质速率与实验值之间的相对误差小于±12%,二者能够较好地吻合。建立的传质系数表达式能够为喷淋塔氨法脱硫的优化设计和运行提供理论参考。

关键词: 氨法脱硫, 吸收, 传质, 模拟

Abstract:

The ammonia-based flue gas desulfurization (FGD) using spray scrubber is widely used for removing SO2 from flue gas. However, the reports about mass transfer coefficient of SO2 in the ammonia-based desulphurization process are little in the literature and a further investigation is needed, even though the mass transfer coefficient of SO2 is much needed for optimizing the design and operation of the absorption tower of ammonia-based FGD system. On basis of experiments of absorbing SO2 with ammonia in a lab-scale spray scrubber, the mass transfer rate per unit gas-liquid interfacial area was investigated by calculating the motion of droplets and liquid membrane. The correlation to predict the mass transfer coefficient of SO2 absorption by ammonia was also proposed, including parameters pH, ug and L/G. The yielding correlation could be used for quantitatively predicting the mass transfer rate per unit gas-liquid interfacial area under different operating conditions such as pH, gas flow rate and liquid-to-gas ratio. The comparison results show that the calculated SO2 mass transfer rate agrees well with the measured data. The relative error between the calculated mass transfer rate and the measured data is within ±12%. The established mass transfer coefficient expression can provide a theoretical reference for the optimal design and operation of spray tower ammonia desulfurization.

Key words: ammonia-based FGD, absorption, mass transfer, simulation

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