化工学报 ›› 2021, Vol. 72 ›› Issue (3): 1521-1528.DOI: 10.11949/0438-1157.20201861

• 过程系统工程 • 上一篇    下一篇

基于MDEA的烟气SO2捕集过程工艺参数和能量集成分析

王东亮1(),谢江鹏1,周怀荣1,孟文亮1,杨勇1,李德磊2   

  1. 1.兰州理工大学石油化工学院,甘肃 兰州 730050
    2.白银有色集团股份有限公司,甘肃 白银 730900
  • 收稿日期:2020-12-07 修回日期:2020-12-21 出版日期:2021-03-05 发布日期:2021-03-05
  • 通讯作者: 王东亮
  • 作者简介:王东亮(1982—),男,博士,副教授,wangdl@lut.edu.cn
  • 基金资助:
    甘肃省科技重大专项(19ZD2GD001);甘肃省高等学校产业支撑计划项目(2020C-06)

Parameters analysis and energy integration in flue gas SO2 capture process based on MDEA

WANG Dongliang1(),XIE Jiangpeng1,ZHOU Huairong1,MENG Wenliang1,YANG Yong1,LI Delei2   

  1. 1.School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
    2.Baiyin Nonferrous Group Co. , Ltd. , Baiyin 730900, Gansu, China
  • Received:2020-12-07 Revised:2020-12-21 Online:2021-03-05 Published:2021-03-05
  • Contact: WANG Dongliang

摘要:

有机胺吸收法是一种高效环保型烟气脱硫技术,而从系统工程的角度对烟气SO2捕集工艺的分析、优化和能耗评估尚未有详细报道。对N-甲基二乙醇胺(MDEA)为吸收剂的烟气SO2捕集过程工艺进行研究,考察了MDEA浓度、温度、SO2解吸率对捕集效果的影响规律。结果显示,MDEA溶液浓度为30%(质量)、烟气温度不高于45℃、回流贫液温度不高于41℃时,SO2吸收效果较好;增加SO2解吸率是以降低解吸气中SO2纯度和增大再沸器负荷为代价,水分汽化是再生能耗增高的主要原因。针对吸收剂再生过程能耗大的问题,采用热泵辅助精馏对解吸过程进行能量集成,吸收剂再生能耗可降低47%,年度总费用(TAC)可降低9.93%。本研究对有机胺体系的SO2捕集系统工业化应用具有重要的指导作用。

关键词: 有机胺, SO2捕集, 参数分析, 能量集成, 热泵辅助精馏

Abstract:

Organic amine absorption is an efficient and environmentally friendly flue gas desulfurization technology, and the analysis, optimization and energy consumption evaluation of the flue gas SO2 capture process from the perspective of system engineering have not been reported in detail. In this paper, SO2 capture process of flue gas was studied with N-methyldiethanolamine (MDEA) as the absorbent. The effects of MDEA concentration, temperature, and SO2 desorption rate on the SO2 capture were investigated. The results show that the optimized parameters for SO2 absorption are as follows: MDEA concentration, feed temperature of flue gas and absorbent are 30%(mass), below 45℃ and 41℃, respectively. Increasing of the SO2 desorption ratio is at the expense of the low SO2 desorption purity and the high energy consumption of absorbent regenerative process, since water gasification is the main reason for the high energy consumption. In order to solve the problem of high energy consumption in the regenerative process, the modified process with heat pump technology was proposed. The energy consumption of absorbent regeneration can be reduced by 47%, TAC can be reduced by 9.93% in the heat pump assistant desorption process. It is expected from the study to strengthen the development of the industrial application of SO2 capture of organic amine system.

Key words: organic amine, SO2 capture, parameter analysis, energy integration, heat pump assistant distillation

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