化工进展 ›› 2024, Vol. 43 ›› Issue (S1): 581-589.DOI: 10.16085/j.issn.1000-6613.2024-0716

• 资源与环境化工 • 上一篇    下一篇

燃气烟气中低浓度CO2的低能耗高效捕集工艺模拟优化

李磊(), 赵宴民, 田海洋, 李江伟, 周强, 何佳妮, 武琬越   

  1. 四川轻化工大学化学工程学院,四川 自贡 643000
  • 收稿日期:2024-04-28 修回日期:2024-06-04 出版日期:2024-11-20 发布日期:2024-12-06
  • 通讯作者: 李磊
  • 作者简介:李磊(1982—),男,博士,高级工程师,研究方向为烟气CO2捕集利用。E-mail:lilei20150620@yeah.net
  • 基金资助:
    四川轻化工大学横向课题(HX2023456)

Simulation and optimization of low energy consumption and high efficiency capture process for low concentration CO2 in flue gas

LI Lei(), ZHAO Yanmin, TIAN Haiyang, LI Jiangwei, ZHOU Qiang, HE Jiani, WU Wanyue   

  1. School of Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China
  • Received:2024-04-28 Revised:2024-06-04 Online:2024-11-20 Published:2024-12-06
  • Contact: LI Lei

摘要:

燃气烟气中CO2捕集一般采用化学吸收工艺,该工艺需要优化实现CO2脱除率提高、能耗降低。本文使用Aspen Plus模拟了典型醇胺法CO2捕集和优化的低能耗高效CO2捕集过程,考察了两种工艺下乙醇胺(MEA)+H2O和MEA+甲基二乙醇胺(MDEA)+H2O不同吸收剂循环量、吸收温度对CO2脱除率和贫液再生能耗的影响,分析了最优工艺技术条件,两种工艺的设备及公用工程运行成本。研究结果表明,典型醇胺法CO2捕集工艺和低能耗高效CO2捕集工艺都可以达到捕集后CO2纯度≥90%(体积分数)、CO2脱除率>90%、能耗<3.0GJ/tCO2的设计要求,MEA+H2O吸收剂的最优循环量是60m3/h,MEA+MDEA+H2O吸收剂的最优循环量是65m3/h,吸收温度是40~45℃。相同吸收剂及循环量下,两种工艺的CO2脱除率和CO2回收率基本相同,低能耗高效CO2捕集工艺贫液再生能耗可降低0.13GJ/tCO2。CO2捕集工艺经过优化后,设备投资及公用工程运行成本可以明显降低。

关键词: 低浓度CO2烟气, 脱碳, 贫液再生能耗, CO2脱除率, 工艺模拟

Abstract:

The capture of CO₂ from flue gas is commonly achieved using chemical absorption processes. The process requires optimization to enhance CO2 removal efficiency while minimizing energy consumption. This paper used Aspen Plus simulation to model both the typical amine-based CO2 capture process and an optimized low-energy, high-efficiency CO2 capture process. The effects of MEA + H2O and MEA + MDEA + H2O absorbent circulation and absorption temperature on CO2 removal rate and energy consumption of lean solution regeneration were investigated. The results revealed that both the typical amine-based process and the low-energy, high-efficiency process met the design requirements of capturing CO2 with a purity of ≥90% and a removal efficiency of >90%, while keeping energy consumption below 3.0GJ/tCO₂. The optimal solvent circulation rates were 60m³/h for MEA+H₂O and 65m³/h for MEA+MDEA+H2O. The absorption temperature range was 40—45℃. Under the same absorption agent and circulation rate, both processes achieved similar CO2 removal rates and recovery efficiencies. The low-energy, high-efficiency CO2 capture process reduced the energy consumption for lean liquid regeneration by 0.13GJ/tCO2. After the optimization of CO2 capture process, equipment investment and utility consumption costs could be significantly reduced.

Key words: low-concentration CO2 flue gas, CO? removal, lean liquid regeneration heat consumption, CO2 removal efficiency, process simulation

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