燃气烟气中低浓度CO_(2)的低能耗高效捕集工艺模拟优化  

Simulation and optimization of low energy consumption and high efficiency capture process for low concentration CO_(2)in flue gas

作　　者：李磊 赵宴民 田海洋 李江伟 周强 何佳妮 武琬越 LI Lei;ZHAO Yanmin;TIAN Haiyang;LI Jiangwei;ZHOU Qiang;HE Jiani;WU Wanyue(School of Chemical Engineering,Sichuan University of Science and Engineering,Zigong 643000,Sichuan,China)

机构地区：[1]四川轻化工大学化学工程学院,四川自贡643000

出　　处：《化工进展》2024年第S01期581-589,共9页Chemical Industry and Engineering Progress

基　　金：四川轻化工大学横向课题(HX2023456,HX2023204)。

摘　　要：燃气烟气中CO_(2)捕集一般采用化学吸收工艺,该工艺需要优化实现CO_(2)脱除率提高、能耗降低。本文使用Aspen Plus模拟了典型醇胺法CO_(2)捕集和优化的低能耗高效CO_(2)捕集过程,考察了两种工艺下乙醇胺(MEA)+H_(2)O和MEA+甲基二乙醇胺(MDEA)+H_(2)O不同吸收剂循环量、吸收温度对CO_(2)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CO_(2)捕集工艺和低能耗高效CO_(2)捕集工艺都可以达到捕集后CO_(2)纯度≥90%(体积分数)、CO_(2)脱除率>90%、能耗<3.0GJ/tCO_(2)的设计要求,MEA+H_(2)O吸收剂的最优循环量是60m^(3)/h,MEA+MDEA+H_(2)O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CO_(2)脱除率和CO_(2)回收率基本相同,低能耗高效CO_(2)捕集工艺贫液再生能耗可降低0.13GJ/tCO_(2)。CO_(2)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。The capture of CO₂from flue gas is commonly achieved using chemical absorption processes.The process requires optimization to enhance CO_(2)removal efficiency while minimizing energy consumption.This paper used Aspen Plus simulation to model both the typical amine-based CO_(2)capture process and an optimized low-energy,high-efficiency CO_(2)capture process.The effects of MEA+H_(2)O and MEA+MDEA+H_(2)O absorbent circulation and absorption temperature on CO_(2)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 CO_(2)with a purity of≥90%and a removal efficiency of>90%,while keeping energy consumption below 3.0GJ/tCO_(2).The optimal solvent circulation rates were 60m³/h for MEA+H_(2)O and 65m³/h for MEA+MDEA+H_(2)O.The absorption temperature range was 40-45℃.Under the same absorption agent and circulation rate,both processes achieved similar CO_(2)removal rates and recovery efficiencies.The low-energy,high-efficiency CO_(2)capture process reduced the energy consumption for lean liquid regeneration by 0.13GJ/tCO_(2).After the optimization of CO_(2)capture process,equipment investment and utility consumption costs could be significantly reduced.

关 键 词：低浓度CO_(2)烟气 脱碳 贫液再生能耗 CO_(2)脱除率 工艺模拟 

分 类 号：TQ028.1[化学工程]