基于低温液化技术的CO_(2)捕集流程设计及分析  

Design and Analysis of CO_(2) Capture Process Based on Cryogenic Liquefaction Technology

作　　者：李子博 张勇 王彦军 王军 李雪琴[1] 李兆敏 LI Zibo;ZHANG Yong;WANG Yanjun;WANG Jun;LI Xueqin;LI Zhaomin(School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering,Shihezi 832003,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;Xinjing Jinjiang Chemical Industry Co.Ltd.,Kuitun 833200,China)

机构地区：[1]石河子大学化学化工学院/化工绿色过程省部共建国家重点实验室培育基地,新疆石河子832003 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]新疆锦疆化工股份有限公司,新疆奎屯833200

出　　处：《油气与新能源》2024年第2期58-65,共8页Petroleum and new energy

基　　金：新疆生产建设兵团重点领域科技攻关计划“工业CO_(2)捕集与利用关键技术研发及应用”(2023AB011);新疆生产建设兵团第七师—石河子大学科技创新专项项目“高效二氧化碳捕集与第七师范围内CCUS前景评价”(QS2022004)。

摘　　要：在工业生产中实现CO_(2)减排是一项艰巨的挑战,也是应对全球变暖的重要技术路线。CO_(2)捕集技术已得到了一定程度的发展,其中低温液化法具有可行性和经济性。利用工艺流程模拟软件Aspen Plus对低温液化分离CO_(2)工艺进行全流程模拟,选择3种物性方法对混合气的泡露点线进行模拟分析,基于某公司排放的含有高浓度CO_(2)的CO_(2)/N_(2)混合气为碳源,并对比文献数据,选择PR(Peng Robinson)状态方程作为本工艺的物性方法。分析了液化压力和温度对混合气液化率及CO_(2)纯度的影响,以CO_(2)液化率不低于90%、纯度不低于99.5%为目标,确定了最佳液化条件。为了最大限度地减少能耗,优化了冷却介质流量、冷凝温差、蒸发温度等工段参数,在最优条件下,CO_(2)液化率达91.80%、纯度达99.50%,液化单位总能耗最低为12.22 kW·h/kmol。该研究可为低温液化分离CO_(2)工艺设计与性能优化提供理论支持和技术参考。Realizing CO_(2) emission reduction in industrial production is an arduous challenge and an important technological approach to combating global warming.CO_(2) capture technology has been developed to a certain extent and the low-temperature liquefaction method is feasible and economical.The paper selects three physical property methods to simulate and analyze the bubble dew point line of the mixture with the process simulation software Aspen Plus,which can simulate the whole process of CO_(2) separation by low-temperature liquefaction and chooses Peng Robinson equation as the method for this process using the CO_(2)/N_(2) mixture with high concentration CO_(2) as well as comparing with the literature data.It analyzes the effects of liquefaction pressure and temperature on the liquefaction rate of mixture and the purity of CO_(2),determines the optimal liquefaction conditions at the condition of the liquefaction rate of CO_(2)≥90% and purity≥99.5%,optimizes such parameters as cooling medium flow rate,condensation temperature difference,and evaporation temperature to reduce the energy consumption to the maximum extent.The simulation results showed that the liquefaction rate of CO_(2)can reach 91.80%,the purity of CO_(2) can reach 99.50%,and the lowest total energy consumption per unit of liquefaction can be 12.22 kW·h/kmol under these optimal conditions,which could provide the theoretical support and technical reference in the technological design and performance optimization of CO_(2) separation by lowtemperature liquefaction.

关 键 词：低温液化 气液相平衡 Aspen Plus CO_(2)/N_(2)混合气 

分 类 号：TP116.3[自动化与计算机技术—控制理论与控制工程]