基于HYSYS模拟的低浓度CO_(2)捕集配方优选及参数优化  

Formula and Parameters Optimization of Low Concentration CO_(2) Capture Based on HYSYS Simulation

作　　者：张天娇 刘欣 张青 刘永铎 柳扬 ZHANG Tianjiao;LIU Xin;ZHANG Qing;LIU Yongduo;LIU Yang(China Petroleum Engineering&Construction Corporation North China Branch,Renqiu Hebei 062550,China;CNPC Baoji Oilfield Machinery Co.,Ltd.Hebei Drilling Equipment Manufacturing Branch,Renqiu Hebei 062550,China;College of Petroleum and Natural Gas Engineering,Changzhou University,Changzhou Jiangsu 213000,China)

机构地区：[1]中国石油工程建设有限公司华北分公司,河北任丘062550 [2]中国石油集团宝鸡石油机械厂河北钻采装备制造分公司,河北任丘062550 [3]常州大学石油与天然气工程学院,江苏常州213000

出　　处：《当代化工》2024年第9期2025-2030,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金项目(项目编号:52004039)。

摘　　要：针对低浓度CO_(2)捕集的装置能耗过大及甲烷损失较高的问题,以黔北地区产出的页岩气为研究对象,采用哌嗪(PZ)活化N-甲基二乙醇胺(MDEA)法进行二氧化碳捕集,应用Aspen HYSYS软件建立低浓度CO_(2)捕集的工艺模型,并引入化学反应式以提高工艺模型的计算精度,在综合考察CO_(2)捕集效果、设备能耗、甲烷损失、富液酸气负荷等条件下,对胺液配方(MDEA和PZ质量分数)进行优选,并对胺液循环量、吸收温度、再生温度等关键参数进行优化。在达到CO_(2)捕集指标的前提下,较优的MDEA质量分数为37%~42%,较优的PZ质量分数为2.5%~5.0%。推荐较优的胺液配方(质量分数)为40%MDEA+3%PZ,胺液循环量优化值为45 m^(3)·h^(-1),再生温度优化值为118℃;优化后系统总能耗降低8.9%,再生能耗降低12%,节能效果显著。Aiming at the problems of excessive energy consumption and high methane loss in the device for capturing low-concentration CO_(2) in shale gas,taking the shale gas produced in northern Guizhou China as the research object,piperazine(PZ)activated N-methyldiethanolamine(MDEA)method was used to capture CO_(2),and Aspen HYSYS software was used to establish the process model for capturing low-concentration CO_(2),and chemical reaction formula was introduced to improve the calculation accuracy of the process model.Under the conditions of comprehensive investigation of CO_(2) capture effect,equipment energy consumption,methane loss and acid gas load of rich liquid,the formulation of amine liquid(MDEA and PZ mass fraction)was optimized,and the key parameters such as amine liquid volume flow,absorption temperature and regeneration temperature were optimized.On the premise of reaching the CO_(2) capture index,the optimal MDEA mass fraction was 37%~42%,and the optimal PZ mass fraction was 2.5%~5.0%.It was recommended that the optimal formula(mass fraction)of amine solution was 40%MDEA+3%PZ,the optimal circulation amount of amine solution was 45 m^(3)·h^(-1),and the optimal regeneration temperature was 118℃.After optimization,the total energy consumption of the system was reduced by 8.9%,and the regenerative energy consumption was reduced by 12%,with remarkable energy saving effect.

关 键 词：低浓度 二氧化碳捕集 哌嗪活化N-甲基二乙醇胺 Aspen HYSYS 化学反应 模拟 优化 

分 类 号：TQ028.25[化学工程] TE624[石油与天然气工程—油气加工工程]