不同烟气CO_(2)含量下近等温相变捕集工艺调节策略模拟分析  

Simulation and analysis of regulation strategies for near isothermal phase change capture process under different CO_(2) content of flue gas

作　　者：常栋渊 唐思扬 钟山 鲁厚芳[1,2] 梁斌 CHANG Dongyuan;TANG Siyang;ZHONG Shan;LU Houfang;LIANG Bin(School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China;Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学新能源与低碳技术研究院,四川成都610065

出　　处：《低碳化学与化工》2024年第7期69-75,共7页Low-Carbon Chemistry and Chemical Engineering

基　　金：四川省先进建筑材料产教融合创新示范平台(川材教[2022]106号)。

摘　　要：CO_(2)相变捕集工艺具有较低的再生能耗,但在实际生产中,上游工艺产生的烟气中CO_(2)含量(物质的量分数,下同)不稳定,可导致工艺的整体能耗发生变化,因此需研究不同烟气CO_(2)含量下该工艺参数的调节策略。通过Python语言调用AspenPlus对近等温CO_(2)相变捕集工艺进行了模拟计算,分析了不同CO_(2)含量下吸收塔温度(ta)、解吸塔温度(td)、液/气比(v)、胺浓度(c)、解吸液循环比(s)对再生能耗和CO_(2)捕集率的影响以及相应的调节策略。结果表明,td对CO_(2)捕集率的影响最显著,当CO_(2)含量为5.00%时,其相关性系数最高(74.78%);ta对再生能耗的影响最显著,当CO_(2)含量为20.00%时,其相关性系数最高(-55.26%)。在维持CO_(2)捕集率大于等于90.00%的条件下,随着CO_(2)含量从5.00%升高至20.00%,再生能耗从2.35GJ/t降低至2.13GJ/t。此外,应根据CO_(2)含量对ta、td、c和v进行相应调节,以确保CO_(2)捕集率大于等于90.00%并且再生能耗最低。The CO_(2) phase change capture process has low regeneration energy consumption,but in actual production,the CO_(2) content(mole fraction,the same below)in flue gas generated by the upstream process is unstable,which can lead to changes in the overall energy consumption of the process.Therefore,it is necessary to study the adjustment strategies of the process parameters under different CO_(2) content of flue gas.Using Python to invoke Aspen Plus to simulate the near isothermal CO_(2) capture technology,and the effects of adsorption tower temperature(ta),desorption tower temperature(td),liquid/gas ratio(v),amine concentration(c)and desorption liquid circulation ratio(s)on the regeneration energy consumption and CO_(2) capture rate and the corresponding regulation strategies were analyzed.The results show that td has the most significant effect on CO_(2) capture rate,and the correlation coefficient is the highest(74.78%)when the CO_(2) content is 5.00%.ta has the most significant impact on regeneration energy consumption,and when CO_(2) content is 20.00%,its correlation coefficient is the highest(-55.26%).With the CO_(2) content increases from 5.00%to 20.00%,the regeneration energy consumption decreases from 2.35 GJ/t to 2.13 GJ/t under the condition that the CO_(2) capture rate is greater than 90.00%.In addition,ta,td,c and v should be adjusted accordingly according to CO_(2) content to ensure that CO_(2) capture rate is greater than 90.00%and the regeneration energy consumption is lowest.

关 键 词：CO_(2)捕集工艺 过程模拟 CO_(2)含量 热泵系统 参数调节 

分 类 号：TQ021.8[化学工程]