中空纤维膜接触器中N,N-二甲基乙醇胺吸收CO_(2)的特性  

Characteristics of CO_(2) absorption by N,N-dimethylethanolamine(DMEA)in hollow fiber membrane contactor

作　　者：吴佳佳 潘振[1] 商丽艳[2] 孙秀丽[2] 孙超 孙祥广 WU Jiajia;PAN Zhen;SHANG Liyan;SUN Xiuli;SUN Chao;SUN Xiangguang(College of Petroleum Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning,China;School of Environmental&Safety Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning,China;China Petroleum Pipeline Engineering Co.,Ltd.,Langfang 065000,Hebei,China;Fushun Special Equipment Supervision and Inspection Institute,Fushun 113001,Liaoning,China)

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]辽宁石油化工大学环境与安全工程学院,辽宁抚顺113001 [3]中国石油管道局工程有限公司,河北廊坊065000 [4]抚顺市特种设备监督检验所,辽宁抚顺113001

出　　处：《化工进展》2022年第4期2132-2139,共8页Chemical Industry and Engineering Progress

基　　金：辽宁省博士科研启动基金计划(2019-BS-159);辽宁省教育厅科学研究经费(L2019024);辽宁省教育厅重点科研项目(L2020002)。

摘　　要：N,N-二甲基乙醇胺(DMEA)是一种很有前途的吸收剂,具有较快的反应速率和较高的CO_(2)捕集能力。在本研究中,DMEA作为一种新型吸收剂被应用于中空纤维膜接触器,用于从CO_(2)/CH_(4)气体混合物中分离CO_(2)。通过建立二维稳态数学模型,模拟了MEA、DEA、MDEA和DMEA四种吸收剂在不同操作条件下对CO_(2)吸收性能的影响。结果表明,脱碳性能大小为MEA>DMEA>DEA>MDEA;气相参数对脱碳率的影响比液相参数更显著;提高气体流速和CO_(2)浓度,脱碳率均会下降;提高液速和吸收剂浓度,脱碳率均增大,适当提高吸收剂流速和吸收剂浓度可以提高CO_(2)去除效率。此外,CO_(2)吸收通量将随着气体速度的增加而增加,随着液相中CO_(2)负荷的增加而减少。最后,通过两种影响因素共同作用确定了膜接触器分离酸性气体的最佳操作条件。因此,膜吸收法在天然气脱碳方面有良好的潜力。N,N-dimethylethanolamine(DMEA)is a promising absorbent because of its fast reaction rate and high CO_(2) trapping ability.In this study,DMEA,as a new type of absorbent,was used in hollow fiber membrane contactors to separate CO_(2) from CO_(2)/CH_(4) gas mixtures.A two-dimensional steady-state mathematical model was established to simulate the effects of MEA(monoethanolamine),DEA(diethanolamine),MDEA(N-methyldiethanolamine)and DMEA on the absorption properties of CO_(2) under different operating conditions.The results showed that the decarbonization performance was MEA>DMEA>DEA>MDEA,the effect of gas phase parameters on decarbonization rate was more significant than liquid phase parameters,the decarbonization rate decreased with the increase of gas flow rate and CO_(2) concentration,the decarbonization rate increased with the increase of liquid velocity and absorbent concentration,and the removal efficiency of CO_(2) can be improved by properly increasing absorbent flow rate and absorbent concentration.In addition,the CO_(2) absorption flux will increase with the increase of gas velocity and decrease with the increase of CO_(2) load in the liquid phase.Finally,through the joint action of two influencing factors,the best operating conditions of membrane contactor for acid gas separation were determined.Therefore,membrane absorption had good potential in natural gas decarbonization.

关 键 词：CO_(2)捕集 膜接触器 N N-二甲基乙醇胺 数值模拟 传质 

分 类 号：TE64[石油与天然气工程—油气加工工程]