MDEA+MEA天然气脱碳工艺影响因素

基于自主设计建设的胺法脱酸中试实验装置,针对目前常用的天然气脱碳方法醇胺法,利用工业中应用较多的N-甲基二乙醇胺(MDEA)+一乙醇胺(MEA)的前期优选配方(2 mol·L^-1+1 mol·L^-1),进行醇胺法脱碳装置工艺参数优化实验研究,结果用于指导工业生产。本文在CO₂含量6%和4%两种原料气气质下,采用控制变量法,分析了吸收和再生参数对胺法脱碳工艺的影响规律,优选出操作参数。结果显示:在本实验操作参数范围内提高吸收温度、吸收压力和胺液循环流量有利于提高胺液吸收性能,提高再生温度、降低再生压力有利于提高胺液再生性能,但各参数受到反应机理、气液平衡、装置能耗、胺液性质等影响,存在最优值;本实验装置系统下,原料气处理量为50 Nm³·h^-1时,MDEA+MEA脱碳的优化工艺操作参数为:吸收温度55℃,吸收压力3.5~4 MPa,胺液循环流量0.25 m³·h^-1,再生温度120℃,再生压力50 kPa。

Factors affecting decarbonization of natural gas with MDEA+MEA

Based on the independently designed amine deacidification experimental device, the experiment adopted the common-used oxyamine process and preliminary preferred amine formulation (2 mol·L^-1+1 mol·L^-1) to study the optimization of operating parameters of alcohol amine gas decarbonization.The result are will be used to guide the industrial production.This paper analyzed the influence of the operating parameters on the amine decarbonization process under the control variable method with 6% and 4% CO₂ content and get the optimizing operating parameter.The results show that: the increase of the absorption temperature, the absorption pressure, and the amine solution circulation flow can improve amine absorption performance, the increase of the performance.However, all the parameters are influenced by the reaction mechanism,vapor-liquid equilibrium, the energy consumption, the nature of the amine solution and other factors, there is an optimal value; Under this experimental system, when the raw gas processing capacity is 50 Nm³·h ^-1,The optimization results of operating parameters are as follows: the absorption temperature is 55℃,the absorption pressure is 3.5-4 MPa, the amine solution circulation flow is 0.25 m³·h^-1, the regeneration temperature is 120℃ and the regeneration pressure is 50 kPa.