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化工学报  2015 

MDEA+MEA天然气脱碳工艺影响因素

DOI: 10.11949/j.issn.0438-1157.20150698, PP. 250-256

Keywords: 天然气,脱碳,醇胺法,中试装置,MDEA+MEA,参数优化

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Abstract:

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(2mol·L-1+1mol·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50Nm3·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3.5~4MPa,胺液循环流量0.25m3·h-1,再生温度120℃,再生压力50kPa。

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