摘要
针对天然气净化厂中脱硫脱碳过程,采用平衡溶解度的概念和物料平衡建立了H2S和CO2在N-甲基二乙醇胺水溶液中选择性吸收的数学模型,对实际工业过程进行了模拟计算。分别考查了操作压力和胺液循环量等因素来分析吸收塔吸收酸性气体的情况,得出了提高操作压力和吸收液的流量均难以增加二氧化碳的吸收量,并将该模型的预测值与实际工况条件下进行了对比。数据模拟结果,提出在这一特定条件下的改进措施与方法,即采取中段脱除二氧化碳的方法,可得气流中二氧化碳的体积分数从4.7%降到3%,满足生产要求。这些结果对吸收塔的实际操作与改造提供了理论依据。
s:As background of absorption of CO2 and H2S in the gases industry, a mathematical model of the absorption process of hydrogen sulfide and carbon dioxide in aqueous solutions of N-methydiethanolamine was developed and built through the theoretical equilibrium, the equilibrium solubility and mass balance. The effects of the operational pressure and the flow ratio of N-methydiethanolamine aqueous on the absorption efficiency were investigated. The simulation results show that it is impossible to increase the absorption quality of CO2 with increase of operational pressure and the flow of MDEA. According to the experimental results, an absorption method is suggested that de-absorption of CO2 is made in middle of tower beforehand. Through this method, the ratio of CO2 in the gas stream can descend from 4.7% to 3%. So it can be used for the operation and development of the absorption tower using the method.
出处
《石油化工高等学校学报》
CAS
2003年第1期24-26,35,共4页
Journal of Petrochemical Universities
关键词
甲基二乙醇胺
吸收
数学模拟
N-methyldiethanolamine aqueous
Absorption
Mathematical simulation
