摘要
二氧化碳(CO_(2))化学吸收法成熟度高,是有效的工业碳捕集技术。无水相变吸收剂具有高吸收速率和低解吸能耗。然而,在工业CO_(2)吸收过程中,气源中的水会被无水相变吸收剂吸收,影响后续的吸收效果。研究了典型的无水混合胺相变吸收剂(二甘醇胺-五甲基二乙烯三胺-乙二醇,P-T-EG)捕集模拟含水烟气CO_(2)过程中的性能变化;探讨了水分的引入对富相比(体积比)、CO_(2)负载量,以及分相后贫相和富相水分含量(质量分数,下同)的影响。结果表明,水分的引入有利于降低富相黏度,增大富相比;随着循环次数的增加,富相比增大,贫相水分含量比富相低;水分的引入对解吸平衡的影响微弱。使用Aspen Plus,计算了不同水分含量P-T-EG吸收富相的解吸过程,发现解吸塔再沸器温度100℃、冷凝温度35℃时,P-T-EG+10%H_(2)O(10%为水分含量)可以达到吸收水分和解吸水分进出平衡,此时解吸塔中胺的质量损失为1.05×10^(-10)(质量比)。
Carbon dioxide(CO_(2)) chemical absorption method has matured and is an effective industrial carbon capture technology.Anhydrous phase change absorbents exhibit high absorption rates and low desorption energy consumption.However,in the industrial CO_(2) absorption process,the water in the gas source is absorbed by the anhydrous phase change absorbent,affecting the subsequent absorption effect.The performance changes of the typical anhydrous mixed amine phase change absorbent(diethanolamine-pentamethyldiethylenetriamine-ethylene glycol,P-T-EG) in capturing CO_(2) from simulated flue gas containing water were investigated.The effects of water accumulation on the rich phase ratio(volume ratio),CO_(2) loading,and the moisture content(mass fraction,the same as below) of lean and rich phases after phase separation were explored.The results show that the accumulation of water is beneficial to reducing the viscosity of the rich phase and increasing the rich phase ratio.As the number of cycles increases,the rich phase ratio increases,and the moisture content of the lean phase is lower than that of the rich phase.The impact of water accumulation on desorption equilibrium is weak.Using Aspen Plus,the desorption process of P-T-EG rich phase with different moisture contents was calculated.It is found that at a reboiler temperature of 100℃ and a condensation temperature of 35℃,P-T-EG+10%H_(2)O(10%is the moisture content) can achieve a balance between absorption and desorption water.At this time,the mass loss of amine in the desorption column is 1.05×10~(-10)(mass ratio).
作者
沈紫薇
常栋渊
郭本帅
鲁厚芳
季燕
唐思扬
毛松柏
梁斌
SHEN Ziwei;CHANG Dongyuan;GUO Benshuai;LU Houfang;JI Yan;TANG Siyang;MAO Songbai;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;SINOPEC Nanjing Research Institute of Chemical Industry Co.,Ltd.,Nanjing 211500,Jiangsu,China)
出处
《低碳化学与化工》
CAS
北大核心
2023年第4期107-113,共7页
Low-Carbon Chemistry and Chemical Engineering
基金
国家自然科学基金(21878190)。
关键词
无水吸收剂
相变
CO_(2)
水分含量
叔胺
分相行为
anhydrous absorbent
phase change
CO_(2)
moisture content
tertiary amine
phase splitting behavior
