摘要
碳捕集、利用与封存技术是我国实现“双碳”目标的重要途径,其中非水吸收剂具有巨大的节能潜力,且适配现有吸收法混胺反应器,具有较大应用潜力,但存在CO_(2)饱和溶液黏度大、循环负荷低等问题。对此,以仲胺MCA为吸收组分,EG为有机溶剂,构建了低黏度、低温再生非水吸收体系,并考察了MCA/EG的吸收、再生性能。结果表明:3mol/L MCA/EG吸收剂的吸收负荷可达2.14 mol/L,黏度仅为44.19 m Pa·s;在40℃吸收30 min、80℃再生25 min条件下,循环负荷高达0.98 mol/L,为质量分数为30%的MEA/H2O溶液在105.5℃再生条件下循环负荷的1.46倍。通过C80微量热仪测试得到吸收剂的反应热为–82.85 k J/mol,低于MEA/H2O溶液。结合13C NMR与量子化学计算,探究了吸收剂捕集CO_(2)的反应机理,发现MCA的空间位阻效应降低了反应产物的稳定性,使氨基甲酸酯与EG进一步反应转化为烷基碳酸酯,降低了再生难度,实现了低温再生。该吸收体系可实现非水吸收剂的稳定运行,并扩大吸收剂再生中的余热利用范围,具有较大的降能耗优势。
Carbon capture,utilization and storage technology is an important way to realize the carbon peaking and carbon neutrality goals in China.Among them,the non-aqueous phase absorbents have great energy-saving potential,and it is suitable for the existing mixed amine reactor,which has a large development potential.However,there are still problems such as high viscosity of CO_(2)saturated solution and low circulating load.In this regard,a non-aqueous absorption system with low viscosity and regeneration temperature was constructed using secondary amine MCA as the absorbing component and EG as the organic solvent.The absorption and regeneration performance of MCA/EG was investigated.The results showed that,the absorption load of 3 mol/L MCA/EG solvent was up to 2.14 mol/L,and the viscosity was only 44.19 mPa∙s.Under the condition of absorption at 40℃for 30 min and regeneration at 80℃for 25 min,the cyclic load was as high as 0.98 mol/L,which is 1.46 times of the cyclic load of 30%MEA/H2O solution at 105.5℃.The reaction heat of the absorbent was measured to be-82.85 kJ/mol by C80 microcalorimeter,which was lower than that of the MEA/H2O solution.The reaction mechanism of CO_(2)capture by MCA/EG was explored by 13C NMR and quantum chemical calculations.It was found that the stability of the reaction products was reduced for the steric hindrance effect of MCA.The carbamates transform into alkyl carbonate by reacting with EG to realize the regeneration at low temperatures.MCA/EG can realize the stable operation of non-aqueous phase absorbent and expand the scope of waste heat utilization in absorbent regeneration,which has a great advantage of energy reduction.
作者
范永胜
龚海艇
李偲
陈臻
高晓艺
李目一
李小姗
张立麒
FAN Yongsheng;GONG Haiting;LI Cai;CHEN Zhen;GAO Xiaoyi;LI Muyi;LI Xiaoshan;ZHANG Liqi(Jiangsu Power Co.,Ltd.,CHN Energy,Nanjing 210024,China;Taizhou Power Generation Co.,Ltd.,CHN Energy,Taizhou 225327,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《热力发电》
北大核心
2025年第6期105-112,共8页
Thermal Power Generation
基金
国家自然科学基金项目(52106143)。
关键词
CO_(2)捕集
非水吸收剂
空间位阻胺
低温再生
CO_(2)capture
non-aqueous phase absorbent
steric hindrance amine
low-temperature regeneration
作者简介
第一作者:范永胜(1969),男,博士,正高级工程师,主要研究方向为电厂热能动力工程,16010163@ceic.com;通信作者:张立麒(1972),男,博士,教授,主要研究方向为热能工程,lqzhang@mail.hust.edu.cn。
