燃煤烟气碳捕集两相吸收剂开发及其性能研究  

Development and property study of two-phase absorbent for carbon capture in coal-fired flue gas

作　　者：张琪悦 方梦祥[1] 周康 王涛 张威 葛春亮 张力 刘飞 ZHANG Qiyue;FANG Mengxiang;ZHOU Kang;WANG Tao;ZHANG Wei;GE Chunliang;ZHANG Li;LIU Fei(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310000,China;Zhejiang Tiandi Environment Protection Technology,Hangzhou 310000,China;Zhejiang Energy R&D Institute Co.,Ltd.,Hangzhou 311121,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310000 [2]浙江天地环保技术有限公司,浙江杭州310000 [3]浙江浙能技术研究院有限公司,浙江杭州311121

出　　处：《热力发电》2023年第4期24-33,共10页Thermal Power Generation

基　　金：浙江省“尖兵”研发攻关计划项目(2022C03040);国家重点研发计划项目(2017YFB0603300)。

摘　　要：化学吸收法捕集燃煤烟气中的CO_(2)是一种有效的降低CO_(2)排放的方式。两相吸收剂与传统有机胺吸收剂相比,能够明显降低捕集过程中的再生能耗,降低捕集成本。开发了一种新型的两相吸收剂,以物理溶剂二乙二醇二甲醚作为分相剂,乙醇胺和羟乙基乙二胺作为主剂,对其吸收再生性能、黏度、水相占比与分相区间进行了测试,将两相分别进行核磁共振光谱分析以确定其组成和分相机理。针对配方中的有机胺成分进行了优化,优化后的吸收剂配方吸收再生性能均优于传统的5 mol/L乙醇胺吸收剂,循环吸收容量可达2.086 mol/kg,99%以上的CO_(2)富集在水相,进入再生塔的吸收剂流量可减少约40%,富水相黏度低于10 mPa·s,理论再生能耗(以CO_(2)计)为2.688 GJ/t,具有良好的工业化应用前景。Chemical absorption method is an effective way to capture CO_(2)from flue gas of coal burning. Compared with conventional organic amine absorbents, two-phase absorbent can significantly reduce the regenerative energy consumption and the capture cost. A new type of two-phase sorbent is developed, which uses the physical solvent diethylene glycol dimethyl ether as split-phase agent, ethanolamine and hydroxyethyl ethylenediamine as the main agent, and its absorption regeneration performance, viscosity, water phase proportion and phase separation interval is tested. Moreover, nuclear magnetic resonance(NMR) spectroscopy is carried out for the two phases in the sorbent to determine the composition and phase splitting mechanism. The organic amine composition in the formulation is optimized, and the results show that, the absorption and regeneration performance of the optimized absorbent is better than that of the conventional 5 mol/L ethanolamine absorbent. The cyclic absorption capacity can reach 2.086 mol/kg, more than 99% of CO_(2)is enriched in water phase, and the flow of the absorbent entering into the regenerator can be reduced by about 40%. The viscosity of the water-rich phase is lower than 10 m Pa·s, the theoretical regeneration energy consumption is 2.688 GJ/t(calculated in CO_(2)), indicating the new two-phase sorbent has a good industrial application prospect.

关 键 词：两相吸收剂 化学吸收 有机胺 CO_(2)捕集 燃煤烟气 

分 类 号：X701[环境科学与工程—环境工程]