LIN Haizhou;WU Dawei;FAN Yongchun;LUO Bixiong;PEI Aiguo;FANG Mengxiang;

• 1:China Energy Engineering Group Guangdong Electric Power Design Institute Co.
• 2:Ltd.
• 3:China Power Engineering Consulting Group Co.
• 4:Ltd.

Abstract：

Post-combustion chemical absorption is one of the most mature technologies for CO_2 capture from coal-fired power plants. However, the high energy consumption for regeneration of traditional amine-based solvents is not conducive to the commercial application of chemical absorption technology. Liquid-liquid biphasic solvents, which can greatly reduce the regeneration energy consumption, have the prospect of replacing traditional solvents. The technical characteristics and solvents development of liquid-liquid biphasic solvents were reviewed in this paper. The liquid-liquid biphasic solvents can be divided into three types according to the composition, namely blending amine type(active amine + tertiary amine phase separation agent + water), organic solvent type(active amine + organic solvent phase separation agent + water) and water-free type(active amine + tertiary amine/organic solvent phase separation agent). The analysis focused on the phase separation behavior, energy consumption, viscosity and CO_2 absorption load of three different type biphasic solvents. Among them, organic solvent type biphasic solvents have more advantages in regeneration energy consumption(1.5-3.2 GJ/t), viscosity(can be controlled below 20 mPa·s), and cost(organic solvent phase separation agent + water shows better potential in cost). As a new type of solvent, liquid-liquid biphasic solvents still face many challenges in industrial application compared to traditional solvents, such as high viscosity of rich phase, high cost of solvents and difficult in phase separation control, etc. In order to accelerate the industrial application of biphasic solvents, it is necessary to carry out more in-depth research on optimizing the formula system with low energy consumption, reducing the rich phase viscosity and the loss of solvents, improving the phase separation control ability and carry out long cycle operation tests to improve process stability and reliability.

Key Words： CO_2 capture;chemical absorption;liquid-liquid biphasic solvents;industrial application;regeneration energy consumption;viscosity

Abstract:

Keywords:

Foundation: 中国电力工程顾问集团有限公司重大科技专项资助项目(GSKJ3-J02-2021)

Authors: LIN Haizhou;WU Dawei;FAN Yongchun;LUO Bixiong;PEI Aiguo;FANG Mengxiang;

DOI: 10.13226/j.issn.1006-6772.RM23040101

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