1. Multi-stage solvent circulation absorption enhancement: System optimization for energy-saving CO2 capture.
- Author
-
Liu, Chang, Shao, Lingyu, Pan, Chengjin, Xu, Feng, Wu, Zhicheng, Zhao, Zhongyang, Chen, Yaoji, Fan, Haidong, Zheng, Chenghang, and Gao, Xiang
- Subjects
- *
CARBON sequestration , *MATHEMATICAL optimization , *CARBON dioxide , *SOLVENTS , *SUPERABSORBENT polymers , *HEAT losses - Abstract
[Display omitted] • Multi-stage circulation process enhanced CO 2 capture/regeneration performance. • The CO 2 loading of the rich MEA solvent was up to 0.514 mol CO 2 /mol amine. • The CO 2 regeneration duty reached 2.02 GJ/t CO 2 using NH 3 /K 2 CO 3 solution. One of the major barriers in industrial applications of solvent-based CO 2 capture is the significant energy consumption required for absorbent regeneration. In this study, a novel multi-stage circulation (MSC) CO 2 absorption process was proposed, which implemented independent regulation of each stage, resulting in enhanced CO 2 capture performance and reduction of CO 2 regeneration duty. The MSC absorber was designed with four stages from bottom to top, each serving distinct functions, including CO 2 enrichment, CO 2 main absorption, CO 2 capture efficiency enhancement and aerosol capture. Simulation of the MSC process achieved a rich ethanolamine (MEA) solvent CO 2 loading of 0.512–0.570 mol CO 2 /mol amine, which was 8.1 %–9.9 % higher than typical process. The effects of test duration, amine solution flow rates, reaction temperatures and inlet CO 2 concentrations on CO 2 absorption performance were studied using the MSC experimental platform. The CO 2 regeneration duty reduced by over 13.2 % of the MSC process compared to a typical process using 25 wt% MEA solution and by over 22.9 % using piperazine (PZ)/N-methyldiethanolamine (MDEA) solution. Furthermore, the utilization of NH 3 /K 2 CO 3 solution achieved an energy consumption reduction of over 41.7 %, resulting in a CO 2 regeneration duty as low as 2.02 GJ/t CO 2 (1.84 GJ/t CO 2 , subtracting the heat loss). Meanwhile, potential strategies for optimizing parameters of MSC process were proposed to address the complex and volatile conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF