Novel Energy-Saving Process for CO2 Capture from Flue Gas in Coal-fired Power Plant
GONG Jiesong1, WANG Yuning2, ZHOU Jiabin2, CHEN Zhiyuan2, NA Wei2,3, ZHENG Min3, WANG Hua2,3, GAO Wengui2,3
1.Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2.School of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
3.State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
Abstract：The process of carbon capture using monoethanolamine (MEA) suffers from a critical problem: a large amount of reboiler heat is required to perform solvent regeneration, and in order to reduce the heat demand of the reboiler, this study provides a novel energy-saving process. The process introduced a rich solvent preheater (RSP) in a rich vapour compression (RVC) process plan, where the heat source for the RSP was the flue gas from a coal-fired power plant before desulphurisation. In order to show the synergistic effect and energy savings of the RSP+PVC process, the base process, the RVC process, the RSP process and the RVC+RSP process were modelled in Aspen Plus in this study. Afterwards, each process was analysed for energy savings and the impact of the novel coupled process and the base process on energy savings was assessed in the event of changes in operating parameters. With the introduction of RSP in the RVC process, the regeneration energy consumption per unit of CO2 captured was reduced from 3.86 MJ/kg to 2.47 MJ/kg. Compared to the base process plan, savings of 38.4% in reboiler heat consumption saving and 19% in total energy saving were achieved. The results of the evaluation showed that the coupled process was still able to provide equivalent energy savings of more than 16% at fluctuating operating parameters.
GONG Jiesong,WANG Yuning,ZHOU Jiabin et al. Novel Energy-Saving Process for CO2 Capture from Flue Gas in Coal-fired Power Plant[J]. Chemical Reaction Engineering and Technology, 2024, 40(5): 436-444.
