Combined energy consumption and CO2 capture management: Improved acid gas removal process integrated with CO2 liquefaction

被引:17
作者
Chen, Jianjun [1 ]
Lam, Hon Loong [2 ]
Qian, Yu [1 ,3 ]
Yang, Siyu [1 ,3 ]
机构
[1] South China Univ Technol, Sch Chem Engn, Guangzhou 510640, Peoples R China
[2] Univ Nottingham Malaysia Campus, Ctr Excellence Green Technol, Jalan Broga, Semenyih 43500, Malaysia
[3] South China Univ Technol, Guangdong Key Lab Green Chem Prod Technol, Guangzhou 510640, Peoples R China
基金
中国国家自然科学基金;
关键词
Rectisol wash; CO2; liquefaction; Cold energy; Carbon capture rate; Exergy analysis; Techno-economic analysis; TECHNOECONOMIC ANALYSIS; CARBON-DIOXIDE; COAL-GASIFICATION; CONCEPTUAL DESIGN; SHALE GAS; RECTISOL; EXERGY; OPTIMIZATION; SIMULATION; RECOVERY;
D O I
10.1016/j.energy.2020.119032
中图分类号
O414.1 [热力学];
学科分类号
摘要
Energy management is always facing a trade-off among the constrains of efficiency, energy consumption and CO2 capture rate. For example, the Rectisol wash is a promising and efficient purification process for acid gas removal. However, this process has the problems of high cold energy consumption and low CO2 capture rate. To solve the problems, this paper proposed an improved integrated Rectisol (Int-Rectisol) process with CO2 partial liquefaction. This paper demonstrated how to comprehensively reduce the energy consumption by liquefying part of the CO2 from the treated syngas before absorption. The decreased CO2 concentration in the syngas consequently reduced the methanol solvent consumption and regeneration in the process. Meanwhile, less solvent circulation and regeneration further reduced the energy consumption of the overall process. Process modeling and simulation was conducted in Aspen Plus. The techno-economic performance was then evaluated and compared with the conventional process. The results showed that the solvent circulation in the Int-Rectisol process reduced by 46.5% and the energy consumption decreased from 389.1 MJ to 204.3 MJ for capturing 1 kg of CO2. Meanwhile, the CO2 capture rate also increased from 46.7% to 85%. The exergy analysis showed that the exergy destruction in the Int-Rectisol was 20.95 MW less than the Rectisol process. As for the economic benefit, the Int-Rectisol process reduced the total capital investment and the total product cost by 12.4% and 8.7%, respectively. (c) 2020 Elsevier Ltd. All rights reserved.
引用
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页数:16
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