New process development and process evaluation for capturing CO2 in flue gas from power plants using ionic liquid [emim][Tf2N]

doi:10.1016/j.cjche.2019.08.005

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (3): 721-732.DOI: 10.1016/j.cjche.2019.08.005

• Separation Science and Engineering • 上一篇下一篇

New process development and process evaluation for capturing CO₂ in flue gas from power plants using ionic liquid [emim][Tf₂N]

Lan Li^1,2,3, Xiaoting Huang^1,2,3, Quanda Jiang⁴, Luyue Xia¹, Jiawei Wang⁵, Ning Ai^1,2,3

1 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2 Zhejiang Province Key Laboratory of Biomass Fuel, Hangzhou 310014, China;
3 Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, Hangzhou 310014, China;
4 Zhejiang Supcon Software Co., Ltd, Hangzhou 310014, China;
5 School of Engineering & Applied Science, Aston University, Birmingham B4 7ET, W Midlands, England, UK

收稿日期:2019-05-15 修回日期:2019-08-05 出版日期:2020-03-28 发布日期:2020-06-11
通讯作者: Ning Ai
基金资助:
This work was financially supported by the Zhejiang Provincial Natural Science Foundation of China (LY16B060014), State Key Laboratory of Chemical Engineering (No. SKL-ChE-08A01) and the Innovation and Development of Marine Economy Demonstration.

New process development and process evaluation for capturing CO₂ in flue gas from power plants using ionic liquid [emim][Tf₂N]

Lan Li^1,2,3, Xiaoting Huang^1,2,3, Quanda Jiang⁴, Luyue Xia¹, Jiawei Wang⁵, Ning Ai^1,2,3

1 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2 Zhejiang Province Key Laboratory of Biomass Fuel, Hangzhou 310014, China;
3 Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, Hangzhou 310014, China;
4 Zhejiang Supcon Software Co., Ltd, Hangzhou 310014, China;
5 School of Engineering & Applied Science, Aston University, Birmingham B4 7ET, W Midlands, England, UK

Received:2019-05-15 Revised:2019-08-05 Online:2020-03-28 Published:2020-06-11
Contact: Ning Ai
Supported by:
This work was financially supported by the Zhejiang Provincial Natural Science Foundation of China (LY16B060014), State Key Laboratory of Chemical Engineering (No. SKL-ChE-08A01) and the Innovation and Development of Marine Economy Demonstration.

摘要/Abstract

摘要： Using the ionic liquid [emim][Tf₂N] as a physical solvent, it was found by Aspen Plus simulation that it was possible to attempt to capture CO₂ from the flue gas discharged from the coal-fired unit of the power plant. Using the combination of model calculation and experimental determination, the density, isostatic heat capacity, viscosity, vapor pressure, thermal conductivity, surface tension and solubility of [emim][Tf₂N] were obtained. Based on the NRTL model, the Henry coefficient and NRTL binary interaction parameters of CO₂ dissolved in [emim][Tf₂N] were obtained by correlating [emim][Tf₂N] with the gas-liquid equilibrium data of CO₂. Firstly, the calculated relevant data is imported into Aspen Plus, and the whole process model of the ionic liquid absorption process is established. Then the absorption process is optimized according to the temperature distribution in the absorption tower to obtain a new absorption process. Finally, the density, constant pressure heat capacity, surface tension, thermal conductivity, and viscosity of [emim][Tf₂N] were changed to investigate the effect of ionic liquid properties on process energy consumption, solvent circulation and heat exchanger design. The results showed that based on the composition of the inlet gas stream to the absorbers, CO₂ with a capture rate of 90% and a mass purity higher than 99.5% was captured. These results indicate that the [emim][Tf₂N] could be used as a physical solvent for CO₂ capture from coal-fired units. In addition, the results will provide a theoretical basis for the design of new ionic liquids for CO₂ capture.

关键词: Ionic liquids, CO₂ capture, Aspen Plus process simulation, New green physical solvents, Flue gas

Abstract: Using the ionic liquid [emim][Tf₂N] as a physical solvent, it was found by Aspen Plus simulation that it was possible to attempt to capture CO₂ from the flue gas discharged from the coal-fired unit of the power plant. Using the combination of model calculation and experimental determination, the density, isostatic heat capacity, viscosity, vapor pressure, thermal conductivity, surface tension and solubility of [emim][Tf₂N] were obtained. Based on the NRTL model, the Henry coefficient and NRTL binary interaction parameters of CO₂ dissolved in [emim][Tf₂N] were obtained by correlating [emim][Tf₂N] with the gas-liquid equilibrium data of CO₂. Firstly, the calculated relevant data is imported into Aspen Plus, and the whole process model of the ionic liquid absorption process is established. Then the absorption process is optimized according to the temperature distribution in the absorption tower to obtain a new absorption process. Finally, the density, constant pressure heat capacity, surface tension, thermal conductivity, and viscosity of [emim][Tf₂N] were changed to investigate the effect of ionic liquid properties on process energy consumption, solvent circulation and heat exchanger design. The results showed that based on the composition of the inlet gas stream to the absorbers, CO₂ with a capture rate of 90% and a mass purity higher than 99.5% was captured. These results indicate that the [emim][Tf₂N] could be used as a physical solvent for CO₂ capture from coal-fired units. In addition, the results will provide a theoretical basis for the design of new ionic liquids for CO₂ capture.

Key words: Ionic liquids, CO₂ capture, Aspen Plus process simulation, New green physical solvents, Flue gas

Lan Li, Xiaoting Huang, Quanda Jiang, Luyue Xia, Jiawei Wang, Ning Ai. New process development and process evaluation for capturing CO₂ in flue gas from power plants using ionic liquid [emim][Tf₂N][J]. 中国化学工程学报, 2020, 28(3): 721-732.

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New process development and process evaluation for capturing CO₂ in flue gas from power plants using ionic liquid [emim][Tf₂N]

New process development and process evaluation for capturing CO₂ in flue gas from power plants using ionic liquid [emim][Tf₂N]

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