Experimental Research on the Law of Energy Conversion during CO 2 Sequestration in Coal

Tao Gao, Cunbao Deng and Qing Han
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Tao Gao: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Jinzhong 030600, China
Cunbao Deng: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Jinzhong 030600, China
Qing Han: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Jinzhong 030600, China

Energies, 2021, vol. 14, issue 23, 1-12

Abstract: CO 2 sequestration in coal is mainly attributed to adsorption. The adsorption experiments of CO 2 were conducted at injection pressures ranging from 1 to 3 MPa on coal samples with five kinds of particle sizes. The fitting degree of four classical adsorption models to experimental adsorption data was systematically compared. The adsorption properties of CO 2 were comprehensively discussed. The temperature changes of coal samples at different positions during CO 2 adsorption were measured by using the improved adsorption tank, and then the energy conversion law was obtained. The results showed increasing gas injection pressure can effectively increase the adsorption capacity of CO 2 on coal samples. The BET equation had the best fitting accuracy for CO 2 adsorption on various size coal samples. There was a significant exothermic effect during CO 2 adsorption and storage. With the rise of injection pressure, the peak value of the rising temperature of coal samples increased, but the change rate decreased. The maximum temperature rise of coal samples was up to 13.6 °C at 3 MPa, which should be of great concern for the prevention of coal spontaneous combustion. During the sequestration process of CO 2 , the adsorption resulted in a decrease in coal surface free energy and then partial conversion to heat, leading to the rise of coal temperature. In addition, the CO 2 adsorption on the pore surface caused the expansion and deformation of coal.

Keywords: particle size; CO 2 sequestration; adsorption model; temperature; energy conversion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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