期刊
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
卷 175, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cep.2022.108932
关键词
natural gas hydrates; carbon dioxide capture; carbon dioxide storage; replacement; methane recovery
This study investigates the thermodynamic and kinetic features of the methane replacement process using CO2-N-2 mixed gas. The results show that the conditions for hydrate formation in the mixed gas are gentler, with the lowest concentration of CO2 in the gaseous phase at a 50% CO2 concentration. The capture rate of N-2 and CO2 increases with decreasing N-2 concentration.
To better investigate the thermodynamic and kinetic features of the methane replacement process, this study established the phase equilibrium conditions of compound hydrate production and gas capture in mixed gas CO2- N-2 with the CO2 concentration of 40%, 50%, and 70%. The results revealed that the hydrate formation circumstances in the mixed gas were gentler, and the experiment with CO2-N-2 (50/50 vol percent) produced the lowest concentration of CO2 in the gaseous phase that stayed above hydrate. In this study, as the N-2 concentration in the mixture decreased, the capture rate of N-2 and CO2 increased, as did the recovery of CH4. Finally, the highest percentage of CO2 captured from the gaseous phase reached up to 96.3% and CH4 recovered from the solid phase reached 48.44% when the CO2/N-2 70-30 vol% flue-gas was used.
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