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Dynamics adsorption of the enhanced CH4 recovery by CO2 injection |
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| Authors: | Min Gu Shuo Duan Qirong Wu |
| Affiliation: | 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing, China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing, China
School of Mining and Geomatics, Hebei University of Engineering, Handan, China Contribution: Data curation, Formal analysis, Funding acquisition, ?Investigation, Methodology, Writing - review & editing;3. SPIC (State Power Investment Corporation) Yuanda Environmental Protection Engineering Co., Ltd., Chongqing, China Contribution: ?Investigation, Methodology |
| Abstract: | The dynamic adsorption isotherms of CO2-EGR were measured by using an Intelligent Gravimetric Analysis system. In the initial CO2 injecting stage, all the injected CO2 enters into the adsorbent and the mole fraction of CH4 in the gas phase ( ) is maintained at 1.0. The CH4 recovery factor ( ) increases. The duration of this stage (tCD) depends on the selectivity of CO2 over CH4 ( ). An adsorbent with large  has long tCD. In the second stage, the injected CO2 competes with CH4 for adsorption. The cumulative  of the second stage is much larger than that of the initial stage. However,  decreases sharply.  in the whole CO2 injection is always larger than that before CO2 injection, suggesting that CH4 desorption results from the displacement of CO2 rather than from pressure depletion. |
| Keywords: | CO2-EGR dynamic adsorption isotherm the adsorption selectivity of CO2 over CH4 the CH4 recovery factor the mole fraction of CH4 in the gas phase |
