Dynamics adsorption of the enhanced CH4 recovery by CO2 injection

被引：5

作者：

Gu, Min ^{[1
]}

Duan, Shuo ^{[1
,2
]}

Wu, Qirong ^{[3
]}

机构：

[1] Chongqing Univ, Sch Resources & Safety Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China

[2] Hebei Univ Engn, Sch Min & Geomat, Handan, Peoples R China

[3] Yuanda Environm Protect Engn Co Ltd, SPIC State Power Investment Corp, Chongqing, Peoples R China

来源：

AICHE JOURNAL | 2021年 / 67卷 / 10期

关键词：

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; COAL-BED METHANE; SELECTIVE ADSORPTION; CARBON-DIOXIDE; PORE STRUCTURE; SHALE; ENRICHMENT; SYSTEMS;

D O I：

10.1002/aic.17346

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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 (yCH4) is maintained at 1.0. The CH4 recovery factor (RCH4) increases. The duration of this stage (t(CD)) depends on the selectivity of CO2 over CH4 (SCO2/CH4). An adsorbent with large SCO2/CH4 has long t(CD). In the second stage, the injected CO2 competes with CH4 for adsorption. The cumulative RCH4 of the second stage is much larger than that of the initial stage. However, yCH4 decreases sharply. pCH4 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.

引用

页数：8

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