二氧化碳煤層封存之等溫吸／脫附模式研究

CO2 Adsorption / Desorption Modeling for CO2 Sequestration in Coal-Bed

梁閎森(Hong-Sen Liang) ； 黃德坤(Te-Kun Huang) ； 吳素慧(Suh-Huey Wu) ； 陳大麟(Ta-Lin Chen)

《臺灣鑛業》 64卷4期 (2012/12) Pp. 38-51

https://doi.org/10.30014/TMI.201212.0006

摘要

溫室效應問題倍受重視的今日，二氧化碳減量為世界各國正積極研究的方向之一。在所有二氧化碳減量的措施中，地質封存為目前相當熱門之話題。地質封存包含深海封存、構造封存及煤層吸附封存等，其中利用煤層進行吸附封存更可有增加煤層氣採收（CO2-Enhanced Coalbed Methane）之經濟效應，相當具有研究潛力。二氧化碳在煤層封存之研究中，代表煤層吸附二氧化碳潛能之等溫吸／脫附能力為首要瞭解的課題。故建立等溫吸／脫附試驗與分析技術，為評估二氧化碳之煤層封存相當重要的一環。本研究於台灣中油探採研究所，建立煤層氣等溫吸／脫附實驗室與分析技術。利用臺灣新平溪、澳洲Sydney 盆地與印尼Pinang 煤樣，進行二氧化碳之等溫吸／脫附試驗。等溫吸／脫附試驗數據藉由Langmuir、BET及Dubinin-Astakhov（D-A）等溫吸／脫附曲線之數學模式進行擬合，並利用殘差分析評估各等溫吸／脫附曲線之適用性。根據等溫吸／脫附試驗成果，發現印尼Pinang煤礦具有明顯脫附滯後現象；臺灣新平溪與澳洲Sydney盆地煤礦之吸－脫附則較為同步。另由試驗結果可知二氧化碳封存潛力方面，印尼Pinang煤礦較佳、Sydney盆地煤礦次之，臺灣新平溪煤礦較差。而在等溫吸／脫附曲線之數學模式方面，根據殘差分析結果可知D-A模式較適用於煤礦等溫吸／脫附曲線之描述與分析。

關鍵字

煤礦 ； 等溫吸／脫附曲線模式 ； 脫附滯後現象 ； 二氧化碳煤層封存

並列摘要

Disposal and geological sequestration of anthropogenic ”greenhouse gases” such as carbon dioxide (CO2) is a proposed approach to reduce global warming. Deep sea, regional-scale geological structure, and coal seam are possible sites for sequestration, given their ubiquitous nature. A thorough study of the sorption behavior of coals to CO2 is critical for carbon sequestration in coal seams and enhanced coalbed methane recovery.This paper discusses the results of an ad/de-sorption study of CO2, in single gas environment, on a set of coal samples taken from the Hsin-Ping-Chi Colliery (Taiwan), Sydney Basin (Australia), and Pinang (Indonesia). The experimental data were modeled using Langmuir, BET, and Dubinin-Astakhov (D-A) equations. The accuracy of the models in quantifying coal-gas sorption was compared using an error analysis technique. For CO2, the performance of the D-A equation was found to be significantly better than the other two. Overall, the D-A equation fitted the experimental sorption data the best, followed by the Langmuir and BET equations. Since the D-A equation is capable of deriving isotherms for any temperature using a single isotherm, thus providing added flexibility to model the temperature variation due to injection / depletion, this is the recommended model to use.

並列關鍵字

Coal ； Ad/de-sorption CO2 Adsorption / Desorption Modeling for CO2 Sequestration in Coal-Bedisotherm ； Sorption hysteresis ； CO2 sequestration