Adsorption Factors in Enhanced Coal Bed Methane Recovery: A Review

Theodora Noely Tambaria,Ronald Nguele,Yuichi Sugai

doi:10.3390/gases2010001

Theodora Noely Tambaria, Ronald Nguele + Show 1 more

Open Access

https://doi.org/10.3390/gases2010001

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Journal: Gases	Publication Date: Jan 14, 2022
Citations: 12	License type: CC BY 4.0

Affiliation: Kyushu University, Universitas Gadjah Mada

Abstract

Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and modeling have been used to assess gas adsorption and its effects, including volumetric and gravimetric techniques, as well as the Ono–Kondo model and other numerical simulations. Thermodynamic parameters may be used to model adsorption on coal surfaces while adsorption isotherms can be used to predict adsorption on coal pores. In addition, density functional theory and grand canonical Monte Carlo methods may be employed. Complementary analytical techniques include Fourier transform infrared, Raman spectroscopy, XR diffraction, and 13C nuclear magnetic resonance spectroscopy. This review summarizes the cutting-edge research concerning the adsorption of CO2, N2, or mixture gas onto coal surfaces and into coal pores based on both experimental studies and simulations.

Highlights

Coal bed methane (CBM) has been extracted from coal seams for many years [1]
This review examined various aspects of gas adsorption by coal during enhanced CBM (ECBM) extraction
Experimental data show that adsorption is inhibited on wet coal because the adsorption sites are occupied by water molecules

Summary

Introduction

Coal bed methane (CBM) has been extracted from coal seams for many years [1]. This methane is held in micropores [2] and so numerous methods have been developed based on gas injection techniques to remove the maximum possible amount of methane from these micropores. Gas injection has been found to provide maximum methane recovery of up to 90% [11]. The gases commonly used in enhanced CBM (ECBM) recovery are carbon dioxide (CO2 ) and nitrogen (N2 ) or and mixture of the two [12,13,14,15]

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