Work

Experimental study on methane adsorbed-phase density, adsorption capacity and thermodynamic mechanism of anthracite coal under deep temperature and pressure conditions

Year: 2025

Type: article

Abstract: Coal adsorption capacity is the key indicator affecting the production capacity of coalbed methane. Four anthracite coal samples were subjected to isothermal adsorption experiments. Adsorption capacity of anthracite analyzed under deep reservoir conditions, and the thermodynamic mechanism of methane adsorption in anthracite was determined. The results revealed that the excess adsorption gas volume increased sharply at pressures ranging from 0~4 MPa, increased slowly at pressures ranging from 4~8 MPa, and then decreased. The methane adsorbed-phase density in coal at different temperature conditions fitted from the intercept of the linear fit between the excess adsorption gas volume and methane free-phase density was 0.218~0.322 g/cm3. Thus, methods were established to fit the methane adsorbed-phase density in coal. CBM ’s adsorbed-phase density, adsorption phase volume and theoretical maximum adsorption capacity show a negative correlation with temperature. Changes in energy during methane adsorption in anthracite coal at 30°C,45°Cand60°C was calculated. Thermodynamic mechanism and the influence mechanism of vitrinite reflectance, moisture content, and ash content on the adsorption properties of anthracite was revealed.

Source: Journal of environmental chemical engineering

DOI: 10.1016/j.jece.2025.116366

Authors: Xuefan Wang, Zhaoping Meng, Kun Zhang

Institutions: Research Institute of Petroleum Exploration and Development, China University of Mining and Technology - Beijing, Henan Polytechnic University

Language: English

Topic: Coal Properties and Utilization

Subfield: Ocean Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Climate action

Open Access status: hybrid

Estimated APC paid: $3,350