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<p>Adjustment of methane adsorption and desorption properties in coal is important for the high drainage rate and drainage effect of coalbed methane (CBM). The main characteristics of CBM reservoirs in the Qinshui coalfield of Shanxi Province are low pressure and low permeability of CBM. These conditions result in limited methane extraction and significant fluctuations in gas concentration. Revising the adsorption and desorption properties of CBM can improve both the extraction rate and efficiency. An attempt was made to revise the adsorption and desorption characteristics of methane in coal by adding an electric field. This study focuses on No. 3 anthracite in the southern Qinshui coalfield. Elemental analysis was conducted, and an electric field was used as a physical field to develop an experimental apparatus for electric field-revised CBM adsorption and desorption. This apparatus was used to test the adsorption properties of CBM, and X-ray photoelectron spectroscopy (XPS) was employed to examine the surface chemistry of coal. The types and relative contents of functional groups on the coal surface were analyzed. Additionally, the relationship between the electric field’s influence on CBM adsorption and the changes in functional groups on the coal surface was investigated. The experimental results indicate that the application of an electric field changes methane adsorption from coal, adhering to the Langmuir theory model. The impact of voltage on methane adsorption capacity and adsorption isotherms is greater than that of frequency. Moreover, as the intensity of the electric field increases, the maximum adsorbed quantity <i>V</i><sub><i>m</i></sub> demonstrates a linear decrease while the empirical adsorbed constant <i>B</i> exhibits an exponential decline. The functional groups on the coal surface primarily include C–C/C–H bonds, C-O bonds, C = O carbonyl groups, and COO- carboxyl or quinone groups. Under the influence of the electric field, the functional groups on the coal surface are modified. The relative content of C–C/C–H bonds decreases, resulting in an increase in the relative content of C–O bonds, C = O carbonyl groups, and COO- carboxyl or quinone groups. The findings revealed that electric field action diminished the methane adsorption capacity in coal.</p>

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Influences of electric field action on methane adsorption properties in anthracite: an experimental study

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Wenmei Han,
  • Zhaoying Chen,
  • Hongtai Liu,
  • Qi Yuan

摘要

Adjustment of methane adsorption and desorption properties in coal is important for the high drainage rate and drainage effect of coalbed methane (CBM). The main characteristics of CBM reservoirs in the Qinshui coalfield of Shanxi Province are low pressure and low permeability of CBM. These conditions result in limited methane extraction and significant fluctuations in gas concentration. Revising the adsorption and desorption properties of CBM can improve both the extraction rate and efficiency. An attempt was made to revise the adsorption and desorption characteristics of methane in coal by adding an electric field. This study focuses on No. 3 anthracite in the southern Qinshui coalfield. Elemental analysis was conducted, and an electric field was used as a physical field to develop an experimental apparatus for electric field-revised CBM adsorption and desorption. This apparatus was used to test the adsorption properties of CBM, and X-ray photoelectron spectroscopy (XPS) was employed to examine the surface chemistry of coal. The types and relative contents of functional groups on the coal surface were analyzed. Additionally, the relationship between the electric field’s influence on CBM adsorption and the changes in functional groups on the coal surface was investigated. The experimental results indicate that the application of an electric field changes methane adsorption from coal, adhering to the Langmuir theory model. The impact of voltage on methane adsorption capacity and adsorption isotherms is greater than that of frequency. Moreover, as the intensity of the electric field increases, the maximum adsorbed quantity Vm demonstrates a linear decrease while the empirical adsorbed constant B exhibits an exponential decline. The functional groups on the coal surface primarily include C–C/C–H bonds, C-O bonds, C = O carbonyl groups, and COO- carboxyl or quinone groups. Under the influence of the electric field, the functional groups on the coal surface are modified. The relative content of C–C/C–H bonds decreases, resulting in an increase in the relative content of C–O bonds, C = O carbonyl groups, and COO- carboxyl or quinone groups. The findings revealed that electric field action diminished the methane adsorption capacity in coal.