Jing Guosong, Zhao Qian, Jin Ziqiang
School of Transportation Engineering, Huanghe Jiaotong University, Henan, Jiaozuo, China.
Department of Civil Engineering, Henan Polytechnic University, Henan, China.
PLoS One. 2025 Mar 6;20(3):e0314162. doi: 10.1371/journal.pone.0314162. eCollection 2025.
In order to study gas adsorption performance effected by micro-rock in coal matrix, dual energy X-ray CT was used to calculate the density change of coal core before and after gas injection, which can obtain the CO2 concentration (adsorption amount) in coal core, and reveal the uneven characteristics of CO2 adsorption by minerals. The research results show that coal core in the region where minerals exist has a higher density, while the density of the coal matrix is smaller. Regions with higher coal density (more minerals) have weaker adsorption capacity for CO2. The CO2 concentration in coal core decreases approximately linearly along the axial direction of coal core from the gas injection end to the outlet section. The average voxel density is basically the same at the same coal core section before and after gas injection, which indicates that the coal matrix recovers and approaches the original state after desorption. However, before and after gas injection, the average voxel density of coal core varies greatly, and the frequency variation and average deviation factor of different voxel densities vary greatly, which indicates that the adsorption of CO2 by coal core is extremely uneven.
为研究煤基质中微岩石对瓦斯吸附性能的影响，采用双能X射线CT计算注气前后煤芯的密度变化，从而得到煤芯中的CO2浓度（吸附量），并揭示矿物对CO2吸附的不均匀特性。研究结果表明，存在矿物的区域煤芯密度较高，而煤基质密度较小。煤密度较高（矿物较多）的区域对CO2的吸附能力较弱。从注气端到出口段，煤芯中的CO2浓度沿煤芯轴向大致呈线性降低。注气前后同一煤芯截面的平均体素密度基本相同，这表明解吸后煤基质恢复并接近原始状态。然而，注气前后煤芯的平均体素密度变化很大，不同体素密度的频率变化和平均偏差因子变化很大，这表明煤芯对CO2的吸附极不均匀。
