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To investigate the impact of different injection source gases on the adsorption and diffusion behavior of methane (CH4) in coal，three types of gases were selected: hot gas power generation exhaust (heat injection，multi-component)，carbon dioxide (CO2) at room temperature (strong adsorption，single component)，and nitrogen (N2) at room temperature (weak adsorption，single component). Using giant canonical Monte Carlo (GCMM) and molecular dynamics (MD) methods，these gases were mixed with CH4 and injected into coal to analyze the adsorption conditions. Based on a fixed amount of CH4，the changes in diffusion behavior were analyzed after injecting each of the three gases. The results show that with the increase of gas injection ratio，the reduction of CH4 adsorption capacity under CO2 injection condition is gradually greater than that under thermal power generation tail gas condition，showing better inhibition performance than thermal power generation tail gas. In contrast，although the adsorption capacity of CH4 decreases after N2 injection，it is always greater than the previous two. In terms of diffusion，with the increase of gas injection ratio，the diffusion coefficient increases first and then decreases，and the coefficient is always larger than before gas injection，and the displacement gas mainly promotes CH4 diffusion. Under N2 injection，the diffusion coefficient of CH4 is the highest and the decrease is the smallest，and the promoting effect is the most obvious. Under the condition of CO2 injection，the diffusion coefficient of CH4 decreases the most and the promoting effect is the weakest. Therefore，the selection of hot tail gas from gas-fired power generation for CH4 displacement is more cost-effective.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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