Abstract
Coal spontaneous combustion in the gob poses a significant threat to coal mining operations. Designing optimal process parameters for nitrogen injection to prevent and control fires efficiently is crucial. To achieve this, a multi-field coupling equation was established, considering the adsorption of coal to gas. The model’s accuracy was verified on-site, and the effects of nitrogen injection at different locations and flow rates were simulated. The optimal injection parameters were determined by analyzing temperature and inerting time. The results showed that the coal spontaneous combustion hazardous zone in the gob tested on-site was consistent with the simulation from the perspective of physisorption. Nitrogen injection had three stages: gas expansion, rapid oxygen dilution, and complete inerting. The nitrogen injection effect presented a nonlinear change in injection location and flow rate. The optimal nitrogen injection location for the Tingnan Coal Mine in Shaanxi was determined to be 90 m behind the working face on the inlet side, with an optimal flow rate of 800 m3/min. This study focused on gas adsorption and offered valuable insights for creating high-efficiency fire-fighting techniques that involve inserting in the gob.
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The data used to support the findings of this study are available from the corresponding author upon request.
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This work was supported by the National Natural Science Foundation of China (52074156) and the College Students’ Innovative Entrepreneurial Training Plan Program (202312038).
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XF: methodology, formal analysis, writing—original draft, visualization. BT: methodology, writing—review and editing. HW: funding, methodology, writing—review and editing. FW: formal analysis, visualization; ZZS: investigation, formal analysis. CX: investigation. SZ: investigation.
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Fang, X., Tan, B., Wang, H. et al. Investigation on preventive inerting approach of coal spontaneous combustion in gob considering adsorption effect. Environ Sci Pollut Res 30, 112892–112907 (2023). https://doi.org/10.1007/s11356-023-30217-0
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DOI: https://doi.org/10.1007/s11356-023-30217-0