Publications by authors named "Pi Zikun"
To study the influence of water immersion on the evolution of the groups and spontaneous combustion characteristics of coal samples with different sizes, raw coal from the Fengshuigou Coal Mine operated by Pingzhuang Coal Company in Inner Mongolia was studied. The infrared structural parameters, combustion characteristic parameters, and oxidation reaction kinetics parameters of D1-D5 water immersion coal samples were tested, and the mechanism of spontaneous combustion during the oxidation of submerged crushed coal was investigated. The results were as follows.
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- A study was conducted on high-rank coal from the Shanxi Xinjing Mine No. 9 to understand how different confining pressures affect the coal's pore structure and connectivity.
- Using low-field nuclear magnetic resonance and a vacuum water saturation system, researchers analyzed coal samples at varying pressures and found that pore sizes mainly ranged from 0.00023-24.09 μm, with micropores and small pores being predominant.
- The results indicated that as confining pressure increased, coal porosity and connectivity initially decreased, then increased, and stabilized, with a critical pressure identified at 25 MPa, providing insights for high-pressure water injection techniques in coal seams.
The adiabatic spontaneous combustion period of coal is an important index for the macroscopic characterization of coal spontaneous combustion, and it is affected by many internal and external factors. There are several methods to study it, but there are various shortcomings to these methods. Some require too much time, while others have too many interfering factors.
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