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Effect of Oxygen Concentration on Volatile Precipitation and Critical Ignition Point
Yulong Li1,2,3, Xuechao Su2,3, Chaosheng Wang2,3
1Engineering College, Guangzhou College of Technology and Business, Guangzhou Business College, No.23, Sanhua Road, Fanhu Economic Development Zone, Leping Town, Sanshui District, Foshan City, Guangdong Province 510850, P. R. China.
The critical ignition temperature of bituminous coal significantly decreases with increased sample mass. Higher oxygen concentrations enhance coal pyrolysis, impacting ignition behavior.
Area of Science:
- Combustion Science
- Coal Chemistry
- Materials Science
Background:
- Coal ignition is a critical factor in mining safety and energy utilization.
- Understanding the influence of oxygen concentration and sample mass on coal ignition is essential for preventing spontaneous combustion.
Purpose of the Study:
- To investigate the impact of oxygen concentration on the ignition of bituminous coal.
- To determine the relationship between sample mass and critical ignition temperature.
- To analyze the chemical changes in coal during oxidation.
Main Methods:
- Large-scale oxidation experiments with varying oxygen concentrations and temperatures.
- Extraction of oxidized coals using chloroform.
- Analysis of liquid extracts via Gas Chromatography-Mass Spectrometry (GC-MS).
- Characterization of extracted oxidized coal using Fourier Transform Infrared Spectroscopy (FTIR).
Main Results:
- Critical ignition point of bituminous coal decreases by 229.4 °C as sample mass increases from 5g to 300g.
- Increased oxygen concentration enhances bituminous coal pyrolysis at constant temperatures.
- Coal oxidation activity initially decreases then increases with rising temperatures.
- Ether bond decomposition above 175 °C is linked to coal seam ignition.
Conclusions:
- Sample mass and oxygen concentration are key factors influencing bituminous coal ignition.
- FTIR and GC-MS analysis reveal chemical transformations related to coal oxidation and ignition.
- The findings provide insights into coal seam fire prevention and combustion management.
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