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Study on the characteristic patterns of liquid CO2 solubilization effects on the thermokinetics of bituminous coal oxidation at low temperatures: A case study of two bituminous coals
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DOI：10.1016/j.csite.2026.108396.png)
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Abstract
En 中文
The aim of this study is to explore how the solubilization of liquid CO2 influences the characteristics of exothermic oxidation at low temperatures in long-flamed coal (Sample 1) and 1/3 coking coal (Sample 2). First, liquid CO2 solubilization was performed on the coal samples using a low-temperature constant-pressure apparatus. The pore characteristics of the solubilized coal-oxygen system were simultaneously measured. Finally, the oxidation exothermic properties of both coal samples before and after solubilization were tested using a C80 microcalorimeter. Experimental results indicate that liquid CO2 Solubilization significantly alters the pore distribution of coal samples. It modifies the proportion of different pore sizes and the number of various pores on the coal surface to varying degrees, promoting the expansion of micropores (<10 nm) into transition pores (10–100 nm) and macropores (>1000 nm). This forms a interconnected fissure network, enhancing oxygen diffusion rates and coal-oxygen contact efficiency. The low-temperature oxidation process of the leached coal samples exhibited a higher heat release rate during the rapid exothermic phase, accompanied by a decrease in apparent activation energy and an increased tendency toward spontaneous combustion. The study revealed that liquid CO2 Solubilization enhances the oxidation activity of coal by increasing its surface area through pore restructuring, providing a theoretical basis for preventing spontaneous combustion in coal mines and optimizing combustion efficiency.
Keywords:
Liquid CO2 solubilization
Coal pore structure
Low-temperature oxidation
Thermodynamic analysis
Apparent activation energy
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