Research Article
Numerical Simulation of Coupled Thermal-Hydrological-Mechanical-Chemical Processes in the Spontaneous Combustion of Underground Coal Seams
Table 1
Parameters for the numerical simulation.
| | Parameter | Value | Unit |
| | Young’s modulus, | 3 | | | Poisson’s ratio, | 0.30 | 1 | | Matrix porosity, | 0.01 | — | | Fracture porosity, | 0.03 | — | | The density of matrix, | 2300 | | | Specific heat of matrix, | 1250 | | | Specific heat of gas, | 2160 | | | Thermal expansion coefficient, | | K-1 | | Langmuir pressure constant, | 2.7 | MPa | | Gas dynamic viscosity, | | Pa·s | | Isosteric heat of adsorption, | 15000 | J/mol | | Langmuir strain constant, | 0.005 | — | | Langmuir volume constant, | 0.045 | m3/kg | | Attenuation coefficient, | | — | | Initial permeability, | | m/s | | Initial temperature, | 300 | K | | Thermal conductivity of coal, | 0.2 | W/(m·K) |
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