Thermogravimetric and thermal properties analysis of bituminous coal from coalfield fire area

This paper combined the thermogravimetry TG209F1 Libra with Netzsch LFA 457 to study the thermogravimetric behaviours from 25 degrees C-650 degrees C and measured thermal properties from 25 degrees C-300 degrees C for bituminous coals taken from Wuda coalfield. The characteristic temperatures and different stages of reaction were determined using thermogravimetry (TG-DTG). The thermal diffusivity of the bituminous coal decreases with increasing temperature (from 0.11 +/- 0.03 mm(2) x s(-1) to 0.078 + 0.02 mm(2) x s(-1), depending on the material). Moreover, the specific heat capacity of coal samples presented closely a linear increase with increasing temperature up to 300 degrees C, thermal conductivity of coal appeared a cubic polynomial growth (0.117 - 0.175 W / (m x K)). It might happen because that the thermal expansion plays a more important role than the release of gases and volatile on the quantity of pores.