Pore and gas desorption characteristics of primary coal with different degrees of metamorphism

Pore difference characteristics and adsorption/desorption experiments of primary coal with different degrees were explored to study the pore structure gas desorption. The results show that volume increases increase in degree metamorphism. In metamorphism, distribution micropores, small pores, medium-sized pores (by volume) is WY < PM CY. large visible was > According law metamorphic coals, average diameters WY, PM, CY 68.40, 45.60, 30.50 nm, respectively. porosity specific surface area metamorphism a pattern such For pore, volumes 0.0785, 0.0587, 0.0300 mL/g, respectively, proportions 81.86%, 74.49%, 55.25%, 11.57%, 9.03%, 6.57%, areas 6.917, 5.826, 5.611 cm3/g. desorption bodies at time nodes found shows similar changes under same adsorption equilibrium pressure. higher greater amount desorption, faster amplitude. intensity significantly than which also verifies measurement constant.