LAUSR

The coupling pyrolysis and gasification (CPG) process in the fluidized bed reactor to produce methane-rich syngas is an attractive technology in efficient and clean utilization of coals. Pyrolysis plays a leading role in this technology and other relevant processes. Pyrolysis behavior, gaseous product evolution, and kinetics of a calcium-rich high-volatile bituminous coal were deeply investigated using thermogravimetry coupled with online Fourier transform infrared spectroscopy. The results showed that inherent minerals in the coal were mainly gypsum, calcite, and quartz. Except for SiO2, CaO is the most abundant species in the coal ash. The first-stage mass loss of coal before 654 °C was attributed to functional group cleavage and aromatic ring condensation reactions, during which the relative content of CH4 was the largest among the hydrocarbon gases. The second-stage mass loss was mainly caused by mineral (calcite and gypsum) decomposition. It has demonstrated that the major source of CH4 formation was...