The releasing characteristics of gas species during isothermal co-pyrolysis of pine sawdust (PS) and coal slime (CS) were studied in a micro fluidized bed reactor.Four main pyrolysis gaseous products

CH4

CO

CO2 and H2

were investigated under different temperature and blending ratios.The kinetic parameters were calculated employing the universal integral method to examine the interaction of PS and CS during co-pyrolysis.It was observed by FT-IR that CS mainly contained aromatic compounds carrying C-O and C==O

while the PS was mainly consist of long-chain aliphatic hydrocarbon with-OH.The gas forming reaction rate of PS was higher than that of CS

and its value increased in a certain extent with the increase of biomass blending ratio.The kinetic parameters of pyrolysis gas formation of PS

CS and their blends were obtained by the mechanism function models

and the most probable mechanism function was determined by comparing the experimental and calculated values.The effect of blending PS and CS on the forming activations of the four gas species varied obviously.The activation energies of CO were significantly lower than the calculated ones

indicating that a positive synergistic effect existed between PS and CS.The co-pyrolysis reaction led to a negative effect on the formation of H2 at a PS blending ratio of 75% as the activation energy was obviously higher than the calculated one.In comparison

biomass blending showed relatively small positive synergistic effect on the formation of CH4

while that of CO2 depended upon the blending ratio significantly.