CO-PYROLYSIS KINETIC,THERMODYNAMIC AND FAST PYROLYSIS PRODUCT CHARACTERASTICS OF LONG FLAME COAL AND FURFURAL RESIDUE
The co-pyrolysis characteristics of furfural residue and low-rank long-flame coal were systematically investigated.Using thermogravimetric analyzer(TG)and infrared fast pyrolysis reactor,the effect of heating rate on the co-pyrolysis product distribution of furfural residue and long-flame coal and the synergistic effect between them were researched.TG results show that the interaction between cellulose in furfural residue and carbon-containing organic components produced by pyrolysis of long flame coal occurs in the pyrolysis range of 300～600 ℃.The activation energies calculated by KAS and FWO are 69.80～256.04 kJ/mol and 71.24～253.43 kJ/mol,respectively.At 20,30 and 40 ℃/min,the average pre-exponential factor is 1.53×1013/min(KAS)and 2.53×1013/min(FWO).The co-pyrolysis results show that:when the heating rate increases from 10 ℃/s to 30 ℃/s,the tar yield first increases from 8.67％to 9.24％,then decreases to 8.3％,the water yield decreases from 15.92％to 14.73％and then increases to 15.26％,the gas yield increases from 25.12％to 26.66％and the char yield decreases from 50.29％to 49.78％.Simulated distillation results suggest that the content of light components in tar is approximately 70％,while the proportion of heavy components is relatively small,due to the fact that the co-pyrolysis of furfural residue and long flame coal under rapid infrared heating is advantageous for tar upgrading and generates positive synergy.
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