Abstract:
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 °C. 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 °C/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 °C/s to 30 °C/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.