长焰煤与糠醛渣共热解动力学、热力学及快速热解产物特性

CO-PYROLYSIS KINETIC,THERMODYNAMIC AND FAST PYROLYSIS PRODUCT CHARACTERASTICS OF LONG FLAME COAL AND FURFURAL RESIDUE

对糠醛渣和低阶长焰煤共热解特性进行系统性研究,通过采用热重分析仪(TG)、红外快速热解反应器考察升温速率对等比例混合的长焰煤和糠醛渣共热解产物分布的影响以及二者之间的协同效应。TG结果表明在300~600℃的热解区间内糠醛渣中纤维素与长焰煤热解产生的含碳有机组分发生交互作用。Kissinger-Akahira-Sunose(KAS)和Flynn-Wall-Ozawa(FWO)法计算的活化能分别在69.80~256.04 kJ/mol和71.24~253.43 kJ/mol之间;在升温速率20、30和40℃/min时,平均指前因子分别为2.55×10^(11)/s(KAS)和4.22×10^(11)/s(FWO)。糠醛渣和长焰煤红外快速共热解实验结果表明:当升温速率从10℃/s提高到30℃/s时,焦油产率先从8.67%增加到9.24%,随后又降低到8.30%,水产率从15.92%降低到14.73%又增到15.26%,气体产率从25.12%增加到26.66%而半焦从50.29%下降到49.78%。模拟蒸馏结果也表明焦油成分中轻质组分含量约为70%,重质组分相对较少,表明红外快速加热下糠醛渣与长焰煤的共热解有助于焦油提质,产生正协同作用。

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 1.53×10^(13)/min(KAS)and 2.53×10^(13)/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.