城市生活垃圾与生物质成型燃料混合热解特性及动力学研究

CO-PYROLYSIS CHARACTERISTICS AND KINETIC ANALYSIS OF MUNICIPAL SOLID WASTE AND BIOMASS BRIQUETTE

采用热重分析法对城市生活垃圾(MSW)、棉秆成型颗粒(CSB)及混合样品的热解特性进行研究,实验分别在3种升温速率(10、20、40℃/min)下进行,温度从室温升到1000℃,并通过Kissinger-Akahira-Sunose(KAS)方法计算其热解过程中的活化能。结果表明:20℃/min升温速率下,MSW比CSB在DTG曲线中多一个失重峰,伴随升温速率的提高,实验样品的DTG曲线均向高温方向发生偏移,热滞后现象明显。MSW和CSB混合热解过程中发生协同效应,高温阶段协同作用更为明显。动力学分析得出MSW比CSB平均活化能高,当CSB掺混比例为80%时,混合物平均活化能达到最小值,仅为111.25 kJ/mol。

The pyrolysis characteristics of municipal solid waste(MSW),cotton straw briquette(CSB)and their blends were investigated by thermogravimetric analysis. The experiments were conducted at three heating rates(10,20 and 40 ℃/min)and the working temperature range was between room temperature and 1000 ℃. And the activation energy during pyrolysis process was calculated by the Kissinger-Akahira-Sunose(KAS)method. The results show that MSW has one more weight loss peak than CSB in the DTG curves at the heating rate of 20 ℃/min. With the increase of heating rate,the DTG curves of experimental samples are shifted to the high temperature side,and the thermal hysteresis phenomenon is significant. There existed synergistic interaction between the co-pyrolysis process of MSW and CSB,especially at high temperature stage. The kinetic analysis shows that the average activation energy of MSW is higher than that of CSB. When the percentage of CSB is 80%,the average activation energy of the blends reachs the minimum number,which is only 111.25 kJ/mol.