Pyrolysis Characteristics and Kinetics of Municipal Solid Waste
Pyrolysis Characteristics and Kinetics of Municipal Solid Waste
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发表时间：
2005
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通讯作者：
李海英;张书廷;赵新华;Eiji;Suzuki
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作者：
李海英;张书廷;赵新华;Eiji;Suzuki
在系统调研的基础上，利用专用热解反应器，克服热重分析仪的不足，研究了不同条件下城市生活垃圾的热解特性和表观动力学。采用热重分析法（TG）研究了城市生活垃圾在4.8、6.6、8.4、12.0和13.2K/min速率下的热解行为，并在不同功能区研究了城市生活垃圾的热解特性。城市生活垃圾的热解是一个复杂的反应过程，根据实验结果可以发现热解的三个主要阶段。第一阶段为纤维素和半纤维素的降解，最大降解速率出现在150 ℃ ~ 200 ℃，第二阶段为中间产物的脱氯化氢和解聚，差热重（DTG）曲线在300 ℃左右出现肩峰;第三阶段为400 ℃ ~ 600 ℃下残余大分子有机物和木质素的分解。在给定的实验条件范围内，非线性拟合算法与实验结果吻合较好，相关系数均在0.99以上。动力学特性与物料成分和升温速率有关。反应活化能随升温速率的增大而减小。
Based on a systemic survey, the pyrolysis characteristics and apparent kinetics of the mu- nicipal solid waste (MSW) under different conditions were researched using a special pyrolysis re- actor, which could overcome the disadvantage of thermo-gravimetric analyzer. The thermal decom- position behaviour of MSW was investigated using thermo-gravimetric ( TG ) analysis at rates of 4.8, 6.6, 8.4, 12.0 and 13.2 K/min. The pyrolysis characteristics of MSW were also studied in dif- ferent function districts. The pyrolysis of MSW is a complex reaction process and three main stages are found according to the results. The first stage represents the degradation of cellulose and hemi- cellulose, with the maximum degradation rate occuring at 150 °C—200 °C; the second stage repre- sents dehydrochlorination and depolymerization of intermediate products and the differential thermo- gravimetric ( DTG) curves have shoulder peaks at about 300 °C; the third stage is the decomposi- tion of the residual big molecular organic substance and lignin at 400 °C—600 °C. Within the range of given experimental conditions, the results of non-linear fitting algorithm and experiment are in agreement with each other and the correlation coefficients are over 0.99. The kinetic characteristics are concerned with the material component and heating rate. The activation energy of reaction de- creases with the increase of heating rate.