摘要
利用热重技术研究了煤、塑料(高密度聚乙烯、低密度聚乙烯和聚丙烯)及其混合物的热解行为.结果表明,由于分子结构的相似性,3种塑料有相似的热解失重行为,由于灰分和固定炭含量高,煤的失重率最低.煤和塑料存在重叠的热解温度区(438～521℃),有利于塑料向煤供氢.煤/塑料共热解时在高温区存在协同效应(T>550℃).动力学分析表明,采用1至4个连续一级反应模型即可拟合实验数据,活化能和指前因子分别为35.7～572.8 kJ/mol和27×10^(38)～1.7×10^(38) min^(-1),其值取决于材料本身的特性.
Thermal pyrolysis behaviors of different plastics （high density polyethylene, low density polyethylene and polypropylene）, coal and their mixtures were investigated using thermogravimetric analysis. The results show that the three kinds of plastics have similar pyrolysis behaviors due to similar chemical bonds in their molecular structures. The weight loss of coal is lowest because of the high content of ash and fixed carbon. The overlapping degradation temperature （438-521℃） interval between coal and plastic is beneficial to hydrogen transfer from plastic to coal. There exists a significant synergistic effect between coal and plastic in the high temperature region （ T 〉 550 ℃ ） during co-pyrolysis. The kinetic analysis indicates that the global pyrolytic processes can be described as one to four consecutive first order reactions. A quite good fitting of experimental data was obtained for all the materials and mixtures studied. The activation energies and pre-exponential factors for all the materials were found to be within the range of 35.7-3-/2.8 kJ/mol and 27 ×10^38-1.7× 10^38 min^-1, respectively, depending on the properties of the materials.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第2期132-136,共5页
Journal of Combustion Science and Technology
基金
江西省自然科学基金(050002)
东华理工大学核资源与环境工程技术中心开放测试基金(070710)
关键词
煤
塑料
热解
动力学
coal
plastic
pyrolysis
kinetic
