摘要
利用热重法研究了5种不同产地的煤矸石,在不同热解温度、样品粒度、升温速率时其热解过程及特性,得出了煤矸石的热解特征温度和热解特性参数.并对煤矸石的热解机理进行了分析,得到煤矸石的热解机理方程式和反应动力学参数.结果表明:热解温度、煤矸石种类、样品粒度和升温速率对煤矸石热解过程及特性有重要影响;煤矸石在热解初始阶段,热解反应服从三维球形扩散机制,并且其挥发分不易析出,活化能比较高,随着温度提高,挥发分大量析出,活化能有所降低;煤矸石热解第2阶段受液化反应控制,服从级数为3/2的化学反应,对于发生二次反应的煤矸石,在热解后期,二次挥发分析出需大量能量,活化能比较高.
Studied the pyrolysis process and performance of five kinds of coal residue from different regions under the conditions of different pyrolysis temperature, particle size and heating rate with thermogravimetric method, the characteristic temperature and performance parameter of coal residue pyrolysis were gotten. Also the pyrolysis mechanism of coal residue was analyzed, and the equations of pyrolysis mechanism and parameters of reaction kinetics were obtained. The results show that pyrolysis temperature, coal residue species, particle size and heating rate have an important effect on the pyrolysis process and performance of coal residue. The pyrolysis reaction is subjected to the mechanism of three-dimension global diffusion at the intial pyrolysis phase of coal residue, and the volatiles of coal residue don＇ t separate out easily, so the activation energy is bigger, the volatiles separate out largely with the increasing of temperature and the activation energy will be decreased. The second step of coal residue pyrolysis is subjected to the liquefaction reaction and the progression of chemical reaction is 3/2, the separation of secondary volatiles needs energy heavily at the end of pyrolysis, so the activation energy will be increased.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2006年第5期640-644,共5页
Journal of China Coal Society
基金
重庆市经委高新基金资助项目(05-1GX-QT194)
关键词
煤矸石
热解
热重分析
反应机理
coal residue
pyrolysis
thermogravimetric analysis
reaction mechanism
