Study on The Kinetic Characteristics in Pyrolysis Process of Huadian Oil Shales by Isoconversional Method
Thermal analysis is increasingly used to obtain kinetic datum relating to samples decomposition. The popular model-fitting approach gives excellent fits for nonisothermal data but yields highly uncertain values of Arrhenius parameters. On the other hand, the model-free approach represented by the isoconversional method is recommended as a trustworthy way of obtaining reliable information from nonisothermal. So, in this research the thermal decomposition of Huadian oil shale samples was studied on the thermogravimetric analysis (TG, DTG) , at heating rates of 10,20,40,100℃/min under the nitrogen environment. The apparent activation energy in pyrolysis reactions of two kinds of oil shale samples has been analyzed by the isoconversional method of Friedman. The Sestak’s complex mechanism was used to fit liner for the pyrolysis reaction mechanism of oil shales, and the decomposition mechanism and frequency factor (A) were obtained. The results show that the activation energy is not a constant throughout the reaction process. But in the range of 0.1-0.9 for the conversion rate, the activation energy changes slightly. Oil shale pyrolytic mechanisms are complex and mainly attribute to the nuclear mechanism. The reason was discussed.
Oil shale Thermogravimetric analysis Kinetics Isoconversional method
Qing WANG Feng XU Baizhong SUN Jingru BAI Shaohua LI
Northeast Dianli University, Jilin, 132012, China Hebei Institute of Architecture Civil Engineeing, Hebei, 075024, China
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）