晋城无烟煤加压快速热解特性及其对气化反应的影响

Pressurized fast pyrolysis of Jincheng anthracite and its effect on gasification reactivity

利用自行设计的加压热重固定床反应器进行了晋城无烟煤加压快速热解特性的研究,并结合热天平半焦等温热失重分析,考察了热解温度、停留时间和热解压力等外部操作条件对煤焦快速热解半焦特性的影响。结果表明,随热解温度的提高、停留时间的延长和热解压力的增大,所得到的半焦产率降低,气化反应性减弱,活化能提高;高温产生较小的比表面积,而停留时间的延长和压力的提高产生较大的比表面积,比表面积与气化反应速率无明显的依存关系。水蒸气气化速率是CO2的四倍左右。

The pressurized fast pyrolysis of Jincheng anthracite was studied in a thermogravimetric fixed-bed reactor.Combined with the thermogravimetric analysis of coal chars gasification by TGS-2,the influence of pyrolysis temperature,residence time and pyrolysis pressure on the characteristics of residual were investigated.The results show that the char yield,the gasification activity,as well as the activation energy are greatly affected by the pyrolysis temperature,residence time and pressure.The BET surface area of the char is high under the long residence time and high pressure,and is low at high temperature.There is not close relationship between the BET surface of the char and its gasification rate.The gasification rate in steam is about three times larger than that in CO2.