煤直接液化残渣快速热解半焦特性的研究

在惰性气氛N2条件下,利用小型固定床进行了煤直接液化残渣快速热解半焦特性的研究，并结合热天平残渣半焦等温热失重进行分析。考察了终态温度、停留时间等外部操作条件以及颗粒大小对液化残渣快速热解半焦特性的影响。结果表明，半焦产率随着终态温度提高而降低，焦质变脆，石墨化程度增强，气化反应性减弱；随着反应停留时间的延长，热解产物半焦收率降低，但焦样中孔的数目增多；颗粒大小也影响着半焦的产率，在较大颗粒大小分布范围内，随着颗粒大小的减小，半焦产率随之减少。

Property of char from fast pyrolysis of direct coal liquefaction residue

Coal liquefaction residue was fast pyrolyzed in a fixed bed reactor and slow pyrolyzed in thermal blance under N2 atmosphere. The influence of final temperature, residence time and particle size on char property was examined. It is found that final temperature and reside time are the dominant factors on flash pyrolysis. With the final temperature increasing, the char yields decrease and the char becomes crisper and less reactive. Less char yields and more porous char are obtained as the residence time becomes longer. At the same time, char yield reduces as the residual particle size becomes smaller in a large size range.