Suppressing secondary reactions of coal pyrolysis by reducing pressure and mounting internals in fixed-bed reactor

作     者：Shuai Cheng Dengguo Lai Zhen Shi Leisheng Hong Jianling Zhang Xi Zeng Shiqiu Gao Guangwen Xu 

作者机构：State Key Laboratory of Multi-phase Complex Systemsinstitute of Process Engineering Chinese Academy of SciencesBeijing 100190China University of ChineseAcademy of SciencesBeijing 100049China AnHui University of TechnologyMa'anshan 243002China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2017年第25卷第4期

页      面：507-515页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081702[工学-化学工艺] 0817[工学-化学工程与技术] 08[工学] 0703[理学-化学] 

基　　金：Supported by the National Natural Science Foundation of China(21376250) National Basic Research Program of China(2014CB744303) the Strategic Priority Research Program of Chinese Academy of Sciences(XDA07010100) 

主　　题：Pyrolysis Fixed-bed Reaction Coal Reducing pressure Internals 

摘      要：Pyrolysis of Shenmu coal was performed in fixed-bed reactors indirectly heated by reducing operating pressure and mounting internals in the reactor to explore their synergetic effects on coal pyrolysis. Mounting internals particularly designed greatly improved the heat transfer inside coal bed and raised the yield of tar *** pressure further facilitated the production of tar through its suppression of secondary reactions occurring in the reactor. The absolute increase in tar yield reached 3.33 wt% in comparison with the pyrolysis in the reactor without internals under atmospheric pressure. The obtained tar yield in the reactor with internals under reduced pressure was even higher than the yield of Gray–King assay. Through experiments in a laboratory fixed bed reactor, it was also clarified that the effect of reducing pressure is related to volatile release rate in pyrolysis. It did not obviously vary tar yield at pyrolysis temperatures below 600 °C, while the effect was evident at 650 and 700 °C but became limited again above 800 °C. Under reduced pressure the produced tar contained more aliphatics and phenols but less aromatics.