停留时间对低阶煤快速热解产物分布、组成及结构的影响  

Effect of residence time on distribution, composition and structure of products derived from fast coal pyrolysis

作　　者：张俊杰 徐绍平[1] 王光永 杨怀天 ZHANG Junjie;XU Shaoping;WANG Guangyong;YANG Huaitian(State Key Laboratory of Fine Chemicals, Chemical Engineering Institute, Dalian University of Technology, Dalian 116024, Liaoning, China;State Key Laboratory of Comprehensive Utilization of Industrial Exhaust Gas, National Center for C1 Chemical Engineering and Technology, Southwest Research & Design Institute of Chemical Industry, Chengdu 610225, Sichuan, China)

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室,辽宁大连116024 [2]西南化工研究设计院有限公司国家碳一化学工程技术研究中心工业排放气综合利用国家重点实验室,四川成都610225

出　　处：《化工进展》2019年第3期1346-1352,共7页Chemical Industry and Engineering Progress

摘　　要：利用自由落下床反应器,研究了快速热解过程中颗粒停留时间对神木烟煤和内蒙古褐煤热解过程的影响,并进一步延长快速热解新生半焦停留时间考察了半焦的二次热解过程。结果表明,快速热解过程中颗粒停留时间的增加促进了挥发分的析出,神木烟煤热解焦油产率持续增加,内蒙古褐煤热解焦油产率先增加后降低。停留时间对焦油品质有明显影响,随时间的增加,两种煤快速热解轻质油中苯类和苯酚类单环化合物含量均先增加后降低,进一步延长停留时间,多环芳烃化合物含量显著增加。快速热解半焦的二次热解主要促进了气体的生成,焦油产率和组成无明显变化,挥发分的进一步析出促进了半焦微孔的发展,神木烟煤和内蒙古褐煤半焦比表面积均显著增加。这表明,在以高品质焦油为目标产品时,采用较低的反应温度、较适宜的煤粒停留时间的快速热解工艺条件是可取的。The fast pyrolysis of Shenmu bituminous coal (SM) and Inner Mongolia lignite (NM) at different residence time in a free fall reactor is investigated. The secondary pyrolysis of the nascent char from the fast pyrolysis is also studied under a controlled temperature. The results show that with the increase of the residence time, the devolatilizations of both coals are enhanced. The tar yield from SM pyrolysis increases while that of NM pyrolysis increases firstly and then decreases. In addition, the residence time has significant influence on tar quality. With the increase of residence time, the benzenes and phenols in the light tars from both coals increase at first and then decrease, and longer residence time leads to obvious generation of polycondensed aromatics. The secondary pyrolysis of char produces more gaseous product, while the tar yield and its composition change little. Nevertheless, the micropores of char are developed. These results indicate that the fast pyrolysis of coal with suitable residence time of coal at moderate temperatures is advisable for producing high quality tar.

关 键 词：煤 快速热解 停留时间 半焦 焦油 

分 类 号：TQ536.1[化学工程—煤化学工程]