褐煤热解过程中半焦重整催化剂性质的变化  

Changes in char properties after catalytic reforming volatiles from pyrolysis of brown coal

作　　者：陈宗定[1,2] 王永刚[2] 许德平[2] 许修强[2] 

机构地区：[1]国家地质实验测试中心,北京100037 [2]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《燃料化学学报》2017年第8期908-915,共8页Journal of Fuel Chemistry and Technology

基　　金："十二五"国家科技支撑计划重点项目(2012BAA04B02)资助~~

摘　　要：为降低焦油产率,提高褐煤气化效率,采用胜利褐煤热解所得的半焦作为催化剂,在二阶石英反应器中对煤热解的焦油进行原位催化重整,分析和讨论了反应前后半焦催化剂的性质变化。结果表明,反应后半焦质量较反应前普遍有所下降,半焦是一种消耗性催化剂;反应后半焦的比表面积由422 m^2/g降到231.8 m^2/g;Raman分析结果表明,反应后半焦含氧官能团、小环(3-5个缩合芳环)与大环(大于5个缩合芳环)体系之比均有所降低。在半焦-挥发分作用过程中,快速热解制得半焦主要将挥发分裂解为小分子气体,慢速热解制得的半焦则主要使挥发分缩聚结焦脱除。To decrease tar yield and thus improving gasification efficiency,tar from pyrolysis of Shengli brown coal was catalytically reformed in situ in a two-stage quartz reactor using char（ as catalyst） prepared from the pyrolysis of same coal. The properties of char catalysts before and after reactions were analyzed and compared.The results showthat the mass of char generally decreases after the reforming reactions,which means that char is a kind of consumptive catalyst. The maximum reduction in specific surface area after reactions is from 422 to 231.8 m2/g. Results from Raman spectroscopy showthat the O-containing functional groups,as well as the ratio of small aromatic rings（ 3-5 aromatic rings） to big aromatic rings（ more than 5 aromatic rings） in char,decrease after the reactions. Besides,it appears that during the interaction between char and volatile,char from fastheating pyrolysis mainly cracks the volatiles into small-molecule gases,while char from slow-heating pyrolysis removes the volatiles by coking on its surface.

关 键 词：褐煤 热解 半焦 挥发分 催化重整 

分 类 号：TQ536[化学工程—煤化学工程]