National Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,CAs Beijing ResearchInstitute of Coal Chemistry,Coal Science and Technology Research Institute Co..Ltd. State Key Laboratory of Coal Mining and Clean Utilization National Energy Technology and Equipment Laboratory of Coal Utilization and Emission Control

为提高低阶煤热解焦油品质,提出了上部煤分级热解和下部半焦气化耦合的多层流化床低阶煤热解新工艺,在实验室多层溢流管式流化床中研究了操作模式(流化床层数分别为单层、双层、三层)、过量氧气系数、水蒸气煤比(质量比)等因素对热解产物产率和焦油品质的影响。结果表明:氧气和水蒸气作为气化剂可促进多环芳烃的裂解;高温区产生的重质焦油在经过上部床层时与热态半焦接触,在半焦催化作用下发生催化重整反应可提高焦油品质;随着流化床层数从单层增加到三层,热解气体和焦油产率增加,半焦产率下降,焦油的组分明显减少,焦油中轻油的产率逐渐增加,而酚油和洗油产率下降;轻油与酚油质量分数之和在流化床层数为三层时达到了99.49%。因此,通过多层流化床热解低阶煤可以获得轻质组分含量较高的焦油。

in order to improve tar quality from pyrolysis of low rank coal.the new technicue of low rank coal pyrolysisin mulistage fuidized bed withcal staed pyrolysis in the upper stage and char gasification in the lower stage was proosed. The efifcts on products distrbution an tar qualty were investigated under the conditon of different operation mode( the numbers of fuidized bed stages was sing e,cdouble and three respecivly excesivecoxygen raio and steam and coal mass raio h2results showed that the oxygen and steam as gasifying agert could promofe cracking of polycyeic aromat c hydrocaoon.The heay tar specis formed in the high temperature region was contacted with hot char when they passed the upper bed which cou d be furthery cracked and reformed under thecataysis of char to improve th ar qualit : With increasing the number of stages fromn singie to three.the yield of pyrolysis gas and ta,and the content of lghtail increased,whereas the char yield,the amount of component oftarthecontent of phenol oi nd wash oil decreased. The content of both helghtail and phenol oil oftarobtained from the tree-stage fuidizedbed pyrolysis reached 99.49%.Therefore,the tar with high content of light al could obtained by staged pyrolysis of low rank cal in muitistag fuidized bed.

国家国际科技合作专项基金资助项目(2015DFA60320)；国家自然科学基金资助项目(21376250,21406105)；国家自然科学基金煤炭联合基金资助项目(U1361122)；国家高技术研究发展计划(863计划)资助项目(2015AA050505)；