煤直接液化循环溶剂加氢研究  

Hydrogenation of recycle solvent for direct coal liquefaction

作　　者：张伟 赵鹏 刘敏 李文博 ZHANG Wei;ZHAO Peng;LIU Min;LI Wenbo(Shendong Coal Group,CHN Enecgy,Ordos 017200,China;Beijing Research Institute of Coal Chemistry,CCTEG China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China;National Energy Technology&Equipment Laboratory of Coal Utilization and Emission Control,Beijing 100013,China)

机构地区：[1]国家能源集团神东煤炭集团公司,内蒙古鄂尔多斯017200 [2]煤炭科学技术研究院有限公司煤化工分院,北京100013 [3]煤炭资源高效开采和洁净利用国家重点实验室,北京100013 [4]国家能源煤炭高效利用与节能减排技术装备重点实验室,北京100013

出　　处：《洁净煤技术》2021年第6期121-127,共7页Clean Coal Technology

基　　金：国家重点研发计划资助项目(2016YFB0600303)。

摘　　要：为研究煤直接液化循环溶剂加氢反应规律并进行过程优化,以0.1 t/d连续装置获得的液化重油为原料,利用100 mL/h固定床连续装置进行了加氢试验,探讨了溶剂加氢体系的产物分布特征,考察了不同工艺参数对循环溶剂性质与结构组成的影响规律,利用500 mL高压釜进行了不同加氢深度的循环溶剂与淖毛湖煤液化性能验证。结果表明,在360~380℃,制备循环溶剂的加氢体系C_(1)~C_(3)气体产率不足0.2%,油产率接近100%,主要发生氧氮硫杂原子的部分脱除和芳烃的部分饱和反应,具有浅度裂化的反应特性,加氢产物保持了大比重和高芳烃的结构特征。在合适的温度范围内适度降低空速,可使更多的氢气进入溶剂内部,改变溶剂中芳烃-环烷烃-链烷烃的分子结构分布,特别是单双环芳烃的比例,有利于提升循环溶剂的供氢性能。在380℃,15 MPa和空速1 h^(-1)条件下生成的循环溶剂中烷基苯、环烷基苯、二环烷基苯以及双环芳烃数量最多,供氢指数最大,与淖毛湖煤在400℃,17 MPa,60 min缓和的条件下加氢液化的转化率可达93%,油产率59%,呈现出良好的转化特性和反应效果,实现油产率最大限度的提升。For further understanding and process optimization of selected hydrogenation of recycle solvent,heavy oil from 0.1 t/d Bench Scale Unit(BSU)were chosen to carry out the study on selected hydrogenation in 100 mL/h fixed bed reactor.The effect of different parameters on products distribution,recycle solvent properties and structures were reviewed.The Naomaohu coal liquefaction experiments with the hydrogenated solvent were carried out in 500 mL autoclave.The results showed that partial elimination of O,N,S and partial saturation of aromatics occurred with less than 0.2%gas yield and approximate 100%oil yield in hydrogenation system ranging from 360 to 380℃.Lower gas hourly space velocity in the conditions of proper temperature,more H_(2) enters solvent to change the distribution of aromatics-naphthene-alkane especially the proportion of monocyclic and bicyclic aromatics beneficial to improve H_(2) donation properties.The largest amount of alkyl benzene,naphthenic benzene,bicyclic alkylbenzene and highest H_(2) donation index in recycle solvent under the conditions of 380℃,15 MPa and 1 h^(-1) is beneficial for Naomaohu coal liquefaction to oil.93%conversion rate and 59%oil yield can be realized under the mild conditions of 400℃,17 MPa,60 min.

关 键 词：煤炭直接液化 循环溶剂 供氢性能 选择性加氢 芳烃饱和 脱杂 油产率 

分 类 号：TQ53[化学工程—煤化学工程]