煤热解耦合焦油裂解对焦油品质的影响  

Effect of coal pyrolysis coupled with its product tar cracking behavior on tar quality

作　　者：黄黎明[1,2] 马凤云[1,2] 刘月娥[1,2] 高超[1,2] 刘景梅[1,2] 钟梅[1,2] 

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046 [2]新疆大学煤炭清洁转化与化工过程自治区重点实验室,新疆乌鲁木齐830046

出　　处：《煤炭学报》2016年第6期1533-1539,共7页Journal of China Coal Society

基　　金：新疆维吾尔自治区高校科研计划重点资助项目(XJEDU2014I003);新疆大学博士启动基金资助项目(BS120111)

摘　　要：在2个串联的固定床反应器内,研究了和什托洛盖煤热解挥发物的二次裂解行为,考察二段固定床内温度及载体对焦油裂解性能的影响。结果表明:当二段管温度从400℃升至600℃时,焦油产率从13.3%降至12.5%,H2产率则由83.5 m L/g增加至111.8 m L/g;当温度低于500℃时,重质焦油产率无明显变化,但较单固定床明显降低,说明低温裂解可提高焦油品质;当温度≥550℃时,焦油裂解程度加剧,致使其重质组分产率较单固定床增加;当二段管温度为550℃时,与不添加催化剂相比,Ni/USY,Ni/HZSM-5(38)和Ni/HZSM-5(50)不同程度提高了焦油中轻质组分分率,其中Ni-USY的提质效果最明显,可使轻质焦油分率提高到71.9%,增幅达28.2%。Heshituoluogai coal was pyrolyzed in a fixed bed reactor at 600 ℃ and its pyrolysis tar was cracked in the second fixed bed reactor. The effect of tar cracking temperature and Ni-based catalysts with varying carriers on the performance of tar pyrolysis was investigated at N2 atmosphere. The results show that when the temperature in the second stage increases from 400 ℃ to 600 ℃,tar yield decreases from 13. 3% to 12. 5%,yield of Hydrogen increases from83. 5 mL / g to 111. 8 mL / g. There is no significant changes on yield of heavy tar as the cracking temperature is less than 500 ℃,but decreases obviously comparing with that in the first fixed bed reactor,it is suggested that low temperature cracking can improve tar quality. The degree of cracking increases when the cracking temperature is above550 ℃,and the corresponding yield of heavy tar increases compared with the first fixed bed. Adding Ni-based catalysts at 550 ℃ with different carriers of USY,HZSM-5（ 38） and HZSM-5（ 50） into the second tube,tar yields all decrease but the fraction of light tar increase compared with the value of non-catalyst. The highest fraction of light tar reaches71. 9% when Ni-USY is the catalyst,28. 2% higher than that of non-catalyst.

关 键 词：催化热解 耦合 焦油 固定床 

分 类 号：TQ530.2[化学工程—煤化学工程]