富氢气氛对煤热解特性的影响  

Experimental study on coal pyrolysis in hydrogen-rich atmosphere

作　　者：倪明江[1] 李敏[1] 方梦祥[1] 李超[1] 王勤辉[1] 骆仲泱 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《热力发电》2015年第6期36-41,共6页Thermal Power Generation

基　　金：国家高技术研究发展计划(863)项目(2013AA051203);国际合作项目(2011DFR60190);高等学校学科创新引智计划(B08026)

摘　　要：利用热天平对陕西延长烟煤进行Ar,CH4,H2及3种混合气(φ(CH4)∶φ(H2)分别为1∶1,2∶1,1∶2)气氛下的热解实验。结果表明:随着升温速率的增加,CH4气氛下延长煤失重增加,而H2气氛下失重减小;与惰性气氛相比,在H2和CH4气氛中,气氛气体会促进煤热解失重;在高温时,H2和CH4混合气氛中过多的H2不利于煤热解时挥发分的析出,但H2对CH4的炭化有抑制作用;通过EDS,SEM和化学法分析,富氢气氛比惰性气氛更利于S的脱除,形成的煤焦孔结构更显著;混合气氛中煤焦表面颗粒物相对于CH4气氛减少。The thermo-gravimetric analyzer was employed to investigate the effect of hydrogen-rich atmos-phere on pyrolysis behavior of Shaanxi Yanchang bituminous coal.The Ar,H 2 ,CH 4 and mixed gas （φ（CH 4 ）∶φ（H 2 ）=1∶1,2∶1,1∶2）were chosen as the atmospheres.The results show that,with an in-crease in heating rate,the weight loss of the coal increased in CH 4 atmosphere while decreased in H 2 atmos-phere.Compared with the inert atmosphere,the H 2 and CH 4 can promote the coal pyrolysis.At high tem-peratures,the excess H 2 was adverse to volatile escaping in the mixed gas atmospheres,while it restrained the CH 4 from carbonizing.The EDS,SEM and chemical method analysis results indicate that,compared with the inert atmosphere,in the hydrogen-rich atmosphere,the sulfur removal was more easy going and the coal char had more obvious pore structure.In the mixed gas atmospheres,the particles formed on coal char surface was less than that in CH 4 atmosphere.

关 键 词：煤热解 富氢气氛 热天平 升温速率 脱硫 

分 类 号：TQ530.2[化学工程—煤化学工程]