第38卷第6期2017年12月
能源化工Energy Chemical Industry Vol.38No.6Dec.2017 煤化工技术催化剂对不同粒径褐煤热解特性
及其煤焦微晶结构的影响
霍 威,钟思青
(中国石油化工股份有限公司上海石油化工研究院,上海201208)
摘要:以内蒙褐煤为研究对象,在固定床反应器上考察了催化剂对不同粒径褐煤热解过程中的各气体组分含量以及产气率的影响,通过XRD 研究了热解后煤焦的微晶结构特性三研究结果表明:无论
是原煤还是负载催化剂的褐煤,随着粒径增大,其热解产气率下降;对于各气体组分,CO,H 2,CH 4含量
均随原煤颗粒粒径增大而下降,CO 2却呈相反趋势三而在粒径相同的情况下,负载催化剂的试样热解产
气率稍大于原煤试样,且随着催化剂含量的增大,产气率提高,试样热解产生的CO 2和CH 4含量呈增加
趋势,但H 2,CO 含量却有所下降三对于粒径较大的试样,由于挥发分脱除不够完全,生成的煤焦碳化程度较低,使得煤焦石墨化程度也较低三此外,当粒径相同的情况下,负载催化剂的煤焦碳微晶结构越无
序,则随着催化剂负载量的增加,越阻碍试样石墨化的进程三
关键词:催化剂 粒径 煤热解 微晶结构 中图分类号:TQ546 文献标识码:A 文章编号:2095-9834(2017)06-0001-06
Influence of catalyst on pyrolysis characteristics and char crystalline structures of lignite with different particle size
HUO Wei ,ZHONG Siqing
(SINOPEC Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,China)
Abstract :The effects of catalyst on gas yields and gaseous compound contents of Inner Mongolia lignite with different particle si-zes are investigated by pyrolysis tests performed in a fixed -bed reactor.The crystalline structures characteristics of chars are deter-mined by methods of XRD.The results show that the pyrolysis gas yield of lignite,which is either raw coal or supported catalyst,de-creases as the particle size increases.For gaseous compound contents,the content of CO 2increases with the increase of particle size,but contents of CO,H 2,CH 4show opposite trends.In case of the same particle size,pyrolysis gas yields of lignite with catalyst is slightly larger than those of the raw coal samples,and with the increase of catalyst loading,contents of CO 2and CH 4produced by pyrol-ysis increase,but contents of H 2and CO decrease.The degree of graphitization of the char with relatively large particle size is relatively low,due to the incomplete devolatilization of the char.In addition,when the particle size is the same,the crystallite structure of the char with catalyst is disordered,and the process of graphitization becomes more and more hindered with the increase of the catalyst loading. Key words :catalyst;particle size;coal pyrolysis;crystalline structure
收稿日期:2017-10-20三作者简介:霍威(1988-),男,上海人,博士,工程师,现从事
煤气化方向的研究三E-mail:howell26@https://www.doczj.com/doc/9613857412.html,三 煤炭气化技术是高效清洁的煤炭利用技术之
一,其应用前景广阔,并受到国家的高度重视[1]三煤炭气化过程主要由原煤的热解及煤焦的气化2个
步骤组成三原煤热解过程可产生高质量的热解气,而且热解后生成煤焦的结构特性等会对后续的煤焦
气化存在显著的影响三目前,煤炭热解技术逐渐向大型化二低温化发展[2]三在热解过程中添加催化剂,可以降低热解温度,提高热解转化率,加快热解万方数据