摘要
选取安徽褐煤为原料煤,在不同温度下用催化裂化油浆对其进行溶胀处理,再将体系进行加氢共炼反应,以考察煤的溶胀对煤/油加氢共炼反应中干基无灰煤转化率的影响,并通过激光粒度仪、比表面和孔隙度仪、SEM、XRD、FT-IR等分析手段对比了溶胀前后褐煤及反应残渣的组成和结构变化。结果表明:油煤浆中的褐煤在200℃和300℃下均出现溶胀现象,伴随有轻微的转化,但在300℃下褐煤的溶胀现象更为明显,且300℃溶胀处理后进行加氢共炼反应,体系的干基无灰煤转化率由88.67%增至94.58%,反应残渣含量由4.12%降至2.73%。由表征分析可知,溶胀处理后褐煤的平均粒径、比表面积和孔体积增大,表面粗糙程度增加,孔隙结构增多。此外,溶胀处理后的反应残渣与未溶胀处理的反应残渣相比脂肪链变短,支链化程度降低,缩合程度降低,且300℃溶胀后残渣的芳香环取代度提高。证实溶胀处理增加了褐煤与活化氢的接触面积,增多了褐煤的加氢活性位点,有利于促进煤中有机质组分的转化并抑制稠环烃类的缩合,从而提高了转化率,降低了残渣含量。
In order to investigate the effect of coal swelling on dry base ash free coal conversion rate of coal/oil hydrogenation co-processing reaction,Anhui lignite was selected as raw material for swelling,FCC slurry was used to swell Anhui lignite at different temperatures,and the system was subjected to the reaction.The composition and structure changes of lignite and reaction residue before and after swelling were compared by means of laser particle size analyzer,specific surface area and porosity analyzer,SEM,XRD and FT-IR.Results show that the swelling phenomenon of lignite in coal/oil slurry occures both at 200℃and 300℃,accompanied by slight transformation,but the swelling is more obvious at 300℃.And after swelling treatment at 300℃,the conversion rate of dry base ash free coal increases from 88.67%to 94.58%,the content of reaction residue decreases from 4.12%to 2.73%.According to the characterization analysis,the average particle size,specific surface area and pore volume of lignite increases after swelling treatment,as well as the surface roughness and pore structure quantity.As for reaction residue,after swelling treatment,the content of CH 2/CH 3 becomes lower,the degree of condensation decreases,and after swelling at 300℃,the amount of substitution on aromatic ring increases.It is confirmed that swelling treatment increases the contact area between lignite and activated hydrogen,and the amount of hydrogenation active sites of lignite,then promotes the transformation of organic components and inhibites the condensation of polycyclic hydrocarbons.Thus the conversion rate is improved and the residue content is reduced.
作者
王兴兆
李传
邓文安
杨腾飞
任志祥
符欣怡
WANG Xingzhao;LI Chuan;DENG Wenan;YANG Tengfei;Ren Zhixiang;FU Xinyi(China State Key Laboratory of Heavy Oil Processing,China University of Petroleum,266580 Qingdao,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2019年第2期1-7,共7页
Coal Conversion
基金
国家自然科学基金青年基金项目(21106186)
山东省自然科学基金面上项目(ZR2017MB026)
关键词
煤/油加氢共炼
干基无灰煤转化率
反应残渣
溶胀作用
coal/oil hydrogenation co-processing
dry base ash free coal conversion rate
reaction residue
swelling effect
