摘要
以长庆催化裂化重油(FCC)和催化裂解重油(DCC)两种重油及魏墙煤(WQ)为原料,通过重油热处理、加氢处理及油煤共液化,利用元素分析、红外光谱分析及热重分析等手段对产物结构组成进行了分析表征,考察了两种重油热稳定性及其对油煤共加氢液化性能的影响。结果表明:重油高温热稳定性较差,热处理后正己烷不溶物质量分数明显提高;FCC易于脱氢芳构化,DCC以极性组分缩合为主,催化加氢能够抑制FCC高温脱氢;以FeS+S为催化剂催化时,供氢溶剂四氢萘(THN)中WQ液化转化率显著高于非供氢溶剂甲苯中WQ液化转化率,440℃时THN溶剂中WQ转化率最高,达到71.2%;油煤共加氢液化时,FCC和DCC都可以不同程度促进WQ转化,两种溶剂中WQ共液化转化率最高分别达到80.3%(FCC,420℃)和83.5%(DCC,420℃),但是沥青烯(AS)和前沥青烯(PA)等重质产物收率高;重油热稳定性是影响油煤共液化及液化产物分布的重要因素,重油主要通过自身缩合以及与煤共液化产物作用形成重质产物;FCC/WQ共液化重质产物以AS为主,主要来自于FCC脱氢缩合;DCC/WQ共液化时DCC极性组分缩合形成以PA为主的重质产物;较低温度(低于420℃)下,FCC脱氢缩合程度低,与WQ共液化匹配性好;较高液化温度(不低于420℃)可抑制DCC极性组分缩合,DCC适合与WQ高温共液化。
Changqing catalytic cracking heavy oil(FCC),deep catalytic cracking heavy oil(DCC)and Weiqiang coal(WQ)are used as raw materials.Through heavy oil heat treatment,hydrotreating and oil coal co-liquefaction,the structure and composition of the products were characterized by ultimate analysis.Fourier and thermogravimetric analysis.The thermal stability of the two heavy oils and their effects on the co-hydroliquefaction performance of oil and coal were investigated.The results indicate that the thermal stability of two heavy oils was poor at high temperatures.The content of n-hexane insoluble substance in the treated heavy oil significantly increases.In the process of heat treatment,FCC mainly carries out dehydrogenation and aromatization,while DCC is dominated by the condensation of polar components.Dehydrogenation of FCC at high temperatures can be inhibited catalytic hydrogenation.With FeS+S as the catalyst,the conversion of WQ in hydrogen-donating THN solvent is significantly higher than that in non-hydrogen donating toluene solvent,and the maximum conversion of WQ reached 71.2%in THN at 440℃.In co-hydroliquefaction,both FCC and DCC promote the conversion of WQ to a certain extent.The maximum conversions of WQ in WQ/FCC and WQ/DCC co-hydroliquefactions reach up to 80.3%(WQ/FCC at 420℃)and 83.5%(WQ/DCC at 440℃),respectively.But the yields of heavy products such as asphaltene(AS)and preasphaltene(PA)are high for both FCC and DCC.The thermal stability of heavy oil is an important factor affecting the co-hydroliquefaction and product distribution.Specifically,the heavy products of FCC/WQ co-liquefaction mainly consist of AS,which partly comes from the dehydrogenation condensation of FCC,while DCC polar components easily condense to form PA as the dominant heavy products of DCC/WQ co-liquefaction.At lower temperatures(<420℃),FCC shows good compatibility with WQ co-liquefaction due to insignificant dehydrogenation condensation of FCC.High liquefaction temperatures(≥420℃)can inhibit the condensation of DCC polar components,so DCC is suitable for high-temperature co-liquefaction with WQ.
作者
王知彩
涂明远
潘春秀
孙磊
康士刚
李占库
颜井冲
任世彪
雷智平
水恒福
WANG Zhicai;TU Mingyuan;PAN Chunxiu;SUN Lei;KANG Shigang;LI Zhanku;YAN Jingchong;REN Shibiao;LEI Zhiping;SHUI Hengfu(Anhui Key Laboratory of Clean Coal Conversion and High-value Utilization,School of Chemistry and Chemical Engineering,Anhui University of Technology,243032 Ma’anshan,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2022年第6期62-71,共10页
Coal Conversion
基金
国家自然科学基金资助项目(21875001)
科技部国家重点研发计划项目(2018YFB0604602)
煤清洁转化与高值化利用安徽省重点实验室共同资助项目.
关键词
魏墙煤
重油
热稳定性
共加氢
液化性能
Weiqiang coal
heavy oil
thermal stability
co-hydrogenation
liquefaction performance
