摘要
为提高煤直接液化催化剂性能和氧化反应器运行的稳定性,通过分析影响催化剂性能及氧化反应器运行稳定性的因素,研究催化剂制备过程中的氧化反应温度、反应环境pH、氧化风量、反应器内物料流速、物料浓度等操作条件和氧化反应器塔盘结构优化调整措施。对不同操作条件下制备的催化剂在实验室进行高压釜煤直接液化评价,结果表明:α-FeOOH和γ-FeOOH晶相催化剂的形态为棒状或板条状结构,其比表面积越高煤液化活性越高,γ-FeOOH晶相催化剂较Fe_(3)O_(4)晶相催化剂对煤热解为沥青烯的催化效果最佳。通过调整氧化反应温度、反应环境pH、氧化风量等操作条件,制备出不同的催化剂,通过电镜扫描对比发现在工业装置上控制较低的氧化反应温度、较低的氧化反应环境pH及较高的氧化风量的操作工况下制备的催化剂晶型较好,催化剂可形成α-FeOOH或γ-FeOOH晶相,具有高分散度特性,催化剂性能最佳。针对目前工业化装置制备煤直接液化催化剂存在氧化反应温度高、在线pH计频繁失效、氧化反应器塔盘频繁堵塞等问题,提出了降低氧化反应温度、优化反应环境pH监控的方法以及后续改进措施。同时,通过提高氧化反应器内物料流速和减少塔盘数量减缓反应器塔盘堵塞,延长氧化反应器运行时间、提高运行稳定性。
In order to improve the performance of direct coal liquefaction catalyst and the operation stability of oxidation reactor,the influencing factors of catalyst performance and operation stability of oxidation reactor were analyzed.The operating conditions such as oxidation reaction temperature,pH of reaction environment,oxidation air volume,material flow rate and material concentration in the reactor,as well as the optimization and adjustment measures of oxidation reactor tray structure during the preparation of catalyst were studied.The catalysts prepared under different operating conditions were evaluated in the laboratory for direct liquefaction of autoclave coal.The results show that the morphology ofα-FeOOH andγ-FeOOH crystal catalysts is rod-like or slate-like structure,and the higher the specific surface area is,the higher the coal liquefaction activity is.γ-FeOOH crystal catalyst has the best catalytic effect on coal pyrolysis to asphaltene compared with Fe_(3)O_(4) crystal catalyst.Different catalysts is prepared by adjusting the operating conditions such asthe oxidation reaction temperature,reaction environment pH,oxidation air flow.Through comparison with electronmicroscope scanning,it is found that the catalyst prepared under operating conditions of lower reaction temperature,loweroxidation environment,pH and higher oxidation air volume on industrial devices has better crystal morphology.The product of the catalyst can formα-FeOOH orγ-FeOOH crystal phase,which has high dispersion characteristics and the best performance of the catalyst.Through analyzing the problems of high oxidation reaction temperature,frequent failure of online pH meter and frequent clogging of oxidation reactor tray in the preparation of direct coal liquefaction catalyst in industrial installations,the methods of reducing oxidation reaction temperature,optimizing pH monitoring of reaction environment and subsequent improvement measures were put forward.At the same time,by increasing the flow rate of materials and reducing the n
作者
王喜武
陈传富
谢晶
桂何正
WANG Xiwu;CHEN Chuanfu;XIE Jing;GUI Hezheng(Ordos Coal to Oil branch,China Shenhua Coal to Oil Chemical Co.,Ltd.,Ordos 017209,China;Shanghai Research Institute,China Shenhua Coal to Liquid and Chemical,Shanghai 201108,China;National Engineering Laboratory for Direct Coal Liquefaction,Shanghai 201108,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第8期41-46,共6页
Clean Coal Technology
基金
国家能源投资集团有限责任公司科技创新基金资助项目(SHJT-10-25)。
关键词
煤直接液化
催化剂
晶相
PH
氧化反应
direct coal liquefaction
the catalyst
crystalline phases
pH
oxidation reaction