摘要
利用催化剂百吨级中试评价装置,对自主开发的费托合成CNFT-1浆态床铁基催化剂进行了工业运行条件下的2000 h长周期连续运转试验。催化剂百吨级中试评价装置内浆态床反应器总高28 m,直径DN200,配备有催化剂活化系统、费托合成反应系统、蒸汽包取热系统、催化剂在线置换系统、蜡过滤系统、产物分离系统、气体循环和尾气计量系统等。2000 h长周期连续运转试验期间CNFT-1催化剂活化温度为250~270℃,活化压力为2.5~3.0 MPa,恒温时间24 h;费托合成反应温度260~270℃,反应压力3.0 MPa,催化剂装填量15 kg。2000 h长周期性能评价结果表明CNFT-1催化剂在置换率为质量分数13%、置换周期为5~7 d的条件下,百吨级中试评价装置稳定运行,催化剂各项性能数据平稳。其中CO总转化率为95%~96%,CO2选择性<20%,CH4选择性为2.2%~2.4%;C^+3收率保持在170~180 g/m^3(标准状态),C^+3时空产率为0.94~1.05 kg/(kg·h)。当量置换周期为5 d时,每千克催化剂产C^+3数值保持在700 kg左右,置换周期增加为7 d时,每千克催化剂产C^+3量数值接近1000 kg。催化剂耐磨性好,重质蜡中铁含量低于25μg/g。长周期稳定运转试验产品中轻质油品主要组分集中于C6~C9,重质油主要组分集中于C13~C20,重质蜡主要组分集中于C25~C42,合成水中含氧化合物主要组分为正构醇。2000 h长周期连续运转试验结果表明在煤基浆态床费托合成工业装置工艺条件下,CNFT-1催化剂各项性能指标满足工业生产要求值,完全具备工业应用条件。
CNFT-1 catalyst,an independently developed iron based Fischer-Tropsch synthesis catalyst,was evaluated in a 100 t/a pilot unit for 2000 h long-term continuous test under commercial Fischer-Tropsch synthesis conditions.The type and height of the employed reactor are DN200 and 28 m.The 100 t/a pilot unit includes seven systems,which are catalyst activation system,Fischer-Tropsch synthesis reaction system,heat removal system,catalyst online replacement system,wax filtration system,product separation system,gas circulation and tail gas measuring system.CNFT-1 catalyst was activated under 250-270℃and 2.5-3.0 MPa for 24 h.The Fischer-Tropsch synthesis was conducted under 260-270℃and 3.0 MPa,with 15 kg loaded catalyst.The catalyst evaluation results showed that the CNFT-1 catalyst remained stable after 5-7 days catalyst replacement period and 13%replacement rate mass fraction each time.During the long-term performance evaluation,CO conversion,CO2 selectivity and CH4 selectivity were 95%-96%,<20%and 2.2%-2.4%,respectively.The yield of C^+3 maintained at 170-180 g/m^3 and the C^+3 space-time yield was 0.94-1.05 kg/(kg·h).The C^+3 yield per kilogram catalyst was increased from 700 to 1000 kg when the catalyst replacement period increased from 5 to 7 days.In addition,the CNFT-1 catalyst had excellent attrition resistance that iron content in heavy wax was lower than 25μg/g.The products of Fischer-Tropsch reaction in long-term operation included light oil,heavy oil and heavy wax,which were in the carbon number distribution of C6-C9,C13-C20 and C25-C42,respectively.The main component of oxygenated compounds in synthetic water was n-alcohols.Therefore,all the evaluation results had proved that under commercial conditions,the CNFT-1 catalyst meets the requirements of industrial production and is ready for industrial commercialization.
作者
杜冰
卜亿峰
孟祥堃
赵用明
谢晶
门卓武
DU Bing;BU Yifeng;MENG Xiangkun;ZHAO Yongming;XIE Jing;MEN Zhuowu(National Institute of Clean-and-Low-Carbon Energy,Beijing 102211,China;China Shenhua Coal to Liquid and Chemical Shanghai Research Institute,Shanghai 201108,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2020年第4期1290-1296,共7页
Journal of China Coal Society
基金
国家重点研发计划资助项目(2017YFB0602500)。
关键词
费托合成
中试
浆态床
铁基催化剂
长周期
Fischer-Tropsch synthesis
pilot plant
slurry bed
iron based catalyst
long period
performance study
