负压差对工业催化裂化装置立管输送催化剂性能的影响  

EFFECT OF NEGATIVE PRESSURE DIFFERENTIAL ON THE PERFORMANCE OF CATALYSTS TRANSPORT IN THE STANDPIPE OF INDUSTRIAL FLUID CATALYTIC CRACKING UNIT

作　　者：张磊[1,2] 赵北鲲[3] 刘君建 刘舜 黄新俊 申宝剑 段宏昌[3] 彭威[5] Zhang Lei;Zhao Beikun;Liu Junjian;Liu Shun;Huang Xinjun;Shen Baojian;Duan Hongchang;Peng Wei(China University of Petroleum,Beijing 102249;PetroChina Guangxi Petrochemical Company;PetroChina Lanzhou Petrochemical Company;PetroChina Yumen Oilfield Company;China University of Petroleum at Karamay)

机构地区：[1]中国石油大学(北京),北京102249 [2]中国石油广西石化公司 [3]中国石油兰州石化公司 [4]中国石油玉门油田分公司 [5]中国石油大学(北京)克拉玛依校区

出　　处：《石油炼制与化工》2025年第4期154-159,共6页Petroleum Processing and Petrochemicals

基　　金：中国石油兰州石化公司科技项目(LZSH202416);克拉玛依市人才专项(XQZX20240073)。

摘　　要：催化裂化(FCC)装置催化剂循环的下行部分是立管中的密相输送,催化剂流态复杂。受两器压力平衡影响,立管出口压力大于入口压力,为负压差操作。由于负压差是设计参数,工业现场技术人员对其调整范围较小,相关的设计和研究报道较少。在工业FCC装置上,测量了不同工况时负压差立管的轴向压力分布,然后采用CPFD软件研究了立管压差对立管轴向压力、颗粒浓度和循环量的影响。测量结果表明,负压差立管下部易出现填充流,造成立管轴向压力逆转。模拟结果表明:负压差阻碍立管排料,立管内颗粒藏量升高、蓄压增大;正压差立管颗粒脱气少,随正压差增大,立管轴向颗粒趋于均匀密相流,立管蓄压和催化剂循环量增大。研究结果可为立管设计和操作调整提供依据。The downflow section of the catalyst circulation in fluid catalytic cracking(FCC)units is characterized by dense phase transport within the standpipe,exhibiting complex flow behavior.The standpipe operates under a negative pressure differential due to the pressure balance between the reactor and the regenerator,with the outlet pressure being higher than the inlet pressure.This negative pressure differential is a design parameter,and due to its fixed nature,there is limited scope for adjustment by industrial field technicians,resulting in scarce reports on related design and research.This study measured the axial pressure distribution in the negative pressure differential standpipe under various operating conditions in an industrial FCC unit and employed CPFD software to investigate the effects of standpipe pressure differential on axial pressure,particle concentration,and catalyst circulation rate.The findings revealed that the lower section of the negative pressure differential standpipe was susceptible to plug flow,leading to a reversal of axial pressure.Simulations indicated that the negative pressure difference impeded catalyst discharge in standpipe,increased particle storage,and enhanced pressure buildup within the standpipe.Conversely,a positive pressure differential resulted in less particle degassing,and as the positive pressure differential increased,particles in the standpipe tended towards a more uniform dense phase flow,leading to an increase in standpipe pressure buildup and catalyst circulation rate.These research outcomes could inform the design and operational adjustments of standpipe.

关 键 词：立管 负压差 正压差 催化剂流态 质量流量 

分 类 号：TE6[石油与天然气工程—油气加工工程]