催化裂化反应系统关键装备技术研究进展
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摘要
通过详细分析催化裂化反应系统内不同区域的流动和反应特点,提出了"多区协控强化"的技术理念,形成了一种简单高效的催化裂化反应系统技术。该技术主要包括提升管进料段的"内置式气体内构件技术"和"油-剂逆流接触的新型进料段技术"、预提升区的"灵活调控剂/油比的混合预提升技术"、提升管出口油-剂快速分离区的"气-固旋流分离强化(SVQS)技术"以及汽提区的"组合环流汽提(MSCS)技术"。重点阐述了各项创新技术的研究进展,分析了创新技术与传统技术的差异,揭示了创新技术的优势所在。1.40 Mt/a重油催化裂化反应系统工业应用结果表明,该技术能够有效提高轻油收率,降低干气和焦炭产率,减少CO_2排量,提高企业经济效益。
On the basis of analyzing the fluidization and reaction characteristics in different regions of reaction system of RFCC unit,it is proposed that a new technical idea with the multi-zone cascade would control and intensify RFCC process.Furthermore,it is formed that a simple and efficient technology for the reaction system of RFCC unit.It includes a feed nozzle technology to control the secondary flow in riser,a downward pointed feed injection scheme in the feed injection zone,aprelifting scheme with two strands of catalyst inlets for FCC riser in the pre-lift zone,a SVQS vortex quick separator in the oil-catalyst quick separation region of riser outlet,and a MSCS high-efficiency stripper in the stripping zone.The advances of the new technology are described in detail.The differences between the innovative schemes and the traditional ones are compared by experiments and numerical simulations in order to reveal the internal mechanisms. The results from a commercial test show that this technology would provide a higher yield of light oil,lower yields of off-gas and coke,lower CO_2 emissions,and higher economic benefits of refinery.
On the basis of analyzing the fluidization and reaction characteristics in different regions of reaction system of RFCC unit,it is proposed that a new technical idea with the multi-zone cascade would control and intensify RFCC process.Furthermore,it is formed that a simple and efficient technology for the reaction system of RFCC unit.It includes a feed nozzle technology to control the secondary flow in riser,a downward pointed feed injection scheme in the feed injection zone,aprelifting scheme with two strands of catalyst inlets for FCC riser in the pre-lift zone,a SVQS vortex quick separator in the oil-catalyst quick separation region of riser outlet,and a MSCS high-efficiency stripper in the stripping zone.The advances of the new technology are described in detail.The differences between the innovative schemes and the traditional ones are compared by experiments and numerical simulations in order to reveal the internal mechanisms. The results from a commercial test show that this technology would provide a higher yield of light oil,lower yields of off-gas and coke,lower CO_2 emissions,and higher economic benefits of refinery.
引文
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[14]范怡平,叶盛,卢春喜,等.提升管反应器进料混合段内气固两相流动特性(Ⅰ)实验研究[J].化工学报,2002,53(10):1003-1008.(FAN Yiping,YE Sheng,LU Chunxi,et al.Gas-solid two phase flow in feed injection zone of FCC riser reactors(I)experimental research[J].CIESC Journal,2002,53(10):1003-1008.)
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[19]闫子涵,秦小刚,陈昇,等.油剂逆流接触提升管进料段固含率及颗粒速度的径向分布[J].过程工程学报,2014,14(5):721-729.(YAN Zihan,QIN Xiaogang,CHEN Sheng,et al.Radial distributions of solids holdup and particle velocity in FCC riser feed injection zone with catalyst-feed oil countercurrent contact[J].The Chinese Journal of Process Engineering,2014,14(5):721-729.)
[20]YAN Z,FAN Y,WANG Z,et al.Dispersion of feed spray in a new type of FCC feed injection scheme[J].AIChE Journal,2016,62(1):46-61.
[21]闫子涵,王钊,陈昇,等.新型催化裂化提升管进料段油、剂两相混合特性[J].化工学报,2016,67(8):3304-3312.(YAN Zihan,WANG Zhao,CHEN Sheng,et al.Matching between oil and catalyst in new scheme of FCC feed injection[J].CIESC Journal,2016,67(8):3304-3312.)
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[23]马达,霍拥军,王文婷.催化裂化反应提升管新型预提升段的工业应用[J].炼油设计,2000,30(6):24-26.(MA Da,HUO Yongjun,WANG Wenting.Commercial application of new lifting zone in FCC riser[J].Petroleum Refinery Engineering,2000,30(6):24-26.)
[24]刘清华,孙伟,钮根林,等.变径结构提升管反应器内颗粒流动特性的研究[J].炼油技术与工程,2007,37(10):32-36.(LIU Qinghua,SUN Wei,NIU Genlin,et al.Study on particle flow characteristics in new structure FCC riser[J].Petroleum Refinery Engineering,2007,37(10):32-36.)
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