逆流变径耦合催化裂化提升管进料段内固含率及颗粒速度的径向分布
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摘要
优化现有的油、剂逆流接触催化裂化提升管进料段结构,将进料喷嘴倾斜向下与内径变化相耦合。通过大型冷模实验装置,考察了在逆流变径耦合催化裂化提升管进料段不同轴向高度,固含率和颗粒速度的径向分布及操作条件对其产生的影响,并分别与前人所用的同径结构内的分布结果进行比较。结果表明,与对应的油、剂逆流接触催化裂化提升管进料段同径结构相比,变径结构进料段内,射流控制区域范围约缩短45.2%,且变径结构进料段内局部固含率分布更加均匀,有利于油、剂两相均匀混合。在实验操作范围内,提高预提升气速和适当提高进料喷嘴气速可使催化剂颗粒在径向分布更加均匀。
On the basic of previous feedstock injection zone of an FCC(fluid catalytic cracking)riser,where the feed jets contacted counter-currently with particle flow from riser bottom,some improvement was made by changing the size of diameter,thus the countercurrent-variable diameter structure was brought up.The radial distribution of solid holdup and particle velocity in different axial height was studied in a large-scale cold model experimental apparatus,along with the influence of experimental operating conditions on them,and the comparison of experimental results with previous no diameter-changing structure was made accordingly.The results showed that the range of jet control area in the countercurrent-variable diameter feedstock injection zone was shortened by45.2%,compared with the previous one.Besides,the distribution of local solid holdup was more uniform in the new structure,which was better in realizing a more uniform mixing of feed jet and particle.Furthermore,the distribution and mixing would become more perfect by properly increasing the pre-lift gas velocity and feed jet nozzle gas velocity among the experimental operation range.
On the basic of previous feedstock injection zone of an FCC(fluid catalytic cracking)riser,where the feed jets contacted counter-currently with particle flow from riser bottom,some improvement was made by changing the size of diameter,thus the countercurrent-variable diameter structure was brought up.The radial distribution of solid holdup and particle velocity in different axial height was studied in a large-scale cold model experimental apparatus,along with the influence of experimental operating conditions on them,and the comparison of experimental results with previous no diameter-changing structure was made accordingly.The results showed that the range of jet control area in the countercurrent-variable diameter feedstock injection zone was shortened by45.2%,compared with the previous one.Besides,the distribution of local solid holdup was more uniform in the new structure,which was better in realizing a more uniform mixing of feed jet and particle.Furthermore,the distribution and mixing would become more perfect by properly increasing the pre-lift gas velocity and feed jet nozzle gas velocity among the experimental operation range.
引文
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[8]陈昇,闫子涵,王维,等.提升管进料射流对气固两相流动混合的影响[J].过程工程学报,2016,16(4):556-564.(CHEN Sheng,YAN Zihan,WANG Wei,et al.Effect of feed sprays on gas-solid two-phase flow and mixing in a FCC riser[J].The Chinese Journal of Process Engineering,2016,16(4):556-564.)
[9]CHEN S,FAN Y,YAN Z,et al.CFD optimization of feedstock injection angle in a FCC riser[J].Chemical Engineering Science,2016,153:58-74.
[10]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):721-728.(YAN Zihan,QIN Xiaogang,CHEN Sheng,et al.Radial distribution of solids holdup and particle velocity in FCC riser feed injection zone of a nozzle riser in a large scale cold mold[J].The Chinese Journal of Process Engineering,2014,14(5):721-728.)
[11]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.)
[12]刘会娥,魏飞,金涌.气固循环流态化中常用的测试技术[J].化学反应工程与工艺,2001,17(2):165-173.(LIU Huie,WEI Fei,JIN Yong.Measuring techniques used in circulating fluidized bed research[J].Chemical Reaction Engineering and Technology,2001,17(2):165-173.)
[13]NIEUWLAND J J,MEIJER R,KUIPERS J A M.Measurements of solids concentration and axial solids velocity in gas solid two-phase flow[J].Powder Technol,1996,87(2):127-139.
[2]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]. Journal of Chemical Industry and Engineering(China),2002,53(10):1003-1008.)
[3]范怡平,蔡飞鹏,时铭显,等.催化裂化提升管进料段内气固两相混合流动特性及其改进[J].石油学报(石油加工),2004,20(5):13-19.(FAN Yiping,CAI Feipeng,SHI Minxian,et al.The gas-solid two-phase flow and the improvement in the feedstock of FCC riser[J].Acta Petrolei Sinica(Petroleum Processing Section,2004,20(5):13-19.)
[4]鄂承林,范怡平,卢春喜,等.提升管喷嘴进料段内油、剂两相接触状况研究[J].高校化学工程学报,2008,22(3):447-453.(E Chenglin,FAN Yiping,LU Chunxi,et al.Matching of the catalysts with feed jet gas in the feed injection section of FCC riser[J].Journal of Chemical Engineering of Chinese Universities,2008,22(3):447-453.)
[5]钟孝湘,侯拴弟,郑茂军,等.抗滑落提升管反应器流体力学性能的研究[J].石油炼制与化工,2000,31(07):45-50.(ZHONG Xiaoxiang, HOU Shuandi,ZHENG Maojun,et al.Study on the flow hydrodynamics of anti-down-slipping riser[J].Petroleum Processing and Petrochemicals,2000,31(07):45-50.)
[6]刘清华,孙伟,扭根林,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 structureFCCriser[J]. PetroleumRefinery Engineering,2007,37(10):32-36.)
[7]吴文龙,韩超一,李春义,等.变径提升管反应器扩径段内气固流动特性研究[J].石油炼制与化工,2014,45(11):54-59.(WU Wenlong, HAN Chaoyi,LI Chunyi,et al.Study on characteristics of gas-solids flow in diameter-enlarged section of a novel riser reactor[J].Petroleum Processing and Petrochemicals,2014,45(11):54-59.)
[8]陈昇,闫子涵,王维,等.提升管进料射流对气固两相流动混合的影响[J].过程工程学报,2016,16(4):556-564.(CHEN Sheng,YAN Zihan,WANG Wei,et al.Effect of feed sprays on gas-solid two-phase flow and mixing in a FCC riser[J].The Chinese Journal of Process Engineering,2016,16(4):556-564.)
[9]CHEN S,FAN Y,YAN Z,et al.CFD optimization of feedstock injection angle in a FCC riser[J].Chemical Engineering Science,2016,153:58-74.
[10]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):721-728.(YAN Zihan,QIN Xiaogang,CHEN Sheng,et al.Radial distribution of solids holdup and particle velocity in FCC riser feed injection zone of a nozzle riser in a large scale cold mold[J].The Chinese Journal of Process Engineering,2014,14(5):721-728.)
[11]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.)
[12]刘会娥,魏飞,金涌.气固循环流态化中常用的测试技术[J].化学反应工程与工艺,2001,17(2):165-173.(LIU Huie,WEI Fei,JIN Yong.Measuring techniques used in circulating fluidized bed research[J].Chemical Reaction Engineering and Technology,2001,17(2):165-173.)
[13]NIEUWLAND J J,MEIJER R,KUIPERS J A M.Measurements of solids concentration and axial solids velocity in gas solid two-phase flow[J].Powder Technol,1996,87(2):127-139.