环流预汽提组合旋流快分系统粒级效率的三区计算模型
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摘要
在大型提升管冷模实验装置上,系统地考查了带有环流预汽提的旋流快分(CVQS)系统的气相流场和粒级效率。结果表明,随着旋流快分系统喷出口气速的增加,粒径小于7μm颗粒的粒级效率的变化较小,7~20μm颗粒的粒级效率逐渐变小,而超过20μm颗粒的粒级效率则逐渐增大。根据CVQS快分系统的气固分离原理和结构特点,建立了计算CVQS系统粒级效率的三区模型。计算结果表明,在颗粒粒径大于20μm时,模型预测的粒级效率与实验值吻合较好,其最大相对偏差不超过6.1%;在颗粒粒径小于20μm时,模型计算的粒级效率与实验值相差较大,其相对偏差在45.7%~80.3%之间变化,并且随着颗粒粒径的减小,其相对偏差逐渐增加。模型对于主要用于分离20μm以上颗粒的CVQS系统的工程设计,具有重要参考价值。
The gas flow field and the fractional efficiency of a novel combined system of circulation pre stripper & vortex quick separator(CVQS) were investigated via a large-scale cold model. The results showed that the separation efficiency of particles under 7 μm almost unchanged with increasing ejection gas speed, while getting smaller when the particle size was between 7 μm to 20 μm, and higher as the particle size is beyond 20 μm. On the basis of above investigations, the gas-solid separation mechanism of CVQS was talked over, and a triple region model used for analyzing the fractional efficiency of CVQS was proposed. The calculated results showed that this model was in good agreement with experimental data within the larger particle size distribution(beyond 20 μm) and the maximum relative deviation was under 6.1%. For the particle under 20 μm, there was an obvious difference between experimental and model values, whose relative deviation was within 45.7% and 80.5%, respectively. Therefore, the triple region model had important reference value in CVQS engineering design for separating particles beyond 20 μm.
The gas flow field and the fractional efficiency of a novel combined system of circulation pre stripper & vortex quick separator(CVQS) were investigated via a large-scale cold model. The results showed that the separation efficiency of particles under 7 μm almost unchanged with increasing ejection gas speed, while getting smaller when the particle size was between 7 μm to 20 μm, and higher as the particle size is beyond 20 μm. On the basis of above investigations, the gas-solid separation mechanism of CVQS was talked over, and a triple region model used for analyzing the fractional efficiency of CVQS was proposed. The calculated results showed that this model was in good agreement with experimental data within the larger particle size distribution(beyond 20 μm) and the maximum relative deviation was under 6.1%. For the particle under 20 μm, there was an obvious difference between experimental and model values, whose relative deviation was within 45.7% and 80.5%, respectively. Therefore, the triple region model had important reference value in CVQS engineering design for separating particles beyond 20 μm.
引文
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[18]卢春喜,李汝新,刘显成,等.催化裂化提升管出口超短快分的分离效率模型[J].高校化学工程学报,2008,22(1):65-70.DOI:10.3321/j.issn:1003-9015.2008.01.013.LU C X,LI R X,LIU X C,et al.Gas-solid separation model of a novel fcc riser terminator device:super short quick separator(SSQS)[J].Journal of Chemical Engineering of Chinese Universities,2008,22(1):65-70.DOI:10.3321/j.issn:1003-9015.2008.01.013.
[19]曹占友.催化裂化提升管末端新型气固分离装置的实验研究[D].北京:中国石油大学(北京),1995.CAO Z Y.Experimental study on a new type of gas solid separation device at the end of catalytic cracking riser[D].Beijing:China University of Petroleum(Beijing),1995.
[20]罗晓兰,陈建义,时铭显.旋风分离器粒级效率计算方法[J].石油化工设备,1999,(3):14-17.DOI:10.3969/j.issn.1000-7466.1999.03.004.LUO X L,CHEN J Y,SHI M X.The partical efficiency calculation of cyclone separators[J].Petrochemical Equipment,1999,(3):14-17.DOI:10.3969/j.issn.1000-7466.1999.03.004.
[2]KRAMBECK F J,SCHATZ K W.Closed reactor FCC system with provision for surge capacity:US4579716[P].1986-04-01.
[3]CETINKAYA I B.Disengage stripper:US5158669[P].1992-10-27.
[4]CETINKAYA I B.Method and apparatus for the fluid catalytic cracking process of hydrocarbon feed:CN 1035773C[P].1997-06-16.
[5]CETINKAYA I B.External integrated disengage stripper and its use in fluidized catalytic cracking process:US 5314611[P].1994-05-24.
[6]卢春喜,时铭显.国产新型催化裂化提升管出口快分系统[J].石化技术与应用,2007,25(2):142-146.DOI:10.3969/j.issn.1009-0045.2007.02.011.LU C X,SHI M X.Novel catalytic cracking riser termination devices in China[J].Petrochemical Technology&Application,2007,25(2):142-146.DOI:10.3969/j.issn.1009-0045.2007.02.011.
[7]卢春喜,时铭显,许克家.带有密相环流预汽提器提升管出口的气固快分方法及设备:CN1200945A[P].1998-12-09.LU C X,SHI M X,XU K J.Gas-solid quickly separating method and apparatus for lift-leg outlet having close-phase circulation prestripping device:CN1200945A[P].1998-12-09.
[8]曹占友,时铭显,孙国刚.提升管催化裂化反应系统气固快速分离和气体快速引出方法及装置:CN1160744A[P].1997-10-01.CAO Z Y,SHI M X,SUN G G.Fast gas-solid separation and gas lead-out method and equipment for hoisting-pipe catalytic-cracking reaction system:CN1160744A[P].1997-10-01.
[9]曹占友,时铭显,孙国刚,等.提升管反应系统旋流式气固快速分离和引出方法及装置:CN1165052A[P].1997-11-19.CAO Z Y,SHI M X,SUN G G,et al.Cyclone type gas-solid quick separating and extraction method and device for hoisting pipe reaction system:CN1165052A[P].1997-11-19.
[10]孙凤侠,周双珍,卢春喜,等.催化裂化沉降器多臂式旋流快分系统封闭罩内的流场[J].石油炼制与化工,2003,34(9):59-65.DOI:10.3969/j.issn.1005-2399.2003.09.014.SUN F X,ZHOU S Z,LU C X,et al.The gas flow field in multi-arm vortex separation system of FCC disengage[J].Petroleum Processing and Petrochemicals,2003,34(9):59-65.DOI:10.3969/j.issn.1005-2399.2003.09.014.
[11]孙凤侠,卢春喜,时铭显.催化裂化沉降器VQS系统内三维气体速度分布的改进[J].石油炼制与化工,2004,35(2):51-55.DOI:10.3969/j.issn.1005-2399.2004.02.013.SUN F X,LU C X,SHI M X.Modification of the 3-dimension gas flow field in the vortex quick separation system of FCC disengager[J].Petroleum Processing and Petrochemicals,2004,35(2):51-55.DOI:10.3969/j.issn.1005-2399.2004.02.013.
[12]孙凤侠,卢春喜,时铭显.催化裂化沉降器旋流快分系统内气相流场的数值模拟与分析[J].化工学报,2005,56(1):16-23.SUN F X,LU C X,SHI M X.Numerical simulation and analysis of gas flow field in vortex quick separation system of FCC disengager[J].Journal of Chemical Industry and Engineering(China),2005,56(1):16-23.
[13]孙凤侠,卢春喜,时铭显.旋流快分器内气相流场的实验与数值模拟研究[J].石油大学学报(自然科学版),2005,29(3):106-111.DOI:10.3321/j.issn:1000-5870.2005.03.024.SUN F X,LU C X,SHI M X.Experiment and numerical simulation of gas flow field in new vortex quick separation system[J].Journal of the University of Petroleum,2005,29(3):106-111.DOI:10.3321/j.issn:1000-5870.2005.03.024.
[14]孙凤侠,卢春喜,时铭显.催化裂化沉降器新型高效旋流快分器内气固两相流动[J].化工学报,2005,56(12):2280-2287.SUN F X,LU C X,SHI M X.Numerical simulation of gas-particles flow field in new vortex quick separation system for FCC disengager[J].Journal of Chemical Industry and Engineering(China),2005,56(12):2280-2287.
[15]刘梦溪,卢春喜.单段高料位气-固密相环流汽提器的密度分布[J].石油化工,2001,30(11):850-854.DOI:10.3321/j.issn:1000-8144.2001.11.009.LIU M X,LU C X.Study of a new kind of stripper[J].Petrochemical Technology,2001,30(11):850-854.
[16]许克家.催化裂化提升管出口快分系统的密相环流式预汽提器的研究[D].北京:中国石油大学(北京),1998.XU K J.Study on the pre stripping of the dense phase flow in the outlet of the catalytic cracking riser[D].Beijing:China University of Petroleum(Beijing),1998.
[17]张永民,卢春喜,时铭显.催化裂化新型环流汽提器的大型冷模试验[J].高校化学工程学报,2004,18(3):377-380.DOI:10.3321/j.issn:1003-9015.2004.03.021.ZHANG Y M,LU C X,SHI M X.Large-scale cold pilot experiment on a new annular catalyst stripper for FCC units[J].Journal of Chemical Engineering of Chinese Universities,2004,18(3):377-380.DOI:10.3321/j.issn:1003-9015.2004.03.021.
[18]卢春喜,李汝新,刘显成,等.催化裂化提升管出口超短快分的分离效率模型[J].高校化学工程学报,2008,22(1):65-70.DOI:10.3321/j.issn:1003-9015.2008.01.013.LU C X,LI R X,LIU X C,et al.Gas-solid separation model of a novel fcc riser terminator device:super short quick separator(SSQS)[J].Journal of Chemical Engineering of Chinese Universities,2008,22(1):65-70.DOI:10.3321/j.issn:1003-9015.2008.01.013.
[19]曹占友.催化裂化提升管末端新型气固分离装置的实验研究[D].北京:中国石油大学(北京),1995.CAO Z Y.Experimental study on a new type of gas solid separation device at the end of catalytic cracking riser[D].Beijing:China University of Petroleum(Beijing),1995.
[20]罗晓兰,陈建义,时铭显.旋风分离器粒级效率计算方法[J].石油化工设备,1999,(3):14-17.DOI:10.3969/j.issn.1000-7466.1999.03.004.LUO X L,CHEN J Y,SHI M X.The partical efficiency calculation of cyclone separators[J].Petrochemical Equipment,1999,(3):14-17.DOI:10.3969/j.issn.1000-7466.1999.03.004.