带有环流预汽提的旋流快分系统动态压力的小波分析
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摘要
测量了环流预汽提与带隔流筒的旋流快分系统(SVQS)相耦合的大型冷模实验装置的动态压力特性.结果表明,旋流快分系统轴向压力脉动曲线具有很强的相似性,脉动强度随旋流头喷出口气速、颗粒质量流率增大而增大,压力脉动标准偏差与喷出气速、颗粒质量流率存在对应关系.由实验结果关联获得的脉动标准偏差与喷出气速、颗粒质量流率经验公式,可用于预测特定工况下工业装置的颗粒质量流率.通过小波分析,装置主频范围为1.5~12.5 Hz,周期约为7~10 s,旋流快分头上部空间的压力脉动较大,存在不稳定的漩涡区,发现周向脉动基本一致,径向在r/R=0.4~0.7时漩涡区的压力脉动强度较低.为了使装置能稳定运行,建议快分头的喷出气速为18~24 m/s,颗粒质量流率在超过90 kg/(m2?s)范围内.
An experiment was performed to measure the axial pressure fluctuation of the vortex quick separation system with annular pre-stripper. In order to give suggestions to the operation stability of actual industrial device through analyzing the pressure fluctuation characteristics and mechanism. As is shown in the experimental results, the axial pressure fluctuations have great similarity in the shape of the curves. The strength of the fluctuation increased with ejection gas velocity and the particulate mass flow rate increasing. Through the wavelet analysis, the frequency range of this device is approximately 1.5~12.5 Hz with a period of 7~10 s. It is found that there is an enormous pressure fluctuation above the quick separator and a vortex zone is found there. The circumferential pressure pulsations are basically the same, and the radial r/R=0.4~0.7 has a bigger vortex zone and the pressure fluctuation intensity is lower. As for industrial device operating stability, it is suggested that the injection gas velocity of the quick separation head is in the range of 18~24 m/s and the riser particle mass flow rate is more than 90 kg/(m2?s), the device can run stability.
An experiment was performed to measure the axial pressure fluctuation of the vortex quick separation system with annular pre-stripper. In order to give suggestions to the operation stability of actual industrial device through analyzing the pressure fluctuation characteristics and mechanism. As is shown in the experimental results, the axial pressure fluctuations have great similarity in the shape of the curves. The strength of the fluctuation increased with ejection gas velocity and the particulate mass flow rate increasing. Through the wavelet analysis, the frequency range of this device is approximately 1.5~12.5 Hz with a period of 7~10 s. It is found that there is an enormous pressure fluctuation above the quick separator and a vortex zone is found there. The circumferential pressure pulsations are basically the same, and the radial r/R=0.4~0.7 has a bigger vortex zone and the pressure fluctuation intensity is lower. As for industrial device operating stability, it is suggested that the injection gas velocity of the quick separation head is in the range of 18~24 m/s and the riser particle mass flow rate is more than 90 kg/(m2?s), the device can run stability.
引文
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[16]陈恒志,陈小翠,李洪钟.提升管内气固流动的小波分析[J].化学工程,2009,37(8):20-23.Chen H Z,Chen X C,Li H Z.Study on Gas-Solids Flow in Riser Based on Wavelets Analysis[J].Chemical Engineering(China),2009,37(8):20-23.
[17]王嘉骏,张文峰,冯连芳,等.气固搅拌流化床压力脉动的小波分析[J].化工学报,2006,57(12):2854-2859.Wang J J,Zhang W F,Feng L F,et al.Wavelets Analysis of Pressure Fluctuation in Agitated Fluidized Bed[J].Journal of Chemical Industry and Engineering(China),2006,57(12):2854-2859.
[18]周发戚,陈勇,魏志刚,等.循环流化床提升管T形弯头动态压力的小波分析[J].化工学报,2015,66(5):1697-1703.Zhou F Q,Chen Y,Wei Z G,et al.Wavelet Analysis of Dynamic Pressure in T-abrupt of CFB Riser[J].Journal of Chemical Industry and Engineering(China),2015,66(5):1697-1703.
[19]冯连芳,张文峰,王嘉骏,等.气固搅拌流化床内的压力脉动特性[J].浙江大学学报(工学版),2007,41(3):524-528.Feng L F,Zhang W F,Wang J J,et al.Pressure Fluctuation in Gas-Solid Agitated Fluidized Bed[J].Journal of Zhejiang University(Engineering Science),2007,41(3):524-528.
[20]孙凤侠.催化裂化沉降器旋流快分系统的流场分析与数值模拟[D].北京:中国石油大学(北京),2004:139-146.Sun F X.Numerical Simulation and Analysis of Gas Flow Field in the Vortex Quick Separation system of FCC disengage[D].Beijing:China University of Petroleum(Beijing),2004:139-146.
[2]Gauthier T,Bayle J,Leroy P.FCC:Fluidization Phenomena and Technologies[J].Oil and Gas Science and Technology,2000,55(2):187-207.
[3]Chen Y,Brostem D J.Standpipe Inlet Enhancing Particulate Solids Circulation for Petrochemical and Other Processes:US 6228328[P].1999-02-22[2001-05-08].
[4]卢春喜,徐桂明,卢水根,等.用于催化裂化的预汽提式提升管末端快分系统的研究及工业应用[J].石油炼制与工,2002,33(1):33-37.Lu C X,Xu G M,Lu S G,et al.Study and Industry Application of a Pre-stripping Separation System for Riser Termination of FCCU[J].Petroleum Processing and Petrochemicals,2002,33(1):33-37.
[5]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.Lu C X,Shi M X.Novel Catalytic Cracking Riser Termination Devices in China[J].Petrochemical Technology and Application,2007,25(2):142-146.
[6]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.Sun F X,Zhou S Z,Lu C X,et al.The Gas Flow Field in Multi-arm Vortex Quick Separation System of FCC Disengager[J].Petroleum Processing and Petrochemicals,2003,34(9):59-65.
[7]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.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.
[8]孙凤侠,卢春喜,时铭显,等.催化裂化沉降器新型高效旋流快分器的结构优化与分析[J].中国石油大学学报(自然科学版),2007,31(5):109-113.Sun F X,Lu C X,Shi M X,et al.Configuration Optimization and Analysis of Newly Developed Vortex Quick Separator for FCC Disengager[J].Journal of China University of Petroleum(Nature Science Edition),2007,31(5):109-113.
[9]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.Liu M X,Lu C X.Study of a New Kind of Stripper[J].Petrochemical Technology,2001,30(11):850-854.
[10]刘梦溪,谢建平,卢春喜,等.环隙气升式气固环流反应器内流体力学特性的理论分析[J].化工学报,2008,59(9):2198-2205.Liu M X,Xie J P,Lu C X,et al.Theoretical Analysis of Hydrodynamics in Novel Gas-Solids Annulus-sparged Airlift Loop Reactor[J].Journal of Chemical Industry and Engineering(China),2008,59(9):2198-2205.
[11]黄世平,鄂承林,王婷,等.环流预汽提组合旋流快分系统分离性能的实验研究[J].过程工程学报,2016,16(1):41-47.Huang S P,E C L,Wang T,et al.Experimental Study on Separation Performance of a Combined System of Circulation Pre-stripper and Vortex Quick Separator[J].The Chinese Journal of Process Engineering,2016,16(1):41-47.
[12]卢春喜,徐文清,魏耀东,等.新型紧凑式催化裂化沉降系统的实验研究[J].石油学报(石油加工),2007,23(6):6-12.Lu C X,Xu W Q,Wei Y D,et al.Experimental Studies of a Novel Compact FCC Disengager[J].ACTA Petrolei Sinica(Petroleum Processing Section),2007,23(6):6-12.
[13]胡小康,刘小成,徐俊,等.循环流化床提升管内压力脉动特性[J].化工学报,2010,61(4):825-831.Hu X K,Liu X C,Xu J,et al.Characteristics of Pressure Fluctuations in CFB Riser[J].Journal of Chemical Industry and Engineering(China),2010,61(4):825-831.
[14]高建强,姜华伟,陈鸿伟,等.鼓泡流化床风帽压力波动信号的小波包分析[J].动力工程学报,2010,30(10):763-766.Gao J Q,Jiang H W,Chen H W,et al.Wavelet Packet Analysis on Pressure Fluctuation Signal of Nozzle Button in Bubble Fluidized Bed[J].Journal of Chinese Society of Power Engineering,2010,30(10):763-766.
[15]赵贵兵,陈纪忠,阳永荣.Daubechies小波对流化床压力波动的分解研究[J].高校化学工程学报,2003,17(3):272-278.Zhao G B,Chen J Z,Yang Y R.Study on Decomposition of Pressure Fluctuations Using a Series of Daubechies Wavelets in a Fluidized Bed[J].Journal of China University of Petroleum,2003,17(3):272-278.
[16]陈恒志,陈小翠,李洪钟.提升管内气固流动的小波分析[J].化学工程,2009,37(8):20-23.Chen H Z,Chen X C,Li H Z.Study on Gas-Solids Flow in Riser Based on Wavelets Analysis[J].Chemical Engineering(China),2009,37(8):20-23.
[17]王嘉骏,张文峰,冯连芳,等.气固搅拌流化床压力脉动的小波分析[J].化工学报,2006,57(12):2854-2859.Wang J J,Zhang W F,Feng L F,et al.Wavelets Analysis of Pressure Fluctuation in Agitated Fluidized Bed[J].Journal of Chemical Industry and Engineering(China),2006,57(12):2854-2859.
[18]周发戚,陈勇,魏志刚,等.循环流化床提升管T形弯头动态压力的小波分析[J].化工学报,2015,66(5):1697-1703.Zhou F Q,Chen Y,Wei Z G,et al.Wavelet Analysis of Dynamic Pressure in T-abrupt of CFB Riser[J].Journal of Chemical Industry and Engineering(China),2015,66(5):1697-1703.
[19]冯连芳,张文峰,王嘉骏,等.气固搅拌流化床内的压力脉动特性[J].浙江大学学报(工学版),2007,41(3):524-528.Feng L F,Zhang W F,Wang J J,et al.Pressure Fluctuation in Gas-Solid Agitated Fluidized Bed[J].Journal of Zhejiang University(Engineering Science),2007,41(3):524-528.
[20]孙凤侠.催化裂化沉降器旋流快分系统的流场分析与数值模拟[D].北京:中国石油大学(北京),2004:139-146.Sun F X.Numerical Simulation and Analysis of Gas Flow Field in the Vortex Quick Separation system of FCC disengage[D].Beijing:China University of Petroleum(Beijing),2004:139-146.