基于电容层析成像技术的流化床内固相体积分数分布特性研究
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摘要
针对煤清洁转化过程流化床内复杂气固两相流动特性,采用电容层析成像(简称ECT)技术,考察了流化床内玻璃珠和树脂颗粒瞬时和时均的固相体积分数分布特性。结果表明,利用不同时刻的瞬时固相体积分数等值图,可实现对截面颗粒分布的量化检测;局部时均固相体积分数沿径向呈"中心低、边壁高"的对称分布,截面时均固相体积分数沿轴向呈"下浓上稀"分布,测量结果与经典理论和实验观察相一致,表明ECT方法可以定性与定量测定流化床内气固两相流动过程固相体积分数。
In view of the complex gas-solid flow characteristics in the fluidized bed for coal clean conversion process,the solids volume fraction distribution of glass beads and resin was investigated by electrical capacitive tomography(ECT) in the fluidized bed.The results showed the instantaneous solids volume fraction isogram at different time could be used to quantitatively detect the particle distribution in the cross section.The local time-averaged solids volume fraction was symmetrically distributed along the radial direction,and the solids volume fraction was higher in the near wall region,whilst lower in the center of the bed.Also,the time-averaged solid volume fraction in the cross section was distributed along the axial direction,and the solids volume fraction was higher in the lower place,whilst lower in the upper place.The measured distribution was consistent with the classical theory and experimental observation,which indicated that the ECT method could quantitatively and qualitatively determine the solids volume fraction of gas-solid flow process in the fluidized bed.
In view of the complex gas-solid flow characteristics in the fluidized bed for coal clean conversion process,the solids volume fraction distribution of glass beads and resin was investigated by electrical capacitive tomography(ECT) in the fluidized bed.The results showed the instantaneous solids volume fraction isogram at different time could be used to quantitatively detect the particle distribution in the cross section.The local time-averaged solids volume fraction was symmetrically distributed along the radial direction,and the solids volume fraction was higher in the near wall region,whilst lower in the center of the bed.Also,the time-averaged solid volume fraction in the cross section was distributed along the axial direction,and the solids volume fraction was higher in the lower place,whilst lower in the upper place.The measured distribution was consistent with the classical theory and experimental observation,which indicated that the ECT method could quantitatively and qualitatively determine the solids volume fraction of gas-solid flow process in the fluidized bed.
引文
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[2]汪寿建.低阶煤清洁高效梯级利用关键技术及全产业链探讨[J].煤化工,2017,45(5):18-24.WANG S J.Discussion on Key Technologies of Clean and Efficient Cascade Utilization of Low Rank Coal and Its Whole Industrial Chain[J].Coal Chemical Industry,2017,45(5):18-24.
[3]苏万银.煤气化方法的比较及分析[J].煤化工,2010,38(3):10-14.SU W Y.Comparison and Analysis of Coal Gasification Methods[J].Coal Chemical Industry,2010,38(3):10-14.
[4]李红民,马玉真,邱力军,等.固相颗粒浓度射频导纳测量系统[J].宇航计测技术,2009,29(2):61-64.LI H M,MA Y Z,QIU L J,et al.The Measurement System of Solid Phase Particles Concentration by Radio Frequency Admittance[J].Journal of Astronautic Metrology and Measurement,2009,29(2):61-64.
[5]汪智国,魏飞.鼓泡床、湍动床固含率的相似分布规律[J].石油化工,1999,28(2):87-90.WANG Z G,Wei F.Similarity in Radial Profiles of Solids Fraction in Bubbling and Turbulent Fluidized Bed[J].Petrochemical Technology,1999,28(2):87-90.
[6]KANTZAS A,KALOGERAKIS N.Monitoring the Fluidization Characteristics of Polyolefin Resins Using X-ray Computer Assisted Tomography Scanning[J].Chemical Engineering Science,1996,51(10):1 979-1 985,1 987-1 990.
[7]MOSTOUFI N,CHAOUKI J.Local Solid Mixing in Gassolid Fluidized Beds[J].Powder Technology,2001,114(1-3):23-3l.
[8]周云龙,范振儒.流化床气固稀相流动体积空隙率的图像检测方法[J].化学反应工程与工艺,2009,25(5):431-436.ZHOU Y L,FAN Z R.Measurement Method of Volume Voidage in Dilute Gas Solid Flow of Fluidized Bed Based on Image Processing[J].Chemical Reaction Engineering and Technology,2009,25(5):431-436.
[9]PEI P,ZHANG K,YU B T,et al.Dynamic Characteristics of Binary Mixtures in a Two-jet Fluidized Bed[J].Chemical Engineering Science,2011,66(8):1 702-1 714.
[10]张娇龙,毛明旭,叶佳敏,等.流化床干燥过程压力和电容层析成像测量分析[J].工程热物理学报,2016,37(3):518-522.ZHANG J L,MAO M X,YE J M,et al.Investigation of Fluidized Bed Drying Process by Pressure and Electrical Capacitance Tomography[J].Journal of Engineering Thermophysics,2016,37(3):518-522.
[11]张洪洋,杨道业,史俊杰.挡板式内循环流化床内三维电容层析成像仿真[J].仪表技术与传感器,2017(4):112-116.ZHANG H Y,YANG D Y,SHI J J.Simulation of Three Dimensional Electrical Capacitance Tomography in Baffle Type Internal Circulating Fluidized Bed[J].Instrument Technique and Sensor,2017(4):112-116.
[12]HUANG S M,PLASKOWSKI A B,XIE C G,et al.Tomographic Imaging of Two-component Flow Using Ca pacitance Sensors[J].Journal of Physics E:Science Instruments,1989,22(3):173-177.
[13]XIE C G,HUANG S M,HOYLE B S,et al.Electrical Capacitance Tomography for Flow Imaging:System Model for Development of Image Reconstruction Algorithms and Design of Primary Sensors[J].Circuits,Devices and Systems,IEE Proceedings G,1992,139(1):89-98.
[14]FASCHING G E,SMITH N S.A Capacitive System for Three-dimensional Imaging of Fluidized Beds[J].Review of Science Instruments,1991,62(9):2 243-2 251.
[15]王海刚,刘石,姜凡,等.双层电容层析成像传感器及应用[J].仪表技术与传感器,2002(2):3-6.WANG H G,LIU S,JIANG F,et al.Dual-plane Electrical Capacitance System and Usage in Experience[J].Instrument Technique and Sensor,2002(2):3-6.
[16]罗琴,赵银峰,叶茂,等.电容层析成像在气固流化床测量中的应用[J].化工学报,2014,65(7):2 504-2 512.LUO Q,ZHAO Y F,YE M,et al.Application of Electrical Capacitance Tomography for Gas-solid Fluidized Bed Measurement[J].CIESC Journal,2014,65(7):2 504-2 512.
[17]DU B,WARSITO W,FAN L S.Behavior of the Densephase Transportation Regime in a Circulating Fluidized Bed[J].Industrial&Engineering Chemistry Research,2006,45(10):3 741-3 751.
[18]RAUTENBACH C,MELAAEN M C,HALVORSEN B M.Statistical Diagnosis of a Gas-solid Fluidized Bed Using Electrical Capacitance Tomography[J].In-ter national Journal of Multiphase Flow,2013,49:70-77.
[19]WANG H G,YANG W Q,DYAKOWSKI T,et al.Study of Bubbling and Slugging Fluidized Beds by Simulation and ECT[J].AIChE Journal,2006,52(9):3 078-3 087.
[20]GIDASPOW D.Multiphase Flow and Fluidization:Continuum and Kinetic Theory Descriptions[M].Boston:Academic Press,1994.
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