Light scattering measurement method for multi-parameters of particle clusters in circulating fluidized bed

被引：0
|
作者：
Yang B. [1 ]
Zhang C. [1 ]
Ping L. [1 ]
Yin S. [2 ]
Jiang Y. [1 ]
机构：
[1] School of Energy and Power Engineering / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai
[2] School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing
来源：
Yang, Bin (yangbin@usst.edu.cn) | 1600年 / Science Press卷 / 42期
关键词：
Circulating fluidized bed; Cross-correlation method; Light scattering; Multi-phase flow measurement; Particle cluster;
D O I：
10.19650/j.cnki.cjsi.J2107880
中图分类号：
学科分类号：
摘要：
Aiming at the measurement issue of dynamic parameters and behavior characteristics of particle clusters in circulating fluidized bed (CFB), a multi-parameter simultaneous on-line measurement method of velocity, height and concentration of particle clusters based on light scattering principle is proposed. This method is used to measure the parameters of particle clusters in a two-dimensional cold test bench of CFB. The light attenuation signal caused by particle clusters flowing through the measurement zone is obtained. The velocity of particle clusters is obtained from the cross-correlation analysis of the light intensity signals of the upper and lower measurement units. The signal is filtered with low-pass filter, and the height of particle clusters is obtained according to the time difference of the extreme points of the low-frequency signal and the measurement results of motion velocity. At the same time, the concentration is calculated according to the light intensity attenuation. Thus, the multi-parameter on-line measurement of velocity, height and concentration of particle clusters in CFB is realized based on light scattering. The measurement results show that under typical working condition, the velocity of particle clusters in the central zone of riser is quite stable, and the average velocity is 3.81 m/s. The motion velocity of particle clusters in the near wall zone has large fluctuations, even is negative, and the average velocity is 0.65 m/s. The concentration of particle clusters in the central zone is less than that in the near wall zone. The height of particle clusters in the central zone is mainly distributed in the range of 20~40 mm, and the height of particle clusters in the near wall zone is mainly distributed in the range of 30~60 mm. The results provide an effective measurement method for studying the formation, structure and motion of particle clusters in CFB. © 2021, Science Press. All right reserved.
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页码：20 / 26
页数：6
相关论文
共 18 条
  • [1] JIN Y., Principles of fluidization engineering, (2001)
  • [2] CHEN H Z, YANG D G, CHENG J., Hydrodynamics of gas solids in a bubbling fluidized bed with binary Particles, Procedia Engineering, 102, pp. 799-803, (2015)
  • [3] WANG X F, JIN B SH, ZHONG W Q., Experimental study on gas-solid flow characteristic in high-flux circulating fluidized bed riser, Proceedings of the CSEE, 29, 17, pp. 27-31, (2009)
  • [4] GENG CH M, ZHONG W Q, SHAO Y J, Et al., 3D computational simulation of solid distribution characteristics in dual circulating fluidized bed, Journal of University of Chinese Academy of Sciences, 33, 2, pp. 258-264, (2016)
  • [5] CAHYADI A, ANANTHARAMAN A, YANG S, Et al., Review of cluster characteristics in circulating fluidized bed (CFB) risers, Chemical Engineering Science, 158, pp. 70-95, (2017)
  • [6] JIA W C, PARKER D M, COCCO R A, Et al., Cluster charac-teristics of continuous size distributions and binary mixtu-res of group B particles in dilute riser flow, Chemical Engineering Journal, 178, 24, pp. 348-358, (2011)
  • [7] WANG S, LU H, LIU G, Et al., Modeling of cluster structure-dependent drag with Eulerian approach for circulating fluidized beds, Powder Technology, 208, 1, pp. 98-110, (2011)
  • [8] WANG SH, LIU G D, ZHAO F X, Et al., Modeling of clusters characteristics in circulating fluidized beds, Journal of Chemical Industry and Engineering, 65, 6, pp. 2027-2033, (2014)
  • [9] LIU X H, GAO SH Q, LI J H., Characteristics of particle clusters in gas-solids circulating fluidized beds by using PDPA, Journal of Chemical Industry and Engineering, 55, 4, pp. 555-562, (2004)
  • [10] YANG J, ZHU J., A novel method based on image processing to visualize clusters in a rectangular circulating fluidized bed riser, Powder Technology, 254, pp. 407-415, (2014)
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