Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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Development of Light Transmission Fluctuation for Particle Measurement in Solid-Gas Two Phase Flows

  • YANG, Bin (Institute of Particle and Two-phase Flow Measurement / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology) ;
  • WANG, Zhan-ping (Institute of Particle and Two-phase Flow Measurement / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology) ;
  • HE, Yuan (Institute of Particle and Two-phase Flow Measurement / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology) ;
  • CAI, Xiao-Shu (Institute of Particle and Two-phase Flow Measurement / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology)
  • Received : 2015.08.04
  • Accepted : 2016.02.24
  • Published : 2016.03.31
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Abstract

In order to realize In-line and convenient measurement for solid-gas two phase flows, Light Transmission Fluctuation (LTF) based on the random variation of transmitted light intensity, light scattering theory and cross-correlation method was presented for online measurement of particle size, concentration and velocity. The statistical relationship among transmitted light intensity, particle size and particle number in measurement zone was described by Beer-Lambert Law. Accordingly, the particle size and concentration were determined from the fluctuation signal of transmitted light intensity. Simultaneously, the particle velocity was calculated by cross-correlation analysis of two neighboring light beams. By considering the influence of concentration variation in industrial applications, the improved algorithm based on spectral analysis of transmitted light intensity was proposed to improve measurement accuracy and stability. Therefore, the online measurement system based on LTF was developed and applied to measure pulverized coal in power station and raw material in cement plant. The particle size, concentration and velocity of powder were monitored in real-time. It can provide important references for optimal control, energy saving and emission reduction of energy-intensive industries.

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References

  1. Cl Kleinstreuer, (2003). Two-Phase Flow: Theory and Applications, Taylor & Francis, New York.
  2. Allen, T., (1990). Particle Size Measurement, Chapman& Hall, New York.
  3. Ying Zheng, Qikai Zhang. (2004). Simultaneous measurement of gas and solid holdups in multiphase systems using ultrasonic technique, Chemical Engineering Science, 59(17), 3505-14. https://doi.org/10.1016/j.ces.2004.05.016
  4. Kaoru Miyazaki, Gang Chen, Fujio Yamamoto, Jun-ichi Ohta, Yuichi Murai, Kiyoshi Hori. (1999). PIV measurement of particle motion in spiral gas-solid two-phase flow, Experimental Thermal and Fluid Science, 19(4), 194-203. https://doi.org/10.1016/S0894-1777(99)00020-5
  5. Xinhua Liu, Shiqiu Gao, Jinghai Li. (2005). Characterizing particle clustering behavior by PDPA measurement for dilute gas-solid flow, Chemical Engineering Journal, 108(3), 193-202. https://doi.org/10.1016/j.cej.2005.01.012
  6. K.S Shifrin, A. N Sakharov. (1975). Determination of the average size and concentration of suspended particles from intensity fluctuations of transmitted light, Optics and Spectroscopy, 39(2), 208-210.
  7. Xiaoshu Cai, Junfeng Li, Xin Ouyang, Zhijun Zhao, Mingxu Su. (2005). In-line measurement of pneumatically conveyed particles by a light transmission fluctuation method, Flow Measurement and Instrumentation, 16(5), 315-320. https://doi.org/10.1016/j.flowmeasinst.2005.03.011
  8. Shouxuan Qin and Xiaoshu Cai. (2011). Indirect measurement of the intensity of incident light by the light transmission fluctuation method, Optics Letters, 36(20), 4068-70. https://doi.org/10.1364/OL.36.004068