Particle and Aerosol Research
Vol. 12, No. 1, March 2016, Pages 21-26
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ISSN : 1738-8716 (Print)
ISSN : 2287-8130 (Online)
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Development of Light Transmission Fluctuation for Particle Measurement in Solid-Gas Two Phase Flows
YANG Bin*, WANG Zhan-ping, HE Yuan, and 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, Shanghai 200093, China
*Corresponding author.
Tel.: +86-021-55277764, E-mail: yangbin@usst.edu.cn
Received 04 August 2015, Revised 28 December 2015, Accepted 24 February 2016, Available online 31 March 2016
http://dx.doi.org/10.11629/jpaar.2016.12.1.021
Abstracts
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.
Keywords
gas-solid two-phase flow; In-line measurement; Light Transmission Fluctuation method; cross-correlation method; concentration influence
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