Analysis of Voidage Fluctuations in Gas-Solid Bubbling Fluidized Bed Based on Kolmogorov Entropy

doi:10.12096/j.2096-4528.pgt.20041

Abstract

Abstract:

The gas-solid flow state determines the gas-solid mixing, heat and mass transfer characteristics in the fluidized bed, and plays an important role in the design, operation and monitoring of the fluidized bed device. In a self-built cold gas-solid bubbling fluidized bed, voidage fluctuation signals were measured using the particle concentration measuring instrument at the center of the fluidized bed under different working conditions, and were analyzed by chaotic theory using Kolmogorov entropy. The influences of apparent gas velocity, static bed height and bed size were studied. It shows the apparent gas velocity has the largest influence on Kolmogorov entropy, followed by the static bed height, and the smallest is bed size.

Key words: gas-solid bubbling fluidized bed, voidage, time-series analysis, chaotic analysis, Kolmogorov entropy

CLC Number:

TK16

Feng HAN, Kunlin CONG, Jie XIANG, Qinghai LI, Yanguo ZHANG, Jing MA. Analysis of Voidage Fluctuations in Gas-Solid Bubbling Fluidized Bed Based on Kolmogorov Entropy[J]. Power Generation Technology, 2021, 42(3): 322-328.

Figures/Tables 6

Fig.1 Schematic diagram of experiment system

Fig.2 Schematic diagram of particle concentration meter and its probe end

Fig.3 Particle size distribution of glass beads

Fig.4 The change of Kml entropy with gas velocity at different heights

Fig.5 The effect of static bed height on Kml entropy

Fig.6 The effect of bed size on Kml entropy

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