Characterization of the flow in a gas-solid bubbling fluidized bed by pressure fluctuation. (31st December 2017)

• Record Type: Journal Article
• Authors: Xiang, Jie; Li, Qinghai; Tan, Zhongchao; Zhang, Yanguo
• Is Part Of: Chemical engineering science. Volume 174(2017)
• Page Start: 93
• Page End: 103
• Publication Date: 2017-12-31
• Subjects: Gas-solid fluidized bed -- Bubbling fluidization -- Flow behavior -- Pressure fluctuation -- Kolmogorov entropy -- Characteristic indicator; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2017.09.001
• Languages: English
• ISSNs: 0009-2509

Abstract

Highlights: Statistical, spectral and chaos analyses are used to analyze pressure fluctuations. The bubbling flow regime can be further divided into three sub-regimes. Amplitude of pressure, average pressure and Kolmogorov entropy can be used as indicators. Kolmogorov entropy decreases with static bed height and particle size. Abstract: Statistical, power spectral and chaos analysis methods were used to analyze pressure fluctuations in a bubbling fluidized bed. Effects of superficial gas velocity, static bed height, particle size and position of pressure probe on the flow behavior were investigated. It was shown that the flow behavior in terms of Kolmogorov entropy at the bottom of the bed was more complex than that at the upper part of the bed. Kolmogorov entropy decreased with increasing static bed height or particle size. In the range of 1.05 < U g / U mf < 4.37, Kolmogorov entropy had a strong linear relationship with the average cycle frequency. The amplitude of pressure fluctuations increased with the superficial gas velocity and the static bed height. The average pressure increased linearly with the static bed height. The dominant frequency of pressure fluctuations in the bed decreased with the static bed height, but barely changed with the gas velocity when it reached a certain value. The changes of superficial gas velocity, static bed height, and particle size can be determined by the changes of the amplitude of pressure fluctuations, the average pressure and Kolmogorov entropy.