Dynamic characterizations of gas–solid flow in a novel multistage fluidized bed via nonlinear analyses

Wu, G.; He, Yan; Luo, Liang; Chen, Wei

doi:10.1016/j.cej.2018.11.083

Cited by 14 publications

(3 citation statements)

References 46 publications

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“…Wavelet analysis (Mallat, 1989) has a good feature of localization and multi-resolution in both time and frequency domains. It has been widely used for multi-resolution analysis of the pressure fluctuations in gas-solid fluidized beds (see, e.g., Lu and Li, 1999;Ellis et al, 2003;Zhao and Yang, 2003;Wu et al, 2007;Llop and Gascons, 2018;Wu et al, 2019). It has also been used in pneumatic conveying of bulk materials (Li, 2002;Cong et al, 2013).…”

Section: Typical Pressure Fluctuationsmentioning

confidence: 99%

Pressure fluctuation instability in vertical plug formation of coarse particles with a non-mechanical feeder

Diao

et al. 2019

Exp. Comput. Multiph. Flow

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Plug conveying receives attention due to its advantages such as low particle attrition, low pipeline wear, and low energy consumption. Based on the background of pneumatic transportation of absorber spheres in the small absorber sphere system of pebble bed HTGR, a novel non-mechanical feeder for plug formation of coarse particles has been proposed in our previous work. We further investigate the pressure fluctuation instability in the vertical plug formation of coarse particles with the non-mechanical feeder. Experiments for plug formation are conducted with glass beads of three kinds of particle diameter (dp = 6, 4, and 2 mm). The results show that micro-scale instabilities along with macro-scale instabilities are observed for the pressure fluctuations of feeder gas inlet in the vertical plug formation for the three particle diameters. It is interesting to find that the micro-scale instabilities decrease first and then increase with superficial gas velocity increasing for dp = 6 and 4 mm glass beads, respectively. The present study provides a further understanding of the pressure fluctuation instabilities in vertical plug formation of coarse particles with the non-mechanical feeder, which can contribute for on-line monitoring and operation optimization of dense-phase gas-solid flows with coarse particles. Keywords flow instability pressure fluctuations plug flow dense-phase pneumatic conveying granular materials high-temperature gas-cooled reactor

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Section: Typical Pressure Fluctuationsmentioning

confidence: 99%

Pressure fluctuation instability in vertical plug formation of coarse particles with a non-mechanical feeder

Diao

et al. 2019

Exp. Comput. Multiph. Flow

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“…Pressure fluctuations in fluidized beds contain a lot of information, such as the motion of particles, the formation and movement of bubbles, and particle-gas phase interactions. 12 The research mainly focuses 13,14 average value analysis 15 ), frequency domain analysis [power spectral density (PSD) analysis 14,16−19 ], time and frequency domain analysis [wavelet analysis (WA) 13,14,17,20,21 and Hilbert−Huang transform analysis 18,19 ], and chaos analysis (R/S method Hurst exponent analysis, 20,22 Shannon entropy analysis, 21 and Kolmogorov entropy analysis 20 ). A single perspective analysis method does not provide a comprehensive understanding of fluidized bed dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…The research mainly focuses on extracting fluid dynamics characteristics from pressure signals for the hydrodynamic status monitoring and flow pattern identification. There are several time series analysis techniques to analyze the pressure fluctuation signals, including time domain analysis (standard deviation analysis and , average value analysis), frequency domain analysis [power spectral density (PSD) analysis ,− ], time and frequency domain analysis [wavelet analysis (WA) ,,,, and Hilbert–Huang transform analysis , ], and chaos analysis ( R / S method Hurst exponent analysis, , Shannon entropy analysis, and Kolmogorov entropy analysis). A single perspective analysis method does not provide a comprehensive understanding of fluidized bed dynamics.…”

Section: Introductionmentioning

confidence: 99%

Fluidization Dynamics of a New Two-Staged Fuel Reactor for Chemical Looping Gasification

Guo

Yin

et al. 2022

Energy Fuels

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A new staged fuel reactor (FR), which integrates a bubbling bed and a spouted fluidized bed, is proposed in the present work with regard to lowering the pressure drop of the staged FR during chemical looping applications. In order to gain insights into the gas−solid fluid dynamics of the new design, a cold experimental setup was established. The fluidization dynamics of the staged FR was investigated based on the pressure pulsation signal analysis using time domain analysis, power spectral density analysis, wavelet analysis, and the Hurst exponent analysis by the R/S method. There are four flow types of funnel-like flow, spout-fluidization, spouting motion, and unsteady spouting motion to be classified, and the transition boundaries of the corresponding flow types were determined. The design provides a way to lower the overall pressure drop of FR and then reduces the fan energy consumption to hold the oxygen carrier particle circulation.

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Simulation on coal combustion and calcium carbonate decomposition in a 5500 t/d full scale cement calciner

Cui,

Yu,

Shi

et al. 2023

Applied Thermal Engineering

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Dynamic characterizations of gas–solid flow in a novel multistage fluidized bed via nonlinear analyses

Cited by 14 publications

References 46 publications

Pressure fluctuation instability in vertical plug formation of coarse particles with a non-mechanical feeder

Pressure fluctuation instability in vertical plug formation of coarse particles with a non-mechanical feeder

Fluidization Dynamics of a New Two-Staged Fuel Reactor for Chemical Looping Gasification

Simulation on coal combustion and calcium carbonate decomposition in a 5500 t/d full scale cement calciner

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