Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors

Yang, Yao and Zhang, Qing and Zi, Can and Huang, Zhengliang and Zhang, Wenbiao and Liao, Zuwei and Wang, Jingdai and Yang, Yongrong and Yan, Yong and Han, Guodong (2016) Monitoring of particle motions in gas-solid fluidized beds by electrostatic sensors. Powder Technology, 308 . pp. 461-471. ISSN 0032-5910. E-ISSN 1873-328X. (doi:https://doi.org/10.1016/j.powtec.2016.11.034) (Full text available)

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Abstract

Gas-solid fluidized beds are widely applied in numerous industrial processes. Particle motions significantly affect the performance of fluidized bed reactors and the characterization of particle movements is therefore important for fluidization quality monitoring and scale-up of reactors. Electrostatic charge signals in the fluidized bed contain much dynamic information on particle motions, which are poorly understood and explored. In this work, correlation velocities of Geldart B and D particles were measured, analyzed and compared by induced electrostatic sensors combined with cross-correlation method in the fluidized bed. The results indicated that the average correlation velocity of particle clouds increased and the normalized probability density distributions of correlation velocities broadened when the superficial gas velocity increased in the dense-phase region. Both upward and downward correlation velocities could be acquired in the dynamic bed level region. Under the same excess gas velocity, the average correlation velocity of Geldart D particles was significantly smaller than that of Geldart B particles, which was caused by the smaller bubble sizes caused by the dominant bubble split over coalescence and less volume of gas forming bubbles for Geldart D particles. The experimental results verified the reliability and repeatability of particle correlation velocity measurement by induced electrostatic sensors in the gas-solid fluidized bed, which provides definite potential in monitoring of particle motions.

Item Type: Article
Uncontrolled keywords: Induced electrostatic signal; gas-solid fluidized bed; cross-correlation method; correlation velocity
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Instrumentation, Control and Embedded Systems
Depositing User: Tina Thompson
Date Deposited: 09 Dec 2016 15:58 UTC
Last Modified: 02 Dec 2017 00:00 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/59585 (The current URI for this page, for reference purposes)
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