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Cold Model Experiment of Gas-Liquid-Solid Three-Phase Fluidized Bed(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2014年04期
Page:
25-
Research Field:
Publishing date:

Info

Title:
Cold Model Experiment of Gas-Liquid-Solid Three-Phase Fluidized Bed
Author(s):
Zhang Jubing; Li Yaning; Qian Shulin; Yang Hongmin; Piao Guilin
School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210042,China
Keywords:
three-phase fluidized bed; pressure fluctuation signal; minimum fluidization velocity
PACS:
TQ021
DOI:
-
Abstract:
A gas-liquid-solid three-phase fluidized bed with inner diameter of 50 mm and height of 500 mm is established by using nitrogen as gas phase,distilled water as liquid phase and copper powder as solid phase.Pressure fluctuation signals obtained in the region upon the gas distributor are analyzed by Hilbert-Huang Transform method.The effects of gas flow rate on gas distributor pressure drop and differential pressure between two fixed measure points are studied.Minimum fluidization velocity of the three-phase fluidized bed is obtained from cold model experiments and further confirmed by high speed photography.The results show that solid particles strike each other violently with the gas flow rate of 14.85 mm/s.Gas phase,liquid phase and solid phase mixes well under such gas flow rate.With the increase in gas flow rate,differential pressure between two fixed measure points decreases at first,and then increases,and decreases at last.The minimum fluidization velocity of the three phase fluidized bed is determined as 17.4 mm/s and finally is verified by high synchronous image acquisition.

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Last Update: 2014-12-31