Device and method for measuring size and movement speed of bubbles in concentrated phase gas-solid fluidized bed

Abstract

The invention relates to a device and a method for measuring the size and the movement speed of bubbles in a concentrated phase gas-solid fluidized bed, belonging to devices and methods for measuring movement behaviors of bubbles. The device comprises a gas-solid fluidized bed, a diffuser chamber, an airflow distributing plate, a high-speed dynamic camera, a data signal display and a data acquisition output and storage device. A high-density magnetite powder medium solid is stood in a gas-solid fluidized bed body, compressed air is diffused to generate uniform and stable bubble flows in the fluidized bed, the high-speed dynamic camera arranged on the front part of the fluidized bed is regulated to capture movement images of the bubbles penetrating through some bed plane, image information is immediately displayed on the data signal display and is continuously transmitted to the data acquisition output and storage device, and then effective data of the size and the movement speed of the bubbles can be obtained after accurate calculation. The device and method have the advantages of simple structure, convenience for operation, easy control, high measurement precision, good reliability, capability of realizing accurate measurement and accurate prediction of the single bubbles in a stable gas-solid multi-phase flow, and wide application range.

Description

technical field [0001] The invention relates to a device and method for measuring bubble size and moving speed, in particular to a measuring device and method for bubble size and moving speed in a dense-phase gas-solid fluidized bed. Background technique [0002] my country's coal resources are mainly distributed in arid and water-deficient areas such as Shanxi, Shaanxi, Inner Mongolia, and Xinjiang. It is very difficult to adopt wet coal preparation technology. Therefore, it is imminent to develop and promote high-efficiency dry coal preparation technology. The dense-phase high-density fluidized bed based on gas-solid multiphase flow has the advantages of wide application range, high separation efficiency, and low environmental pollution, and is gradually applied in the field of dry coal preparation. The fluidized bed mainly forms a quasi-dispersed bubbling fluidized bed with uniform and stable density at each point in the bed through sufficient contact and steady-state flo...

AI Technical Summary

Problems solved by technology

At present, there are few studies on the measurement of bubble size and velocity in dense-phase gas-tight multiphase flow, especially in dense-phase gas-solid fluidized bed.

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