Stable powder supply method and device based on internal and external cyclone fluidized powder

Abstract

The invention discloses a stable powder supply method and device based on internal and external cyclone fluidized powder, and belongs to the field of fluidized powder conveying. The device comprises a powder storage and supply section and a powder fluidization section. The powder storage and supply section comprises a piston and a storage tank. The powder fluidization section comprises an outer rotational flow fluidization gas inlet, a fluidization cavity, an inner rotational flow fluidization gas inlet, a spray head, a spray head installation block and a contraction outlet. The advantages of mechanical powder supply and pneumatic powder supply are combined, the piston at the tail end of the powder storage tank is driven through external force, the piston is used for pushing powder in the storage tank to accurately control the conveying amount of the powder, and continuous and stable supply of powder materials is guaranteed. In the fluidization cavity, the outer rotational flow shears the powder along the outer layer of the powder and scours the inner wall surface of the fluidization cavity, and the inner rotational flow nozzle generates self-rotation under the counter-acting force of tangential airflow, that is, the powder is fully fluidized by utilizing inner and outer double rotational flows, so that the bad fluidization phenomenon is prevented; and the powder is efficiently and stably conveyed to a target environment with higher pressure after being accelerated by the contraction outlet.

Description

technical field [0001] The invention belongs to the field of fluidized powder transportation, and in particular relates to a fluidized powder transportation method and device in the aerospace field, specifically a stable powder supply method based on internal and external cyclone fluidized powder for transporting ultrafine powder to a high-pressure environment with a large flow rate and device. Background technique [0002] Common powder conveying devices in the industrial field can be roughly divided into mechanical, pneumatic and compound types. Spiral type and scraper type belong to mechanical type, ejector type, Venturi tube type and fluidized bed type belong to pneumatic type, and compound type is usually a combination of spiral pneumatic type and blade pneumatic type. Mechanical powder supply focuses on powder material supply, which can meet the requirements of large conveying volume, but the structure is complicated, sealing is difficult, and it is not easy to transp...

AI Technical Summary

Problems solved by technology

[0004] The particle size of amorphous boron powder is about 1 to 5 microns. These particles are ultrafine particles or sticky particles. The force between particles is large, the powder has high viscosity, easy to agglomerate, and difficult to fluidize. Unfavorable fluidization phenomena such as knotting, channeling, and agglomeration make it difficult to provide long-term stable and uniform large-flow supply

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