AlO粉末的振动流化与输送特性

Characteristics of Vibrating Fluidization and Transportation for AlO Powder.

作者信息

Ogata Koichiro, Harada Tsutomu, Kawahara Hideo, Tokumaru Kazuki, Abe Riho, Mitani Eiji, Mitani Koji

机构信息

Department of Mechanical Engineering, National Institute of Technology, Oita College, 1666 Maki, Oita 870-0152, Japan.

Shipping Department, National Institute of Technology, Oshima College, 1091-1 Komatsu, Suo-Oshima, Oshima 742-2193, Japan.

出版信息

Materials (Basel). 2022 Mar 16;15(6):2191. doi: 10.3390/ma15062191.

DOI:10.3390/ma15062191

PMID:35329644

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8949412/

Abstract

This study focused on the vibrating fluidized-bed-type powder feeder used in HVAF thermal spraying equipment. This feeder has been used in thermal spraying equipment and industrial applications. However, particulate materials' flow mechanism and stable transport characteristics have not been fully understood. This study experimentally investigated the fluidization characteristics, powder dispersion state, and powder transportation characteristics of AlO particles during vertical vibration fluidization. The material used was AlO particles of 2.9 μm and 3808 kg/m, classified as the group C particles in the Geldart diagram. As experimental conditions, the fluidized air velocity to the bottom of the powder bed and the vibration intensity in the vertical direction changed. The critical fluidization air velocity was defined to evaluate the generating powder flow by vertical vibrating fluidization. As a result, good fluidization of the powder bed of AlO was obtained by the vertical vibration, as well as an airflow that was higher than the critical fluidization air velocity. Regarding powder transportation characteristics, it was clarified that the fluidized air velocity at the bottom of the powder dispersion vessel and the pressure difference from the powder dispersion vessel to the transportation part significantly affect the mass flow rate.

摘要

本研究聚焦于用于高速火焰喷涂（HVAF）设备的振动流化床式送粉器。该送粉器已应用于热喷涂设备及工业应用中。然而，颗粒材料的流动机制和稳定输送特性尚未得到充分理解。本研究通过实验研究了AlO颗粒在垂直振动流化过程中的流化特性、粉末分散状态及粉末输送特性。所用材料为粒径2.9μm、密度3808 kg/m³的AlO颗粒，在 Geldart 图中属于 C 组颗粒。作为实验条件，改变了粉床底部的流化空气速度和垂直方向的振动强度。定义了临界流化空气速度以评估垂直振动流化产生粉末流的情况。结果表明，通过垂直振动，AlO粉床实现了良好的流化，且气流高于临界流化空气速度。关于粉末输送特性，明确了粉末分散容器底部的流化空气速度以及从粉末分散容器到输送部分的压力差对质量流率有显著影响。