CAJ | 학술논문

在内径120 mm的半圆柱形内循环流化床中，以平均粒径387 nm的TiO2为原料，考察了单独通入流化气、射流气和同时通入流化气和射流气三种流化方式下超细粉的流化特性以及射流气速对超细粉聚团尺寸的影响。结果表明：同时通入流化气和射流气时，流化气能促进粉体循环，消除环隙死区；高速射流能有效破碎聚团，显著减小聚团尺寸，从而使超细粉在环隙区与导流管之间形成稳定循环，小聚团在环隙区实现平稳流态化。随着射流气速的增大，聚团尺寸减小，粒度分布变窄，在射流气速分别为60，90，120，150 m/s的条件下，聚团平均直径分别为194，158，147，135μm。
재내경120 mm적반원주형내순배류화상중，이평균립경387 nm적TiO2위원료，고찰료단독통입류화기、사류기화동시통입류화기화사류기삼충류화방식하초세분적류화특성이급사류기속대초세분취단척촌적영향。결과표명：동시통입류화기화사류기시，류화기능촉진분체순배，소제배극사구；고속사류능유효파쇄취단，현저감소취단척촌，종이사초세분재배극구여도류관지간형성은정순배，소취단재배극구실현평은류태화。수착사류기속적증대，취단척촌감소，립도분포변착，재사류기속분별위60，90，120，150 m/s적조건하，취단평균직경분별위194，158，147，135μm。
The fluidization characteristics of ultrafine powder TiO2 with an average diameter of 387 nm were investigated in a semi-cylindrical internal circulating fluidized-bed of 120 mm in diameter under three kinds of fluidization condition, introducing fluidizing gas individually, jet gas individually or both gases at the same time. The results indicated that fluidizing gas can promote the circulation of powder and eliminate dead zone in annulus; high-speed jet can effectively break the agglomerates and significantly reduce their size as the fluidizing gas and jet gas were introduced at the same time, so that the stable circulation of ultrafine powder between annulus and draft tube can be achieved and the small agglomerates can be fluidized steadily in annulus. Furthermore, the influence of jet gas velocity on the size of agglomerates was tested in this experiment as well. It was found that the size of the agglomerates becomes smaller and the size distribution becomes narrower with the increased jet gas velocity. The average diameters of the agglomerates were 194, 158, 147, and 135μm under the condition of the jet gas velocity were 60, 90, 120, and 150 m/s, respectively.