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提出一种基于LED光源反射的液固搅拌槽中固体颗粒悬浮特性测定的光纤法.在直径0.38m、底部为椭圆形的搅拌槽中,用该法对水-二氧化硅两相体系固体颗粒悬浮特性进行了测定.结果表明,测量临界离底悬浮转速Njs的测量点应选择在搅拌槽下部区域,径向位置对Njs影响不大;在整个固含率范围内,光纤测量法与取样法测量结果较接近,平均相对误差为4.0%,目测法测定结果比取样法与光纤测量法稍高,光纤法比取样法更快速、简便,具有适用于不透明容器的优势,能快速测定最小均匀悬浮转速Nus,Nus随固含率增大而增大.
An optical fiber method based on the reflection of LED light source was proposed to measure the suspension characteristics of solid particles in a liquid-solid stirred tank. The water-silica solid phase particles were stirred in a stirred tank with a diameter of 0.38 m and an oval bottom. The results show that the measurement point of the critical off-center suspended rotational speed Njs should be selected in the lower part of the agitated tank and the radial position has little effect on the Njs. In the whole range of solid content, the optical fiber measurement method and sampling method The measurement results are close, with an average relative error of 4.0%. The visual determination results are slightly higher than the sampling method and the optical fiber measurement method. The optical fiber method is faster and easier than the sampling method, has the advantages of being suitable for the opaque container, Speed Nus, Nus increases with the solid content increases.