气液固三相流化床层膨胀特性实验分析

发布时间：2018-04-30 05:10

本文选题：气液固三相流化床 + 床层膨胀　；参考：《化学工程》2017年06期

【摘要】：为分析气液固三相流化床床层特性,选用两种粒径接近、密度不同的颗粒:塑料颗粒(湿堆积密度1 273 kg/m~3,平均直径750μm)和陶粒(湿堆积密度1 680 kg/m~3,平均直径800μm),以常温空气为气相、水为液相。实验装置内径0.13 m,全床高度4.75 m,实验液柱高度3.5 m,床内颗粒有足够的膨胀高度。分别测试了液速0—13 mm/s,气速0—12 mm/s条件下的床层高度,研究气液速对塑料颗粒和陶粒床层膨胀率的影响。研究结果显示液速较低时床层收缩,随着气速增加,收缩率增大;液速较高时,膨胀率大于0,随着表观气速的增加,膨胀率先降低,表观气速大于临界值后,膨胀率将增大;除高气速外,床层膨胀率总是随着液速的升高而增大。相同气速、液速条件下,大密度陶粒的床层膨胀(收缩)率大于塑料颗粒。
[Abstract]:In order to analyze the characteristics of gas-liquid-solid three-phase fluidized bed, two kinds of particles with close diameter and different densities were selected: plastic particles (wet packing density 1 273 kg / m ~ (3), mean diameter 750 渭 m) and ceramsite (wet packing density 1 680 kg / m ~ (3), mean diameter 800 渭 m ~ (-1). Water is liquid. The inner diameter of the device is 0.13 m, the whole bed height is 4.75 m, and the liquid column height is 3.5 m. The particle in the bed has sufficient expansion height. The bed height under the conditions of liquid velocity of 0-13 mm / s and gas velocity of 0-12 mm/s was measured, and the effect of gas-liquid velocity on the expansion ratio of plastic particles and ceramsite bed was studied. The results show that the bed shrinks when the liquid velocity is low, and the shrinkage rate increases with the increase of the gas velocity, the expansion ratio is greater than 0 when the liquid velocity is higher, and the expansion rate will increase with the increase of the apparent gas velocity, and the expansion will decrease first with the increase of the apparent gas velocity, and the expansion rate will increase when the apparent gas velocity is larger than the critical value. In addition to high gas velocity, the bed expansion rate always increases with the increase of liquid velocity. At the same gas and liquid rates, the bed expansion (shrinkage) rate of large density ceramsite is larger than that of plastic particles.
【作者单位】：四川理工学院机械工程学院;过程装备与控制工程四川省(高校)重点实验室;西安大略大学化工与生物化工系;
【基金】：过程装备与控制工程四川省高校重点实验室(GK201301,GK201306) 人才引进项目(2016RCL04)
【分类号】：TQ051.13

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