碳化硅超细粉球团变温热风干燥特性及其干燥模型

发布时间：2018-01-05 00:22

本文关键词：碳化硅超细粉球团变温热风干燥特性及其干燥模型　出处：《无机盐工业》2017年08期 　论文类型：期刊论文

【摘要】：利用先高温后低温的变温干燥工艺对碳化硅超细粉球团进行干燥,以变温干燥的前期温度、前期风速、后期风速、转换干基含水率及后期温度为主要影响因素,通过L16(45)正交实验研究变温干燥特性及其数学模型。研究表明:碳化硅超细粉球团在高温段的干燥特性与恒温干燥特性相同,进入低温段后随着球团由外向内的温度梯度降低,球团内部水分溢出阻力降低,导致内部水分扩散速率与表面气化速率相等,此时干燥速率进入短暂的恒速阶段;碳化硅球超细粉球团变温热风干燥工艺不仅可以降低干燥设备投资和干燥能耗,还具有出球温度低、显热少、冷却时间短的优点;通过实验数据拟合,发现Midilli模型拟合度最好,可以较好反映出碳化硅超细粉球团在变温干燥下的干燥特性。
[Abstract]:The first after high temperature drying technology on low temperature silicon carbide ultrafine powder pellet drying in the early temperature, variable temperature drying period late wind speed, wind speed, moisture content and post conversion temperature as the main factors, through the L16 (45) orthogonal experiment and variable temperature drying characteristics and mathematical model. The results show that: silicon carbide ultrafine powder pellet drying characteristics and temperature in the high temperature drying characteristics of the same to the low temperature section with the pellet by the temperature gradient outside in reduced pellet moisture overflow resistance decreased, resulting in the internal moisture diffusion rate and surface evaporation rate are equal, the drying rate in the constant stage short silicon carbide ball; ultrafine powder pellet temperature of hot air the drying process can not only reduce the drying equipment investment and energy consumption, but also has the ball low temperature, less heat, has the advantages of short cooling time; through experimental data fitting It is found that the Midilli model has the best fitting degree, which can better reflect the drying characteristics of the SiC ultrafine powder pellets under the variable temperature drying.

【作者单位】：中国矿业大学(北京)化学与环境工程学院;
【分类号】：TB383.3;TQ163.4
【正文快照】： 碳化硅作为重要的工业原料,广泛应用于钢铁冶炼、陶瓷烧制、耐火材料等领域中。中国不仅是碳化硅生产和消费大国,还是世界上主要的出口国[1]。在国外,硅铁粉和碳粉长期作为一种扩散脱氧材料,被用于钢铁冶炼中的电炉还原,但其成本较高。碳化硅作为复合脱氧剂,脱氧效果比硅铁脱

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