链篦机—回转窑球团氧化脱硫动力学模型  

Dynamical Model of Pellet Oxidative Desulfurization for Grate-kiln

作　　者：张国成[1] 郑占斌[2] 张利[2] 

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]内蒙古包钢钢联股份有限公司炼铁厂,内蒙古包头014010

出　　处：《包钢科技》2016年第5期32-34,共3页Science & Technology of Baotou Steel

摘　　要：以链篦机—回转窑工艺生产中球团硫含量为基础,分析比较硫含量在各段的变化规律,依据单界面未反应核模型对球团氧化焙烧过程中的脱硫反应进行动力学分析,确定了脱硫反应的限制性环节并明确了脱硫反应机理,有助于在实际生产中控制脱硫反应的动力学条件,获得优质低硫球团矿。结果表明:球团氧化焙烧过程中脱硫反应的限制性环节是气体在多孔Fe2O3产物层内的扩散,其内扩散表观活能为39.673k J·mol-1,脱硫反应主要受动力学条件控制,提高焙烧温度、缩小球团粒度、增加球团气孔率均有利于硫的氧化脱除。This paper analyzes and compares the variation of sulfur content in each section based on the sulfur content in pellets in the production with grate - kiln way. And this paper makes the dynamic analysis for desulfurization reaction of pellets during oxidizing roasting which depends on uncreated -core model for single interface . In that way, we make sure the restrictive step of desulfurization reaction and identify the desulfurization reaction mechanism so as to control the dynamic condition of desulfurization reaction in actual production and achieve the high quality and low sulfur pellet. The result shows that the restrictive link of desulfurization reaction in pellet oxidizing roasting process is the gas diffusion in porous Fe2O3 products and the indiffusion apparent activation energy is 39. 673 kJ·mol^-1. Because of the reaction of desulfu- rization is mainly controlled by the dynamic condition, it will facilitate the oxidation of sulfur by way of raising roasting temperature and reducing the particle size as well as increasing the porosity of pellet.

关 键 词：未反应核模型 脱硫反应 限制性环节 

分 类 号：TK046.6[动力工程及工程热物理]