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Calcination of Fine Limestone Particles by a New Type of Fluidized Bed Developed for a Fine Particle Treatment

通过为细颗粒处理而开发的新型流化床对细石灰石颗粒进行煅烧

基本信息

批准号：
08455361
负责人：
KATO Kunio
金额：
$ 3.97万
依托单位：
GUNMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455361/
关键词：
Limestone Fluidized Bed Fine Particles Powder-Particle Fluidzed Bed Slaked Lime Low Temperature Calcination High Reactivity Desulfurization solvent 微粒子生石灰脱塩酸剤多孔質生石灰石灰石のか焼

项目摘要

Calcination of fine limestone particles with 1-30 mum in diam.was carried out continuously by feeding the fine particles into the fluidized bed of medium particles with 500-1500 mum in diam.in the temperature range between 800-1000 C.Calcined limestone particles which were entrained from the bed were collected with a cyclone and a bag filter. Effects of bed temperature, particle size of the limestone, mean residence time of the gas in the bed, the major factors for the calcination conversion in this calcination system, on the calcination conversion were examined in the experiment. And the calcined particles were also studied from the view points of specific surface area and pore size distribution.From the experiments, relationships between each factor and calcination conversion were clarified. The suitable temperature range for the calcination was between 850 and 950 Cin this system, and as large as 97% conversion wes obtained at a certain condition. It was analytically found that this process provide a high calcination conversion with lower temperature and much shorter residence time of the particle compared to that of a conventional process. The calcined particles by this process had larger specific surface area of 15-60 m^2/g which is much larger than that of the paricles given by the conventional way. It is expected that the calcined fine powder with such a large surface area can be used as SO_2 solvent in a desulfurization process.

将直径为1-30μm的细石灰石颗粒送入直径为500-1500μm的中颗粒流化床，在800-1000℃的温度范围内连续进行煅烧。用旋风分离器和袋式过滤器收集从床中夹带的煅烧石灰石颗粒。实验考察了该煅烧系统中床层温度、石灰石粒度、气体在床层中的平均停留时间等影响煅烧转化率的主要因素对煅烧转化率的影响。并从比表面积和孔径分布的角度对煅烧颗粒进行了研究。通过实验阐明了各因素与煅烧转化率之间的关系。该系统适宜的焙烧温度范围为850～950℃，在一定条件下转化率高达97％。分析发现，与传统方法相比，该方法提供了高煅烧转化率、更低的温度和更短的颗粒停留时间。通过该工艺得到的煅烧颗粒具有较大的比表面积，为15-60 m^2/g，远大于传统方式得到的颗粒。具有如此大表面积的煅烧细粉有望在脱硫过程中用作SO_2溶剂。