Effective Use of Energy in the Direct Reduction Process by Shaft Furnace

竖炉直接还原过程中能源的有效利用

基本信息

批准号：
61550490
负责人：
TAKAHASHI Reijiro
金额：
$ 1.34万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1988
项目状态：
已结题

项目摘要

Shaft furnace process as other process besides blast furnace in developing countries which have much amount of natural resources and energy is operating now. However, studies on the development of new materials and process evaluation from original resources to products are not enough progressed in the ironmaking industries. Improvement on the productivity and energy saving is expected by development of high quality materials and selection of optimum operating conditions.From these standpoint, this study was performed in the following subjects. Firstly, fundamental studies were performed on the production method, reducibility test and physical properties of nonfired pellets. The pellets have some problems for combined water and powder generation, however, it was found that the pellets was useful as the burden materials because of good reducibility.Secondly, applicabilities of nonfired pellets and lumpy iron ore to shaft furnace in laboratory scale were investigated. As some problems were solved on the combined water and decrease of strength of samples during reduction, it was found that the nonfired pellet are possible to apply to the shaft furnace. And then, he phenomena in the shaft furnace were analyzed by the mathematical model. Calculated results were agreed with the experimental ones of shaft furnace under various operating conditions.Lastly, energy evaluation of reduced iron production precess was conducted by the method of exergy analysis. As the results, energy requirement of nonfired process using nonfired pellet was lower than that of fired process.

竖炉法是除高炉之外的其他工艺，在自然资源和能源丰富的发展中国家目前正在运行。但炼铁行业在新材料开发、从原始资源到产品的工艺评价等方面的研究还不够深入。通过开发高品质材料和选择最佳操作条件，有望提高生产率并节省能源。从这些角度出发，本研究进行了以下主题。首先对不烧球团矿的生产方法、还原性试验和物理性能进行了基础研究。球团矿在水和粉末的联合生成方面存在一些问题，但是，人们发现，由于良好的还原性，球团矿可用作炉料。其次，研究了未烧成球团矿和块铁矿石在实验室规模的竖炉中的适用性。由于解决了还原过程中结合水和样品强度下降的问题，发现免烧球团矿在竖炉上的应用是可能的。然后，通过数学模型对竖炉中的现象进行了分析。计算结果与竖炉在不同工况下的实验结果吻合。最后，采用火用分析方法对还原铁生产过程进行了能耗评价。结果，使用免烧球团的免烧工艺的能量需求低于烧制工艺。