摘要
对于以流态化预还原和铁浴终还原相衔接的熔融还原炼铁过程,利用计算机系统模化方法,建立了用于该流程系统评估的通用计算机程序软件,针对以低预还原度(25-35%)与高二次燃烧率(55-85%)相结合或以高预还原度(55-75%)与低二次燃烧率(5-20%)相结合为技术特征的两类流程,从能耗及自身能量利用、煤、氧消耗及铁浴热效率等过程指标进行了对比和分析,着重考察了不同的煤气二次燃烧率及矿石预还原度对系统可行性及各项指标的影响。
A general computer program is developed for the smelting reduction process of fluidized bed prereduction of iron ore followed by final smelting reduction in a molten iron bath. Several process indexes, such as energy consumption and utilization, coal and oxygen consumption, as well as heat efficiency in the molten iron bath are analyzed and compared for two different cases considered: 1, low prereduction degree (PRD: 25-35%) and high post combustion ratio (PCR: 55-85%), 2, high PRD (55-75%) and low PCR (5-20%). The influence of PCR and PRD on system feasibility and process indexes are also investigated. Based on the calculated results, the following major conclusions may be drawn: 1. The process combining low PRD (25-35%) with high PCR (>50%) in a molten iron bath has significant advantages over that with high PRD not only in heat efficiency of iron bath, but also in process energy consumption and its utilization, coal and oxygen consumption. Therefore, the circulating fluidized bed as a prereduction reactor would be more attractive. 2. The maximum PCR in the molten iron bath may be limited by sufficiently large gas reduction potential, which is necessary for certain designated PRD. However, there exists a feasible operating region of PCR under different prereduction temperatures. The maximum PCR would decrease with increase of PRD. 3. Within the feasible operating region of PRD and PCR, the increase of PCR would result in obvious increase in heat efficiency of the iron bath, decrease of coal and oxygen consumption, as well as improvement of energy consumption and its utilization of the whole process system.
出处
《化工冶金》
CSCD
北大核心
1992年第1期17-23,共7页
基金
中国科学院和国家自然科学基金联合资助项目
关键词
熔融还原
系统模化
二次燃烧
炼铁
Smelting reduction System simulation Gas post combustion Fluidized bed Molten iron bath
