【作者】 郭丽；

【导师】 方觉；

【作者基本信息】 河北理工大学 ， 钢铁冶金， 2006， 硕士

【摘要】 在焦煤资源日趋缺乏的今天,COREX流程使用非焦煤资源作为主体燃料,从根本上改善了炼铁工业的能源结构,其优势日渐显著。COREX是唯一实现工业化的熔融还原流程,为中国钢铁行业的可持续性发展带来了机遇。由于发展史较短,目前的COREX流程具有宽广的发展和完善空间。COREX的主要问题有两个,其一是煤耗过高,其二是仍需使用一定比例的焦炭,以补充有效热值和形成含碳固定床。这些问题使国内许多对COREX流程感兴趣的企业望而却步。我国在非焦煤资源上占有一定优势,贮量大,选择范围广。基于此原因,希望通过熔炼煤性质研究,找到降低煤耗与能耗的有效措施。采用还原竖炉热模型确定了实验室条件下的最佳还原周期,最终测试了还原气利用率,并推导其理论公式;使用高温可调气氛抗压实验机测试煤的热稳定性;经工业分析测得熔炼煤及矿石成分,并通过计算得到相应有效热值、煤气成分与熔炼热。通过对以上指标及其关系研究,得到流程优化的关键是还原气供求平衡,并确定此条件下的金属化率。经研究得知,熔炼煤的性质对COREX流程的影响至关重要。使用有效热值适当的熔炼煤可以降低COREX流程的煤耗;选用热稳定性高的煤种可以避免使用焦炭;还原气供求平衡时,整个流程的净能耗降至最低,流程得以优化。通过对熔炼煤性质的研究,找到了降低流程煤耗与净能耗的有效措施,并为COREX熔炼煤的选择提供较高的参考价值。更多还原

【Abstract】 Charred coal storage has been short for recent years. Meantime, COREX process has been famous with usage of normal coal. It changes energy arrangement in iron-making process. It is the only one of smelting and reduction processes which has been industrialized.Now, COREX is still a potential and developing process. There are two main problems in the process. Coal consumption of COREX is too much and coke is still used to supply effective calorific value of coal and form a fix bed with carbon. So corporations inland are cautious about COREX process.Coal storage in our country is rich. So, a research on coal properties was carried out to find an effective way to decrease energy consumption in COREX process.A simulating reductive shaft was used to find the best reduction cycle. Reductive gas utilization ratio and its theoretic formula were got from experiment. A high temperature compression resistive machine was used to test heat stability of coal. Components of smelting coal and iron ore were got from technical analysis. Effective calorific value of coal,component of reductive gas and smelting heat of ore were calculated from the analysis. From researching on relationships between above all, it was proved that the balance of gas needing and supplying was the key to COREX process optimization. At the balance, metallization ratio could be confirmed.From research, it was proved that smelting coal properties were important to COREX process. Proper effective calorific value of coal could decrease coal consumption. Smelting coal with high heat stability could avoid coke usage. Energy consumption was minimized at the balance of gas needing and supplying.An effective method was found to decrease coal and energy consumption from research. It could be valuable reference for selecting smelting coal in COREX process.更多还原