喷吹煤气高炉冶炼的极限焦比研究
Study on the Limit of Coke Rate in Gas-Injection Blast Furnace
投稿时间:2017-10-08  修订日期:2017-10-18
DOI:
中文关键词:  喷吹煤气,高炉,极限焦比,煤气量,直接还原度
英文关键词:gas-injection, blast furnace, limit of coke rate, gas volume, direct reduction degree
基金项目:国家自然科学基金重点支持钢铁联合基金资助项目(高炉喷煤新技术)(U1360205)
作者单位E-mail
兰臣臣 东北大学 冶金学院 15081586028@163.com 
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中文摘要:
      本文提出用煤气代替煤粉进行喷吹,简化了高炉冶炼过程,使得喷吹煤气的高炉冶炼达到焦比极限成为可能。应用焦比与直接还原度的联合计算方法,研究了喷吹煤气新工艺下的极限焦比值。结果指出:煤气仅进行间接还原时,高炉冶炼1000kg生铁的总耗热为1506849.53kJ/tFe,焦比为238.88kg/tFe,直接还原度为0.20。而煤气在风口区燃烧提供热量时,高炉冶炼1000kg生铁的总耗热为1873112.57kJ/tFe,焦比为258.89kg/tFe,直接还原度为0.34。当喷入的煤气一部分在风口区燃烧供热和一部分在间接还原区进行间接还原时,喷煤气高炉才能达到极限焦比值。直接还原度和极限焦比都随着喷入的煤气量的增加而先减小后增大。计算得到喷煤气高炉的极限焦比值为124.76kg/tFe,喷入的煤气量为1127.97m3/tFe,直接还原度可降到0.044,新工艺冶炼需要的单位生铁总热量为1074599.9kJ/tFe。
英文摘要:
      This paper presents using the gas-injection to instead of coal. It simplifies the smelting process, and provides possibilities for reaching the limit of coke rate. The limit of the new technology of the gas-injection BF was studied with the method of joint computing using the coke rate and direct reduction degree. The results show that when the gas only carries out the indirect reduction, the total thermal consumption of smelting 1000kg iron is 1506849.53kJ/tFe, the coke rate is 238.88kg/tFe, and the direct reduction degree is 0.20. When the gas burns in the tuyere area to provide heat, the total thermal consumption of smelting 1000kg iron is 1873112.57kJ/tFe, the coke rate is 258.89kg/tFe, and the direct reduction degree is 0.34. When a part of gas in tuyere area combust and provide heat and a part of gas carry out the indirect reduction, the gas-injection blast furnace smelting can reach the limit value. The direct reduction degree and limit coke rate both decrease firstly and then increase with the amount of gas-injection increase. The coke rate limit value in the gas-injection blast furnace is 124.76kg/t.. The amount of gas-injection is 1127.97m3/tFe, and the direct reduction degree can be reduced to 0.044, the total thermal consumption of smelting 1000kg iron is 1074599.9kJ/tFe under the new process conditions.
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