富氢气体喷吹对高炉冶炼工况的影响规律  

Effect of hydrogen-rich gas injection on smelting operation of blast furnace

作　　者：张卫国 张宗旺[1] 徐润生[1] 张建良[1] 叶涟 朱进锋 ZHANG Weiguo;ZHANG Zongwang;XU Runsheng;ZHANG Jianliang;YE Lian;ZHU Jinfeng(l.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Sinosteel Equipment and Engineering Co.,Ltd.,Beijing 100080,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]中钢设备有限公司,北京100080

出　　处：《钢铁研究学报》2023年第9期1065-1073,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(52274316);中央高校基本科研业务费专项资金资助项目(FRF-IDRY-20-014);新疆维吾尔自治区重大科技专项资助项目(2022A01003);五矿集团科技专项经费资助项目(2021ZXD01)。

摘　　要：为了研究富氢气体进行高炉喷吹对于冶炼工况的影响,建立高炉喷吹富氢气体的能质平衡模型,研究了天然气、焦炉煤气、炉顶循环煤气喷吹量对燃料比、直接还原度、炉腹煤气量、氢利用率、炉腹煤气量以及CO_(2)排放量的影响。对风口理论燃烧温度的计算方法进行修正,将原燃料灰分吸热、未燃烧煤粉吸热、甲烷分解吸热等因素考虑在内,计算结果更精确。富氢气体喷吹可不同程度地降低直接还原度,发展间接还原,减少燃料消耗。当富氧率和焦比不变时,天然气对于直接还原度、风口焦炭质量、理论燃烧温度的影响最大,焦炉煤气其次,循环煤气最小。天然气、焦炉煤气、循环煤气喷吹量每提高10 m^(3),直接还原度分别降低0.014、0.009、0.002 4,风口燃烧焦炭量分别增加3.22、2.01、0.55 kg,理论燃烧温度分别增加20、14.33、10.17℃。高炉喷吹富氢气体后高炉CO_(2)产生量和排放量减少,其中天然气喷吹的CO_(2)减排效果最显著,与基准期相比,喷吹60 m^(3)天然气时CO_(2)排放量减少了9.46%。In order to study the effect of blast furnace injection of hydrogen-rich gas on the lip-flow condition,the energy and mass balance model of blast furnace injection of hydrogen-rich gas was established,and the influences of the injection amount of natural gas,coke oven gas and top circulating gas on fuel ratio,direct reduction degree,belly gas amount,hydrogen utilization rate,belly gas amount and CO_(2) emission were studied.Taking into account factors such as the heat absorption of raw fuel ash,the heat absorption of unburned coal powder,and the heat absorption of methane decomposition,the calculation method for the theoretical combustion temperature of the tuyere has been revised to obtain more accurate results.Hydrogen-rich gas injection can reduce the degree of direct reduction,develop indirect reduction and reduce fuel consumption.When the oxygen enrichment rate and coke ratio remain unchanged,natural gas has the greatest influence on the degree of direct reduction,the quality of coke in tuyere and the theoretical combustion temperature,followed by coke oven gas and circulating gas.The direct reduction degree of natural gas,coke oven gas and circulating gas decreases by 0.014,0.009 and 0.0024,respectively,when the injection volume increases by 10 m,tuyere burning coke volume increased by 3.22,2.01 and 0.55 kg,respectively,theoretical combustion temperature increases by 20℃,14.33℃and 10.17℃,respectively.After injecting hydrogen rich gas into the blast furnace,the production and emission of CO_(2)in the blast furnace decreased.The CO_(2) emission reduction effect of natural gas injection is the most significant.

关 键 词：富氢气体喷吹 能质平衡 直接还原度 理论燃烧温度 

分 类 号：TF526.3[冶金工程—钢铁冶金]