不同反应性炭的气化差异及对铁矿还原的影响  

Gasification differences of different reactive carbons and their effects on iron ore reduction

作　　者：魏汝飞 柯技 李家新 郑宝松 龙红明 WEI Ru-fei;KE Ji;LI Jia-xin;ZHENG Bao-song;LONG Hong-ming(School of Metallurgical Engineering,Anhui University of Technology,Ma′anshan 243002,Anhui,China;Manufacturing Department of Ironmaking,Rizhao Steel Holding Group Co.,Ltd.,Rizhao 276806,Shandong,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]日照钢铁控股集团有限公司炼铁制造部,山东日照276806

出　　处：《钢铁》2022年第3期27-35,共9页Iron and Steel

基　　金：国家自然科学基金资助项目(U1860113)。

摘　　要：纯氧高炉和煤气化耦合联产是降低炼铁和煤气化工艺能耗和碳排放的重要手段,而研究不同反应性炭的气化差异及其对铁矿石还原影响是实现煤气调质与降低焦比的关键。在模拟纯氧高炉与煤气化耦合联产工艺条件下进行了木炭、兰炭、焦炭的气化和烧结矿、球团矿的还原试验研究。研究结果表明,3种炭与CO_(2)和水蒸气的反应性由强到弱的顺序为木炭>兰炭>焦炭,与CO_(2)开始反应温度依次为650.0、730.0、877.5℃,与水蒸气开始反应温度依次为613.5、672.0、841.5℃,3种炭与水蒸气反应特征温度均低于与CO_(2)的反应温度。木炭、兰炭、焦炭与CO_(2)反应活化能依次为109.51、119.31、176.84 kJ/mol,与水蒸气反应活化能依次为167.59、211.67、238.65 kJ/mol,3种炭中木炭反应性最强,其活化能最低。高反应性炭的加入可以促进铁矿的还原,木炭和兰炭促进作用都优于焦炭。与不加炭时相比,加入反应性最强的木炭后烧结矿还原度提高了13.72%,球团矿还原度提高了18.37%。与加焦炭的相比,加入反应性最强的木炭后烧结矿还原度提高了2.07%,球团矿的还原度提高了14.98%。在高炉冶炼中,可以使用适量的高反应炭代替焦炭,一方面降低焦比,另一方面可以促进CO_(2)、水蒸气向CO、H2转化,提高煤气品质。Coupling of pure oxygen blast furnace and coal gasification is an important way to reduce energy consumption and carbon emission in ironmaking and coal gasification process.The key to realize gas conditioning and coke ratio reduction is to study the gasification difference of different reactive carbons and its impact on iron ore reduction.The experimental studies for gasification of charcoal,semi-coke and coke and the reduction of sinter and pellet ore were carried out under condition of simulating the coupling process of oxygen blast furnace and coal gasification.The results show that the order of reactivity for three carbons with CO_(2) and steam is charcoal>semi-coke>coke,the reaction starting temperatures with CO_(2) are 650.0,730.0 and 877.5℃,respectively,and the reaction starting temperatures with steam are 613.5,672.0 and 841.5℃,respectively.The characteristic reaction temperatures of three carbons with steam are all lower than that with CO_(2).The activation energies of charcoal,semi-coke and coke with CO_(2) are 109.51,119.31 and 176.84 kJ/mol,respectively,while the activation energies with steam are 167.59,211.67 and 238.65 kJ/mol,respectively.Among the three kinds of carbons,charcoal has the best reactivity and the lowest activation energy.Addition of high reactive carbon can promote the reduction of iron ore,thus the promotive action of charcoal and semi-coke is better than that of coke.Compared with the situation that is no carbon addition,after adding the most reactive charcoal,the reduction degree of sinter and pellet increase by 13.72%and 18.37%respectively.Compared with adding coke,adding the most reactive charcoal increases the reduction degree of sinter and pellet by 2.07%and 14.98%respectively.In blast furnace,an appropriate amount of high reactive carbon can be used to replace coke,so as to reduce the coke ratio,promote the conversion of CO_(2) to CO and steam to H2 and improve the quality of gas.

关 键 词：氧气高炉 煤气化 高反应性炭 气化反应 铁矿石还原 煤气调质 

分 类 号：TQ546[化学工程—煤化学工程] TF53[冶金工程—钢铁冶金]