熔融炼铁与粉煤气化耦合制备高浓度还原气方法  

Study of smelting reduction iron coupled with pulverized coal gasification to produce high-concentration syngas

作　　者：许建良[1,2] 梁钦锋[1,2] 陈若平[3] 田宝山[3] 邹庆峰[3] 袁万能[3] 刘海峰[1,2] XU JianLiang;LIANG QinFeng;CHEN RuoPing;TIAN BaoShan;ZOU QingFeng;YUAN WanNeng;LIU HaiFeng(Shanghai Engineering Research Center of Coal Gasification,East China University of Science and Technology,Shanghai 200237,China;National Energy Coal Gasification Technology Research and Development Center,Shanghai 200237,China;Baosteel Group Xinjiang Bayi Iron and Steel Co.,Ltd.,Urumqi 830022,China)

机构地区：[1]华东理工大学上海煤气化工程技术研究中心,上海200237 [2]华东理工大学国家能源煤气化技术研发中心,上海200237 [3]宝钢集团新疆八一钢铁有限公司,乌鲁木齐830022

出　　处：《中国科学：技术科学》2021年第2期195-206,共12页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:21878082)资助项目。

摘　　要：钢铁工业是国民经济的基础工业和重要的支柱产业,本文针对传统熔融还原炼铁块状原料消耗高、炉膛空间利用率低等问题,提出了熔融气化炉上部空间耦合粉煤气化制备高浓度炼铁用还原煤气的技术思想,并开发了欧冶炉熔融气化炉.采用数值模拟方法分析了欧冶炉内的多相湍流反应流动特征及气化性能,进行了工业运行研究,工业运行结果与模拟结果吻合.工业运行表明,带有煤粉气流床的欧冶炉炼铁工艺,随着喷煤比增大,焦炭、总燃料和氧气的消耗量降低;当喷煤比为200 kg/t,焦炭消耗量降低约30%,总燃料消耗量降低约12%,总氧消耗量降低约6%,气流床出口有效气浓度达到84%.气化床制备的高浓度还原气极大促进竖炉内氧化铁的还原,降低下部熔融床的还原负荷,大幅提高了炼铁工段的能量利用率.理论研究和工业实践均表明,欧冶炉炼铁工艺为冶金-化工多联产系统提供优质价廉的还原气和合成气.The iron and steel manufacturing industry is a vital industry for a nation’s economy. The traditional smelting reduction ironmaking process has the disadvantages of high consumption of lump coal and coke as well as low space utilization rate. This study proposes a smelting reduction ironmaking process coupled with pulverized coal gasification on the upper part of a smelting furnace. The proposed process is then used to prepare high-concentration reducing gas for ironmaking, and an Ouye gasifier is developed. The characteristics of multiphase turbulent reaction flow and gasification performance in an Ouye gasifier is analyzed through numerical simulation and the results are in good agreement with the industrial operational data. The results of the industrial operation show that coke consumption, total fuel, and oxygen decreases with the increase in the mass ratio of injected pulverized coal to smelting. When the coal injection ratio is 200 kg/t, coke consumption is reduced by approximately 30%, total fuel consumption is reduced by approximately 12%, total oxygen consumption is reduced by approximately 6%, and effective gas concentration at the outlet of the entrained flow bed is up to 84%. A high-quality reducing gas greatly promotes the reduction of iron oxide in the shaft furnace, reduces the reduction load of the smelting bed, and reduces coke consumption, total fuel, and oxygen. Thus, high-quality reducing gas improves the energy utilization rate of the ironmaking process. Both theoretical research and industrial practice show that smelting reduction ironmaking coupled with pulverized coal gasification produces high-quality and low-cost reducing gas and syngas for the metallurgical-chemical polygeneration system.

关 键 词：炼铁 新技术 煤气化 数值模拟 

分 类 号：TQ546[化学工程—煤化学工程] TF557[冶金工程—钢铁冶金]