The utility model discloses a gas based reduction shaft furnace, which comprises a furnace body, an inner circumference reducing trachea, a peripheral reduction pipe and a gas supply pipe for providing the reduction gas to the peripheral reduction trachea and the inner circumference reducing trachea. The preheating area, the reduction zone and the cooling area are connected in the furnace body from top to bottom, and the top of the furnace body is equipped with material import. The bottom of the furnace body is equipped with a material outlet. The inner circumference of the reduction trachea is a ring, the inner circumference of the reduction trachea is located in the reduction area, and the inner circumference of the inner circumference of the tube wall of the reduction trachea is provided with an inner circumference nozzle. The outer reduction pipe forms a ring, and the peripheral reduction pipe is located in the reduction area and surrounds the outer side of the reduction pipe, and there is a peripheral nozzle on the outer wall of the reduction pipe. According to the gas base reduction shaft furnace of the utility model, the production efficiency of the shaft furnace can be improved effectively and the energy consumption of DRI is reduced. It is simple in structure and convenient in operation to increase the utilization coefficient of the shaft furnace by adding the inner circumference reduction gas to the uniform gas distribution.
【技术实现步骤摘要】
气基还原竖炉
本技术涉及非高炉冶炼的还原竖炉,具体为可降低能耗、提高竖炉中心温度、均匀分布煤气流的一种还原气管布置。
技术介绍
随着世界钢铁工业的飞速发展和国际社会对环境保护的日益重视,铁矿石、焦炭、优质废钢资源的日益减少以及DRI价格大幅上涨,直接还原工艺在世界各地迅速发展,直接还原工艺也逐渐受到钢铁界领域的重视。气基竖炉直接还原铁占直接还原铁总产量的70%以上,其直接还原铁产品具有成分稳定、有害杂质低、粒度均匀等优点,它可作为特殊优质钢冶炼的原料。气基直接还原设备可大型化、对环境污染小、耗水量少、噪音小、产生的CO2也比用煤作还原剂少得多,所以具有很强的竞争力和发展潜力。传统竖炉主体结构包括顶部装料系统、中部还原段、下部设置的冷却及出料系统。还原段上部设有炉顶煤气排放管,下端设置还原气管道、围管和按圆周设置的还原气喷嘴组。还原气由竖炉还原段围管喷嘴输入与炉内氧化球团发生还原反应,但是炉内中心煤气流及温度偏低,导致能耗高、中心球团金属化率偏低。现有技术公开的一种“具有中心配气装置的竖炉和控制配气量的方法”,将现有竖炉内的导料锥加高后镂空打眼,并且在炉外加装向其内 ...
【技术保护点】
一种气基还原竖炉,其特征在于,包括:炉体,所述炉体内由上到下依次限定出连通的预热区、还原区和冷却区,所述炉体的顶部设有物料进口,所述炉体的底部设有物料出口;内围还原气管,所述内围还原气管形成为环形,所述内围还原气管设在所述还原区内,所述内围还原气管的管壁上设有内围喷嘴;外围还原气管,所述外围还原气管形成为环形,所述外围还原气管设在所述还原区内且环绕在所述内围还原气管的外侧,所述外围还原气管的管壁上设有外围喷嘴;以及,用于向所述外围还原气管和所述内围还原气管提供还原气体的供气管。
【技术特征摘要】
1.一种气基还原竖炉,其特征在于,包括:炉体,所述炉体内由上到下依次限定出连通的预热区、还原区和冷却区,所述炉体的顶部设有物料进口,所述炉体的底部设有物料出口;内围还原气管,所述内围还原气管形成为环形,所述内围还原气管设在所述还原区内,所述内围还原气管的管壁上设有内围喷嘴;外围还原气管,所述外围还原气管形成为环形,所述外围还原气管设在所述还原区内且环绕在所述内围还原气管的外侧,所述外围还原气管的管壁上设有外围喷嘴;以及,用于向所述外围还原气管和所述内围还原气管提供还原气体的供气管。2.根据权利要求1所述的气基还原竖炉,其特征在于,所述内围还原气管环绕所述还原区的竖直中心线设置且形成圆环形,所述内围还原气管的圆心与所述还原区的竖直中心线相重合。3.根据权利要求2所述的气基还原竖炉,其特征在于,所述内围还原气管环绕形成的圆环的...
【专利技术属性】
技术研发人员:邓君,薛逊,曹志成,冯鲁兴,唐敬坤,韩志彪,吴道洪,
申请(专利权)人:江苏省冶金设计院有限公司,
类型:新型
国别省市:江苏,32
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