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针对某钢铁厂处理含锌粉尘的转底炉直接还原工艺,建立了描述炉膛气体流动、燃烧和传热过程及炉内含碳球团理化反应和传热过程的数学模型,采用实际生产用球团在高温硅钼炉内进行还原实验验证模型的可靠性,得到转底炉炉膛内温度场、流场、压力场及球团内部的温度和组分分布,分析了转底炉主要操控参数对产品铁金属化和脱锌指标的影响.结果表明,炉气流速沿流动方向逐渐增大,炉温最高点出现在还原二段(接近1350℃),球团还原20min出炉后铁金属化率和脱锌率分别达77.9%和92.7%;要使产品铁金属化率达70%,生球碳氧摩尔比不得低于0.9,而配碳量对脱锌率影响不大;煤气供给减少1%将使产品铁金属化率和脱锌率分别降低0.8%和1.3%,二次风欠供20%时二者分别下降14%和24%;球团中锌还原脱除后在炉气中再次氧化,可通过转底炉烟气除尘系统将富锌粉尘回收并用于有色行业炼锌.
Aiming at the direct reduction process of rotary hearth furnace with zinc dust in a steel plant, a mathematical model describing the gas flow, combustion and heat transfer in the hearth and the physicochemical reaction and heat transfer process of carbonaceous pellets in the furnace was established. Group in the high temperature silicon molybdenum furnace reduction experiments to verify the reliability of the model obtained in the rotary hearth furnace temperature field, flow field, pressure field and pellet temperature and composition of the internal distribution, analysis of the rotary hearth furnace main control parameters Product iron metallization and dezincification index.The results show that the flow rate of furnace gas increases along the flow direction and the highest temperature appears in the second stage of reduction (close to 1350 ℃), and the iron metallization rate The rate of dezincification is 77.9% and 92.7% respectively; to make the iron metallization rate of the product up to 70%, the molar ratio of globule carbon to oxygen can not be lower than 0.9, while the carbon content has little effect on the dezincification rate; the gas supply is reduced by 1% Will make the product iron metallization rate and dezincification rate were reduced by 0.8% and 1.3%, respectively, when the supply of 20% of the secondary air when the two fell 14% and 24% respectively; after the removal of zinc reduction pellets in the furnace again Oxidation, zinc-rich dust can be recovered and used for coloring by a rotary kiln flue gas cleaning system Industry Zinc.