ABSTRACT

Top gas recycling technology is an effective means to reduce fuel consumption and CO₂ emission in the ironmaking field. In this work, a static mathematical model of COREX process combined with top gas recycling technology is developed based on material and energy balance. The influence of three types of top gas recycling, such as the recycle gas without CO₂ removal (RG-1), the recycle gas after CO₂ removal (RG-2) and the heated recycle gas after CO₂ removal (RG-3), on the operation parameters and CO₂ emissionsis investigated. Results show that the theoretical combustion temperature can be significantly reduced by injecting the three kinds of recycle gas at tuyere. The fuel rate and integrated fuel rate can be decreased by injecting the three kinds of recycle gas. The injection of the RG-3 can most effectively reduce the CO₂ emission of COREX process, followed by the RG-2 and RG-1.

摘要

炉顶煤气回收技术是炼铁领域降低燃料消耗和CO ₂排放的有效手段。在这项工作中，基于物质和能量平衡，建立了结合炉顶气回收技术的 COREX 工艺静态数学模型。未脱除CO ₂的循环气（RG-1）、脱CO ₂后的循环气（RG-2）和脱除CO ₂后的加热循环气（RG-3 ）三种炉顶气循环的影响)，关于运行参数和 CO ₂排放进行了调查。结果表明，在风口处注入三种循环气可显着降低理论燃烧温度。通过注入三种循环气体可以降低燃料消耗率和综合燃料消耗率。注入RG-3最能有效减少COREX工艺的CO ₂排放，其次是RG-2和RG-1。