ABSTRACT

The HIsarna process is a new and breakthrough smelting reduction process for hot metal (liquid iron) production from iron ores and coal directly fed into the reactor. The flue gas from the main reactor enters the off-gas system containing small amounts of H₂, CO and carbon particles which need to be removed before further treatment by post combustion oxygen injection. A three-dimensional Computational Fluid Dynamics (CFD) simulation of the HIsarna off-gas system is performed and validated using a detailed reaction mechanism and kinetic data for post-combustion of a CO–H₂ mixture and carbon particles. Using the validated model, a series of simulations were performed to investigate the effect of water quenching and post combustion oxygen injection. It was found that water quenching can significantly reduce the off-gas temperature. It is also possible to reduce oxygen injection during operations where inlet CO content of the off-gas system is low.

摘要

HIsarna 工艺是一种新的突破性熔炼还原工艺，用于从直接送入反应器的铁矿石和煤中生产铁水（液态铁）。来自主反应器的烟道气进入尾气系统，其中含有少量的 H ₂、CO 和碳颗粒，这些颗粒需要在通过后燃烧氧气注入进一步处理之前去除。HIsarna 尾气系统的三维计算流体动力学 (CFD) 模拟使用详细的反应机理和 CO-H _{2后燃烧的动力学数据进行验证}混合物和碳颗粒。使用经过验证的模型，进行了一系列模拟来研究水淬和燃烧后氧喷射的影响。发现水淬可以显着降低废气温度。在废气系统的入口 CO 含量低的操作期间，也可以减少氧气注入。