烟气循环与梯级富氧耦合烧结技术分析

Analysis on sintering technology of flue gas circulation coupled with step oxygen enrichment

为实现“碳达峰、碳中和”既定目标,高能耗钢铁行业全力推进碳减排工作,加快低碳前沿技术的研发与应用。本文聚焦长流程烧结工序,深究烟气循环烧结工艺与富氧烧结技术的细节问题,开发烟气循环与梯级富氧耦合烧结技术;依据气体特性合理选取烧结机风箱烟气O_(2)体积分数,在循环烟道支管内形成1%~2%的梯级富氧,将高O_(2)体积分数(18%~20%)的中高温气流介质供给烧结。该技术重点利用富氧弥补循环烟气中O_(2)体积分数不足的缺点,提高烧结料层中燃料的燃烧效率,实现低品质烧结烟气余热高效回收、固体燃料消耗降低和烧结矿产、质量提升等多种功能需求。

In order to achieve the established goal of “carbon peaking and carbon neutrality”,the high-energy steel industry has made every effort to promote carbon emission reduction and accelerate the R&D and application of low-carbon cutting-edge technologies.The long-process sintering process is focused on, the details of the flue gas cycle sintering process and oxygen enrichment sintering technology are deeply investigated, and the flue gas circulation and step oxygen enrichment coupling sintering technology are developed.According to the gas characteristics, the O_(2)volume fraction of the sintering machine bellow flue gas is reasonably selected, and 1%~2% of step oxygen enrichment is formed in the circulating flue branch, and the medium and high temperature gas flow medium with a high O_(2)volume fraction(18%~20%)is supplied to the sintering.This technology focuses on using oxygen enrichment to make up for the shortcomings of insufficient O_(2)volume fraction in circulating flue gas, improve the combustion efficiency of fuel in the sintering material layer, and realize the efficient recovery of waste heat of low-quality sintered flue gas, the reduction of solid fuel consumption, sintered minerals, quality improvement and other functional requirements.