超厚料层烧结料面喷吹天然气生产实践

Production practice of natural gas injection on sintering material surface of ultra-thick layer

针对在钢铁行业绿色生产实现“碳达峰、碳中合”背景下烧结工序降耗减碳的问题,在中天钢铁550 m烧结机上开展了930 mm超厚料层烧结料面顶吹天然气工业化试验,并综合分析了天然气喷吹量对烧结负压、转鼓强度、w(FeO)、低温还原粉化率、内返率以及矿相结构的影响。结果表明:当天然气喷吹量从0 m/h逐步升高到600 m/h时,固体燃料消耗逐步降低,最低较基准降低了3.77 kg/t,固体燃料降幅达到7.0%,贡献烧结工序CO减排9.19 kg/t;在中天当前烧结原料和工艺条件下最佳的天然气喷吹量为300 m/h水平。下一步需要进一步完善天然气喷吹装置和提升气固燃料耦合燃烧度,以取得更大的烧结减碳效果。

Aiming at the problem of reducing consumption and reducing carbon in the sintering process under the background of “carbon peak and carbon nuetrality” in green production in the iron and steel industry, an industrialized test of natural gas injection on sintering material surface of 930 mm ultra-thick layer is carried out on a 550 m~2 sintering machine of Zenith Steel.The effects of natural gas injection on the negative sintering pressure, drum strength, FeO content, low temperature reduction pulverization rate, internal reversion rate and ore phase structure are analyzed.The results show that when the natural gas injection volume is gradually increased from 0 m~3/h to 600 m~3/h, the solid fuel consumption is gradually decreased, and the lowest is 3.77 kg/t lower than the baseline, the solid fuel is decreased by 7.0%,contributing to the sintering process COemission reduction of 9.19 kg/t;under the current sintering raw materials and process conditions in Zenith Steel, the optimal natural gas injection rate is 300 m~3/h.The next step is to further improve the natural gas injection device and enhance the gas-solid fuel coupling combustion degree to achieve greater carbon reduction in sintering.