持续降低烧结工序能耗的关键协同技术开发与应用

Development and application of key synergistic technologies continuously reducing energy consumption in sintering process

为助力钢铁行业高质量发展,持续降低烧结工序能耗,本文立足马钢烧结工艺特点,通过采用烧结基础配矿与过程参数互耦调控技术,实现烧结配矿运行实绩评价预测,得到的固体燃料消耗预测模型5‰命中率达到88%以上。通过改善燃料和石灰石的粒度及分布,烧结饼上下层R和FeO质量分数极差,分别降低了0.17和1.41,固体燃料消耗同比降低1.09 kg/t。烧结矿SiO_(2)质量分数降低至4.90%左右,MgO质量分数由2.00%降低至1.39%,固体燃料消耗降低了3.24 kg/t。通过合适控制风箱风量分配,利用系数同比上升0.021 t/(m^(2)·h),固体燃料消耗降低1.66 kg/t。采用料面均匀喷吹焦炉煤气的技术,烧结固体燃料消耗同比降低3.19 kg/t。采用高温蒸汽加热辅助搅拌炼钢污泥等辅助烧结技术,固体燃料消耗降低4.16 kg/t。并通过节能点火炉技术、烧结智能控制技术以及漏风监测和燃烧比控制技术,显著降低点火煤气消耗量和风机电耗。通过持续降低烧结工序能耗关键协同技术的应用,烧结工序能耗(折标煤)由66.36 kg/t降低至当前的46.17 kg/t,有力支撑了烧结工艺技术的高质量发展。

In order to promote the high-quality development of the iron and steel industry and continuously reduce the energy consumption of the sintering process,based on the characteristics of the sintering process of Ma’anshan Iron and Steel Co.,Ltd.,the performance evaluation and prediction of sintering ore proportioning is realized by adopting the mutual coupling control technology of basic sintering ore proportioning and process parameters,and the 5‰hit rate of the obtained solid fuel consumption prediction model is reached by more than 88%.By improving the particle size and distribution of fuel and limestone,the mass fraction range of R and FeO in the upper and lower layers of the sinter cake is reduced by 0.17 and 1.41,and the solid fuel consumption is reduced by 1.09 kg/t year-on-year.When the mass fraction of sinter SiO_(2) is reduced to about 4.90%and the mass fraction of MgO is reduced from^(2).00%to 1.39%,the solid fuel consumption is reduced by 3.24 kg/t.By properly controlling the air distribution of wind box,the utilization factor is increased by 0.021 t/(m^(2)·h)year-on-year,and the solid fuel consumption is reduced by 1.66 kg/t.Using the technology of uniform injection of coke oven gas on the charge level,the consumption of sintered solid fuel is reduced by 3.19 kg/t year-on-year.Using high-temperature steam heating to assist stirring steelmaking sludge and other auxiliary sintering technologies,the solid fuel consumption is reduced by 4.16 kg/t.Through energy-saving ignition furnace technology,sintering intelligent control technology,air leakage monitoring and combustion ratio control technology,the ignition gas consumption and fan power consumption are significantly reduced.Through the application of key synergistic technologies to continuously reduce the energy consumption of the sintering process,the energy consumption(discounted standard fuel)in the sintering process is reduced from 66.36 kg/t to the current 46.17 kg/t,which strongly supports the high-quality development of sintering process technology.