张宣科技氢基竖炉提质降耗的措施

Measures for Product Quality Improvement and Consumption Reduction in Shaft Furnace of ZXHT

张宣科技氢基竖炉投产初期,COG单耗较高,DRI金属化率不稳定、含碳量较高、抗压强度偏低,储运和使用过程中DRI产生粉末较多,且由于DRI结构疏松、气孔率高,易发生再氧化。通过采取提升球团矿质量、适当提高竖炉进口温度、合理调控还原循环气体成分及钝化储存等措施,提质降耗取得显著成效。2023年10月-2024年2月,氢基竖炉平均COG单耗降低166m^(3)/t,矿比降低至1368kg/t,DRI金属化率提高0.59个百分点,一级品率明显提高;DRI含碳量稳定,抗压强度超过800N/个球,脱氧泥产生量降低6.1kg/t,含粉率降低2.43个百分点。

In its early operation stage after startup,the hydrogen-based shaft furnace of ZXHT is challenged by its higher COG consumption,unstable metallization rate of DRI,higher carbon content,insufficient compressive strength,more powder generated during storage,transportation and use of DRI,and the DRI is easy to re-oxidize due to its loose structure and high porosity.The corresponding actions we made are represented by improving the quality of pellets,appropriately increasing the reduced gas inlet temperature to shaft furnace,reasonably controlling the composition of reduced circulating gas and adopting passivating storage.The efforts are rewarded with significant achievements in quality improvement and consumption reduc-tion.From May 2023 to February 2024,the consumption of COG of the hydrogen-based shaft furnace falls by 166m^(3)/t,the ore ratio drops to 1368 kg/t,the DRI metallization rate increases by 0.59%,and the first-grade product rate rises greatly;moreover,the DRI carbon content keeps stable,the compressive strength exceeds 800 N/pellet,the generation of deoxidized mud decreases by 6.1 kg/t,and the powder content declines by 2.43%.