超高料层烧结是钢铁行业减碳的重要措施,但随着料层高度增加,产品质量严重不均,对高炉冶炼产生不利影响。通过对10余台料高不小于900mm的烧结机台车取样分析发现,烧结矿质量不均主要体现在台车纵向、横向及台车间,其根本原因在于台车上混合料粒度、成分和热量的不合理,无法实现均质成矿。针对以上问题,研究构建了均质烧结理想料层结构,开发出基于液相成分调控的优化配矿技术、强化混匀制粒技术、混合料仓-台车协同布料技术、风量重构烧结技术等,通过优化烧结液相成分范围,调控料层液相生成与热量相匹配,提高热量与风量的利用效率,实现均质成矿。系列技术实施后,烧结固体燃耗降低1.2~7.9kg/t;烧结矿转鼓强度提高3%~6%、极差减少至5.08%;烧结矿冶金性能改善,RDI+3.15mm提高10%、RDI-0.5mm极差减小至1.99%;高炉利用系数提高,每吨铁燃料比最高降低6.58kg/t。
Abstract
Super-high bed sintering is an important route to reduce carbon emissions in the steel industry. However, as the sintering bed depth increases in practice, the severe inhomogeneity of sinter products adversely affects the blast furnace production. Joint analysis of mixture and sinter was carried out on more than 10 industrial sintering machines in China with bed depth of not less than 900 mm. It is revealed that the inhomogeneous quality of sinter products mainly manifested in the longitudinal direction, transverse direction, and between the strands. The root reason is that the uneven liquid phase composition and heat caused by unreasonable distribution of mixture particle size, chemical composition, and air cannot satisfy the requirements of liquid phase homogeneous mineralization. To address the above problems, an ideal bed structure matching the liquid phase and heat was developed. Besides, the optimized ore blending technology for liquid phase composition regulation, the enhanced mixing and granulation technology, synergistic feeding technology, and air reorganization sintering technology were developed to achieve this bed structure. By optimizing the chemical composition of liquid phase, regulating the distribution of liquid phase within the sintering bed, and matching the heat with the liquid phase quantity, the efficiency of heat and suction was improved, and homogeneous mineralization was achieved. After the implementation of those technologies, the solid fuel consumption was reduced by 1.2-7.9 kg/t, the tumble index increased by 3%-6%, and the difference of tumble index within the sintering bed was reduced to 5.08%. Furthermore, the metallurgical performance of the sinter improved, with the reduction disintegration index RDI+3.15 mm increasing by 10% and the difference of RDI-0.5 mm decreasing to 1.99%. The productivity of the blast furnace improved, and the solid fuel consumption was reduced by 6.58 kg/t at the highest.
关键词
低碳炼铁 /
超高料层烧结 /
均质成矿 /
优化配矿 /
料层结构
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Key words
low carbon ironmaking /
super-high bed sintering /
homogeneous mineralization /
optimized ore blending /
bed structure
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脚注
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基金
国家自然科学基金资助项目(52274290);河北省科技计划资助项目(23564101D)
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