Abstract
Process control is an effective approach to reduce the NOx emission from sintering flue gas. The effects of different materials adhered on coke breeze on NOx emission characteristics and sintering performance were studied. Results showed that the coke breeze adhered with the mixture of CaO and Fe2O3 or calcium ferrite significantly lowers the NOx emission concentration and conversion ratio of fuel-N to NOx. Pretreating the coke with the mixture of lime slurry and iron ore fines helped to improve the granulation effect, and optimize the carbon distribution in granules. When the mass ratio of coke breeze, quick lime, water and iron ore fines was 2:1:1:1, the average NOx emission concentration was decreased from 220 mg/m3 to 166 mg/m3, and the conversion ratio of fuel-N was reduced from 54.2% to 40.9%.
摘要
过程控制是降低烧结烟气NOx 排放的有效途径。研究了焦粉粘附不同物质时对NOx 排放和烧结 指标的影响。结果表明,当焦粉粘附CaO 和Fe2O3 的混合物或者铁酸钙时能减少燃料氮向NOx 的转化 从而降低NOx 排放浓度。用石灰浆和铁矿粉的混合物对焦粉进行预处理,有助于改善制粒效果,优化 制粒小球中的碳分布。当焦粉、生石灰、水、铁矿粉以质量比2:1:1:1 进行混合预处理后参与烧 结,NOx 平均排放浓度可由220 mg/m3 降至166 mg/m3, 燃料氮转化率可由54.2%降至40.9%。
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Foundation item: Project(2017YFC0210302) supported by the National Key R&D Program of China; Projects(U1660206, U1760107) supported by the National Natural Science Foundation of China
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Wang, Zc., Zhou, Za., Gan, M. et al. Process control technology of low NOx sintering based on coke pretreatment. J. Cent. South Univ. 27, 469–477 (2020). https://doi.org/10.1007/s11771-020-4309-y
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DOI: https://doi.org/10.1007/s11771-020-4309-y