摘要
Process control is an effective approach to reduce the NO_(x) emission from sintering flue gas.The effects of different materials adhered on coke breeze on NO_(x) emission characteristics and sintering performance were studied.Results showed that the coke breeze adhered with the mixture of CaO and Fe_(2)O_(3) or calcium ferrite significantly lowers the NO_(x) emission concentration and conversion ratio of fuel-N to NO_(x).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 NO_(x) emission concentration was decreased from 220 mg/m^(3) to 166 mg/m^(3),and the conversion ratio of fuel-N was reduced from 54.2%to 40.9%.
过程控制是降低烧结烟气NO_(x)排放的有效途径。研究了焦粉粘附不同物质时对NO_(x)排放和烧结指标的影响。结果表明,当焦粉粘附CaO和Fe_(2)O_(3)的混合物或者铁酸钙时能减少燃料氮向NO_(x)的转化从而降低NO_(x)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,NO_(x)平均排放浓度可由220 mg/m^(3)降至166 mg/m^(3),燃料氮转化率可由54.2%降至40.9%。
基金
Project(2017YFC0210302)supported by the National Key R&D Program of China
Projects(U1660206,U1760107)supported by the National Natural Science Foundation of China
作者简介
Corresponding author:周志安,Senior Engineer,E-mail:35394690@qq.com,ORCID:0000-0003-0829-0789。
