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对利用高炉处理烧结烟气同时脱硫脱硝脱二噁英技术的可行性进行了理论探讨,分析高炉内部还原二氧化硫和氮氧化物,以及分解二噁英的热力学条件,探讨烧结烟气代替空气鼓风对理论燃烧温度、风量、炉缸煤气、炉顶煤气和铁水硫含量的影响.结果表明:二氧化硫、一氧化氮和二氧化氮的最低平衡体积分数分别为1.84×10-13%、3.08×10-11%和3.72×10-21%,高炉内部还原二氧化硫和氮氧化物是可行的;高炉具有分解二噁英的有利热力学条件;烟气中二氧化硫和一氧化碳对理论燃烧温度的影响可忽略,氮氧化物能略微提高理论燃烧温度,二氧化碳体积分数增加1%,理论燃烧温度降低大约40.5℃,但通过降低鼓风湿度和提高富氧率等措施,能达到高炉正常生产时的炉缸热状态水平;随着烟气中二氧化碳含量的增加,风量、炉缸和炉顶煤气量都逐渐降低,炉缸煤气一氧化碳和氢气含量增加,炉顶煤气中一氧化碳、氢气、二氧化碳和水含量都增加,氮气含量显著降低;铁水硫含量与烟气二氧化硫含量成正比,但当二氧化硫质量浓度达到2000 mg·m-3,铁水中硫质量分数仅为0.025%,铁水质量仍合格.通过综合调节高炉操作参数,也可以实现烧结烟气代替空气鼓风进行高炉炼铁生产,达到脱硫脱硝脱二恶英的目的.
The feasibility of simultaneous desulfurization and denitrification of dioxins by using blast furnace to treat sinter flue gas is theoretically discussed. The thermodynamic conditions of reducing sulfur dioxide and nitrogen oxides inside the blast furnace and decomposing dioxin are analyzed. The effects of sintering flue gas instead of air blast The results showed that the minimum equilibrium volume fractions of sulfur dioxide, nitrogen monoxide and nitrogen dioxide were 1.84 × 10-13% and 3.08 × 10, respectively, for theoretical combustion temperature, air volume, hearth gas, -11% and 3.72 × 10-21%, respectively. It is feasible to reduce sulfur dioxide and nitrogen oxides inside the blast furnace. The blast furnace has the favorable thermodynamic conditions for decomposing dioxins. The influence of sulfur dioxide and carbon monoxide on the theoretical combustion temperature in the flue gas is negligible. Oxide can slightly increase the theoretical combustion temperature, the volume fraction of carbon dioxide increases by 1%, and the theoretical combustion temperature decreases by about 40.5 ℃. However, by lowering the blowing air humidity and increasing the oxygen enrichment rate, the hearth thermal state can be reached at normal blast furnace production ; With the increase of carbon dioxide in the flue gas, the air volume, hearth and top gas volume are gradually reduced, the hearth gas carbon monoxide and hydrogen content increased In addition, the content of carbon monoxide, hydrogen, carbon dioxide and water in the top gas increased and the nitrogen content decreased significantly. The content of sulfur in the molten iron was directly proportional to the content of sulfur dioxide in the flue gas, but when the concentration of sulfur dioxide reached 2000 mg · m-3, The score is only 0.025%, the quality of molten iron is still qualified.By comprehensive adjustment of blast furnace operating parameters, sintering flue gas can also be achieved instead of air blast blast furnace ironmaking to achieve the purpose of desulfurization and denitrification dioxins.