高炉处理烧结烟气脱硫脱硝理论分析

发布时间：2017-12-27 03:01

本文关键词：高炉处理烧结烟气脱硫脱硝理论分析　出处：《工程科学学报》2016年08期 　论文类型：期刊论文

【摘要】：对利用高炉处理烧结烟气同时脱硫脱硝脱二VA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VA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VA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.
[Abstract]:The use of blast furnace processing sintering flue gas simultaneous desulfurization and denitrification feasibility of two VA technology is discussed in theory, analysis of internal blast furnace reduction of SO2 and NOx, and decomposition of thermodynamic conditions two VA English, to explore the influence of sintering flue gas instead of air blast on the theoretical combustion temperature, air flow, hearth gas, top gas and molten iron sulfur content the minimum balance. The results show that the volume fraction of nitric oxide and nitrogen dioxide and sulfur dioxide were 1.84 * 10-13%, 3.08 * 10-11% and 3.72 * 10-21%, inside the blast furnace reduction of SO2 and NOx is feasible; blast furnace has favorable thermodynamic conditions of decomposition of two VA; sulfur dioxide and carbon monoxide in flue gas on the theoretical combustion temperature effect can be neglected and nitrogen oxides can slightly improve the theoretical combustion temperature, the volume fraction of carbon dioxide increased by 1%, the theoretical combustion temperature was reduced by about 40.5 C, but by reducing the blast humidity and increase the rate of oxygen, can reach the thermal state of the hearth when the level of the normal production of the blast furnace; with the increase of the content of carbon dioxide in flue gas, air, hearth and top gas quantity gradually decreased and the increase of hearth gas of carbon monoxide and hydrogen content of top gas of carbon monoxide, hydrogen, carbon dioxide and water content increased nitrogen content decreased significantly; the iron sulfur content and the content of sulfur dioxide in flue gas is proportional to, but when the sulfur dioxide concentration reached 2000 mg - M-3, the mass fraction of sulfur is only 0.025% in molten iron, molten iron quality is still qualified. By means of adjusting the operating parameters, can realize sintering flue gas instead of air blower for blast furnace ironmaking production reached desulfurization and denitrification of dioxin.
【作者单位】：北京科技大学冶金工程研究院;
【分类号】：X757
【正文快照】： 烧结烟气约占钢铁行业大气污染物的60%以上,为降低烧结烟气中SO2、NOx、二VA英等污染物排放,目前国内外已经普遍采用烧结烟气脱硫技术和烧结烟气综合处理技术[1-3],包括石灰石/石灰--石膏法、双碱法、氧化镁法、氨--硫酸铵法、综合脱硫新技术(newintegrated desulfurization,N

【相似文献】