工程科学学报2016，Vol.38Issue(8)：1082-1090,9.DOI:10.13374/j.issn2095-9389.2016.08.006
高炉处理烧结烟气脱硫脱硝理论分析
魏付豪 1刘建华 1季益龙 1李康伟 1刘洪波 1刘建1
作者信息
- 1. 北京科技大学冶金工程研究院，北京100083
- 折叠
摘要
Abstract
The technical feasibility of desulfurization, denitration and dioxin removal from sintering flue gas processed by blast furnace was discussed in theory. The reduction thermodynamics of sulfur dioxide and nitrogen oxides as well as the conditions for diox-in decomposition in a blast furnace were analyzed. The effects of blast with sintering flue gas instead of air on the theoretical flame temperature ( TFT) , blast volume, gas in hearth, top gas and sulfur content of hot metal were investigated. The results show that sul-fur dioxide and nitrogen oxides can be reduced in the BF interior, and the lowest equilibrium volume fractions of sulfur dioxide, nitric oxide and nitrogen dioxide are 1. 84í10 -13%, 3. 08í10 -11% and 3. 72í10 -21%, respectively. Favorable thermodynamic condi-tions for dioxin decomposition are found in the blast furnace. Sulfur dioxide and carbon monoxide in sintering flue gas have little effect on the TFT, while nitrogen oxides can slightly increase the TFT. The TFT decreases by about 40. 5℃ with a 1% increase in carbon dioxide volume fraction of sintering flue gas, but the thermal state of a hearth can be improved to the normal level by reducing the hu-midity and increasing the oxygen enrichment of blast. The blast volume, gas in hearth and top gas decrease with increasing carbon di-oxide content of sintering flue gas. As the carbon dioxide content of sintering flue gas rises, the carbon monoxide and hydrogen con-tents of gas in hearth and the carbon monoxide, hydrogen, carbon dioxide and water contents of top gas increase, but the nitrogen con-tents of gas in hearth and top gas decrease. The sulfur quality content of hot metal is proportional to the sulfur dioxide content of flue gas and it is raised to 0. 025% when the sulfur dioxide content increases to 2000 mg·m-3 . The BF production can proceed smoothly with sintering flue gas blast instead of air through comprehensive operating measures, achieving the purpose of desulfurization, denitra-tion and dioxin removal.关键词
高炉/烧结/烟气处理/脱硫/脱硝Key words
blast furnaces/sintering/flue gas treatment/desulfurization/denitration分类
矿业与冶金引用本文复制引用
魏付豪,刘建华,季益龙,李康伟,刘洪波,刘建..高炉处理烧结烟气脱硫脱硝理论分析[J].工程科学学报,2016,38(8):1082-1090,9.
