Combustion behavior and influence mechanism of CO on iron ore sintering with flue gas recirculation
来源期刊：中南大学学报(英文版)2014年第6期
论文作者：FAN Xiao-hui(范晓慧) YU Zhi-yuan(余志元) 甘敏 CHEN Xu-ling(陈许玲) JI Zhi-yun(季志云)
文章页码：2391 - 2396
Key words：flue gas recirculation; heat transfer front; flame front; combustion behavior
Abstract: The properties of circulating gas have a significant effect on sintering with flue gas recirculation, and the influence of CO in sintering process was investigated. The results show that the post-combustion of CO conducts in sinter zone when flue gas passes through the sintering bed, which releases much heat and reduces the consumption of solid fuel. The ratio of coke breeze can be reduced from 5% to 4.7% with 2% CO in circulating flue gas. In addition, with the increase of CO content in circulating flue gas, the combustion efficiency of fuel is improved, and the flame front is increased slightly while still matches with the heat transfer front. These are beneficial to increasing the maximum temperature and prolonging the high temperature duration, especially in the upper layer of sintering bed. As a consequence, the productivity, vertical sintering velocity and quality of sinter are improved.
FAN Xiao-hui(范晓慧), YU Zhi-yuan(余志元), GAN Min(甘敏), CHEN Xu-ling(陈许玲), JI Zhi-yun(季志云)
(School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract:The properties of circulating gas have a significant effect on sintering with flue gas recirculation, and the influence of CO in sintering process was investigated. The results show that the post-combustion of CO conducts in sinter zone when flue gas passes through the sintering bed, which releases much heat and reduces the consumption of solid fuel. The ratio of coke breeze can be reduced from 5% to 4.7% with 2% CO in circulating flue gas. In addition, with the increase of CO content in circulating flue gas, the combustion efficiency of fuel is improved, and the flame front is increased slightly while still matches with the heat transfer front. These are beneficial to increasing the maximum temperature and prolonging the high temperature duration, especially in the upper layer of sintering bed. As a consequence, the productivity, vertical sintering velocity and quality of sinter are improved.
Key words:flue gas recirculation; heat transfer front; flame front; combustion behavior
