Fundamental study on iron ore sintering new process of flue gas recirculation together with using biochar as fuel
来源期刊：中南大学学报(英文版)2014年第11期
论文作者：GAN Min(甘敏) 范晓慧 姜涛 CHEN Xu-ling(陈许玲) YU Zhi-yuan(余志元) JI Zhi-yun(季志云)
文章页码：4109 - 4114
Key words：iron ore sintering; biomass fuel; flue gas recirculation
Abstract: It is of great significance for cleaner production to substitute bio-energy for fossil fuels in iron ore sintering. However, with the replacement ratio increasing, the consistency of heat front and flame front is broken, and the thermal utilizing efficiency of fuel is reduced, which results in the decrease of yield and tumble index of sinter. Circulating flue gas to sintering bed as biochar replacing 40% coke, CO in flue gas can be reused so as to increase the thermal utilizing efficiency of fuels, and the consistency of two fronts is recovered for the circulating flue gas containing certain CO2, H2O and lower O2, which contributes to increasing the maximum temperature, extending the high temperature duration time of sintering bed, and results in improving the output and quality of sinter. In the condition of circulating 40% flue gas, the sintering with biomass fuels is strengthened, and the sintering indexes with biomass fuel replacing 40% coke breeze are comparative to those of using coke breeze completely.
GAN Min(甘敏), FAN Xiao-hui(范晓慧), JIANG Tao(姜涛), CHEN Xu-ling(陈许玲), YU Zhi-yuan(余志元), JI Zhi-yun(季志云)
(School of Minerals Process and Bioengineering, Central South University, Changsha 410083, China)
Abstract:It is of great significance for cleaner production to substitute bio-energy for fossil fuels in iron ore sintering. However, with the replacement ratio increasing, the consistency of heat front and flame front is broken, and the thermal utilizing efficiency of fuel is reduced, which results in the decrease of yield and tumble index of sinter. Circulating flue gas to sintering bed as biochar replacing 40% coke, CO in flue gas can be reused so as to increase the thermal utilizing efficiency of fuels, and the consistency of two fronts is recovered for the circulating flue gas containing certain CO2, H2O and lower O2, which contributes to increasing the maximum temperature, extending the high temperature duration time of sintering bed, and results in improving the output and quality of sinter. In the condition of circulating 40% flue gas, the sintering with biomass fuels is strengthened, and the sintering indexes with biomass fuel replacing 40% coke breeze are comparative to those of using coke breeze completely.
Key words:iron ore sintering; biomass fuel; flue gas recirculation
