With the arrival of the era of low profit in the steel industry,competition among peers has become more intense,and the country's environmental protection requirements are becoming increasingly stringent.In this context,it is particularly important to implement flue gas circulation sintering technology in the sintering process,which accounts for a large proportion of energy consumption in steel enterprises.Sintering flue gas circulation technology is a technology that recycles all or selectively collected flue gas with high temperature and oxygen content and low pollutant concentration from the wind boxes back to the sintering flue gas hood and then enters the sintering material layer for reuse.This technology can not only effectively utilize the waste heat of sintering flue gas,but also significantly reduce the emission of pollutants in the flue gas.Taking the flue gas circulation system equipped on the Tiantie 360 m2 sintering machine as the research object,the emission reduction effect and mechanism of CO,SO2,and NOx after the application of flue gas circulation technology were analyzed.The results showed that after flue gas circulation,the average content of CO in the flue gas of the wind boxes increased by 15.6％compared to conventional sintering.On the one hand,the circulating flue gas already contains a small amount of CO,and on the other hand,due to the lower oxygen content of the circulating flue gas compared to air,the proportion of incomplete fuel combustion increased.The self carried and newly generated CO participated in the sintering process as the circulating flue gas re-entered the material layer.The emission reduction rates of pollutants such as SO2 and NOx by flue gas circulation reached 29.5％and 31.2％,respectively,effectively reducing the emissions of SO2 and NOx during the sintering process.At the same time,the circulation of hot flue gas is beneficial for improving the quality of sintered ore and reducing fuel consumption.The sintering solid consumption decreased from 49.01 kg/t before application to 48.19 kg/t,and the production increased by 2.2％.After the application of sintering flue gas circulation technology,a comprehensive effect of sintering quality improvement,consumption reduction,and emission reduction has been achieved,which helps enterprises meet increasingly strict environmental protection requirements.
sinteringflue gas circulationhot gas sinteringburn upquality improvementemission reduction
万方数据
维普
