Study On The Removal Of Low Concentration CO In Sintering Flue Gas

A large amount of gas pollutants will be produced during the sintering process of steel,which will seriously damage the environment.What’s more,carbon monoxide is one of the main air pollution sources.Based on the characteristics of the sintering tail flue gas,suitable removal schemes of low-concentration CO was proposed.And the key issues encountered in the process were studied.Firstly,the the removal efficiency of Fenton’s reagent for low-concentration CO was studied.This work presents the effects of stoichiometry,temperature,and residence time in the reactor to the removal efficiency.The results show that when the temperature of the flue gas is higher than 400℃,the removal efficiency of Fenton’s reagent can reach 50%.And as the temperature rises,the removal efficiency is higher.But it remains stable when temperature is over 600°C.Secondly,two types of CO catalysts is introduced.Pt-supported catalyst and Ce-doped Fe₂O₃ catalyst catalysts are prepared by the impregnation method.The results show that different initial CO concentrations,temperature and humidity have a great influence on the removal efficiency of CO catalytic oxidation.When there is no water vapor in flue gas,the CO removal rate of two catalysts is over 60%.When the reaction temperature is 180°C and the relative humidity is 11.7%,the CO conversion rate of the Pt-supported catalyst is 63.9%,while the other one is only about 35%.In the range of 180-300℃,Pt-supported catalyst has better water resistance and sulfur resistance.Finally,to study the effects of CuO-CeO₂ on the reduction of CO in the sintering process,this work has prepared different types of fuel.Then the ratio of CO after burning is measured by TG-FTIR.The results show that when the mass ratio of CuO-CeO₂ changes from 0 to 3ωt%,the ratio of CO in the mixed gas generated after combustion decreases significantly.And the combustion efficiency of different types of fuel has great difference from each other.