Experimental Study On Integrated Removal Of Pollutants In Flue Gas By Medium Temperature Catalytic Oxidation

From the relevant data of the energy industry in China over the years,it can be seen that although China has been optimizing the energy structure in recent years,the proportion of coal in total energy consumption has been decreasing year by year,but coal is still the most used energy in China.In 2019,Chinese coal consumption accounted for 57.7%of total energy,of which coal consumption for thermal power generation accounted for the largest share of total coal consumption.The SO2,NO,and heavy metals released by the combustion of coal will cause immeasurable harm to human health and the natural environment.In the past,the main method of controlling flue gas pollutants was the hierarchical tandem treatment method,but it has many drawbacks,so the economic,efficient,and environmentally friendly integrated treatment technology of flue gas pollutants has become a research hotspot.At present,the integrated pollutant removal technology of catalytic oxidation method has become a hot research direction.Researchers have found that metal oxides have good catalytic oxidation performance on NO and Hg0 in flue gas,and metals such as Ce,Co,Cu are widely used In the field.Based on the previous literature research,this paper uses a hydrothermal method to prepare a series of Ce and Co catalysts with different Cu doping ratios,and tests the simultaneous denitration under various reaction conditions on a fixed bed catalytic oxidation experimental platform.Mercury removal efficiency.As the doping ratio of Cu is changed,the physical and chemical properties of the catalyst change.The experimental results show that the appropriate amount of Cu doping is beneficial to the improvement of catalyst activity.When the Cu doping amount is 5%,the catalyst has the best activity.Under the conditions of reaction temperature of 25℃,flue gas flow rate of 0.5L/min,catalyst dosage of 0.3g,O2 concentration of 10%,NO inlet concentration of 450mg/m3,and Hg0 inlet concentration of 80μg/m3,the catalyst has For the best activity,the oxidation efficiency of NO and Hg0 are 80.1%and 85%,respectively.The sulfur resistance test and stability test show that the catalyst also has certain sulfur resistance and good stability.Through BET and SEM analysis,it is found that the appropriate amount of Cu doping can increase the pore volume and pore size of the catalyst BET specific surface area,which is beneficial to the uniform distribution of active components on the catalyst surface to enhance the activity of the catalyst.Finally,through XRD,XPS,and FT-IR characterization methods,the reaction mechanism of simultaneous denitration and mercury removal experiment was preliminarily speculated.It was found that both the lattice oxygen and surface adsorbed oxygen on the catalyst participated in the reaction,and the synergistic effect between the metals was more beneficial to the catalytic oxidation of NO and Hg0.