Experimental Study On Removal Of Nitrogen Oxides By Plasma Synergistic Catalyst

With the development of economy and the increase of human ’s demand for energy,the emission of nitrogen oxides will increase day by day,it will cause serious harm to the environment.Therefore,the development of efficient denitration technology is imminent.In coal-fired power plants,the application of selective catalytic reduction is based on ammonia as a return gas and V2O5/TiO2 as catalyst.However,this technology has many defects,such as narrow chemical reaction temperature window,serious loss of catalyst grinding activity,and environmental pollution caused by ammonia leakage.For these problems,an effective solution is to place the denitrification device behind the electrostatic precipitator and desulfurization device,thereby reducing the influence of dust and sulfur dioxide in the flue gas on the performance of the catalyst under long-term operating conditions.However,since the temperature of the flue gas is usually reduced to a lower level after the electrostatic dedusting and desulfurization equipment,the original catalyst activity is greatly reduced.Low-temperature plasma technology can activate the reaction components at low temperature,so it can promote the chemical reaction.Combining it with catalytic technology,it can play a good role in removing nitrogen oxides at low temperatures.Therefore,the combination of plasma and catalytic technology in recent years has become a hot research direction in academia.This method can exerts the advantages of plasma low-temperature activation reaction molecule and high selectivity of catalytic reaction,so it can improve the denitration efficiency of the reaction,and has great potential application value.Based on the selected topic,this paper evaluates the ratio of the MnCuCe/γ-Al2O3 and MnFeCe/γ-Al2O3 catalysts,the preparation conditions and the effect of the flue gas conditions on their activity,and obtains a good low temperature activity.Combine it with plasma technology to explore its denitrification effect.The details are as follows:(1)Studied the effects of preparation conditions on the denitrification performance of the MnCuCe/γ-Al2O3 and MnFeCe/γ-Al2O3 catalysts were evaluated.The optimum mixing ratio and optimal preparation conditions of the two catalysts are obtained,and the obtained catalyst has a good low temperature activity.(2)The effects of simulated flue gas atmosphere conditions such as ammonia-nitrogen ratio,airspeed,the presence and content of oxygen and sulfur dioxide on the denitration efficiency of the catalyst were investigated,and the catalyst conditions for obtaining optimum denitration efficiency and the denitrification activity of the catalyst were obtained.Influence the law.(3)Combine the MnCuCe/γ-Al2O3 and MnFeCe/γ-Al2O3 catalysts with the best activity obtained with the plasma technology to explore the effect of the synergies between the two on denitrification performance and obtain excellent denitrification at low temperatures.effect.