Experimental And Mechanism Studies On Desulfurization And Denitrification Using Microwave Swing Irradiation Over Activated Carbon

Coal-fired units installed capacity will also continues to increase for China’s energy structure in the future, sulfur dioxide and nitrogen oxides and smoke will increase. The power plant emissions of air pollutants if it is not effective control, that will directly affect the quality of atmospheric environment improvement and sustainable development of the power industry. Therefore, researching flue gas purification technology which has a high efficiency and low cost, so multi-pollutant control technology is an important topic which the sustainable development faces.This paper studies the new method which removes sulfur dioxide and nitrogen oxides in flue gas, first the activated carbon adsorps for sulfur oxide and nitrogen oxides, in flue gas, and then is irradiated by microwave. The new method is not only the desulfurization and denitration integration, and has the very high removal efficiency. Through the experimental study the influence of adsorption capacity and removal efficiency by microwave irradiation power (reaction temperature), space velocity, regeneration frequency, goal pollutant concentration and flue gas coexisting ingredients. The results show that, adsorption capacity and removal efficiency of NO reduce with the increasing of SO2content in flue gas; adsorption capacity of NO increases slightly first and drops to12.79mg/g and desulfurization efficiency descends with the increasing of the concentration of SO2. With the increasing of oxygen (O2) content in flue gas adsorption capacity SO2declines, but adsorption capacity NO increases, removal efficiencies of NO and SO2would be greater than99%. Adsorption capacity of NO declines with the increasing of moisture content in flue gas, but adsorption capacity of SO2increases and removal efficiencies of NO and SO2would be stable. Adsorption capacities of NO and SO2both decrease with the increasing CO2content, efficiencies of desulfurization and denitrification augment at the beginning stage, whereas CO2content exceed12.4%, efficiencies of desulfurization and denitrification start to fall. At the same time, Experimental study of the catalyst in order to reduce the microwave power and improve the economics of technology, by comparing the activated carbon supported copper base, zinc base, manganese base catalyst for denitrification in three different efficiency, and ultimately determine the selection of optimal catalyst for the oxidation of copper.And copper oxide catalyst loading, the addition of the catalyst on the reaction temperature and other research.The results showed that after adding the catalyst the reaction temperature reduce200℃. Also XRD analysis test was carried out to definite the chemical composition of the catalyst.Finally, the mechanism of desulfurization and denitrification using microwave irradiation over activated carbon is analyzed, including the adsorption mechanism, reduction, mechanism and other non-thermal effects of microwave.