Experimental Studies On Desulfurization And Denitrification Using Adsorbent Adsorption/Microwave Desorption

The over-reliance on coal which constituted major part of energyconsumption structure led to the increasing emissions of sulfur dioxideand nitrogen oxides. At present, flue gas desulfurization （FGD） andselection catalytic reduction denitrification （SCR） were primary means ofcontrolling emissions of SO₂and NO_xrespectively. There existed someproblems in the two methods of removing pollutants, such as large initialinvestment、 high operating costs and causing secondary pollution and soon. In order to reduce costs, the research on new、 efficient andenvironmentally friendly desulfurization and denitrificationsimultaneously was an important issue.Activated carbon irradiated by microwave played a very good effecton removing sulfur and nitrogen oxides, but the inadequacies of thismethod were that with the reduction reaction, the carbon was consumed alot, and a lot of CO was produced. The mixed adsorbent of zeolite andactivated carbon can improve desulfurization and denitrificationperformance of activated carbon irradiated by microwave. The papermainly researched the effect on physical and chemical properties ofadsorbent irradiated by microwave, and the performance of degradation ofsulfur and nitrogen oxides using mixed adsorbent of13X zeolite andactivated carbon. Experimental results showed that13X zeolite had agood effect on adsorbing SO₂and NO, while the microwave irradiationhad a significant role on promoting its adsorption properties; thetemperature of13X zeolite was increased with the increasing of themicrowave power; the more of the amount of the adsorbent was, thegreater its maximum temperature was; Mixed adsorbent of zeolite and activated carbon was significantly better than the separately using ofzeolite or activated carbon; the capacity of adsorbing SO₂and NO showedan upward trend with increasing desorption power, when reached to420W,adsorption capacity and removing efficiency reached the maximum; fiveregenerations of mixed adsorbent was still a certain role on adsorbingsulfur and nitrogen oxide.In addition, in order to reduce the microwave power and improve theeconomics of running the process, studied the adsorbent withcopper-based catalyst by experiment, mainly analyzing the impact ofcatalyst loading, drying time, microwave power, adsorbent component onsimultaneous desulfurization and denitrification. The results showed thatthe adding of catalyst greatly facilitate the reaction proceeds, and reducedthe best reaction desorption power from420W to280W.