The Experimental Study Of Oxidative-Desulfurization In The O₃ Multi-Pollutant Control Technology

With the development of the economy,the environment problems brought by fossile energy consumption have become more and more serious.Thermal power plants,as the major coal consumer,are the main source of pollution.And so the research of simultaneous or combined multi-pollutant control is becoming increasingly important.From the point of the sulfur recovery,the desulfurization in O₃ multi-pollutant control technology has been discussed by experiments in this paper. The main contents are summarized below:1st,A detailed kinetic model of SO₂ low temperature oxidation by ozone was handled by chemkin.The simulation results show that SO₂ is hardly oxidized by ozone in homogeneous low temperature condition and it agree with the experimental results.2nd,Desulfurizers using different transition metal oxide as active component (Active-alumina as carrier) were prepared and then studied for low temperature desulfurization in the presence of ozone.The results indicate that the desulfurizer loaded MnOx shows the best low temperature desulfurization performance.3rd,Using MnOx as active component,desulfurizers made of different carriers were researched for low temperature desulfurization in the presence of ozone.The results show that the active-alumina based desulfurizier has better low temperature desulfurization activity than the others.The desulfurizers were characterized by N₂ physical adsorption/desorption,mercury porosimeter and SEM techonologies and a conclution was drawed that the activity of desulfurizers with different supports depends on not only the BET but also the pore structure.4th,Based on MnOx/Active-alumina desulfurizer,the effects of preparation temperature,load quantity of active component,reaction temperature and NO were investigated with the help of XRD,BET,pore structure characterization.The results show that the desulfurizer with 8%Mn content,prepared at 300℃,gains the best desulfurization performance at 140℃in the presence of O₃ and that NO promotes the desulfurization activity.5th,The penetrated desulfurizer was analyzed by XRD,FTIRand TG and the results indicate that bulk Aluminum-Sulfate and surface Manganese-Sulfate formed during the reaction.6th,On the premise of H₂O₂ formation from O₃ decomposition in water and H₂O₂ clean strong oxidizability like O₃,the liquid-phase oxidation of SO₂ by hydrogen- peroxide was studied.The experimental results show that hydrogen-peroxide has a good oxidation effect on SO₂,and that only[H₂O₂]/[SO₂]mole ratio plays an important role in the oxidation of SO₂ while the other factors investigated such as water bath temperature,initial PH value of absorbent solution,SO₂,O₂ and NO concentration have little effects.Under otherwise definite conditions,the oxidation rate increases with the increasing of[H₂O₂]/[SO₂]mole ratio.When[H₂O₂] /[SO₂]mole ratio is 1,the oxidation rate is 95.18%.