The Experimental Study Of H₂O₂/multiple Metal Ions Synergistic Removal Of NO_X/SO₂

At present,the most mature technology for treating NOx and SO₂ emission of gas pollutants in power plants is limestone gypsum wet flue gas desulfurization?WFGD?and selective catalytic reduction?SCR?denitration.Ultra-low emissions in response to the atmospheric pollution control requirements,on the basis of WFGD add a SCR system,the system complex,high operation cost,and the processing of waste catalyst of SCR has become an increasingly important problem.Better as a result,the use of wet flue gas desulfurization technology,based on the add high-performance liquid tioxidant,supplemented by catalyst,implementing various air pollutants efficient removal at the same time,risk of the modification of existing wet desulphurization equipment is small,and oxidant is green environmental protection,the collaborative desulfurization denitration method has broad application prospects.In this paper,we first analyzed the performance of different liquid oxidizing agents,selected the green environmental oxidant H₂O₂,and analyzed the mechanism of H₂O₂ oxidation and denitration,the economic efficiency of denitration,and the feasibility of the simultaneous desulfurization and denitration of H₂O₂.The possible path of NO_X/SO₂ absorption on CaCO₃/H₂O₂slurry was analyzed.Secondly,the orthogonal design experiment of single H₂O₂ denitration was carried out to analyze the orthogonal experiment.Based on the rate of denitration,the influence of stirring speed,reaction temperature,initial pH value and H₂O₂ concentration factor was investigated.The results of the experiment showed the factors affecting the denitration of H₂O₂:the influence of stirring speed>the initial pH value of>H₂O₂ concentration>reaction temperature.In order to further improve the effect of H₂O₂ denitration,the different transition metal ions additives(Fe²⁺,Mn²⁺,Co²⁺,Al³⁺)for H₂O₂ catalytic desulfurization and denitration mechanism were explored and the experimental results showed that Fe²⁺,Mn²⁺,Co²⁺,Al³⁺on the catalytic oxidation of SO₂efficiency were above 83.6%,far more than 76.4%of CaCO₃ wet desulphurization;Fe²⁺,Mn²⁺,Co²⁺,Al³⁺had the maximum removal efficiency of NO is 55.5%,55.7%,40.7%and 48.14%,respectely.Desulfurization and denitrification experiments for four transition metal ions at different concentrations indicated that there were differences in the substance concentration between different matching ratio.The substance concentration is 32mmol/L analyzed by data of SO₂ removal rate was significantly larger than that of 25mmol/L,which was analyzed by data of NO removal rate.it is concluded that the best ratio of metal ions of Fe²⁺,Mn²⁺,C_O^2+,Al³⁺and the amount of substance concentration is 10 mmol/L,5 mmol/L,8 mmol/L,2 mmol/L.Finally,the best combination of transition metal ions catalytic oxidation and synergistic removal of NOx/SO₂ efficiency of calcium carbonate slurry ware carried out by using reseponse surface model,and improve the model.The model showed that the interaction of H₂O₂concentration and SO₂ flow rate,H₂O₂ concentration and reaction temperature,SO₂ flow rate and reaction temperature had a great influence on NO removal efficiency.the experiment data and conclusions were given support bye the model,and removal of NO_X/SO₂ by synergistic transition metal ions with H₂O₂ as oxidant on WFGD wre more pworful,which wre high efficiency and green environmental protection,and provided a certain experiment for the further research in the future.