Pilot test of H2O2 low temperature catalytic oxidation for desulfurization and denitrification
H2O2 low-temperature catalytic oxidative desulfurization and denitrification technology can be applied to low-temperature flue gas in the deep peaking process of coal-fired power stations.In this work,a pilot hot state experimental system was built,industrial honeycomb TiO2 catalysts were selected with characterizations by XRD,XRF and SEM,and an integrated experimental study of desulfurization and denitrification was carried out to investigate the influence of various factors on the efficiency of low-temperature catalytic oxidative denitrification of H2O2.The results showed that the nano-TiO2 particles were uniformly distributed,well dispersed and highly pure under microscopic conditions.In separate denitrification experiment,temperature had minor effect on the NO oxidation and removal efficiency.When the catalyst was not used,the oxidative removal of NO mainly relied on the oxidizing property of H2O2 itself and a small amount of ‧HO2 generated by the decomposition of H2O2,which is less effective.With the increase of H2O2/NO molar ratio after the adoption of catalyst,the efficiency of NO oxidation and removal was greatly improved compared with that without catalyst.In the desulfurization and denitrification experiments,the oxidation and removal efficiency of NO was significantly promoted by SO2 under the uncatalyzed condition.While under the catalyzed condition,there was a competitive effect between NO and SO2 on the utilization of ‧OH when the molar ratio of H2O2/(NO+SO2)was 0.5,and the oxidation and removal efficiency of NO was gradually enhanced and that of SO2 was gradually reduced with the increase of SO2 concentration.With the introduction of honeycomb TiO2 catalyst,when the H2O2/NO molar ratio was 8,the NO oxidation efficiency reached 90.4%,the NOx removal efficiency reached 63.7%,and the SO2 removal efficiency could reach 100%.
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