Experimental And Mechanism Study On The Removal Of High Concentration Nitrogen Oxides In The Flue Gas By Pre-Oxidization

Currently, the construction of denitration in China’s power industry has made breakthrough progress. But, the NOx removal of industrial boilers,which have the features of small capacity, large number,scattered distribution and buring the low quality coal, is still in its infancy. In this paper, glass furnace is treated as example to discuss the removal of high concentration nitrogen oxides in industrial furnace.O3multi-pollutant control technology is firstly applied in glass furnaceflue gas treatment.The mechanism of pre-oxidation and removal of high concentration nitrogen oxides in the flue gas was studied and the main contents are summarized below:1st,By oxidizing the high concentration NOx in glass furnace flue gas by active molecule ozone, the relationship between O3/NO molar ratio, concentration of SO2, temperature and NOxremoval efficiency was carried out. At room temperature, oxidation efficiency of NO increased with O3/NO molar ratio and reached97%when O3/NO molar ratio was1.2. Concentrationof SO2had negative effect on the oxidation efficiencyof NO. The temperature caused large changes in the oxidation product of NO.2nd, the oxidation product of high concentration nitrogen oxides in the flue gas was removed by lye in the spray tower. Results of experiment showed the effect of O3/NO molar ratio, liquid-gas ratio, concentration of NaOH, NaHCO3, SO2and spray product on the NOx removal efficiency. It reached70%as the concentration of NaOH was0.5%and the O3/NO molar ratio was1.6. NOx removal efficiency of NaOH was obviously higher than NaHCO3.3rd, NaClO, Na2S and Na2S2O3were individually added into NaOH solution as additive. Results of experiment showed the effect of O3/NO molar ratio, Liquid-gas ratio, concentration of additive and SO2on the NOx removal efficiency. Reaction mechanism of NO2and Na2S was carried out by long-running experiment.NOx removal efficiencies of reductive additive were comparatively higher than those of oxidizing additive. Both Na2S and Na2S2O3could enhance substantially NOX removal efficiency and realize the simultaneous removal purpose of NOx and SO2.4th, detailed program on harmless treatment for denitration byproduct nitrite was provided. The effects of reaction time, pH, ClO-/NO2-molar ratio and the initial concentration of nitrite were studied accordingly. Results uncovered that pH value exists a critical impact on the oxidation efficiency. In acidic environment, the oxidation efficiency increased with ClO-/NO2-molar ratio linearly. Nitrite was completely transformed into nitrate within at the ClO-/NO2-molar ratio of1.1...