| Recently coal-fired flue gas denitrification has become one of the major tasks for environmental protection,and the wet flue gas simultaneous desulfurization and denitrification which based on wet flue gas desulfurization has turned into a popular research topic of controlling air pollution.In view of the current existence of ammonia in the presence of ammonia escape escalation problems and high operating costs,NO gas phase oxidation of the existence of low ozone generation,high oxidation costs,liquid absorption and absorption of high cost of absorption additives,slow mass transfer rate and easy to produce secondary pollution.This paper based on advanced oxidation technology proposed a semi-dry method of denitrification,In this project,H2O2 is stimulated by NTP to generate high concentration of ·OH,· O and ·O2 which are effective on the oxidation of NO,and the connection between the oxidation in gas-phase and the absorption in liquid-phase is informed to develop a efficient denitrification technology with low cost.The main research of the project includes the stimulated mode and mechanism of H2O2 by NTP,the designing of the reasonable electrode structure,the constructing of the efficient NTP excitation system,and the effects of discharge parameters,oxidant conditions,and flue gas conditions on NO oxidation performance.The technologycan meet the emissions requirements of SO2 and NOx simultaneously and has broad prospects.The research shows that the electrode structure is an important factor in the stability of the discharge and the output power.The H2O and O2 have limited NO removal capacity under the condition of plasma,the technology can reach 90%denitrification efficiency with adding 30%H2O2 and 16kV voltage.Initial NO concentration has little effect on the discharge characteristics,the efficiency decreases as the concentration increases under the same power conditions.Increasing the flow rate will slightly suppress the discharge,the NO removal efficiency will increase with the residence time.The denitrification efficiency is the highest at 120?,and the change of temperature will lead to the decrease of denitrification efficiency.The acid conditions>the alkaline conditions>the neutral conditionsfor the excitation of hydrogen peroxide,so the optimum pH range is 4 to 5.Appropriate increase in humidity is conducive to the oxidation of NO,but too high humidity lead to reduce NO removal efficiency.The higher the oxidation degree of NOx,the better the absorption effect of NaOH. |
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