高压电晕放电与液相化学氧化协同脱除烟气中NO的影响因素与机理

Influential Factors and Mechanism of NO Removal in Flue Gas by High Voltage Corona Discharge with Liquid Chemical Oxidation

为了解高压电晕放电与液相化学氧化协同脱硝的影响因素与机理,研究了在高压电晕放电与液相化学氧化的协同作用下,供电电压、水体积流量、吸收剂种类以及NO初始质量浓度、烟气体积流量等因素对脱硝效率的影响,探讨了高压电晕放电与液相化学氧化协同脱硝的机理。NO气体经流量计与空气混合形成模拟气体,输送至反应器内进行反应后排放。测定NO质量浓度,计算烟气脱硝效率。结果表明:脱硝效率随着供电电压、水体积流量、吸收剂浓度的增加而增加,但随着NO初始质量浓度、烟气体积流量的增加而下降。在3 k V高压电晕放电和质量分数为5%的H_2O_2协同作用下,烟气脱硝效率高达60.2%。高压电晕放电和液相化学氧化烟气脱硝具有明显的协同效应。脱硝机理主要包括气相电晕放电等离子体氧化反应和液相氧化吸收反应。

In order to understand influential factors and mechanism of the denitration by high-voltage corona discharge with liquid chemical oxidation together, we investigated the effects of the power supply voltage, water volume flow, species of liquid solution, initial mass concentration of NO and flue gas volume flow on the denitration efficiency by corona discharge with liquid chemical oxidation. The reaction mechanism of NO removal by corona discharge with chemical oxidation was discussed. NO releasing from gas cylinder was mixed with air in a mixer, then transported to the discharged reactor. NO was oxidized by corona discharge, and the mass concentration of NO was analyzed at inlet and outlet of the reactor. The denitration efficiency was obtained. The experimental results show that the denitration efficiency increases with the increases of power supply voltage, water volume flow, and concentration of absorption solution, but decreases with the increases of initial mass concentration of NO and flue gas flow. Under the synergistic effect of corona discharge（3 k V） and H2O2（5%）, the denitration efficiency is up to 60.2%. The corona discharge with chemical oxidation can greatly increase the denitration efficiency. The reaction mechanism of NO removal by corona discharge with chemical oxidation mainly includes corona discharge oxidation in the gas phase and oxidation absorption in the liquid phase.