电极喷嘴布置对NO电晕氧化过程影响的试验研究

Experimental Study on Effects of the Collocation of Electrode Nozzle on the Corona Discharge Process of NO oxidation

使用湿空气作为自由基源物质 ,研究了电极喷嘴布置对电晕放电特性、NO电晕氧化过程的影响 .结果表明 ,随着电极喷嘴数的增加 ,总电晕区域变大 ,流光的脉动重复率增加 ,NO的氧化率提高 .试验条件下 ,对应B(14 )、B(8)、A(7)、A(4 )的放电电极 ,电晕反应器NO的氧化率最高可分别达到 65 3 %、5 0 5 %、5 1 3 %、2 7 5 % .采用喷嘴数较多的电极时 ,NO电晕氧化的能量效率较高 ,有效工作区内 ,对应B(14 )、B(8)、A(7)、A(4 )的放电电极 ,电晕反应器NO氧化的能量效率最高分别为 5 3 1g·kWh- 1 、5 0 2g·kWh- 1 、5 0 7g·kWh- 1 、3 8 0g·kWh- 1 ,它们对应的NO氧化率分别为 5 3 8%、42 5 %、48 8%、2 3 0 % .喷嘴数目相同时 ,A型电极所形成的电晕流光在电晕反应器内具有更好的充满度 ,更有利于烟气NOx 脱除 .

With moist air used as the radical source, an experiment was carried out to investigate the effects of the Collocation of Electrode Nozzle on corona discharge characteristics and NO corona oxidation process. The results showed that some advantages, such as the larger active zone by corona discharge,higher rate of streamer repetition and NO oxidation efficiency, could be obtained with increasing the number of nozzles from four to fourteen. The maximum NO oxidation efficiencies were 65.3%、50.5%、51.3%、27.5% for electrode nozzles of B(14)、B(8)、A(7)、A(4), respectively. Higher energy yield of NO oxidation could be obtained by employing the electrode with more nozzles. The maximum energy yields of NO oxidation were 53.1g·kWh^(-1)、50.2g·kWh^(-1)、50.7 g·kWh^(-1)、38g·kWh^(-1) for nozzle electrodes of B(14)、B(8)、A(7)、A(4) in regular working zone, respectively; and their corresponding values of NO oxidation efficiencies were 53.8%、42.5%、48.8%、23.0% , respectively. NO_x removal from the flue gas could be enhanced by using the A-type electrode because of the uniform distribution of streamer corona inside the reactor under the same nozzles.