电解海水对模拟船舶柴油机废气的脱硝应用

采用无隔膜电解方法对海水进行电解，研究了电极间距、电解时间、电流密度等不同电解条件对电解海水中ρ（有效氯）的影响，并基于模拟船舶柴油机废气实验台以及自行搭建的喷淋反应系统，初步研究了电解海水的脱硝效果.结果表明:随电极间距由5 mm增至25 mm，电解电压逐渐增加，而电解溶液的pH变化不明显；随着电流密度与电解时间的增加，电解溶液中ρ（有效氯）近似呈线性增加.在电解电流密度为100 mA/cm2、电解时间为30 min时，电解溶液中ρ（有效氯）达到2 288 mg/L.当采用非循环喷淋模式进行脱硝试验时，随着电解海水中ρ（有效氯）的增加，NO去除率迅速提高，在ρ（有效氯）为872 mg/L时，NO去除率达到79%.电解海水溶液的初始pH对脱硝效果影响较大，当pH为6.0~8.0时，NO_x去除率高于40%.当采用循环喷淋模式进行脱硝试验时，随着电解海水中ρ（有效氯）的增加，NO去除率及其持续时间均明显改善，当ρ（有效氯）为2 288 mg/L时，电解海水的NO去除率高于80%，并且循环喷淋持续时间大于50 min.研究显示，电解海水溶液具有良好的脱硝效果，在船舶柴油机废气脱硝方面具有重要的应用潜力和研究价值. 

Application of Electrolyzed Seawater for NO Removal from Simulated Marine Diesel Engine Exhaust Gas

Artificial seawater was electrolyzed in an undivided electrolytic cell.The effects of electrode space, electrolysis time and current density on the yield of available chlorine contents (ACCs) were investigated preliminarily. The electrolyzed seawater was used to remove NO from simulated marine diesel engine exhaust gas in a lab-scale scrubbing reactor, and the effect of ACCs in electrolyzed seawater on NO removal efficiency was further studied. The results showed that, with the electrode space increasing from 5 to 25 mm, the electrolytic voltage increased gradually under the same current density, while the solution pH changed little. With the increase of current density and electrolytic duration, ACCs in electrolyzed seawater increased almost linearly. It was up to 2288 mg/L after electrolyzing for 30 min at the current density of 100 mA/cm2. When the electrolyzed seawater was used to remove NO from simulated flue gas in non-cyclic scrubbing mode, NO removal efficiency increased obviously with the increase of ACCs in electrolyzed seawater. NO removal efficiency was about 79% when ACCs was 872 mg/L.In addition, the pH value of electrolyzed seawater imposed a great impact on the NO removal. When the solution pH was in the range of 6.0-8.0, NO_x removal efficiency was more than 40%. When electrolyzed seawater was used at cyclic scrubbing mode, both NO removal efficiency and the scrubbing duration increased quickly when the initial ACCs in electrolyzed seawater increased. NO removal efficiency was more than 80% and the scrubbing duration was more than 50 min when ACCs in electrolyzed seawater was 2288 mg/L. The experimental results showed that electrolyzed seawater could remove NO from flue gas with high efficiency, and it has great potential in the application of NO removal from marine diesel engine exhaust gas.