Treatment of Combustion Gas by the Corona Reactor over Water Surface

提出了一种新型电晕反应器，用于汽车隧道或地下停车位的污染空气净化。设计了水上放电电极反应器作为同时脱除粉尘和NOx的反应器。期望该反应器能更好地进行除尘和等离子体化学反应，使电晕空间产生的离子、臭氧和羟基自由基脱除NOx。为了获得水面电晕放电的基础数据，用多针和锯齿形放电电极测量了正负伏安特性和臭氧产生量。并对不同脉冲电压波形下的脉冲电晕特性进行了测量。实验是在常压和室温下进行的。电晕风致水面起伏时，直流电晕和脉冲电晕对水面均表现出稳定的伏安特性。无论是在直流电晕还是脉冲电晕中，正流光电晕都比负流光电晕产生更多的臭氧。利用模型电晕反应器对柴油机尾气进行了粉尘和NOx治理试验。证实了电晕放电对NOx脱除过程中NO氧化和NO2溶入水以及捕尘的有利条件。

A new type of corona reactor was proposed for the contaminated air cleaning in the automobile tunnel or in the underground parking space. The reactor with the discharge electrode over water was designed as the reactor for removal of dust and NOx simultaneously. The reactor was expected to make the better proceeding of dust collection and the plasma chemical reactions for NOx removal by the ions, ozone and OH radical produced in the corona space. In order to get the fundamental data of the corona discharge over the water surface, positive and negative V-I characteristics and the ozone production were measured with the multi needle and the saw-edge type of the discharge electrodes. The pulse corona characteristics were also measured with some different waveforms of the applied pulse voltage. The experiments were carried out under the atmospheric pressure and room temperature. Both DC and the pulse corona to the water surface showed the stable V-I characteristics though the surface of water was waved by the corona wind. The positive streamer corona showed the more ozone production than the negative one both in the DC and in the pulse corona. Some dust and NOx treatment tests by the model corona reactor were carried out with diesel engine exhaust gas. The corona discharge to the water surface was confirmed to induce the better conditions for the proceeding of the NO oxidation and the NO_2 dissolution into water in the NOx removal processes as well as dust catching.