In order to remove NO from diesel exhaust gas, non-thermal plasma methods have been expected so far. However it is known that one of the problems is a relatively large energy consumption of the De-NOx process. In this paper, we tried to solve this problem by using a combination method of exhaust gas recirculation and ozone injection. Using a 2.4kVA diesel engine generator, we investigated that how effective is the exhaust gas recirculation to reduce the NO concentration. NO removal experiments were carried out using ozone injecttion method, and a great reduction of discharge energy of De-NOx was confirmed. The optimal recirculation rate was discussed by evaluating the total energy consumption, and we obtained a conclusion that optimal recirculation rate is about 10%.
SUMMARYTo improve the NO removal performance in silent discharge process, we investigated the influence of physical parameters such as current density, channel radius, and pulse duration of one micro-discharge under a constant reduced electric field strength. The influence of micro-discharge occurrence locations was also discussed. In order to analyze the NO removal process, we assumed that the pulse micro-discharges occur repeatedly at the same location in static gas and that the chemical reactions induced by microdischarge form many radicals, which react with pollutants and by-products. The conclusions we obtained are that lower current density, smaller discharge radius, and shorter discharge duration improve NO removal efficiency. These results also mean that the lower discharge energy of one micro-discharge and the larger number of parallel microdischarges increase the NO removal performance. Therefore, making the area of one micro-discharge small is a desirable way to improve the NO removal performance. Thus, we think that the glow-like discharge might be more effective than the streamer-like discharge mode. Next, using the two-dimensional model, which considered the influence of gas flow, we found that the repeated micro-discharges at
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.