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In our previous studies, a novel NOx aftertreatment system using adsorption and reduction by nonthermal plasma desorption is proposed. In the present study, application of the system to a real stationary diesel engine generator is investigated. The NOx is first removed by adsorption, then the adsorbent is regenerated by thermal desorption using waste heat of the exhaust gas. In the regeneration process, hot exhaust gas passes through the heat exchanger tubes surrounded by the adsorbent pellets. The desorbed NOx is subsequently reduced to N2 by nitrogen nonthermal plasma. This system reduces 245 ∼ 270 ppm NOx emitted by the generator to around 50% for 8 hours.

A direct incineration or regeneration of DPF with collected PM was investigated using atmospheric pressure nonthermal plasma which was induced inside DPF. The method is to use the NO2 and radicals induced by the plasma to burn carbon soots deposited on DPF. Conversion of NO to NO2 was evaluated using three types of DPF honeycomb plasma reactors. Then, the regeneration experiment was carried out using a DPF honeycomb plasma reactor. As a result, it was confirmed that the pressure drop decreased when the plasma was turned on and the regeneration of DPF was confirmed at the low temperature of 200°C.