Diesel emission control system using combined process of nonthermal plasma and exhaust gas components' recirculation

A NO x aftertreatment system, using nonthermal plasma (NTP) reduction and exhaust gas components' recirculation, is investigated. A pilot-scale system is applied to a stationary diesel engine. In this system, NO x is first removed by adsorption, and subsequently, the adsorbent is regenerated by thermal desorption. NO x desorbed is reduced by using nitrogen NTP. Moreover, NO x , CO 2, and water vapor recirculated into the engine intake reduce NO x . In this study, approximately 57% of the NO x of the exhaust (NO x : 240–325 ppm, flow rate = 300 NL/min) can be continuously treated for 58 h. A system energy efficiency of 120 g (NO 2)/kWh is obtained.