NOx Reduction in Diesel Engine Emission Using Adsorption Followed by Nonthermal Plasma Process (Performances of Three Types of Plasma Reactors)

The NOx reduction performance of three types of nonthermal plasma (NTP) reactors is compared. An experiment using simulated gas is first conducted. Subsequently, those reactors are applied to a NOx aftertreatment system for a stationary diesel engine. Twelve surface discharge elements are placed in a different arrangement in each of those reactors. The results show a possibility that NOx reduction performance depends on the gas flow surrounding the elements. The reactor with the best arrangement shows a NOx reduction energy efficiency of 19.4 g (NO2)/kWh. The application of one of those reactors to the NOx aftertreatment system indicates that NOx reduction performance is not deteriorated by CO2. The aftertreatment system shows more than 50% NOx removal efficiency for at least 8 h with a system energy efficiency of 15.4 g (NO2)/kWh.