CORONA TREATMENT FOR NO_X REDUCTION FROM STATIONARY DIESEL ENGINE EXHAUST IMPACT OF NATURE OF ENERGIZATION AND EXHAUST COMPOSITION

摘要

A detailed study on the removal of oxides of nitrogen (NO_x) from the exhaust of a stationary diesel engine was carried out using non-thermal plasma (dielectric barrier discharge) process. The objective of the study was to explore the effect of different voltage energizations and exhaust composition on the NO_x removal process. Three types of voltage energizations, namely AC, DC and Pulse were examined. Due to the ease of generation of high voltage AC/DC electrical discharges from automobile/Vehicular battery supply for possible retrofitting in exhaust cleaning circuit, it was found relevant to investigate individual energisation cases in detail for NO_x removal. AC and Pulse energisations exhibit a superior NO_x removal efficiency compared to DC energisation. However, Pulse energisation is found to be more energy efficient. Experiments were further carried out with filtered/unfiltered (raw) exhaust under pulse energisations. The results were discussed with regard to NO_x removal, energy consumption and formation of by-products.