Experimental study for hydrogen assisted system for diesel engine for the reduction of exhaust pollutions

Abstract

2 A. V,Luikov Heat and Mass Tmnsfer Institute Nationd Academy of Sciences of Belarus 15 P. Brovka Str., Minsk, 220072, Republic of BelarusInteraction between non-thermal Plasmas and flames has been experimentally investigated. Diffusion flames and dielectric barrier discharges (DBD) with a wire-cylinder type were considered. A burner consisted of round type fuel nozzle andIn this study, a new plasma system is introduced to genconcentric coflow confinement. Since the burner was used as eration of rich gas for diesel aftertreatment and other applia plasma reactor at the same time, it was made of quartz cations. tube. Along the centerline of the burner, stainless steel wireThe designed plasma,system allows to reform diesel fuel of 1 mm diameter was protruded as a high voltage electrode. into hydrogen rich gas (Hz + CO). Plasma boosts par-Firstly, the effects of flames on electric dscharges were in-tial oxidation reaction that reforms hydrocarbon fuels into vestigated in terms of discharge onset voltages and delivered hydrogen-rich gas partial oxidation (at. oxygen/carbon ratio powers to the reactor. As results, vigorous streamers were oh-= 1, exothermic reaction): served along with a flame owing to the elevated temperature. As a gas temperature increases gas density decreases simul-CnHm + n/2 0 2 = n CO + m/2 Hz -(10-15)% of energy taneously, which resulted in an increasing reduced electrical released. field (=E/n). The seeding of free electrons and ions generated by the flame also could affect to the enhanced plasma condi-Of non-equilibrium Plasma was used low curtions. k O n d l y , the effects of on flame behaviors rent a plismatron with convective cooling of electrodes. The were investigated. Flame lengths were significantly shortened Power Of a Plasma generator were Used: DC Power as the applied voltage increased owing to the effect of intense suPPIY (looo v, 1000 w, and Pulse generator (15000 kV, 1000 mixing by the ionic wind and the electrically induced flow w). Were gauged temperature of gas in a zone of dixhW% of soot. The yellow luminosity of a diffusion flame from the consumed power and structure of products of reforming. radation of soot were also significantly reduced with increas-The outcomes of experiments allow to h a w a conclusion ing applied -voltages, which can be resulted from the reduc-ahout high performance of a designed plasma system. Potention of soot or decreasing flame temperature. T~ the tial exhaust aftertreatment applications: NO, absorber catdominant mechanism, we measured the temperature of burnt alyst regeneration, HC SCR aftertreatment, operation of DE gases, the concentration of major species, and the spatial dis-on air-fuel mixture with hydrogen admixture. tribution of OH radical, PAH (Poly-Aromatic Hydrocarbons), and soot. Flame temperatures and the concentration of major species measured by thermocouple and ETIR (Fourier Transform Infrared Spectrometer), respectively, were not changed with the plasma generation, which demonstrates that overall chemistries of combustion are not a...