Modified selective non-catalytic reduction system to reduce NOx gas emission in biodiesel powered engines

Biodiesel fuels releases higher NOx emissions than fossil diesel. The Selective Catalytic Reduction (SCR) technique used in the OEM industry is not suitable for application small engines due to back pressure and clogging problems. Non-Catalytic (SNCR) relatively large combustion operations. This study introduces a new design by combining SCR SNCR systems, use low power density diesel engines. system composed of injection-expansion pipe swirl chamber. working principle maximum mixing injected fluid exhaust gas expansion chamber, then creating turbulence way emission can be reduced at lower temperatures without using any catalyst. CFD models three candidates were examined terms velocity magnitudes, intensity particle residence time. selected was manufactured tested. Distilled water urea-water solution separately same flow rate 375 ml/min. Exhaust diesel, sheep fat biodiesel – waste cooking oil blend chicken cottonseed No significant changes CO2 HC gases observed. injection CO NO about 10% 6% diesel; 9% 7% biodiesels operation respectively. led reductions 60% 13% 45% 15%