NOx Emission Reduction in Diesel Engine Through Developed Cooled EGR Setup

In the present research work, an experimental investigation is performed on single-cylinder air-cooled direct injection diesel engine by incorporating cooled EGR into the intake manifold for reducing NOx emission. A surge tank is designed, fabricated, and utilized for the flow of cooled EGR into the intake manifold as it dampens the fluctuations caused by exhaust gases during engine running. A 20% blend of karanja biodiesel and diesel fuel B20 is utilized for the experimental investigation. The combined effect of varying the percentage of cooled EGR and karanja B20 biodiesel fuel on engine performance and emission characteristics such as brake thermal efficiency, brake specific fuel consumption, cylinder pressure, and exhaust emission has been investigated. From the results, it has been concluded that at 100% of engine load, the NOx emission reduced substantially from 662 to 503 ppm with 15% of EGR. Also for all operating conditions, a better trade-off between HC, CO, and NOx emissions is attained within a limited EGR rate of 5–15% with a little economy penalty.