Effect of EGR System on Emission Characteristics of Compression Ignition Engine with Cottonseed Oil and Its Blends

Nowadays, the main focus on renewable energy and different fuels has increased because of increasing oil costs, environment pollution, and additionally concern on protective the nature. Biodiesel is non-toxic, biodegradable, high Lubrication ability, extremely renewable, and its use thus produces real reduction in petroleum consumption and carbon dioxide (CO2) emissions. Though biodiesel has several benefits, however it still has some properties got to improve, like lower calorific value, lower effective engine power, higher emission of N oxides (NOX) and maximum sensitivity to low temperature. An effort has been taken to review performance and emission characteristics of a CI engine fueled with biodiesel and diesel fuel using EGR. All the experiments were conducted on a single-cylinder, four-stroke, water cooled, indirect injection CI engine at the engine full load operation and constant engine speed of 1500 rpm. The engine performance and efficiency obtained in biodiesel case were less that can be attributed to lower calorific value of biodiesel. CO and UHC emissions for biodiesel were not up to that of diesel fuel. However, it absolutely was observed that Nox emissions for biodiesel were on top of that of diesel fuel. Exhaust gas recirculation (EGR) may be a terribly effective technique to reduce Nox emissions from a CI engine. In this study the venturi type EGR system was used. Exhaust gas recirculation (EGR) is effective technique to minimize Nox emission from diesel engines as a result of it permits lower flame temperature and oxygen concentration within the combustion chamber. Some studies succeeded to minimize the Nox emission from biodiesel by EGR however they discovered increasing soot emission. Soot emission, NOX, CO2, carbon monoxide (CO) were recorded and various engine performance parameters were also evaluated.