Experimental Study on NO_x Reduction in CI Engine Fuelled with Biodiesel (Cotton Seed Methyl Ester Blends) Using Selective Catalytic Reduction (SCR) System with Anova Analysis

Abstract

An experimental investigation was conducted to analyse the performance and exhaust emissions of Kirloskar AV-I Compression ignited air cooled engine fuelled with diesel and cotton seed oil blends (80% of diesel and 20% of cotton seed biodiesel).Experiments were conducted at various concentration of urea solutions ranging from 30 to 35% at a constant flow rate of 0.75 litres per hour. The results indicated that urea injection with titanium dioxide as selective catalyst in the exhaust pipe caused a 47.9% of NOx reduction for diesel at full load condition and at a constant flow rate of 0.75lit/hr with an urea concentration of 35%.Also the results showed that urea injection with titanium dioxide as selective catalyst in the exhaust pipe caused a 68.5% NOx reduction for biodiesel which was achieved with a constant flow rate of 0.75lit/h with an urea concentration of 32.5%.Thus Biodiesel (C20) fuelled CI Engine with SCR is a very effective and suitable replacement for petroleum based diesel fuelled CI Engine with SCR. ANOVA analysis was done and resulted that the null hypothesis is rejected. A high p-value (0.104) had suggested that beta plays a less significant role in the model and a low p-value (0.012) suggests that beta plays a significant role in the model. Overall ANOVA analysis disclosed that percentage of urea solution has a major impact on NOX emissions than HC and CO emissions.