Performance of Low Heat Rejection Diesel Engine Operated with Mahua and Jatropha Bio- Diesels under Selective Catalytic Reduction Technique for NOx Reduction

The present study focuses on the significance of thermal barrier coated piston on the performance of diesel engine and also the emission characteristics. The test engine piston was covered with a NiCrAlY bond coat of 50 µm thick and a top coat of 250 µm thick with a mixture of 93% of ZrO2, 3 % of Y2O3, 2 % of Gd2O3 and 2% Nd2O3 which is coated onto the target surface by following the plasma spray technique. The experimentation was conducted in a 4-stroke 1-cylinder diesel engine using diesel, mahua (MB 100) and Jatropha (JB 100) fuels with and without coating. The selective catalytic reduction (SCR) technique was adopted for the present study to reduce NOx emissions. The outcomes obtained from this analysis show that the brake thermal efficiency (BTE) of a coated engine got increased by 11% and the brake specific fuel consumption (BSFC) was reduced by 12 % with a coated piston compared to the standard piston. In coated engines with SCR, the hydrocarbon (HC) and carbon monoxide (CO) emissions got reduced by 20.1% and 13.4% respectively though the oxide of nitrogen (NOx) emission was reduced by 39.1% compared to the without coated engine.