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The Role of Alcohol Additives for Thermal Cracked Cashew Nut Shell Liquid Fuel in Direct Injection Diesel Engine
(*) Corresponding author
DOI: https://doi.org/10.15866/ireme.v8i5.3769
Abstract
Depleting petroleum reserves, rising petroleum prices, threat to the environment from exhaust emissions and global warming create an intensive international interest in developing alternate and renewable fuels for engines. The use of biodiesel is seriously considered as an alternative fuel. But the problems with biodiesel are higher viscosity and lower volatility resulting in incomplete combustion and hence higher exhaust emission levels. The addition of alcohol with biofuel will increase the combustion efficiency and hence reduce the engine exhaust emission levels. In this study, the thermal cracked cashew nut shell liquid (TC-CNSL) is blended with ethanol, isobutanol,n-butanol, and tert-butanol separately, each with the volume percentage of 5%, 10%, 15% and 20%, respectively. Single cylinder, direct injection, water cooled 1500 RPM diesel engine was used for this study. The engine was run at full load with various percentages of above said alcohols. The performance and emissions of the different percentage of alcohol with TC (CNSL) are compared. It is observed that the brake thermal efficiency (BTE) is improved with the use of TC (CNSL)alcohol additive compared to those of neat TC (CNSL) oil. Carbon monoxide (CO) and hydrocarbon (HC) emissions with TC (CNSL)alcohol additives are observed to be lower compared to those of neat TC (CNSL) oil at higher loads. The NOx emission is slightly lower with TC (CNSL)–alcohol additives. But the low pressure rise and heat release are higher for neat TC (CNSL) as compared to TC (CNSL)-alcohol additives.
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