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The present experimental work investigates the use of ethyne gas in biodiesel-fueled diesel engine at different flow rate of 1, 2, and 3 L/min and is compared with diesel operation. This work is aimed to examine the outcome of ethyne gas by dual-fuel operation on emission characteristics of neat biodiesel-fueled stationary diesel engine. The oil derived from mustard seeds are employed as a source for biodiesel. The work was carried out at 2100 rpm (speed) and at an optimal compression ratio of 17. Based on the outcome of this investigation, the maximum reduction in hydrocarbon (25.1%), carbon monoxide (17.24%), and smoke emission (24.8%) was observed for biodiesel-ethyne at 3 L/min than the neat biodiesel. However, NOx emissions were found to be 15.8% higher for ethyne-biodiesel fueling at 3 L/min owing to increase in combustion gas temperature than neat biodiesel. [ABSTRACT FROM AUTHOR]

This work investigates the effect of urea injection parameters on the reduction of NOxemissions from a 4-stroke twin-cylinder diesel engine fueled with neat biodiesel. The test plan was designed by employing L9(34) Taguchi orthogonal array. It has been experimentally found that the concentration of urea, the flow rate of urea and increase in spray angle has a significant effect on reducing in NOxemissions of the diesel engine when fuelled with neat biodiesel. Further, ANOVA results reveal that the concentration and flow rate of urea are the major parameters in reducing NOxemissions whereas, mixing length and spray angle have minimal effect on reduction in NOxemissions. Since the predicted value derived from Taguchi technique is in accordance with the test results from the confirmation test, the predictive capability of this technique in the study shall be inferred. [ABSTRACT FROM PUBLISHER]

In this study, neat biodiesel with octanol additive was employed in a diesel engine and its effects on engine emission were studied. The five fuels evaluated were neat palm kernal oil biodiesel, octanol blended with biodiesel by 10%, 20%, and 30% volume, and diesel. All the emissions are reduced by the addition of octanol in biodiesel in all loads owing to the higher oxygen concentration of air/fuel mixtures and improved atomization. Hence, it is concluded that the neat biodiesel and octanol blends can be employed as an alternative fuel for existing unmodified diesel engines owing to its lesser emission characteristics. [ABSTRACT FROM PUBLISHER]

This study examines the prospect of utilizing biodiesel from non-edible, waste seed derived from grapefruit. The prepared biodiesel was intended to replace the diesel fuel in a research diesel engine. Two antioxidants namely BHA (Butylated Hydroxyanisole) and BHT (Butylated Hydroxytoluene) are partially blended to enhance the ignition patterns of diesel/biodiesel blends. 30% volume of grape-seed biodiesel (BD) is blended with 70% volume of diesel and identified as base fuel. 10% volume of two antioxidants is equally blended to base fuel to enhance its physic-chemical properties. Upon blending the antioxidants, no change in phase was observed for base fuel. Performance results found that BHA and BHT addition lowered 1.2–1.4% of BSFC, and improved 0.7–1.1% of BTE of diesel/biodiesel blends respectively. Besides, BHA and BHT inclusion improved the physio-chemical properties of diesel/biodiesel blends and produced a prominent increase in In-Cylinder Pressure (ICP) and heat release rate (HRR). Emissions results revealed that BHA and BHT addition lowered 1.8–2.1%% of CO, 2.2–2.6% of HC of diesel/biodiesel blends. Further, a higher cetane number of BHA and BHT improved the combustion and lowered smoke (2.9–3.4%) and NO (1.9–3.7%) emission for diesel/biodiesel blends. [ABSTRACT FROM AUTHOR]

The objective of this work is to boost the performance characteristics, and to reduce emissions from neem biodiesel (BD100), and to explore the option of direct use of neat BD100 in a diesel engine. The biodiesel concentrations were maintained at 90 and 80% where the volumes of decanol were 10, 20%. This work revealed that the increase in decanol concentration was followed by the reduction in fuel consumption (0.9%) as well as the enhancement in thermal efficiency (0.5%) inside the engine. Smoke (3.2%), HC (2.4%) and CO (4.8%) level reduced with a consequence of minor higher NO X (4.3%) emissions than diesel. Additionally, Combustion front such as Heat release rate (HRR) and the peak pressure increased with decanol content for neem biodiesel. This study discloses that 80% of neem biodiesel and 20% of Decanol can enhance the diesel engine combustion, performance and emissions with no alterations. [ABSTRACT FROM AUTHOR]