Combustion and Performance Study of Low-Displacement Compression Ignition Engines Operating with Diesel–Biodiesel Blends

Guillermo Valencia Ochoa,Carlos Acevedo Peñaloza,Jorge Duarte Forero

doi:10.3390/app10030907

Guillermo Valencia Ochoa, Carlos Acevedo Peñaloza + Show 1 more

Open Access

https://doi.org/10.3390/app10030907

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Abstract

This study investigated the influence of different biodiesel blends produced from residual sunflower oil and palm oil from agroindustry liquid waste on the characteristics of the combustion process, performance, and emissions in a single-cylinder diesel engine. For the analysis of the combustion process, a diagnostic model was developed based on the cylinder pressure signal, which allows the calculation of the heat release rate, the accumulated heat rate, and the temperature in the combustion chamber. This is to assess the influence of these parameters on engine emissions. The experiments on the diesel engine were carried out using five types of fuel: conventional diesel, two biodiesel blends of residual palm oil (PB5 and PB10), and two biodiesel blends formed with palm oil and sunflower oil residues (PB5SB5 and PB10SB5). The engine was running in four different modes, which covered its entire operating area. Experimental results show that the in-cylinder pressure curves decrease as the percentage of biodiesel in the fuel increases. Similarly, the results showed a decrease in the heat release rate for biodiesel blends. The diagrams of the accumulated heat release curves were larger for fuels with higher biodiesel content. This effect is reflected in the thermal efficiency of biodiesel blends since the maximum thermal efficiencies were 29.4%, 30%, 30.6%, 31.2%, and 31.8% for PB10SB5, PB5SB5, PB10, PB5, and diesel, respectively. The emission analysis showed that the blends of biodiesel PB5SB5 and PB10SB allowed a greater reduction in the emissions of CO, CO2, HC, and opacity of smoke in all the modes of operation tested, in comparison with the blends of biodiesel PB5 and PB10. However, NOx emissions increased. In general, biodiesel with the percentage of residual sunflower oil does not cause a significant change in the combustion process and engine performance, when compared to biodiesel that includes only residual palm oil.

Highlights

The industrial growth and modernization of the world have progressively caused the depletion of fossil resources and serious environmental problems, which has led to a global interest in the search for alternative fuels that can be used in diesel engines
In the study,combustion an analysis ofinside the combustion process, performance, andfact, emissions of a with the fuel, which producespresent complete the chamber. Due to this biodiesel single-cylinder engine was carried out, using biodiesel blends formed by the blend of palm oil and percentage of sunflower oil has the lowest HC emissions, since its oxygen content is higher compared sunflower oil residues
The results of the diagnostic model show that the pressure curves in the cylinder chamber decrease as the biodiesel content in the fuel increases

Summary

Introduction

The industrial growth and modernization of the world have progressively caused the depletion of fossil resources and serious environmental problems, which has led to a global interest in the search for alternative fuels that can be used in diesel engines. These new fuels must be characterized by coming from renewable resources, minimizing environmental impact, and being economically viable [1,2]. Other advantages of using biodiesel are its lower sulfur and aromatic content, and higher flash point compared to diesel.

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