Influence of Fuel Injection Pressure on the Emissions Characteristics and Engine Performance in a CRDI Diesel Engine Fueled with Palm Biodiesel Blends

Sam Ki Yoon,Nag Jung Choi,Jun Cong Ge

doi:10.3390/en12203837

Abstract

This experiment investigates the combustion and emissions characteristics of a common rail direct injection (CRDI) diesel engine using various blends of pure diesel fuel and palm biodiesel. Fuel injection pressures of 45 and 65 MPa were investigated under engine loads of 50 and 100 Nm. The fuels studied herein were pure diesel fuel 100 vol.% with 0 vol.% of palm biodiesel (PBD0), pure diesel fuel 80 vol.% blended with 20 vol.% of palm biodiesel (PBD20), and pure diesel fuel 50 vol.% blended with 50 vol.% of palm biodiesel (PBD50). As the fuel injection pressure increased from 45 to 65 MPa under all engine loads, the combustion pressure and heat release rate also increased. The indicated mean effective pressure (IMEP) increased with an increase of the fuel injection pressure. In addition, for 50 Nm of the engine load, an increase to the fuel injection pressure resulted in a reduction of the brake specific fuel consumption (BSFC) by an average of 2.43%. In comparison, for an engine load of 100 Nm, an increase in the fuel injection pressure decreased BSFC by an average of 0.8%. Hydrocarbon (HC) and particulate matter (PM) decreased as fuel pressure increased, independent of the engine load. Increasing fuel injection pressure for 50 Nm engine load using PBD0, PBD20 and PBD50 decreased carbon monoxide (CO) emissions. When the fuel injection pressure was increased from 45 MPa to 65 MPa, oxides of nitrogen (NOx) emissions were increased for both engine loads. For a given fuel injection pressure, NOx emissions increased slightly as the biodiesel content in the fuel blend increased.

Highlights

Modern countries consume a lot of energy due to rapid population growth and complex and diverse industrial development
As seen in the figure, when the engine load was held constant at 50 Nm and the fuel injection pressure was increased from 45 to 65 MPa, the combustion pressure increased by 9.6, 9.6, and 10.4% for PBD0, PBD20, and PBD50, respectively
Keeping the engine load constant at 100 Nm and increasing the fuel injection pressure from 45 MPa to 65 MPa resulted in an increase in combustion pressure by 12.1, 13.5 and 13% for PBD0, PBD20 and PBD50, respectively

Summary

Introduction

Modern countries consume a lot of energy due to rapid population growth and complex and diverse industrial development. The use of fossil fuels is known to cause problems such as global warming, climate change, pollution of the atmospheric environment and depletion of fossil fuels [1] Such usage can be detrimental to human health. Among the emissions from diesel engines, known as exhaust gas, that harm humans are hydrocarbons (HC), carbon monoxide (CO), particulate matter (PM) and oxides of nitrogen (NOx) [2]. For this reason, many researchers are working to study the use of biodiesel fuels [3,4,5].

Methods

Results

Conclusion