Abstract

Preheated Schizochytrium sp. raw microalgae oil (MAO) was evaluated as a fuel in a single-cylinder four-stroke diesel engine to produce a comparative study of MAO and diesel oil (DO) critical parameters. In particular, brake power, brake specific fuel consumption (BSFC), brake thermal efficiency (BTE), in-cylinder pressure (CP), exhaust gas temperature (EGT), both nitrogen oxides (NOx) and carbon monoxide (CO) emissions were investigated. Additionally, an engine durability test for longevity was undertaken over a 30-h period, using raw MAO as the fuel. The study demonstrated that the preheated MAO could be successfully used in a diesel engine smoothly. The use of MAO reduced the engine brake power by 26% and increased brake-specific fuel consumption by 20%. The most significant finding from this research study is that there was a significant reduction in NOx and CO emission by 42% and 60% when using raw MAO, respectively. Therefore, these findings demonstrate that algae oil is a highly credible fuel for use in diesel engines and offers a promising solution to diesel engine emissions.

Highlights

  • Energy consumption is a key driver of economic development and, is a pivotal societal global issue

  • Crucial parameters including brake power (BP), brake specific fuel consumption (BSFC), brake thermal efficiency (BTE), in-cylinder pressure (ICP), exhaust gas temperature (EGT), nitrogen oxides (NOx) and carbon monoxide (CO) were investigated and analysed so that an assessment of performance and emissions characteristics could be made when microalgae oil (MAO) was utilised in a diesel engine

  • A reduction in brake power of up to 25% was observed, which is caused by the lower heating value, higher density and viscosity of the MAO

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Summary

Introduction

Energy consumption is a key driver of economic development and, is a pivotal societal global issue. Different species of microalgae are available, and each has specific characteristics associated with biomass productivity, oil yield and biodiesel productivity [7,8] Another important feature of MAO is that it offers additional economic value through co-products such as proteins or residual biomass after extraction of the oil. The volume of published material on topics such as the performance and emissions of diesel engines using raw MAO is extremely limited compared to literature associated with microalgae culture, oil extraction and biodiesel production. The results demonstrate that the blend closest to DO is B20 [10] Whilst biodiesel offers both improved performance and lower emissions, the potential to use MAO as an SVO must be considered due to the simplicity of MAO production. This research paper intends to investigate the performance, emissions and durability of a diesel engine fuelled with raw MAO, without the chemical additives

Engine Setup and Test Procedure
Error Analysis
Results and Discussion
Durability Test
Conclusions
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