The Effects of Injection Timing on the Production of NOx Emissions during Biodiesel Combustion

Allard, Anthony (2013). The Effects of Injection Timing on the Production of NOx Emissions during Biodiesel Combustion Honours Thesis, School of Engineering, The University of Queensland.

       
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Author Allard, Anthony
Thesis Title The Effects of Injection Timing on the Production of NOx Emissions during Biodiesel Combustion
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2013
Thesis type Honours Thesis
Supervisor B. Feng
Total pages 79
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
Biodiesel is a promising alternative to traditional petroleum-based diesel fuel which can reduce our reliance on finite fossil fuels, reduce pollution and be beneficial to our economy. However a number of current studies have shown that the physical properties of biodiesel result in an advanced fuel injection timing causing an increase of NO and NO2 (NOx) emissions compared to petroleum-based diesel. This is a significant concern as these emissions contribute to acid rain and photochemical smog and must be addressed for biodiesel to become a viable and widely accepted alternative.

The aim of this thesis is to improve the usage of biodiesel fuels by reducing the amount of harmful NOx emissions formed during its combustion. This is achieved through analysing the effects of altering the fuel injection timing on the production of NOx emissions during the combustion of biodiesel in diesel engines. The effects of injection timing on other diesel engine emissions and performance parameters are also analysed to develop a balanced injection timing solution.

The effects of injection timing on NOx emissions as well as other diesel engine emissions and performance parameters have been investigated through a review of previous experimental studies. Data from 20 experimental studies was collected and compiled into a single data set for analysis. Whilst the broad scope of the data allows for the effects of many different factors to be assessed, the main consideration for this study was the change in injection timing (advanced or retarded) from the original injection timing as specified by the manufacturer of the engine.

This study found that retarding the injection timing of a diesel engine can reduce the production of NOx emissions to levels lower than those produced by petroleum-based diesel. Whilst this retardation of the injection timing causes increases in emissions of HC and CO, the level of these emissions remains lower than those produced by petroleum-based diesel. However, diesel engines are not as efficient when the injection timing is retarded. These findings add further support to the current understanding that NOx emissions can be reduced by retarding the injection timing of a diesel engine when operating on biodiesel fuel. Further investigation must be conducted to improve the reliability of these findings as well as to improve the use of biodiesel as an alternative fuel to traditional petroleum-based diesel.

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Fri, 08 May 2015, 14:43:13 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service