Green Fuels Ltd.

A Biodiesel Filled Future For Your Car - case study


Courtesy of Green Fuels Ltd.

Future vehicles require a level of robustness to the legislated future introduction of bio-diesel. This research aims to understand the future of biodiesels in world markets and the characteristics of these fuels.

The Need

In recognising that sustainable sources of biodiesel will be dependant upon the particular local circumstances where the raw naterial is sourced, the engine manufacturer will need to ensure that the engine can operate within it's design and market expectation parameters irrespective of the material used to produce the legislated fuel. Sustainability is the prime consideration in local markets and selection of a particular material is influenced by the climate, soil conditions, established crops and socio-economic conditions. Although these fuels will be produced in compliance with the relevant local standards of vhich European and US standards predominate, the biodiesel product will inevitably be produced from an unpredictable /ariety of materials.


The project has enabled the behaviour of specific bio-diesel fuel streams to be studied in detail not available to a single organisation. By pooling resources and working to company strengths valuable insights have been obtained as to their affects on engines . The results obtained will allow fuel formulators to produce better fuel products throughout the world which will both meet the new fuels legislation requirements and match expectations of vehicle manufactures and general motorists.

Jaguar Land Rover with Johnson Matthey have established some correlation between the variation of source materials with combustion performance and emissions. It has also enabled Shell to identify the blending and materials control requirements for such fuels.

It is generally reassuring that as Green Fuels is a world wide equipment supplier whose customers have complete choice of raw material to produce to the required standard that the fuel they produce can be used successfully and reliably in vehicles.

Combustion and emissions characteristics of different fuel blend ratios (B10, B30 and B60)from different biodiesel feed stocks were investigated at a variation of steady state engine test conditions on the latest 3.0I V6 diesel engine. The objective was to understand the effect of different biodiesel feedstock on the engine performance and emissions. These results are useful in the development of future engines which need to be robust to a variation of fuel availability on the market.

The experimental results show that all blended fuels have similar combustion characteristics and lower engine out emissions (Hydrocarbons, Carbon Dioxide and Smoke) as compared to mineral diesel,   with some of the blended fuels resulting in higher Nitrogen Oxide (NOx) emissions. The formation of NOx is influenced by the physical and chemical composition property of the blended fuels. Combustion analysis showed that blended fuels produced a higher peak in-cylinder pressure, higher in-cylinder temperature and an advanced heat release profile. The combination of higher oxygen content, higher cetane number and higher viscosity promote the advanced combustion in blended fuels. Due to the biodiesels lower calorific value per unit volume, the blended fuels result in higher fuel consumption.

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