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The lower energy content (of both FAME biodiesels and ethanol) cannot be altered; however, the amount of injected fuels in each cycle can be increased by redesigning and presetting an engine so that load specification is satisfied. Biofuels: Policies, Standards and Technologies World Energy Council 2010 41 HC emissions (especially acetaldehyde, formaldehyde, methane, ethylene and acetone) that occur due to the oxidation of ethanol-related fuel can probably be reduced by lean combustion, which can be generated with either air enrichment or EGR dilution.

Biofuels: Policies, Standards and Technologies World Energy Council 2010 32 3. Production and EndUse Technologies General Aspects Biofuels development has different drivers: the need to diversify energy mix, mandatory requirement for blending with conventional fuels, government support for the production, use and marketing of biofuels, legal frameworks and agricultural policies, just to name a few. In order to identify the most critical issues for the sustainable production of biofuels around the world, certain criteria should be taken into account.

Secondly, high solubility of biodiesel could cause fuel system encumbrance especially Biofuels: Policies, Standards and Technologies World Energy Council 2010 44 when used in an engine normally operated with regular diesel fuels. During the use of the regular diesel fuels, deposits accumulate in the fuel tank. Addition of biodiesel loosens these deposits and re-introduces them into the fuel stream. High cloud point and pour point temperatures of biodiesel reduce thermal stability and limit the cold weather operability of both pure biodiesels and blends.

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