Tuesday, Jun 07, 2016 at 22:34
Actually, vegetable oils make up to 30% of the volume in biodiesel fuel used in sizable numbers of diesel-powered vehicles in Europe - with most larger cities transport fleets nearly all running on high percentage vegetable oil, biodiesel.
The major sources of the oils used for biodiesel in Europe are rapeseed oil, palm oil, soybean oil, waste cooking oils, and waste animal fats.
Rapeseed oil is by far the biggest constituent of the oils produced for biodiesel.
The Europeans wanted to go to even higher levels of vegetable oils in biodiesel - but they are torn between using oil for fuel, or for food - and torn between reducing greenhouse gases or feeding people.
In Europe, the rapeseed oil producers were selling so much rapeseed oil for biodiesel use, that the margarine manufacturers started complaining that they couldn't get enough rapeseed oil for margarine production.
The EU Parliament has decreed that the upper vegetable or organic oil limit for all transport biodiesel sold in EU nations, is 7% vegetable or organic oils.
They wanted to go higher (France wanted 10% vegetable oil), but the EU Parliament was deeply concerned at the effect of recent droughts in cropping areas, and the need to place food production as a priority against biodiesel.
There was such concern about the food conflict situation, some German politicians called for the use of vegetable oils in biodiesel, to be banned.
So it is not actually whether that biodiesel is good for diesel engines - it is in fact, beneficial to diesel engines, and beneficial from the exhaust pollution angle - but it is detrimental to the food production supply line, to start using large quantities of vegetable oil for fuel.
In the following link is a
test report covering the use of biodiesel at a mix of 50% vegetable oil (rapeseed) and diesel, over a period of 12 years - in a fleet of heavy prime movers, plus several light commercial vehicles.
Test report - 50% vegetable oil biodiesel
The prime movers were older style, indirect injection engines, and the light commercials were all Common Rail diesels.
Some of the engines did over 500,000kms during the
test period on the 50/50 biodiesel mix.
The summary concludes that the engines suffered no ill-effects from the fuel and in fact benefited from a reduction in carbon levels within the engines.
There were engine failures, but none that could be attributed to the biodiesel.
Test Report Abbreviations KEY:
RME = Rapeseed Methyl Ester
LHV = Lower Heating Value (a calorific measurement)
Cheers, Ron.
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