Design og modellering af metanolanlæg til VEnzin-visionen Bilag

NYKOMB
SYNERGETICS
Ecotraffic R&D AB
Alcohols used to produce stable emulsions in diesel oil need not be water-free
but may contain a few percent water, for instance the ethanol/water azeotrope
or crude methanol. However, blended fuels must be standardised on energy
content.
11. Life Cycle Analysis Considerations
It is quite obvious from reported studies that both methanol and ethanol can be
produced by conversion from wood with use of almost only renewable energy,
i.e., fuels used are by-products or part of the biomass feedstock.
Energy usage in other steps in the chain from feedstock production to end use
in vehicles (forestry, agriculture, transports) is today mainly based on fossil
resources. In the whole chain about ten times as much transport fuel energy in
form of methanol or ethanol can be obtained for each unit input of fossil energy
in a properly designed system.
This ratio can be considerably lower when fossil auxiliary fuels and electricity
are used. Such systems should not be accepted other than during transitions to
fully renewable systems.
Nykomb Synergetics AB 15 April 1999 7