The Ergosphere
Sunday, August 01, 2010
 

Analysis from posts

GCC has a post on biomass-to-naptha schemes, upgrading pyrolysis oil to hydrocarbons.  The projected cost is $2.11-$3.09 per gallon.  My analysis follows.

2000 dry tons/day = 730,000 tons/year.  The yield is 48 gallons/ton for the hydrogen production scenario and 79 gallons/ton for the merchant hydrogen scenario.  (I calculate the carbon fraction captured in the product to be about 26% and 47%, respectively.  This is not a very efficient scheme.)

If we take the figure of the 446 million dry tons of crop residues as a given, the potential output from this process is 21 billion gallons/year in the hydrogen-production scenario and 35 billion gallons/year in the purchased hydrogen scenario.  (The question of the provenance of purchased hydrogen is significant.)

Even if the biomass supply can be doubled (or tripled), this scheme still falls short of providing BAU supplies of motor fuel.  It can supply the liquid fuel needs of the PHEV component of an electrified fleet.

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