Hi Mark, You ask: > After gasification, approximately 5% of the woody biomass remains a biochar > which sequesters carbon, hence a 'carbon negative' claim can be made.
Qualify which type of gasification, because 5% would only apply to a high performance gas making system. If however it was a pyrolysing char making system, about 1/3rd of the fuel weight would be char, but two thirds would be consumed by combustion to become a CO2 emission. So not honestly carbon negative in my opinion (other than replacing fossil carbon). Restoration of the environmental CO2 balance would be a tricky calculation. > Alternatively, if the woody waste is left to rot in situ, the carbon > sequestration is 0% (all carbon is released/transformed into CO2 and other > gasses). That fits the normal explanations, we all go back to CO2 and CH4 if left to rot(:-) > True? Truth can be very elastic sided when claims are made about gasification, so take care to confirm all calculations regarding the process in question.There is a lot of attention paid to carbon credits as an intensive to cheat in the Souther Hemisphere, and one should be careful if included in any proposals. Doug Williams, Fluidyne. _______________________________________________ Gasification mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org for more Gasifiers, News and Information see our web site: http://gasifiers.bioenergylists.org/
