Tom Reed, I presume you are using a downdraft gasifier in the discussion. In an updraft or counter-current design, the char is all that the oxidixer has to work with as the volatiles are already separated in the post oxidizer reaction zone. Sincerely, Tom Taylor The Gasification List is sponsored by USDOE BioPower Program http://www.eren.doe.gov/biopower/ and PRM Energy Systems http://www.prmenergy.com Other Sponsors, Archives and Information http://www.nrel.gov/bioam/ http://www.crest.org/renewables/gasification-list-archive http://solstice.crest.org/renewables/biomass-info/gasref.shtml http://www.crest.org/renewables/biomass-info/ http://www.crest.org/renewables/biomass-info/carbon.shtml