Abstract: A pyrolysis chamber for the extraction of combustible gasses from biomass waste such as wood chips has a gravity fed chamber, where fuel passes, in succession, through a pre-heating zone, an oxidation and reduction zone, a gas outlet zone and a solids offloading zone. The pre-heating zone has plasma torches which direct an air plasma into the chamber, thereby pre-heating the fuel to a temperature of 1200-1500° C., after which the fuel enters the oxidation and reduction zone, where it is exposed to a steam plasma of 1500° C. which travels through plasma torches to an annular ring distributor surrounding the chamber and having apertures directing the steam plasma into the chamber, thereby providing enhanced generation of combustible gasses of CO and H2.