NOVELTY - A rotating air distributor for rotary reactors such as rotary ions for tile gasification of biomass and other carbonaceous materials for efficient mixing of solid biomass and other carbonaceous materials and gaseous oxidant for maximum conversion of solid biomass and other carbonaceous materials into synthesis fuel gas is disclosed. The gas distribution port enters the rotary reactor through the stationary front plate and extends sufficiently into the reactor to assure mixing of oxidant and other reactants with the solid biomass or other carbonaceous material as well as to assure adequate supply of these gases in close proximity of the solid carbonaceous material to yield high conversions of these solid materials to fuel gas. The gas distribution port comprises of one main supply from which several discharge nozzles emerge at different angles and at different locations along the length of the reactor to provide distribution of gas throughout the intended length of the reactor. All of the discharge nozzles have certain predetermined length so that they terminate near the wall of the reactor near the proximity where most of the solid carbonaceous material resides in the rotary reactor. The diameter of the nozzles emanating from the main supply become progressively larger along the length of the port as these nozzles move away from the main supply source so that the resultant variation in pressure drop across these nozzles assure proper gas discharge and distribution throughout the reactor. The discharge of gas from the gas distribution port is adjusted by the variable position of a plug inside the port that can be adjusted during the operation of the kiln to achieve optimum gas-solid interaction along the length of the reactor. The entire gas distribution port is rotated with externally mounted motor to create turbulence inside the reactor which further promotes gas-solid interaction and thereby reaction inside the reactor. The rotating action of the gas distribution port also facilitates and eases the passage of reacted biomass solid and other carbonaceous material residue through the reactor. Image 0/0