Gas distributor for a rotary kiln

Abstract

A rotating air distributor for rotary reactors such as rotary kilns for the gasification of biomass and other carbonaceous materials for efficient mixing and maximum conversion of solid biomass and other carbonaceous materials into synthesis fuel gas is disclosed. The invention includes a 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. 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 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.

1 . A rotating distributor for use in a kiln, comprising:
 a gas port extending through the length of the kiln, supported at ends of the kiln, and having an inlet for reactive gases,   a plurality of nozzles distributed circumferentially and laterally along the gas port, and   a gas plug movably mounted in the gas port to restrict air into the kiln,   wherein the kiln has a vessel, and the gas port extends through the vessel and rotates independently from the vessel.   
     
     
         2 . The distributor as claimed in  claim 1 , wherein the plurality of nozzles are spaced along the gas port. 
     
     
         3 . The distributor as claimed in  claim 2 , wherein the plurality of nozzles are progressively smaller in diameter along the gas port. 
     
     
         4 . A kiln, comprising:
 (a) a rotary vessel having ends,   (b) a rotating distributor having a gas port extending through the length of the kiln and supported at the ends, a plurality of nozzles along the length of the gas port, the plurality of nozzles distributed circumferentially and laterally along the gas port, a rotating port, and a gas plug mounted in the gas port is movable to restrict air into the kiln, wherein the gas port rotates independently from the vessel and the gas port has an inlet for reactant gases;   (c) a variable speed drive that rotates the gas port;   (d) a gas outlet at one of the ends of the vessel; and   (e) flexible seal insertions at the ends of the vessel;   
     
     
         5 . The kiln as claimed in  claim 4 , wherein the gas port extends approximately two-thirds along the way into the kiln, when the kiln operates as a gasifier. 
     
     
         6 . The kiln as claimed in  claim 4 , wherein the gas plug within the gas port is movable from outside of the kiln. 
     
     
         7 . The kiln as claimed in  claim 4 , wherein the gas plug is movable within the gas port from outside the kiln 
     
     
         8 . The kiln in  claim 4 , wherein the kiln and the gas port are positioned horizontal with respect to the ground. 
     
     
         9 . The kiln in  claim 4 , wherein the nozzles terminate at a distance between the gas port and a wall of the kiln. 
     
     
         10 . A method for using a kiln, comprising:
 (a) injecting carbonaceous materials into the kiln;   (b) injecting compressed reactive gases into an air distributor having a gas port extending through the length of the kiln, supported at ends of the kiln, and having an inlet for reactive gases, a plurality of nozzles distributed circumferentially and laterally along the gas port, and a gas plug movably mounted in the gas port to restrict air into the kiln, wherein the kiln has a vessel, and the gas port extends through the vessel and rotates independently from the vessel; and   (c) rotating the main conduit such that reactive gases are spread along walls of the kiln and mix with the carbonaceous materials.   
     
     
         11 . The method as claimed in  claim 10 , further comprising manipulating the gas plug to improve mixing of the gas and carbonaceous materials. 
     
     
         12 . The method as claimed in  claim 10 , wherein the gas port is positioned horizontally with respect to the ground. 
     
     
         13 . The distributor as claimed in  claim 12 , wherein the plurality of nozzles are spaced along the gas port. 
     
     
         14 . The distributor as claimed in  claim 12 , wherein the plurality of nozzles are progressively smaller in diameter along the gas port.