Burner Nozzle Configuration and its Use

Abstract

The invention relates to a device for cleaning a gas mixture comprising contaminants. The device comprises a cylinder and a burner nozzle for supplying a fuel to be burned, said burner nozzle being embodied for directing into the cylinder a flame, wherein the flame is directed in a flow direction of the gas mixture. The device is characterized in that the device comprises cone shaped gas conductor with a relatively wide entrance for the gas mixture to be cleaned and a relatively narrow exit, The tapered shape is positioned in the flow direction and the narrow part of which is positioned near or within the supply side of the cylinder, with the proviso that the device is embodied for supplying into the cylinder the gas mixture to be cleaned partly through the cone shaped gas conductor and partly around the cone shaped gas conductor. The burner nozzle is positioned at the narrow side of the cone.

1 . A device for cleaning a gas mixture that comprises contaminants, comprising:
 a cylinder with a supply side for supplying to the cylinder the gas mixture and a discharge side for discharging from the cylinder the cleaned gas mixture; and   a burner nozzle for supplying a fuel to be burned, which burner nozzle is embodied for directing into the cylinder a flame, wherein the flame is directed substantially in a direction of flow of the gas mixture to be cleaned;   
       characterized in that: 
       the device comprises a cone shaped gas conductor with an entrance for the gas mixture to be cleaned and an exit, wherein the entrance is relatively wider than the exit such that the cone has a tapered shape, the tapered shape of which is situated in the direction of flow with the exit positioned near or within the supply side of the cylinder, and wherein the burner nozzle is provided near the exit of the cone, with the proviso that the device is embodied for guiding the gas mixture to be cleaned partly through the cone shaped gas conductor and partly around the cone shaped gas conductor and into the cylinder. 
     
     
         2 . A device according to  claim 1 , wherein the exit of the cone is positioned inside the cylinder and the entrance to the cone is positioned outside the cylinder. 
     
     
         3 . A device according to  claim 1 , wherein both the entrance and the exit of the cone are positioned inside the cylinder. 
     
     
         4 . A device according to  claim 1 , wherein both the entrance to the cone and the exit are positioned outside the cylinder. 
     
     
         5 . A device according to  claim 1 , wherein the burner nozzle is provided at the exit of the cone. 
     
     
         6 . A device according to  claim 1 , wherein the burner nozzle is provided substantially distributed over the circumference of the exit of the cone. 
     
     
         7 . A device according to  claim 6 , wherein the burner nozzle comprises at least two nozzles that are distributed over the circumference of the exit of the cone. 
     
     
         8 . A device according to  claim 1 , wherein the fuel comprises H 2  and O 2 , preferably in a substantially stoichiometric ratio of 2 parts H 2  and 1 part O 2 . 
     
     
         9 . A device according to  claim 8 , wherein the fuel comprises H 2  and O 2  in a ratio of 2 parts H 2  and 1 to 1.2 part O 2 . 
     
     
         10 . A device according to  claim 1 , wherein the gas to be cleaned comprises oxidizable contaminants. 
     
     
         11 . A device according to  claim 6 , wherein the flames from the burner nozzles are substantially directed into a flow path of the gas to be cleaned. 
     
     
         12 . A device according to  claim 1 , wherein the cone and the cylinder are positioned substantially coaxially. 
     
     
         13 . A device according to  claim 1 , wherein the ratio of the diameter of the cone to the diameter of the cylinder is in a range of at least 0.6:1, preferably at least 0.7:1, more preferably at least 0.8:1, and still more preferably between 0.7:1 and 0.9:1. 
     
     
         14 . Use of the burner configuration according to  claim 1  for cleaning a gas that comprises contaminants, comprising the steps of supplying to the burner nozzle a fuel and igniting same for obtaining a flame, such that the flame is directed into the cylinder and a first part of said gas to be cleaned is supplied via the entrance of the cone to the exit of the cone and is at least partially fed into the flame for heating and decomposing contaminants in said gas mixture and a second part of said gas mixture is supplied into the cylinder around the cone for mixing said second part of the gas mixture to be cleaned with said heated first part. 
     
     
         15 . A use according to  claim 14 , comprising the step of supplying a fuel comprising H 2  and O 2  to the burner nozzle. 
     
     
         16 . A use according to  claim 15 , comprising the step of supplying a stoichiometric excess of O 2  in the fuel. 
     
     
         17 . A use according to  claim 14 , wherein the gas to be cleaned is air that is contaminated with asbestos. 
     
     
         18 . A use according to  claim 17 , wherein the mixture of cleaned gas and combustion products is returned to a confined environment.