Combustion type waste gas treatment system

Abstract

A combustion type waste gas treatment system capable of oxidatively decomposing a hazardous combustible waste gas while heating efficiently with a structure which allows the waste gas to mix with an auxiliary burning gas efficiently without the occurrence of backfire in a waste gas inlet pipe. The combustion type waste gas treatment system has a burner part and a combustion chamber. Combustion flames are formed to extend from the burner part toward the combustion chamber, and a combustible waste gas is introduced into the combustion flames from waste gas inlet pipes thereby oxidatively decomposing the waste gas. A flow velocity accelerating device makes the flow velocity of the combustible waste gas flowing through the waste gas inlet pipe higher than the burning velocity of the combustible waste gas.

1 . A combustion type waste gas treatment system comprising: 
 a burner part;    a combustion chamber provided at a downstream side of said burner part; means for forming combustion flames from said burner part toward said combustion chamber; and    a waste gas inlet pipe opening on an inner wall surface of said burner part to introduce a combustible waste gas into said combustion frames, thereby oxidatively decomposing said waste gas;    wherein said waste gas inlet pipe is provided with flow velocity accelerating means for making a flow velocity of the combustible waste gas flowing through said waste gas inlet pipe higher than a burning velocity of said combustible waste gas.    
   
   
       2 . The system of  claim 1 , wherein said flow velocity accelerating means is a narrowed pipe portion with a reduced pipe diameter or an orifice provided in a predetermined portion of said waste gas inlet pipe, said narrowed pipe portion or orifice having an inner diameter set so that the flow velocity of the combustible waste gas passing through said narrowed pipe portion or orifice will be higher than the burning velocity of said combustible waste gas.  
   
   
       3 . The system of  claim 1 , wherein said flow velocity accelerating means is provided in a coupling mechanism for coupling together a flange at an inlet of said waste gas inlet pipe and a flange at an end of a waste gas supply pipe for supplying said waste gas to said inlet, said coupling mechanism including a plate-shaped member having an orifice opening formed in a center thereof and a clamp member for fastening together outer peripheral edges of the two flanges in a state where said plate-shaped member is interposed between said two flanges, said orifice opening having an inner diameter set so that the flow velocity of the combustible waste gas passing through said orifice opening will be higher than the burning velocity of said combustible waste gas.  
   
   
       4 . The system of any one of claims  1 , wherein said combustion flames form swirling flows in said burner part, said swirling flows including free vortices distributed in an area closer to an outer peripheral side and forced vortices distributed in an area closer to an inner peripheral side, 
 wherein a radial position of an opening of said waste gas inlet pipe that opens on the inner wall surface of said burner part is set in the area where said free vortices are distributed.    
   
   
       5 . A combustion type waste gas treatment system comprising: 
 a burner part;    a combustion chamber provided at a downstream side of said burner part;    means for forming combustion flames from said burner part toward said combustion chamber; and    a waste gas inlet pipe opening on an inner wall surface of said burner part to introduce a combustible waste gas into said combustion frames, thereby oxidatively decomposing said waste gas;    wherein said waste gas inlet pipe is installed on said burner part so that the waste gas blown off from an opening of said waste gas inlet pipe that opens on the inner wall surface of said burner part forms a swirling flow directed obliquely downward in said burner part and said combustion chamber.    
   
   
       6 - 10 . (canceled)  
   
   
       11 . The system of  claim 2 , wherein said combustion flames from swirling flows in said burner part, said swirling flows including free vortices distributed in an area closer to an outer peripheral side and forced vortices distributed in an area closer to an inner peripheral side, 
 wherein a radial position of an opening of said waste gas inlet pipe that opens on the inner wall surface of said burner part is set in the area where said free vortices are distributed.    
   
   
       12 . The system of  claim 3 , wherein said combustion flames from swirling flows in said burner part, said swirling flows including free vortices distributed in an area closer to an outer peripheral side and forced vortices distributed in an area closer to an inner peripheral side, 
 wherein a radial position of an opening of said waste gas inlet pipe that opens on the inner wall surface of said burner part is set in the area where said free vortices are distributed.