Method and device for combustion type exhaust gas treatment

Abstract

A combustion type waste gas treatment method wherein waste gas discharged from an industrial product manufacturing process is introduced into combustion flames to thermally or oxidatively decompose a combustible component in the waste gas. Hydrogen gas and oxygen gas are generated by electrolysis of water and supplied as a gas for combustion to form the combustion flames. A pipe or a hole through which the combustion flames can be viewed directly is formed in a wall of the burner part upstream of the combustion flames. The combustion flames are detected with a UV sensor through the pipe or the hole.

1 . A combustion type waste gas treatment method in which waste gas is introduced into combustion flames to thermally or oxidatively decompose a combustible component in the waste gas, wherein hydrogen gas and oxygen gas are generated by electrolysis of water, and said hydrogen gas and oxygen gas are supplied as a gas for combustion to form said combustion flames.  
     
     
         2 . A combustion type waste gas treatment method according to  claim 1 , wherein said hydrogen gas and said oxygen gas are supplied to form the combustion flames without changing a ratio of said gases as generated.  
     
     
         3 . A combustion type waste gas treatment apparatus comprising a device for electrolysis of water to generate hydrogen gas and oxygen gas, and a burner part for forming combustion flames from the hydrogen gas and oxygen gas generated by said device for electrolysis of water.  
     
     
         4 . A combustion type waste gas treatment apparatus according to  claim 3 , wherein a combustion chamber in which waste gas is introduced into said combustion flames to carry out thermal oxidative decomposition of the waste gas is provided downstream of said burner part.  
     
     
         5 . A combustion type waste gas treatment apparatus having a burner part and a combustion chamber positioned at a downstream side of the burner part, wherein the burner part is supplied with an auxiliary burning gas to form combustion flames extending from the burner part toward the combustion chamber, and waste gas is introduced into the combustion flames to oxidatively decompose the waste gas, 
 said combustion type waste gas treatment apparatus comprising a pipe or a hole through which the combustion flames can be viewed directly, said pipe or hole being formed in a wall of the burner part upstream of the combustion flames, and a UV sensor for detecting the combustion flames through said pipe or hole.    
     
     
         6 . A combustion type waste gas treatment apparatus according to  claim 5 , wherein a UV light-transmitting member is disposed at a joint between said pipe or hole allowing direct viewing of the combustion flames and said UV sensor to isolate said UV sensor from an atmosphere in said burner part, and a purge gas is supplied from the UV light-transmitting member in said pipe or hole toward said burner part.  
     
     
         7 . A combustion type waste gas treatment apparatus according to  claim 5 , wherein said pipe or hole allowing direct viewing of the combustion flames is closed at an end thereof remote from said burner part, and light from combustion flames in said pipe or hole is transmitted to said UV sensor through an optical fiber.  
     
     
         8 . A combustion type waste gas treatment apparatus having a burner part and a combustion chamber positioned at a downstream side of the burner part, wherein the burner part is supplied with an auxiliary burning gas to form combustion flames extending from the burner part toward the combustion chamber, and waste gas is introduced into the combustion flames to oxidatively decompose the waste gas, 
 wherein the auxiliary burning gas is supplied to the burner part through a nozzle hole that opens on an inner wall surface of the burner part, said nozzle hole comprising a group of at least three nozzle openings formed close to each other.    
     
     
         9 . A combustion type waste gas treatment apparatus according to  claim 8 , wherein an injection velocity of the auxiliary burning gas injected from said group of nozzle openings is higher than a propagation velocity of the flames.