Gasification furnace

Abstract

A gasification furnace has a gasification chamber for pyrolyzing a raw material in a fluidized medium being fluidized therein to produce a pyrolysis gas and a pyrolysis residue. The gasification furnace also has a combustion chamber for receiving the pyrolysis residue together with the fluidized medium, combusting the pyrolysis residue in the fluidized medium being fluidized therein to heat the fluidized medium, and returning the fluidized medium to the gasification chamber. The gasification furnace includes a partition wall for separating the gasification chamber and the combustion chamber from each other. The partition wall includes a first steel plate having a cooling structure to prevent the pyrolysis gas from flowing between the gasification chamber and the combustion chamber. The gasification furnace allows a general material to be used for components therein and have a long repair period.

1 . A gasification furnace comprising: 
 a gasification chamber for pyrolyzing a raw material in a fluidized medium being fluidized therein to produce a pyrolysis gas and a pyrolysis residue;    a combustion chamber for receiving the pyrolysis residue together with the fluidized medium, combusting the pyrolysis residue in the fluidized medium being fluidized therein to heat the fluidized medium, and returning the fluidized medium to said gasification chamber; and    a partition wall for separating said gasification chamber and said combustion chamber from each other, said partition wall including a first steel plate having a cooling structure to prevent the pyrolysis gas from flowing between said gasification chamber and said combustion chamber.    
     
     
         2 . The gasification furnace as recited in  claim 1 , wherein said cooling structure is operable to cool said first steel plate by a cooling fluid.  
     
     
         3 . The gasification furnace as recited in  claim 1 , further comprising: 
 a circumferential furnace wall for separating internal gases in said gasification chamber and said combustion chamber from an exterior of said gasification furnace, said circumferential furnace wall including a second steel plate and a refractory material covering an inner surface of said second steel plate.    
     
     
         4 . The gasification furnace as recited in  claim 3 , wherein said cooling structure is operable to cool said first steel plate by a cooling fluid, 
 wherein said gasification furnace comprises a temperature controller operable to control a temperature of the cooling fluid so that a temperature of said partition wall is substantially equal to a temperature of said circumferential furnace wall.    
     
     
         5 . The gasification furnace as recited in  claim 1 , wherein said partition wall has an opening through which the fluidized medium flows between said gasification chamber and said combustion chamber, 
 wherein said gasification chamber and said combustion chamber have furnace bottoms adjacent to said opening of said partition wall, respectively,    wherein said furnace bottom downstream of a flow of the fluidized medium is located lower than said furnace bottom upstream of the flow of the fluidized medium.    
     
     
         6 . The gasification furnace as recited in  claim 1 , wherein said partition wall has an opening through which the fluidized medium flows from said gasification chamber into said combustion chamber, 
 wherein said gasification chamber and said combustion chamber have furnace bottoms adjacent to said opening of said partition wall, respectively,    wherein said furnace bottom of said combustion chamber is located lower than said furnace bottom of said gasification chamber.    
     
     
         7 . The gasification furnace as recited in  claim 1 , wherein said partition wall has an opening through which the fluidized medium flows from said combustion chamber into said gasification chamber, 
 wherein said gasification chamber and said combustion chamber have furnace bottoms adjacent to said opening of said partition wall, respectively,    wherein said furnace bottom of said gasification chamber is located lower than said furnace bottom of said combustion chamber.