Method for heat recovery in manufacturing gasified fuel

Abstract

The present invention provides a method for manufacturing a gasified fuel gasified by partial oxidation of a liquid fuel which contains water and has decreased viscosity effected by using oxygen, in which a water-decreased gasified fuel is manufactured by heating the liquid fuel to a predetermined temperature to separate into a water layer and a fuel layer, and by partially oxidizing; by using oxygen, the fuel layer obtained by liquid-liquid separation at the stage just before gasification so that gasification is carried out. The separation into a water layer and a fuel layer can be accelerated by adding an emulsion breaker to the liquid fuel or by applying an electric field.

What is claimed is:  
     
         1 . A method for heat recovery in manufacturing gasified fuel, comprising: 
 (a) partially oxidizing a raw fuel containing water vapor and sulfur compounds to produce a partially oxidized gasified fuel;    (b) condensing water from the partially oxidized gasified fuel by passing the partially oxidized gasified fuel through a saturator to produce a partially dry gasified fuel, wherein the partially dry gasified fuel is cooled to a temperature below condensation temperature of water;    (c) transferring the partially dry gasified fuel to a cooling device;    (d) further condensing water from the partially dry gasified fuel via the cooling device to produce a cool dry gasified fuel; and    (e) recycling the condensed water from the cooling device to the saturator to allow for heat recovery.    
     
     
         2 . The method for heat recovery in manufacturing gasified fuel according to  claim 1 , wherein the water content of the partially oxidized gasified fuel is 2 to 20% by volume.  
     
     
         3 . The method for heat recovery in manufacturing gasified fuel according to  claim 1 , further comprising: 
 (f) desulfurizing the cool dry gasified fuel; and    (g) heating and adding moisture to the cool dry gasified fuel by passing the cool dry gasified fuel through the saturator.    
     
     
         4 . The method for heat recovery in manufacturing gasified fuel according to  claim 1 , wherein the saturator is a tube type heat exchanger.  
     
     
         5 . The method for heat recovery in manufacturing gasified fuel according to  claim 1 , wherein the partially oxidized gasified fuel also contains carbonyl sulfide, further comprising contact reducing the carbonyl sulfide within the partially oxidized gasified fuel into hydrogen sulfide prior to condensing water from the partially oxidized gasified fuel.  
     
     
         6 . The method for heat recovery in manufacturing gasified fuel according to  claim 3 , wherein (f) further comprises contacting the cool dry gasified fuel with an absorbent.  
     
     
         7 . The method for heat recovery in manufacturing gasified fuel according to  claim 3 , wherein (d) further comprises cooling the partially dry gasifed fuel to a temperature between 30° C. and 60° C.  
     
     
         8 . The method for heat recovery in manufacturing gasified fuel according to  claim 1 , further comprising removing dust from the partially oxidized gasified fuel.