Method for the gasification of coal

Abstract

The present invention is a method for the gasification of coal wherein a slurry of coal and water is supplied to a gasification reactor, characterized in that at least apart of the water is supplied in a form of steam to the gasification reactor. This method solves all of the aforesaid problems in the conventional method for supplying a coal/water slurry to a gasification reactor and attains a remarkably high efficiency.

1 . A method for the gasification of coal wherein a slurry of coal and water is supplied to a gasification reactors characterized in that at least a part of the water is supplied in a form of steam to the gasification reactor.  
     
     
         2 . The method for the gasification of coal according to  claim 1 , wherein substantially all of the water is supplied in a form of steam to the gasification reactor.  
     
     
         3 . The method for the gasification of coal according to  claim 1 , wherein a mixture is supplied to the gasification reactor, the mixture being obtained by heating the slurry of coal and water to 150° C. to 450° C. at a pressure of 0.2 to 11.5 MPa to thereby vaporize at least a part of the water.  
     
     
         4 . The method for the gasification of coal according to  claim 3 , wherein the slurry of coal and water is heated with a heating medium having a temperature of 200 to 600° C.  
     
     
         5 . The method for the gasification of coal according to  claim 1 , wherein a water content is in a range of from 27 to 50 wt. % based on a total weight of the slurry.  
     
     
         6 . The method for the gasification of coal according to  claim 1 , wherein the coal is pneumatically transferred by steam into the gasification reactor, the steam being obtained by heating the slurry of coal and water.