Slag discharge apparatus and slag discharge method

Abstract

The objective of the present invention is to facilitate passing of slag accumulated on a top face of a screen through openings in the screen. A combustor of a gasifier ( 10 ) that gasifies a carbonaceous feedstock is provided with a slag crusher ( 20 ) which discharges slag produced in and fallen from the combustor out of the gasifier ( 10 ). The slag crusher ( 20 ) comprises: a screen ( 22 ) which is provided transversely with respect to the fall direction of the slag and has a plurality of openings ( 30 ) to allow slag pieces that are smaller than the diameter of the openings ( 30 ) to pass through the screen ( 22 ); a spreader ( 24 ) which moves along the top face of the screen ( 22 ) and crushes the slag accumulated on the top face of the screen ( 22 ); and a nozzle ( 26 ) which spouts pressurized water onto the slag accumulated on the screen ( 22 ).

1 - 8 . (canceled) 
     
     
         9 . A slag discharge device which is provided on a combustor of a gasifier gasifying a carbon containing fuel and discharges slag produced in and falling from the combustor out of the gasifier, comprising:
 a screen which is provided transversely with respect to the fall direction of the slag and has a plurality of openings to allow slag pieces which are smaller than diameters of the openings to pass through the screen;   crushing means moving along a top face of the screen to crush the slag accumulated on the top face of the screen; and   an emitting hole which emits liquid, which is pressurized, fluidizes the slag accumulated on the screen, and allows the slag to pass through the openings, onto the slag.   
     
     
         10 . The slag discharge device according to  claim 9 ,
 wherein the emitting hole is provided on a side wall of the screen which is erected in parallel with respect to an operating direction of the crushing means.   
     
     
         11 . The slag discharge device according to  claim 9 ,
 wherein the emitting hole is provided in the crushing means.   
     
     
         12 . The slag discharge device according to  claim 9 ,
 wherein the crushing means includes an inclined surface which is inclined forward with respect to a crushing direction of the slag.   
     
     
         13 . The slag discharge device according to  claim 12 ,
 wherein the emitting hole is provided on the inclined surface, and emits the liquid in the direction of the screen.   
     
     
         14 . The slag discharge device according to  claim 9 ,
 wherein the emitting hole is provided in the screen.   
     
     
         15 . The slag discharge device according to  claim 14 ,
 wherein the emitting hole emits gas instead of the liquid.   
     
     
         16 . A slag discharge method of using a slag discharge device which is provided on a combustor of a gasifier gasifying a carbon containing fuel and discharges slag produced in and falling from the combustor out of the gasifier, comprising:
 a first step of emitting liquid, which is pressurized from an emitting hole, fluidizes the slag, and causes the slag to pass through a plurality of openings, onto the slag accumulated on a top face of a screen which is provided transversely with respect to the fall direction of the slag and has the plurality of openings; and   a second step of moving crushing means for crushing the slag accumulated on the top face of the screen along the top face of the screen.