Slag discharge apparatus and slag discharge method

Abstract

A slag crusher ( 20 ) is provided in a combustor of a gasifier ( 10 ) for gasifying a carbonaceous feedstock, and discharges falling slag generated in the combustor from the gasifier ( 10 ). The slag crusher ( 20 ) is provided with: a screen ( 22 ) provided so as to intersect with the direction in which the slag falls, the screen ( 22 ) having a plurality of openings ( 30 ) and passing slag having a diameter smaller than that of the openings ( 30 ); a spreader ( 24 ) for moving over the top surface of the screen ( 22 ) and crushing slag deposited on the top surface of the screen ( 22 ); and a nozzle ( 26 ) for spraying high-pressure water onto the slag deposited on the screen ( 22 ). The slag deposited on the top surface of the screen ( 22 ) thereby more easily passes from the openings ( 30 ) in the screen ( 22 ).

1 . A slag discharge apparatus which is provided on a combustor of a gasifier gasifying a carbonaceous feedstock 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 which is smaller than diameters of the openings to pass through the screen;   crushing means for moving along a top face of the screen to crush the slag accumulated on the top face of the screen; and   water flow generating means for allowing liquid to flow onto the slag accumulated on the screen to generate a water flow,   wherein a plurality of crushing means adjacent to each other are provided on the top surface of the screen, the screen is partitioned between the adjacent crushing means by partition means so as to be divided, and the water flow generating means is provided for each divided region.   
     
     
         2 . The slag discharge apparatus according to  claim 1 ,
 wherein the water flow generating means is provided on a side wall of the screen which is erected in parallel with respect to an operating direction of the crushing means.   
     
     
         3 . The slag discharge apparatus according to  claim 1 ,
 wherein the water flow generating means is provided in the crushing means.   
     
     
         4 . The slag discharge apparatus according to  claim 1 ,
 wherein the crushing means includes an inclined surface which is inclined forward with respect to a crushing direction of the slag.   
     
     
         5 . The slag discharge apparatus according to  claim 4 ,
 wherein the water flow generating means is provided on the inclined surface, and spouts the liquid in the direction of the screen.   
     
     
         6 . The slag discharge apparatus according to  claim 1 ,
 wherein the water flow generating means is provided in the screen.   
     
     
         7 . The slag discharge apparatus according to  claim 6 ,
 wherein the water flow generating means spouts gas instead of the liquid.   
     
     
         8 . The slag discharge apparatus according to  claim 1 , further comprising:
 a guide which limits the movement direction of the crushing means.   
     
     
         9 . (canceled) 
     
     
         10 . The slag discharge apparatus according to  claim 1 ,
 wherein before a predetermined crushing means is operated, the water flow from the water flow generating means provided below the region corresponding to the predetermined crushing means moves the slag to the regions corresponding to adjacent other crushing means.   
     
     
         11 . The slag discharge apparatus according to  claim 1 ,
 wherein the lower end portion of the crushing means comes into surface-contact with a surface, which faces crushing means when the crushing means moves, in a width direction.   
     
     
         12 . A slag discharge method of using a slag discharge apparatus which is provided on a combustor of a gasifier gasifying a carbonaceous feedstock and discharges slag produced in and falling from the combustor out of the gasifier, comprising:
 a first step of allowing liquid from water flow generating means to flow onto slag accumulated on a top face of a screen, which is provided transversely with respect to the fall direction of the slag and has a plurality of openings, to generate a water flow; 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,   wherein a plurality of crushing means adjacent to each other are provided on the top surface of the screen, the screen is partitioned between the adjacent crushing means by partition means so as to be divided, and the water flow generating means is provided for each divided region.