Air-cooled grate block

Abstract

An air-cooled grate block of a grate for the thermal treatment of waste, in which the grate blocks are arranged so as to rest one on top of the other in a step-like manner. The block body designed as a cast part has a top wall, forming a bearing surface, and a front wall, on which a foot is integrally formed. A first cooling passage section runs from a wall inlet, arranged on the underside of the top wall, through the top wall and the front wall to an outlet opening arranged in the front wall. A cooling passage wall which starts from an inlet opening arranged adjacent to the foot and to the front wall and is at a distance from the front wall and the top wall forms a second cooling passage section fluidically connected to the first cooling passage section at the wall inlet. A grate which consists of the abovementioned grate blocks is likewise described.

1 . An air-cooled grate block of a grate for the thermal treatment of waste, in which the grate blocks are arranged so as to rest one on top of the other in a step-like manner, comprising a block body, which is designed as a cast part and which has a top wall, forming a bearing surface, and a front wall, on which a foot is integrally formed, a first cooling passage section running from a wall inlet, arranged on an underside of the top wall, through the top wall and the front wall to an outlet opening arranged in the front wall, wherein a cooling passage wall which starts from an inlet opening arranged adjacent to the foot and to the front wall and is at a distance from the front wall and the top wall forms a second cooling passage section fluidically connected to the first cooling passage section at the wall inlet. 
     
     
         2 . The grate block as claimed in  claim 1 , wherein the first cooling passage section and the second cooling passage section run with a varying cross section. 
     
     
         3 . The grate block as claimed in  claim 1 , wherein the grate block has a rib which extends in the longitudinal direction of the block body, is integrally formed on the top wall and the front wall and is arranged substantially perpendicularly thereto. 
     
     
         4 . The grate block as claimed in  claim 3 , wherein the rib is a central rib. 
     
     
         5 . The grate block as claimed in  claim 1 , wherein the first cooling passage section and the second cooling passage section extend over the entire length of the top wall. 
     
     
         6 . The grate block as claimed in  claim 1 , wherein the first cooling passage section and the second cooling passage section extend only over the part of the length of the top wall. 
     
     
         7 . The grate block as claimed in  claim 1 , wherein the cross section of the second cooling passage section increases from the inlet opening toward the wall inlet and the cross section of the first cooling passage section decreases from the wall inlet toward the outlet opening. 
     
     
         8 . The grate block as claimed in  claim 3 , wherein the block body has deflecting webs integrally formed on the rib and projecting substantially perpendicularly from the latter, the deflecting webs being arranged offset from one another. 
     
     
         9 . The grate block as claimed in  claim 8 , wherein the deflect webs form a meandering passage fluidically connected to the second cooling passage section at the inlet opening and having a cooling inlet opening, the position of the passage inlet opening being dependent on a position of the grate block relative to a grate block following in a direction. 
     
     
         10 . The grate block as claimed in  claim 1 , wherein the top wall has a trough-shaped recess facing the combustion space. 
     
     
         11 . A grate comprising grate blocks as claimed in  claim 1 . 
     
     
         12 . The grate as claimed in  claim 11 , comprising a plurality of fixed grate block rows and a plurality of movable grate block rows which are arranged alternately, a plurality of grate blocks being attached side by side to a grate-retaining tube and being fixedly connected to one another and forming the respective grate block rows, wherein both the fixed and the movable grate block rows are formed by the grate blocks.