Grate block for a combustion grate

Abstract

The invention relates to a grate block (10) for a combustion grate. The grate block (10) comprises a block body (12) having an upper wall (14) which forms a bearing surface (16) and along which the combustible material is to be conveyed and a front wall (20) which has a lower bearing edge (23), said bearing edge (23) being designed to come into contact with the bearing surface of an adjacent grate block in a feed direction S, wherein the upper wall (14) has an air supply opening (35) formed by an air supply channel (38). The air supply opening (35) is at least partially surrounded by a thickened portion (50) which protrudes from the bearing surface (16), forms a protective channel (57) extending the air supply channel (38), and is designed to prevent liquid from flowing into the air supply opening (35).