Abstract: A grate plate used in a grate cooler for bulk material, comprising a first region alternately covered by a further grate plate during use and having at least one pocket for holding bulk material as an autogenous wear protection layer, and a second region not covered during use, and also having at least one bulk material pocket and at least one cooling air opening leading to a grate plate underside. The height of the first region pockets is smaller than the second region pockets height. The base of the first region pockets is formed by multiple segments having upper surfaces as bulk material contact surfaces and between which gap-like cooling air channels are formed. Openings of the cooling air channels are oriented at an angle to vertical, such that an acute angle occurs between the conveying direction and the direction of the cooling air flow via these openings.

Abstract: A cooler for cooling hot bulk material, in which cooling gas flows transversely to the conveying direction through a bulk material bed cooling the bulk material. An apparatus carrying the bulk material bed has a ventilation floor comprised of movable planks extending in the conveying direction through which cooling gas flows. At least two adjacent planks are moved simultaneously in the conveying direction and non-simultaneously counter to the conveying direction. The planks have differently configured surfaces, on which the bulk material bed lies, in the conveying direction, and these surfaces, due to different frictional locking with the bulk material bed lying thereon, lead to differing mean transport speeds, and as a result the bulk material bed is stretched in a region of quicker conveying and compressed in a region of slower conveying. The apparatus tumbles the bulk material with vertical mixing, thereby heat is recuperated efficiently.