Cooler

A cooler (1) for cooling particulate material (2) which has been subjected to heat treatment in an industrial kiln (3), such as a rotary kiln for manufacturing cement clinker, which cooler (1) comprises an inlet (4), an outlet (5), end walls (6), side walls (7), a bottom (8) and a ceiling (9), at least three reciprocating supporting lanes (10) for receiving, supporting and transporting the material to be cooled, the lanes (10) are moving following the walking floor principles, cooling gas is injected upwards between the bottom (8) and the lanes (10), the cooling gas is going through grate plates (12) in the lanes (10), the cooling gas is then passing through the material (2) and where at a distance from the inlet a heat recuperation boarder is established such that air on the inlet side of the heat recuperation boarder (11) will return to the kiln (3) wherein elements 16 extend upwards from an upper surface of the supporting lanes, where the elements (16) on a supporting lane are spaced creating a grate plate zone G (13), which element has an upper part L which is tilted towards the outlet (5) end of the cooler, which upper part has a length L (17) which is more than 1/40 of G (13) and where the upper part L has an angle alpha (18) which is more than 5 deg. and less than 80 deg. between the upper part L and horizontal.