METHOD AND COOLER FOR COOLING HOT PARTICULATE MATERIAL

摘要

A description is provided of a cooler (1) for cooling hot particulate material which has been subjected to heat treatment in an industrial kiln such as a rotary kiln (3) for manufacturing cement clinker, said cooler (1) comprising a grate (21) for receiving and supporting hot material from the kiln, at least one cooling gas duct (28) which is connected to slots (20) in the grate (21) for introducing cooling gases into the hot material and a compressed air system (25, 26) for injecting compressed air into the material on the grate (21). The cooler is characterized in that it comprises flow restricting means (31) which are provided in the cooling gas duct (28). It is hereby obtained, without using mechanically movable components that only a very limited amount of the compressed air which is injected into the material on the grate is allowed to pass through the cooling gas duct. This is due to the fact that the flow restricting means, as a consequence of the pressure conditions prevailing immediately under the grate when compressed air is injected will operate as a non- return valve which will substantially prevent compressed air from passing down through the cooling gas duct.