Abstract: The invention relates to multi-stage cement calcining plant suspension preheater of the kind mentioned in the introduction, wherein the preheater comprises a top separator comprising a central tube entering the top separator in a lowermost part of the separator housing whereas the central tubes of the bottom separators enters the separator housing in an upper part of the separator housing.

Abstract: The invention relates to multi-stage cement calcining plant suspension preheater of the kind mentioned in the introduction, wherein the preheater comprises a top separator comprising a central tube entering the top separator in a lowermost part of the separator housing whereas the central tubes of the bottom separators enters the separator housing in an upper part of the separator housing.

Abstract: A method as well as a cooler for cooling hot particulate material which has been subjected to heat treatment in an industrial kiln, such as a rotary kiln for manufacturing cement clinker may be configured such that hot material from the kiln is directed onto a grate in a cooler where cooling gases via at least one cooling gas duct are directed through slots in the grate for cooling the hot material and where compressed air can be injected into the material on the grate. The method as well as the cooler is characterized in that compressed air is injected into the cooling gas duct. The compressed air which is injected into the cooling gas duct may operate as a non-return valve which can ensure that compressed air is injected into the material on the grate and may prevent clinker dust from falling through the cooling gas duct.