Parallel-flow regenerative shaft kiln and method for burning carbonate rock

Abstract

A parallel-flow regenerative shaft kiln for burning and cooling material, such as carbonate rock, comprises two shafts which are operable alternately as a burning shaft and as a regenerative shaft and are connected to one another by a connecting duct, wherein in the flow direction of the material each shaft comprises a preheating zone for preheating the material, a burning zone for burning the material and a cooling zone for cooling the material, wherein each shaft has an offgas outlet for discharging offgas from the shaft, wherein the PFR shaft kiln has a cooling gas outlet for discharging cooling gas from the shaft and wherein the cooling gas outlet is arranged in the preheating zone or the burning zone. In a method of burning material, such as carbonate rocks, in a parallel-flow regenerative shaft kiln having two shafts, which are operated alternately as a burning shaft and as a regenerative shaft and are connected to one another by a connecting duct, the material flows through a material inlet into a preheating zone for preheating the material, a burning zone for burning the material and a cooling zone for cooling the material to a material outlet, wherein a cooling gas is admitted into the cooling zone, wherein offgas is discharged from one of the shafts via an offgas outlet and wherein the cooling gas is discharged from at least one of the shafts via a cooling gas outlet in the preheating zone or the burning zone.

Dependencies are inferred from the claim text.