Forschungszentrum Juelich Gmbh

Forschungszentrum Julich Gmbh

Stefan Baumann

Wilhelm Albert Meulenberg

Ernst Riensche

Detlev Stoever

Jose Manuel Serra Alfaro

Hans-Peter Buchkremer

Reinhard Menzer

Ludger Blum

Jewgeni Nazarko

A method for generating heat energy in a power plant by burning a carbonaceous fuel in a combustion chamber of the power plant and a system for carrying out the method is described. A combustion chamber is fluidly connected to a membrane chamber that includes a membrane operating at a temperature between 600 and 1000&#xb0; C. The combustion chamber receives a cleaned flue-gas oxygen mixture for combustion from the membrane chamber. Oxygen from heated air passes through the membrane in the membrane chamber to the permeate side of the membrane, where it is mixed with cleaned heated flue gas and the resulting gas mixture is fed to the combustion chamber. Flue gas removed from the combustion chamber are cooled, cleaned and heated as described herein and recirculated to the membrane chamber.

Power station and method for operating the same

Provided is a power plant for generating electrical energy comprising a combustion chamber for producing steam, at least one downstream flue gas purification stage, a separation stage for CO, a recycling circuit for the flue gas, and a high-temperature Omembrane, which is connected upstream of the combustion chamber. The high-temperature Omembrane has an inlet and an outlet on the feed side which are thermally coupled by way of a heat exchanger. On the permeate side, the high-temperature Omembrane has only an outlet which is connected to the combustion chamber and/or the flue gas recycling circuit and a means for cooling and/or compression which is disposed in this outlet. The power plant, in which coal is burned using substantially pure oxygen, and in which the combustion waste gas is purified and partially recirculated to the combustion process, is operated in such a way that the oxygen that is used is obtained by separation from air using a high-temperature Omembrane, wherein the membrane is operated with atmospheric air at a pressure of up to 2 bar on the feed side and a negative pressure of between 0.02 and 0.5 bar is applied on the permeate side.

Power plant that uses a membrane and method for operating the same

A composite membrane for selective gas separation, comprises a layer system having a continuously porous, mechanically stable carrier layer, which has an average pore size in the &#x3bc;m range, further having at least one continuously porous intermediate layer, which is disposed on the carrier layer and has an average pore size in the range of 2 to 200 nm, and further having a gastight functional layer, which is disposed on the intermediate layer and is made of a mixed-conductive material having a maximum layer thickness of 1 &#x3bc;m. The carrier layer comprises a structural ceramic, a metal, or a cermet and has a layer thickness of no more than 1 mm. The intermediate layer is present with a total layer thickness of no more than 100 &#x3bc;m and has an average pore size in the range of 10 to 100 nm. The functional layer comprises a perovskite, a fluorite, or a material having a KNiFstructure, such as LaSrCoFeO(LSCF). The layer thickness of the functional layer is no more than 50 nm, and particularly between 25 and 400 nm. In order to produce this composite membrane, at least one porous intermediate layer is applied onto a continuously porous, mechanically stable carrier layer, which has an average pore size in the &#x3bc;m range, wherein the intermediate layer has an average pore size in the range of 2 to 200 nm. A further gastight, functional layer made of a mixed-conductive material and having a maximum layer thickness of 1 &#x3bc;m is applied onto the intermediate layer.

Oxygen-permeable membrane and method for the production thereof

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Aachen, Germany

Stefan Baumann