POWER STATION AND METHOD FOR OPERATING THE SAME

摘要

The combustion plant (1) according to the invention, comprising a burner (3) and a combustion chamber (2), is connected by way of a line (4a) to a high-temperature membrane (5c) for extracting the combustion oxygen from the air, wherein the membrane unit (5) has a feed line for a flushing gas on the permeate side. The combustion plant (1) further comprises a circulation element for recirculated flue gas (4a, 4b, Gk, Hk, Hh), wherein a heat exchanger (13) is connected upstream of the membrane unit (5) inside the flue gas line (4b). The method according to the invention for operating said combustion plant, in which carbon-containing fuel is burned in an oxygen/flue gas atmosphere, and in which the oxygen for combustion is produced from air by way of a membrane unit comprising a high-temperature membrane, and in which the flue gas is in part recirculated, is characterized by the steps that the recirculated flue gas is first cooled, optionally for a flue gas scrubbing process, the cooled flue gas is subsequently reheated to ensure the necessary operating temperature of the membrane, wherein the heating energy is extracted from a heat exchange with the flue gas having the corresponding temperature level of the combustion process, and the flue gas heated in this way is fed to the membrane unit as a flushing gas.