POWER PLANT THAT USES A MEMBRANE AND METHOD FOR OPERATING THE SAME

摘要

The invention relates to a power plant for generating electrical energy, comprising a combustion chamber (1) for producing steam, at least one waste gas purification stage (2) that is connected downstream, a separation stage for CO2 (3), a recycling circuit for the waste gas and a high-temperature O2 membrane (5) which is connected upstream of the combustion chamber. According to invention, the high-temperature O2 membrane has a supply inlet and an evacuation outlet on the feed side which are thermally coupled via a heat exchanger (6). The high-temperature O2 membrane has only one evacuation outlet on the permeate side that is connected to the combustion chamber and/or waste gas recycling circuit and said evacuation outlet is provided with cooling and/or compression means (8). The power plant, in which coal is burnt with the aid of practically pure oxygen and the combustion waste gas is purified and partially recycled to the combustion process, is operated according to the invention in such a way that the oxygen used is obtained by being isolated from air with the aid of a high-temperature O2 membrane. On the feed side said membrane is operated with atmospheric air at a pressure of up to 2 bar and on the permeate side a negative pressure of between 0.02 and 0.5 bar is applied.