POWER STATION HAVING HOT CO2 GAS RECYCLING AND METHOD FOR OPERATING THE SAME

摘要

The invention relates to an improved power station having hot CO₂ gas recycling which recycles CO₂ from the combustion process at high temperature. For this, compared with the previously known power station designs, two improvements have been made. Firstly, the flue gas/air heat exchanger was matched to the requirements of the high temperature membrane and connection to the high temperature membrane designed in such a manner that the hot gas and the air now flow in countercurrent through these components. The hot flue gas flows in this case first through the membrane and then is cooled in the heat exchanger, the air in contrast is first heated in the heat exchanger and reaches the membrane with sufficiently high temperature. The gas temperatures in the membrane are virtually constant and the temperature differences between flue gas and air in the membrane are advantageously low. The abovementioned connection succeeds in producing a region within the hot gas circuit having considerably decreased temperature of approximately 500°C. By shifting position of the circulation fan to this region, the problem of previously absent implementation of a hot gas fan is solved.