Cathode humidification of a PEM fuel cell by exhaust gas recirculation in a positive displacement compressor

摘要

A fuel cell stack receives an oxidizer into a compressor that progressively pressurizes the oxidant from an inlet pressure to a discharge pressure, wherein fluid communication between an oxidant effluent from the fuel cell stack and the progressively pressurized oxidant in the compressor at an intermediate pressure between the compressor inlet pressure and the Kompressoraustragsdruck is present. A pressure regulator is provided to manage the pressure of the return flow of the oxidant effluent of the cell to the compressor, and the compressor energy consumption and / or the compressor discharge temperature, humidity and / or pressure are measured to further control the controller.