DEVICE AND METHOD FOR THE FLEXIBLE USE OF ELECTRICITY

摘要

An electrolysis cell for chlorine-alkali electrolysis comprising an anode half-cell, a cathode half-cell and a cation-exchange membrane separating the anode half-cell and the cathode half-cell from one another, an anode arranged in the anode half-cell for the development of chlorine, an oxygen-consuming electrode arranged in the cathode half-cell as a cathode, a catholyte space formed between the cation-exchange membrane and the oxygen-consuming electrode and flowed through by electrolyte, a gas space adjoining the oxygen-consuming electrode on a surface facing away from the catholyte space, a line for feeding gaseous oxygen into this gas space, a second cathode arranged in the catholyte space for generating hydrogen and at least one line for flushing the gas space with inert gas, makes the flexible use of electricity possible in a process in which gaseous oxygen is fed to the oxygen-consuming electrode when there is a low supply of electricity and the oxygen is reduced when there is a first cell voltage at the oxygen-consuming electrode and no oxygen is fed to the oxygen-consuming electrode when there is a high supply of electricity and hydrogen is generated at the second cathode when there is a second cell voltage that is higher than the first cell voltage.