ELECTROLYSIS ARRANGEMENT FOR ALKALINE ELECTROLYSIS

The invention relates to an electrolysis arrangement for the electrochemical production of hydrogen and oxygen from an alkaline electrolyte. The electrolysis arrangement comprises anode and cathode separators for the separation of oxygen and hydrogen from the electrolyte, and an anode and cathode pipe system to circulate electrolyte between anode and cathode sections of an electrolysis stack of the electrolysis arrangement. A first connecting pipe interconnects the anode pipe system and the cathode pipe system and comprises a first control valve. A second control valve is arranged within the anolyte pipe system or the catholyte pipe system. A second connecting pipe interconnects the anode pipe system and the cathode pipe system and comprises a third control valve. Said control valves and interconnections are configured so that dependent on an electrolyte flow rate passing the first, second and third control valve, oxygen and hydrogen depleted electrolyte withdrawn from the separators can be supplied unmixed, partly mixed or fully mixed to the anode and cathode sections of the electrolysis stack to control hydrogen to oxygen and oxygen to hydrogen crossover in the electrolysis arrangement.