US 12,421,611 B2
Electrolysis arrangement for alkaline electrolysis
Jean-Philippe Tadiello, Frankfurt am Main (DE); and Nga Thi Quynh Do, Frankfurt am Main (DE)
Assigned to L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude, Paris (FR)
Filed by L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude, Paris (FR)
Filed on Apr. 8, 2022, as Appl. No. 17/716,573.
Claims priority of application No. 21020193 (EP), filed on Apr. 9, 2021.
Prior Publication US 2022/0325423 A1, Oct. 13, 2022
Int. Cl. C25B 1/04 (2021.01); C25B 15/08 (2006.01)
CPC C25B 1/04 (2013.01) [C25B 15/083 (2021.01); C25B 15/087 (2021.01)] 13 Claims
OG exemplary drawing
 
1. An electrolysis arrangement, comprising;
an electrolysis stack, wherein
the electrolysis stack is supplied with a direct current for the electrochemical production of hydrogen and oxygen from an alkaline electrolyte, the direct current having a current density, and
the electrolysis stack comprises an anode section and a cathode section,
an anode separator for the separation of oxygen from the electrolyte,
a cathode separator for the separation of hydrogen from the electrolyte,
an anode pipe system to circulate electrolyte between the anode section of the electrolysis stack and the anode separator,
a cathode pipe system to circulate electrolyte between the cathode section of the electrolysis stack and the cathode separator,
a first connecting pipe which interconnects the anode pipe system and the cathode pipe system, wherein a first control valve is arranged within the first connecting pipe,
a second control valve arranged within an anolyte pipe system or arranged within a catholyte pipe system,
a second connecting pipe which interconnects the anode pipe system and the cathode pipe system and which is arranged downstream to the first connecting pipe, the first control valve and the second control valve, wherein the second connecting pipe comprises a third control valve,
wherein the first connecting pipe, the second connecting pipe, the first control valve, the second control valve and the third control valve are arranged downstream to the anode separator and the cathode separator and upstream to the electrolysis stack, and
wherein the first control valve, the second control valve, the third control valve, the first connecting pipe and the second connecting pipe are configured so that dependent on an electrolyte flow rate passing the first control valve, the second control valve and the third control valve, an oxygen depleted electrolyte withdrawn from the anode separator and a hydrogen depleted electrolyte withdrawn from the cathode separator are supplied unmixed, partly mixed or fully mixed to the anode section of the electrolysis stack and the cathode section of the electrolysis stack.