Verfahren zum Transienten Betrieb eines Festoxid-Elektrolysezellenstapels

Details

Veröffentlichungs-Nr.

EP4123056

Aktenzeichen

EP21186582

Anmeldetag

20. Juli 2021

Veröffentlichung

17. Januar 2024

Erteilung

17. Januar 2024

Rechtsraum

EP

IPC

C25B1/042C25B3/26C25B9/77C25B15/08

Abstract

The invention relates to a method for transient operation of a solid oxide electrolysis cell (SOEC) stack having a cathode side and an anode side, the method comprising: supplying a flush gas comprising CO<2> to said anode side; and applying a small electrolysis current of 0.01-0.05 A/cm<2> active cell area to the cells in the SOEC stack, for thereby generating oxygen in the anode side or for transporting to the anode side any oxygen already available in the cathode side. The method comprises also operating the SOEC stack during shut-down with a flush gas comprising CO<2> on the anode side, and recycling anode product gas comprising oxygen being generated under prior normal operation of the SOEC stack, with no small current being applied. By the invention it is possible to generate small amounts of O<2> to safeguard the pO<2> and stability of the oxy-electrode in the anode side. The invention provides protection of not only the oxy-electrode, but also the fuel electrode in the cathode side.

Anmelder

Firma

Topsoe A/S

Land

🇩🇰 Dänemark

Fachgebiete