US 12,331,413 B2
Method for supplying oxygen-enriched gas to an oxygen-consuming process
Bengt Peter Gustav Blennow, Humlebæk (DK); Rainer Küngas, Harjumaa (EE); Jeppe Rass-Hansen, København V (DK); Tobias Holt Nørby, Glostrup (DK); Thomas Heiredal-Clausen, Birkerød (DK); Poul Georg Moses, Birkerød (DK); and John Bøgild Hansen, Humlebæk (DK)
Assigned to TOPSOE A/S, Kgs. Lyngby (DK)
Appl. No. 17/795,763
Filed by TOPSOE A/S, Kgs. Lyngby (DK)
PCT Filed Feb. 5, 2021, PCT No. PCT/EP2021/052839
§ 371(c)(1), (2) Date Jul. 27, 2022,
PCT Pub. No. WO2021/156457, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. PA 2020 00154 (DK), filed on Feb. 6, 2020.
Prior Publication US 2023/0069515 A1, Mar. 2, 2023
Int. Cl. C25B 15/00 (2006.01); C25B 1/02 (2006.01); C25B 1/042 (2021.01); C25B 1/23 (2021.01); C25B 9/19 (2021.01); C25B 13/07 (2021.01); C25B 15/02 (2021.01); C25B 15/08 (2006.01)
CPC C25B 15/081 (2021.01) [C25B 1/02 (2013.01); C25B 1/042 (2021.01); C25B 1/23 (2021.01); C25B 9/19 (2021.01); C25B 13/07 (2021.01); C25B 15/02 (2013.01); C25B 15/087 (2021.01)] 19 Claims
OG exemplary drawing
 
1. A method for supplying oxygen-enriched gas to an oxygen-consuming process that is an oxy-calcining process, in which at least one operating solid oxide electrolysis cell is provided having a cathode side and an anode side, and
a) a cathode-side feed gas stream comprising steam or CO2 or a mixture thereof is supplied to the cathode side of the at least one solid oxide electrolysis cell,
b) at least part of the cathode-side feed gas stream is electrochemically reduced in the solid oxide electrolysis cell, thereby forming a cathode-side product gas stream that is enriched in hydrogen, carbon monoxide or a mixture thereof,
c) at least part of the cathode-side product gas stream is supplied to a hydrogen- and/or carbon monoxide-consuming process,
d) an anode-side feed gas stream comprising CO2 is supplied to the anode side of the solid oxide electrolysis cell, and
e) oxygen is electrochemically generated on the anode side of the solid oxide electrolysis cell, thereby forming an anode-side product gas stream enriched in oxygen, wherein an oxygen-enriched gas comprising at least part of the anode-side product gas stream enriched in oxygen is fed to the oxygen-consuming process,
the oxygen-enriched gas has a low nitrogen content, the content of nitrogen being below 10 vol %, and
the oxygen-enriched gas exiting the solid oxide electrolysis cell has a temperature in the range of between 600° C. and 1000° C.,
wherein a stream of solid material comprising calcium carbonate is fed to the oxy-calcining process.