Electrochemical system

Patent metadata

Field	Value
Publication number	US-2025146140-A1
Application number	US-202418443543-A
Country	US
Kind code	A1
Filing date	Feb 16, 2024
Priority date	Nov 6, 2023
Publication date	May 8, 2025
Grant date	—

Abstract

An embodiment of an electrochemical system includes a reaction fluid supply line configured to supply a reaction fluid, a first gas-liquid separator connected to the reaction fluid supply line and configured to separate the reaction fluid into a gaseous reaction fluid and a liquid reaction fluid, a circulation line connected to the first gas-liquid separator and configured to allow the liquid reaction fluid to circulate therethrough, a water electrolysis stack provided in the circulation line, and a first bypass line having a first end at an upstream side of the water electrolysis stack and connected to the circulation line, and a second end at a downstream side of the water electrolysis stack and connected to the circulation line.

First claim

What is claimed is:

1 . An electrochemical system comprising:
a reaction fluid supply line configured to supply a reaction fluid; a first gas-liquid separator connected to the reaction fluid supply line and configured to separate the reaction fluid into a gaseous reaction fluid and a liquid reaction fluid; a circulation line connected to the first gas-liquid separator and configured to allow the liquid reaction fluid to circulate therethrough; a water electrolysis stack provided in the circulation line; and a first bypass line having a first end at an upstream side of the water electrolysis stack and connected to the circulation line, and a second end at a downstream side of the water electrolysis stack and connected to the circulation line.

2 . The electrochemical system of claim 1 , further comprising a first circulation three-way valve provided in the circulation line and connected to the first end of the first bypass line.

3 . The electrochemical system of claim 2 , further comprising a first circulation ion sensor at the upstream side of the water electrolysis stack, provided in the circulation line, and configured to sense ionic conductivity of the liquid reaction fluid, wherein the first circulation three-way valve is configured to allow the liquid reaction fluid to selectively flow from the upstream side of the water electrolysis stack to the downstream side of the water electrolysis stack based on a sensing result from the first circulation ion sensor.

4 . The electrochemical system of claim 1 , further comprising a circulation filter positioned between the first gas-liquid separator and an inlet of the water electrolysis stack, provided in the circulation line, and configured to filter the liquid reaction fluid.

5 . An electrochemical system comprising:
a reaction fluid supply line configured to supply a reaction fluid; a first gas-liquid separator connected to the reaction fluid supply line and configured to separate the reaction fluid into a gaseous reaction fluid and a liquid reaction fluid; a circulation line connected to the first gas-liquid separator and configured to allow the liquid reaction fluid to circulate therethrough; a water electrolysis stack provided in the circulation line; a first bypass line having a first end at an upstream side of the water electrolysis stack and connected to the circulation line, and a second end at a downstream side of the water electrolysis stack and connected to the circulation line; and a filter part provided in the reaction fluid supply line and configured to filter the reaction fluid.

6 . The electrochemical system of claim 5 , wherein the filter part comprises:
a first filter line connected to the reaction fluid supply line and equipped with a first filter; and a second filter line connected in parallel with the first filter line, connected to the reaction fluid supply line, and equipped with a second filter.

7 . The electrochemical system of claim 6 , further comprising a filter three-way valve provided in the reaction fluid supply line and connected to one end of the first filter line and one end of the second filter line.

8 . The electrochemical system of claim 7 , further comprising:
a first filter ion sensor at a downstream side of the first filter, provided in the first filter line, and configured to sense ionic conductivity of the reaction fluid; and a second filter ion sensor at a downstream side of the second filter, provided in the second filter line, and configured to sense ionic conductivity of the reaction fluid, wherein the filter three-way valve is configured to selectively switch a movement route for the reaction fluid to the first filter line or the second filter line based on sensing results from the first filter ion sensor and the second filter ion sensor.

9 . An electrochemical system comprising:
a reaction fluid supply line configured to supply a reaction fluid; a first gas-liquid separator connected to the reaction fluid supply line and configured to separate the reaction fluid into a gaseous reaction fluid and a liquid reaction fluid; a circulation line connected to the first gas-liquid separator and configured to allow the liquid reaction fluid to circulate therethrough; a water electrolysis stack provided in the circulation line; a first bypass line having a first end at an upstream side of the water electrolysis stack and connected to the circulation line, and a second end at a downstream side of the water electrolysis stack and connected to the circulation line; a second bypass line at the downstream side of the water electrolysis stack and connected to the circulation line; a second gas-liquid separator connected to the second bypass line and configured to separate the liquid reaction fluid that flows along the second bypass line, into a gaseous reaction fluid and a liquid reaction fluid; and a recirculation line having a first recirculating end connected to the second gas-liquid separator, and a second recirculating end connected to the first gas-liquid separator, the recirculation line being configured to recirculate the liquid reaction fluid that has passed through the second gas-liquid separator, to the first gas-liquid separator.

10 . The electrochemical system of claim 9 , further comprising a second circulation three-way valve provided in the circulation line and connected to a first second-bypass end of the second bypass line.

11 . The electrochemical system of claim 10 , further comprising a second circulation ion sensor at the downstream side of the water electrolysis stack, provided in the circulation line, and configured to sense ionic conductivity of the liquid reaction fluid, wherein the second circulation three-way valve is configured to allow the liquid reaction fluid to selectively flow from the circulation line to the second bypass line based on a sensing result from the second circulation ion sensor.

12 . The electrochemical system of claim 9 , further comprising a third bypass line having a first third-bypass end connected to the recirculation line, and a second third-bypass end connected to the second gas-liquid separator.

13 . The electrochemical system of claim 12 , further comprising a recirculation three-way valve provided in the recirculation line and connected to the third bypass line.

14 . The electrochemical system of claim 13 , comprising a recirculation ion sensor provided in the recirculation line and configured to sense ionic conductivity of the liquid reaction fluid, wherein the recirculation three-way valve is configured to allow the liquid reaction fluid to selectively flow from the recirculation line to the third bypass line based on a sensing result from the recirculation ion sensor.

15 . The electrochemical system of claim 9 , further comprising a storage part at an upstream side of the first gas-liquid separator, provided in the reaction fluid supply line, and configured to store the reaction fluid.

16 . The electrochemical system of claim 15 , further comprising a first cleaning line having a first cleaning-line end connected to the storage part, and a second cleaning-line end connected to the second gas-liquid separator, the first cleaning line being configured to supply the reaction fluid to an inner wall surface of the second gas-liquid separator.

17 . The electrochemical system of claim 16 , further comprising:
a discharge line connected to the second gas-liquid separator and configured to discharge the liquid reaction fluid outside from the second gas-liquid separator; an on-off valve configu

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Han Hyo Kyung
• Jeong Kwi Seong
• Yang Won Seok

Classifications

• C25B9/73

  of the filter-press type · CPC title

• C25B15/085

  Removing impurities · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• B01D61/54

  Controlling or regulating · CPC title

• B01D61/46

  Apparatus therefor · CPC title