Anode exhaust processing for molten carbonate fuel cells
US-2020176795-A1 · Jun 4, 2020 · US
Operation of molten carbonate fuel cells with high electrolyte fill level
US11335937B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11335937-B2 |
| Application number | US-201916695356-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 26, 2019 |
| Priority date | Nov 26, 2019 |
| Publication date | May 17, 2022 |
| Grant date | May 17, 2022 |
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Abstract
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An elevated target amount of electrolyte is used to initially fill a molten carbonate fuel cell that is operated under carbon capture conditions. The increased target electrolyte fill level can be achieved in part by adding additional electrolyte to the cathode collector prior to start of operation. The increased target electrolyte fill level can provide improved fuel cell performance and lifetime when operating a molten carbonate fuel cell at high current density with a low-CO2 content cathode input stream and/or when operating a molten carbonate fuel cell at high CO2 utilization.
First claim
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The invention claimed is: 1. A method for producing electricity in a molten carbonate fuel cell comprising a lithium-containing electrolyte, the method comprising: operating a molten carbonate fuel cell comprising an anode, a matrix, and a cathode with a cathode input stream comprising 10 vol % or less of CO 2 at an average current density of 120 mA/cm 2 or more and a CO 2 utilization of 60% or more, the molten carbonate fuel cell further comprising a combined target electrolyte fill level of 70 vol % or more of a combined matrix pore volume and cathode pore volume. 2. The method of claim 1 , wherein operating the molten carbonate fuel cell comprises operating at a measured CO 2 utilization of 75% or more. 3. The method of claim 1 , wherein the cathode input stream comprises 5.0 vol % or less of CO 2 , or wherein a cathode exhaust comprises 2.0 vol % or less of CO 2 , or wherein the molten carbonate fuel cell is operated at a transference of 0.95 or less, or a combination of two or more thereof. 4. The method of claim 1 , wherein the electrolyte comprises a non-eutectic mixture, or wherein a lithium carbonate content of the electrolyte is greater than a corresponding eutectic composition by 10 wt % or more. 5. The method of claim 1 , wherein the current density is 150 mA/cm 2 or more. 6. The method of claim 1 , wherein the molten carbonate fuel cell is operated for a cumulative time of 50 hours or more. 7. The method of claim 1 , wherein a target cathode electrolyte fill level comprises 85 vol % to 140 vol % of the cathode pore volume. 8. The method of claim 1 , wherein the combined target electrolyte fill level is 85 vol % to 128 vol %. 9. The method of claim 1 , wherein at least a portion of the electrolyte is stored in a cathode collector.
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- What does patent US11335937B2 cover?
- An elevated target amount of electrolyte is used to initially fill a molten carbonate fuel cell that is operated under carbon capture conditions. The increased target electrolyte fill level can be achieved in part by adding additional electrolyte to the cathode collector prior to start of operation. The increased target electrolyte fill level can provide improved fuel cell performance and lifet…
- Who is the assignee on this patent?
- Exxonmobil Res & Eng Co, Fuelcell Energy Inc
- What technology area does this patent fall under?
- Primary CPC classification H01M8/145. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 17 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).