Solid oxide fuel cell system and method for operating the same

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This patent describes a solid oxide fuel cell (SOFC) system and a method for operating it more efficiently by monitoring and controlling the recirculation of exhaust gas from the anode side. Instead of relying on complex or potentially error-prone mass flow measurements, the invention introduces a system where volumetric flows of both recirculated and discharged exhaust gases are measured at select points, allowing accurate determination of the recirculation ratio. This streamlined measurement approach enables better fuel utilization and water management, which improves the fuel cell's overall performance and operational reliability.

Use CasesContent extracted from patent full text and abstract with AI.

• Residential and commercial energy generation using solid oxide fuel cells.
• Industrial combined heat and power (CHP) systems seeking higher efficiency from their fuel cell operations.
• Power generation on vehicles (e.g., trains, ships, or trucks) using SOFC technology for onboard electricity production.
• SOFC systems in microgrids or backup power applications where operational efficiency and reliability are critical.
• Advanced SOFC stacks in research or pilot plants, where precise operational control is needed.

BenefitsContent extracted from patent full text and abstract with AI.

• Improved accuracy and reliability in determining the recirculation ratio of exhaust gases, leading to optimized fuel and water usage.
• Simplified measurement requirements, reducing complexity, cost, and maintenance of the monitoring system.
• Enhanced efficiency and durability of the SOFC system by preventing issues like carbon deposition (soot) or fuel over-dilution.
• Operational flexibility across varying system loads without the need for recalibrating instruments for different gas compositions or temperatures.
• Potential for extended SOFC system lifetime and lower operating costs due to more stable and controlled operation.

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Patent Abstract

The method involves supplying fuel to an anode side and discharging anode exhaust gas on the anode side. A partial stream of the anode exhaust gas is fed back to anode side as a recirculation gas and remaining partial stream is discharged as exhaust gas. The measuring devices are arranged to measure the volumetric flows of discharged anode exhaust gas and recirculated anode exhaust gas respectively so as to determine the ratio of recirculated exhaust gas with respect to total amount of exhaust gas. An independent claim is included for solid oxide fuel cell.