Thermally Coupled Fuel Cell Reformer System
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Solution Overview
Problem
Fuel cell systems face inefficiencies due to incomplete reforming at low temperatures, leading to unreformed fuel being lost and causing damage to the fuel cell, resulting in reduced energy conversion efficiency and shortened system lifespan.
Innovation Solution
A fuel cell system with thermally coupled reforming and a processing device that utilizes waste heat from the fuel cell stack to heat the reformer, allowing for efficient conversion of fuel and removing unreformed substances, thereby preventing damage and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If low-temperature reforming is used, then energy consumption is reduced, but reforming completeness deteriorates leading to unreformed fuel loss and fuel cell damage
Solution Approach 1:
The patent combines the reformer and fuel cell stack into a thermally coupled integrated system where the reformer is positioned within the fuel cell stack structure. This merging allows direct thermal coupling without external heating, enabling the reformer to utilize fuel cell waste heat while maintaining compact integration. The reformer and fuel cell share structural components and thermal pathways, resolving the contradiction between low energy consumption and high reforming completeness.
Solution Approach 2:
The patent converts the waste heat that would otherwise be lost from the fuel cell stack into a useful resource for driving the endothermic reforming reaction. By positioning the reformer to directly utilize the thermal field within the fuel cell stack, the system transforms harmful waste heat into beneficial process heat, achieving complete reforming without additional external energy input.
2Productivity
If external heating is used for reforming, then reforming efficiency is improved, but system complexity and external component requirements increase
Solution Approach 1:
The reformer is integrated within the fuel cell stack structure, merging two functional units into a single compact system. This integration eliminates the need for separate external heating devices and reduces system complexity while maintaining high reforming efficiency through direct thermal coupling. The reformer utilizes the inherent thermal field of the fuel cell stack without requiring additional external components.
3Device complexity
If unreformed fuel is not removed, then system complexity is reduced, but fuel cell lifespan is shortened due to damage from harmful substances
Solution Approach 1:
The patent implements preliminary cleaning of unreformed fuel through a condensation device positioned between the reformer and fuel cell anode. This preliminary removal of harmful substances prevents fuel cell damage before the gas enters the stack, extending fuel cell lifespan without requiring complex post-processing systems. The condensation device captures unreformed fuel and harmful substances in advance, protecting the fuel cell from exposure.
4Loss of energy
If thermally coupled reforming is implemented, then waste heat utilization is improved, but internal thermal management complexity increases
Solution Approach 1:
The reformer is positioned within the fuel cell stack structure, merging thermal management functions into a single integrated system. This merging allows direct utilization of the fuel cell's inherent thermal field without requiring separate thermal management subsystems. The reformer and fuel cell share thermal pathways and structural components, simplifying overall thermal management while maximizing waste heat utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the fuel cell system's efficiency by utilizing waste heat for reforming, reducing the need for external heating, and extending the system's lifespan by preventing harmful substances from entering the fuel cell stack.
Implementation Method 1
a reformer device (7) which is thermally coupled to the fuel cell stack (2)
Implementation Method 2
a processing device (8) for removing unreformed fuel and harmful substances from the reformate
Data Source
Figure 1~2
Figure 3a~4
Figure 5~8
AI summary
The present invention relates to a fuel cell system for internal, thermally coupled reforming with reformate preparation. This system includes a fuel cell stack have an anode inlet, an anode outlet, a cathode inlet and a cathode outlet. In addition, a reformer device, which is thermally coupled to the fuel cell stack, is provided for preparing an anode fluid that comprises reformed fuel, said reformer device being connected upstream of the anode inlet. A preparation device for removing non-reformed fuel and/or harmful substances from the anode fluid is arranged between the reformer device and the anode inlet.