Fuel Cell Module Combustion Chamber Segmentation
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Solution Overview
Problem
In fuel cell modules, the efficient combustion of unconsumed fuel and oxygen-containing exhaust gases in the exhaust gas combustion chamber is hindered by rapid discharge and cooling, leading to incomplete combustion reactions and reduced heat energy utilization.
Innovation Solution
The fuel cell module design includes a reformer and evaporator adjacent to each other, with the exhaust gas combustion chamber having a first chamber facing the evaporator with clearance and a second chamber sharing a common wall with the reformer, allowing for a larger combustion chamber volume and maintaining high temperatures to facilitate complete combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the exhaust gas combustion chamber has a small volume, then the device complexity is reduced, but the combustion is incomplete due to rapid discharge and cooling
Solution Approach 1:
The exhaust gas combustion chamber is divided into a first chamber and a second chamber that are connected. The first chamber receives combustion exhaust gas from the combustor, while the second chamber facilitates heat exchange with the reformer. This segmentation allows the system to maintain compact overall dimensions while providing sufficient volume and residence time for complete combustion in the first chamber, and effective heat utilization in the second chamber.
2Reliability
If the combustion chamber volume is increased, then complete combustion is achieved, but the device complexity and space requirements increase
Solution Approach 1:
The exhaust gas combustion chamber is merged with the reformer by making at least part of the wall forming the second chamber a common wall shared with the reformer. This integration allows the combustion chamber to effectively utilize the space occupied by the reformer, reducing the overall volume requirement while maintaining sufficient combustion volume. The reformer and combustion chamber share thermal energy, further optimizing the compact design.
Solution Approach 2:
The first chamber and second chamber are nested within the overall module structure, with the combustion chamber positioned to face both the evaporator and reformer. This nested arrangement allows the combustion chamber to be embedded within the existing thermal processing components, maximizing space utilization and minimizing the overall device volume while maintaining complete combustion capability.
3Volume of moving object
If the evaporator and reformer are positioned close together, then space is optimized, but heat transfer efficiency may be compromised
Solution Approach 1:
The design applies different spatial relationships to different components: the first chamber faces the evaporator with clearance to prevent direct thermal interference, while the second chamber shares a common wall with the reformer to maximize heat transfer. This localized optimization of spacing and thermal coupling ensures that heat transfer efficiency is maintained where needed (second chamber-reformer interface) while preventing unwanted thermal effects where inappropriate (first chamber-evaporator interface).
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 configuration ensures complete combustion of fuel and oxygen-containing exhaust gases, effectively suppressing rapid discharge and cooling, thereby enhancing heat energy production and utilization within the module.
Implementation Method 1
a combustor configured to combust the fuel exhaust gas and the oxygen-containing exhaust gas inside an exhaust gas combustion chamber to produce a combustion exhaust gas
Implementation Method 2
an evaporator configured to evaporate water to produce the water vapor supplied to the reformer
Implementation Method 3
a reformer configured to reform a raw fuel chiefly containing hydrocarbon using water vapor, and produce the fuel gas supplied to the fuel cell
Implementation Method 4
While heat exchange is performed between the combustion exhaust gas discharged from the combustion chamber outlet and the reformer, the combustion exhaust gas flows inside the casing
Data Source
AI summary
A reformer and an evaporator of a fuel cell module are provided adjacent to each other. An exhaust gas combustion chamber which combusts a fuel exhaust gas and an oxygen-containing exhaust gas discharged from a fuel cell to produce a combustion exhaust gas includes a first chamber and a second chamber connected to each other, and a combustion chamber outlet for discharging the combustion exhaust gas in the exhaust gas combustion chamber. At least part of an outer wall surface of the first chamber faces the evaporator with clearance. At least part of a wall forming the second chamber is a common wall shared with the reformer.