Modular Fuel Cell Layout for Off-Gas Water Condensation
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Solution Overview
Problem
Conventional fuel cell systems face challenges in efficiently reducing water vapor content in recirculated fuel off-gas and require a compact design to accommodate multiple power generation modules, leading to inefficiencies in power generation and system size.
Innovation Solution
A fuel cell system design featuring a modular structure with aligned power generation modules, integrated fuel and oxidant supply systems, and condensed water tanks positioned below the modules, utilizing heat exchangers to condense water vapor and recirculate fuel gas efficiently, with optimized pipe routing and centralized control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel off-gas is cooled by a heat exchanger and recirculated to improve power generation efficiency, then water vapor content in recirculated fuel gas is reduced, but system complexity increases due to additional components and piping
Solution Approach 1:
The patent combines the heat exchanger and condensed water tank into an integrated assembly where the tank is positioned to receive condensed water directly from the heat exchanger. This merging reduces the number of separate components and simplifies the overall system structure while maintaining the water vapor removal function that improves power generation efficiency.
Solution Approach 2:
The condensed water tank is positioned below the heat exchanger in the vertical dimension, utilizing gravitational force for natural drainage of condensed water. This spatial arrangement in another dimension eliminates the need for additional pumps or complex drainage piping, reducing system complexity while effectively removing water vapor from recirculated fuel gas.
2Power
If multiple power generation modules are coupled to increase system output, then power generation capacity is improved, but system size increases
Solution Approach 1:
The patent divides the fuel cell system into multiple independent power generation modules, each with its own fuel supply system and circulation system. This segmentation allows for modular scaling where additional modules can be added to increase power output without proportionally increasing the volume of auxiliary systems, as each module operates independently with shared infrastructure.
Solution Approach 2:
The patent designs universal components such as a common frame structure that supports multiple power generation modules, and shared fuel supply and circulation systems that serve multiple modules. This multi-functionality allows the system to achieve higher power output through module coupling while minimizing the proportional increase in overall system size through standardized, multi-purpose components.
3Ease of operation
If condensed water tanks are positioned below power generation modules to utilize gravity for water drainage, then ease of operation is improved, but installation space requirements increase
Solution Approach 1:
The patent positions the condensed water tank in the vertical space below the power generation module, nesting it within the overall system footprint. This nesting approach utilizes the vertical dimension rather than requiring additional horizontal space, allowing gravity-assisted water drainage to function effectively while maintaining a compact installation footprint.
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
The system effectively reduces water vapor in recirculated fuel gas, improves power generation efficiency, and achieves a compact design suitable for large power outputs while reducing costs through standardized components and simplified maintenance.
Implementation Method 1
a plurality of condensed water tanks that store condensed water generated in each of the heat exchangers
Implementation Method 2
a plurality of power generation modules each including a fuel cell stack, the fuel cell stack generating power with fuel gas supplied to an anode and oxidant gas supplied to a cathode
Data Source
AI summary
A fuel cell system including power generation modules each including a fuel cell stack and a module case, the fuel cell stack generating power by supplying fuel gas to an anode and oxidant gas to a cathode, the module case insulating and housing the fuel cell stack; fuel supply systems including fuel supply lines that each supply the fuel gas to corresponding one of the power generation modules; circulation systems including recirculation lines, respectively, each of the recirculation lines causing fuel off-gas discharged from corresponding one of the power generation modules to pass through corresponding one of heat exchangers and then recirculated to corresponding one of the fuel supply lines; condensed water tanks storing condensed water from the heat exchangers; and a frame supporting the power generation modules, the fuel supply systems, and the condensed water tanks, the of condensed water tanks are below the power generation modules.