Fuel Cell Stack Impurity Removal and Localized Cooling
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Solution Overview
Problem
Fuel cells face efficiency and operational challenges due to impurity accumulation and localized overheating, which reduces energy efficiency and can damage electrolyte membranes, requiring periodic shutdowns for cleaning and cooling that further lowers performance.
Innovation Solution
A fuel cell system with a controller that switches fuel and air supply directions using independent feeders and valves, coupled with temperature and load detection, allows for real-time impurity removal and localized cooling without stopping operations, enhancing energy efficiency and extending stack life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system stops periodically to remove impurities by supplying purge gas or washing the fuel electrode, then impurity accumulation is prevented, but operation time is shortened and energy efficiency is lowered
Solution Approach 1:
The patent implements continuous operation by eliminating the need for periodic shutdowns. The fuel electrode structure with its narrow and complicated flow path is designed to prevent impurity accumulation during continuous operation, allowing the system to maintain productivity while preventing impurity buildup through optimized fluid dynamics rather than periodic cleaning cycles
Solution Approach 2:
The patent applies different structural characteristics to different regions of the fuel electrode. The flow path is designed with varying width and complexity in different areas to create specific flow patterns that prevent impurity accumulation at critical locations, allowing continuous operation without shutdowns for cleaning
2Temperature
If the related art cooling device cools the entire stack, then cooling is provided, but the locally heated portion at the outlet side cannot be effectively cooled and non-heated portions are unnecessarily cooled
Solution Approach 1:
The patent implements localized cooling by providing cooling functions at specific locations where heat generation occurs. The cooling device is configured to target the outlet side of the air electrode where localized heating occurs due to the electrochemical reaction and continuous fluid flow, rather than cooling the entire stack uniformly
Solution Approach 2:
The system uses the reactants and products of the electrochemical reaction itself for cooling purposes. The air and water vapor flowing through the stack serve as cooling media, absorbing heat from the reaction zone and carrying it away, thereby providing self-cooling without requiring external cooling systems for the entire stack
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 removes impurities and maintains proper stack temperature, improving energy efficiency and preventing membrane damage, allowing continuous operation with enhanced performance and extended lifespan.
Implementation Method 1
the fuel cell supplies fuel (hydrogen gas or hydrocarbon) and oxygen to a fuel electrode (anode) and an air electrode (cathode), respectively, which form a stack, thereby arousing an electrochemical reaction between the hydrogen and the oxygen without a burning (oxidation) reaction. Then, an energy difference between before and after the electrochemical reaction is directly converted into electric energy.
Implementation Method 2
the fuel electrode has a narrow and complicated flow path to evenly disperse the supplied fuel to its entire area
Implementation Method 3
the fuel cell generates heat while hydrogen and oxygen as the fuel react with each other, and the temperature at the outlet side of the flow path (air electrode) becomes the highest due to the heat generated during the reaction and a continuous flow of fluid
Data Source
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AI summary
The present invention relates to a fuel cell and a method of operating the same, the fuel cell including a stack (100) having first and second fuel inlet/outlet ports (121a, 121b) and first and second air inlet/outlet ports (131a, 131b), a first fuel feeder (105), a second fuel feeder (106), a first air feeder (107), a second air feeder (108), a fuel switching unit (123a, 123b)(124, 124a, 124b, 124c)(125, 125a, 125b, 125c)(126a, 126b)(127a, 127b)(128, 128a, 128b, 128c)(129, 129a, 129b, 129c) provided between the first fuel feeder and the second fuel feeder to switch a fuel supply direction from the first fuel feeder to the second fuel feeder or to a reverse direction, and an air switching unit (133a, 133b)(134, 134a, 134b, 134c)(135, 135a, 135b, 135c)(136a, 136b)(137a, 137b)(138, 138a, 138b, 138c)(139, 139a, 139b, 139c) provided between the first air feeder and the second air feeder to switch an air supply direction from the first air feeder to the second air feeder or to a reverse direction, whereby removal of impurities accumulated in the stack can be simplified and overheating of the stack can be prevented, thereby improving stack performance.