Fuel Cell Humidifier Cartridge With Pressure-Linked Bypass Blocking
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Solution Overview
Problem
Conventional membrane humidifiers for fuel cells suffer from reduced efficiency due to high flow rates of off-gas bypassing without contact with hollow fiber membranes, leading to insufficient humidification of air supplied to the fuel cell stack, which lowers power generation efficiency.
Innovation Solution
A humidifier design featuring a mid-case with a blocking member and interlocking mechanism that reduces the flow rate of off-gas bypassing by ensuring the blocking member contacts the cartridge, even under pressure, thereby improving the humidification process efficiency and ensuring sufficient humidification of the gas supplied to the fuel cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional membrane humidifier design is used, then the structure is simple and manufacturing is easy, but the off-gas flow rate is too high causing bypass without contact with hollow fiber membranes, leading to insufficient humidification
Solution Approach 1:
The mid-case is divided into multiple segments (first mid-case segment, second mid-case segment, third mid-case segment) with blocking members positioned at different locations. This segmentation allows the off-gas flow to be controlled in stages, ensuring contact with hollow fiber membranes while maintaining manufacturing simplicity through modular construction.
Solution Approach 2:
Blocking members are introduced as intermediary elements between the off-gas flow and the hollow fiber membranes. These blocking members actively manage the gas flow rate, preventing bypass while ensuring sufficient contact time for humidification, thus resolving the contradiction between simple structure and effective humidification.
2Quantity of substance
If the off-gas flow rate is high, then the system can handle larger gas volumes, but the gas bypasses without contact with membranes, reducing power generation efficiency
Solution Approach 1:
The blocking members are designed to dynamically adjust to varying off-gas flow rates. As the flow rate increases, the blocking members effectively reduce the bypass path, maintaining optimal contact between the gas and membranes. This dynamic control ensures reliable power generation efficiency across different operating conditions while handling variable gas volumes.
Solution Approach 2:
Different regions of the mid-case are designed with different properties: the first segment handles high flow rate intake, the second segment with blocking members controls the flow rate to ensure membrane contact, and the third segment handles the humidified gas output. This local quality differentiation allows the system to handle large gas volumes while ensuring sufficient humidification for power generation efficiency.
3Productivity
If blocking members are added to control off-gas flow, then humidification efficiency improves, but device complexity increases
Solution Approach 1:
The blocking members are designed as simple structural elements integrated into the mid-case segments, using thin-walled constructions that are easy to manufacture. This approach improves humidification efficiency by controlling flow rates while minimizing the increase in device complexity through the use of simple, flexible structural designs rather than complex mechanical components.
4Stress or pressure
If the mid-case and inner case expand under pressure, then the blocking member may separate from the cartridge, but this increases the bypass flow rate and reduces humidification efficiency
Solution Approach 1:
The interlocking members are designed to engage the blocking member with the cartridge before pressure is applied. This preliminary action ensures that the blocking member is securely positioned to control off-gas flow rate. When pressure causes expansion, the interlocking mechanism maintains the connection, preventing separation and ensuring continuous effective humidification.
Solution Approach 2:
The interlocking mechanism combines multiple structural elements (interlocking members, blocking members, mid-case segments) into a composite assembly that distributes pressure loads. This composite structure prevents separation under pressure while maintaining the flow control function, ensuring humidification efficiency is maintained even under varying pressure conditions.
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 solution effectively reduces the flow rate of off-gas bypassing and enhances the humidification process, leading to improved power generation efficiency by ensuring dry gas is sufficiently humidified for the fuel cell stack.
Implementation Method 1
a membrane configured to selectively transmit only water vapor included in off-gas
Implementation Method 2
a blocking member protruding toward the cartridge between the inlet and the outlet, the blocking member being configured to contact the cartridge in order to block passage of wet gas
Implementation Method 3
an interlocking member configured to connect the inner case to the blocking member such that the blocking member and the inner case are moved in an interlocked state depending on pressure of wet gas located between the mid-case and the inner case
Data Source
AI summary
A cartridge of a fuel cell humidifier includes an inner case to be inserted into a middle case of the fuel cell humidifier for humidifying dry gas supplied from the outside using wet gas discharged from a fuel cell stack; a plurality of hollow-fiber membranes accommodated inside the inner case; a first potting part which is coupled to the inner case and which fixes one side of each of the hollow-fiber membranes; a second potting part which is coupled to the inner case and which fixes the other sides of the hollow-fiber membranes; and a link member for connecting the inner case to the middle case so that the middle case and the inner case are linked so as to move according to the pressure of the wet gas positioned inside the middle case.