Fuel Cell Humidifier Membrane Layout for Low Pressure Drop
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Solution Overview
Problem
Conventional humidification systems for fuel cells face inefficiencies due to dense packing of hollow fiber membranes, leading to reduced air penetration and humidification rates, high manufacturing costs, and issues with flooding and increased blower load, particularly when using Nafion membranes.
Innovation Solution
A humidification system with hollow fiber membranes of different species, where high-humidification-performance Nafion membranes are arranged in the center and low-humidification-performance membranes like polyetherimide or polyphenylsulfone are on the outside, optimizing air flow and reducing water absorption, thus maintaining efficiency and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hollow fiber membranes are densely packed to increase humidification capacity, then humidification performance is improved, but air penetration and diffusion rates are reduced
Solution Approach 1:
The patent applies local quality by creating two distinct zones within the hollow fiber membrane bundle: a center region with lower packing density for improved air penetration and diffusion, and an outer region with higher packing density for maximum humidification capacity. This spatial differentiation of membrane arrangement allows each zone to optimize its function - the center zone facilitates air flow while the outer zone provides extensive surface area for water transfer.
2Productivity
If Nafion membranes are used for high humidification performance, then humidification efficiency is improved, but manufacturing cost and susceptibility to flooding increase
Solution Approach 1:
The patent applies local quality by selectively placing Nafion membranes only in the center region of the hollow fiber membrane bundle where they can provide enhanced humidification efficiency for the primary air flow path. The outer region uses alternative membrane materials that are more cost-effective and less prone to flooding, thereby reducing overall manufacturing costs while maintaining high humidification performance where it is most needed.
Solution Approach 2:
The patent applies composite materials by combining different types of hollow fiber membranes (Nafion and alternative materials) within the same membrane bundle. This composite structure allows the system to leverage the superior humidification properties of Nafion in the center region while using more economical and flood-resistant materials in the outer region, achieving a balance between performance and cost-effectiveness.
3Productivity
If Nafion membranes absorb water, then humidification performance is improved, but pressure drop and blower load increase
Solution Approach 1:
The patent applies local quality by concentrating water-absorbing Nafion membranes in the center region where they can effectively humidify the main air flow. The outer region uses membranes with different properties that do not absorb excessive water, thereby maintaining lower pressure drop characteristics. This spatial differentiation allows the system to achieve high humidification performance while minimizing the overall pressure drop and blower load.
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 enhances humidification performance, reduces pressure drop and blower load, and minimizes flooding, while using less expensive materials, thereby improving the overall efficiency and durability of the fuel cell system.
Implementation Method 1
water in the wet air is separated by capillary action of the respective hollow fiber membranes 106
Data Source
AI summary
The present invention provides a humidification system with membranes of different species, in which a material having a high humidification performance and capable of being swollen with water is arranged in the center of a hollow fiber membrane bundle disposed in a hollow fiber membrane module and a material that is not swollen with water is disposed on the outside thereof. Accordingly, using the humidification system of the invention, it is possible to provide the same level of humidification performance as the existing humidification system, manufacture the humidification system at low cost, and solve various problems such as a flooding phenomenon of a fuel cell stack and an increase in load on an air blower.