Two-Stage Fuel Cell Membrane Humidifier for Condensate Control
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Solution Overview
Problem
Current fuel cell membrane humidifiers face inefficiencies in maintaining optimal moisture levels, leading to degraded power generation efficiency, particularly in polymer electrolyte membrane fuel cells, as they rely on single-step humidification methods that can be ineffective and prone to condensate pooling and foreign material contamination.
Innovation Solution
A two-step humidification system incorporating a mid-case with a bypass inlet for partial off-gas bypass, a mixture humidification portion with activated carbon mesh, and hollow fiber membranes for moisture exchange, along with a condensate water storage and gasket assembly to absorb vibrations and prevent pooling, enhancing humidification efficiency and air filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-step humidification method is used, then the device structure is simple, but the humidification efficiency is insufficient and condensate pooling occurs
Solution Approach 1:
The humidification process is divided into two distinct steps: first, water vapor is supplied to the anode side through a membrane to humidify the membrane; second, the humidified air is then supplied to the cathode side. This segmentation of the humidification process into separate stages enables more effective moisture management while preventing condensate pooling that occurs in single-step methods.
2Reliability
If more moisture is supplied to the polymer electrolyte membrane, then power generation efficiency is maintained, but condensate pooling and foreign material contamination increase
Solution Approach 1:
A membrane is introduced as an intermediary component between the water source and the polymer electrolyte membrane. The membrane selectively supplies water vapor to the anode side through permeation, providing controlled moisture supply that maintains membrane hydration and power generation efficiency while preventing excessive moisture that would lead to condensate pooling and contamination.
3Adaptability or versatility
If a bypass flow path is added for partial off-gas bypass, then humidification control is improved, but device complexity increases
Solution Approach 1:
A bypass flow path is incorporated that allows dynamic control of off-gas flow distribution. The system can dynamically adjust between direct flow and bypass flow paths, enabling flexible control of humidification levels and adapting to varying operational conditions while maintaining a relatively simple overall structure.
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 two-step humidification system significantly improves moisture management, prevents condensate pooling, and removes foreign materials, thereby enhancing the overall efficiency of fuel cell membrane humidification and maintaining stable power generation.
Implementation Method 1
a selective permeable membrane used in the membrane humidification scheme is preferably a hollow fiber membrane having a large permeable area per unit volume
Implementation Method 2
at least one cartridge disposed in the mid-case and configured to accommodate a plurality of hollow fiber membranes performing moisture exchange
Implementation Method 3
a mesh structure made of activated carbon
Data Source
AI summary
The present invention relates to a fuel cell membrane humidifier capable of improving humidification efficiency by performing two-stage humidification, and a fuel cell system comprising same. A fuel cell membrane humidifier according to an embodiment of the present invention comprises: a dry air supply means; a fuel cell membrane humidifier which performs two-stage humidification on the dry air supplied from the dry air supply means; a fuel cell stack for generating energy and humid exhaust gas by reacting the humidified air supplied from the fuel cell membrane humidifier with hydrogen; and a bypass flow path for bypassing a portion of the exhaust gas generated in the fuel cell stack. The fuel cell membrane humidifier comprises: a mid-case; a cap which is fastened with the mid-case and has a bypass inlet connected to the bypass flow path; a mixing humidifier which performs mixed humidification by mixing the dry air introduced through the cap and the exhaust gas introduced through the bypass inlet; and at least one cartridge which is disposed in the mid-case and accommodates a plurality of hollow fiber membranes that perform moisture exchange.