Dual-Layer Air Filter for Fuel Cell Gas and Particle Removal
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Solution Overview
Problem
Existing fuel cell systems face challenges in effectively removing both particulate and gaseous contaminants, such as nitrogen oxides, sulfur dioxide, and ammonia, which can reduce fuel cell performance and lifespan by adhering to electrodes.
Innovation Solution
A filter device with a dual-layer structure comprising a filtering layer for particle removal and an adsorbing layer for gas adsorption, using activated carbon and additional adsorbents, is designed to purify air for fuel cells, ensuring unobstructed airflow and selective adsorption of harmful gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single filter medium is used for both particle filtration and gas adsorption, then device complexity is reduced, but filtration and adsorption performance cannot be optimized separately
Solution Approach 1:
The filter medium is divided into two distinct functional layers: a filtration layer for particle removal and an adsorption layer for gas contaminant removal. This segmentation allows each layer to be optimized for its specific function while working together in a unified filter element, resolving the contradiction between structural simplicity and functional performance.
Solution Approach 2:
Different regions of the filter medium are assigned different functional properties - the filtration layer has properties optimized for particle capture while the adsorption layer has properties optimized for gas adsorption. This local differentiation enables each zone to perform its specific function effectively without compromising the other.
2Ease of manufacture
If filtration and adsorption functions are combined in one layer, then manufacturing is simplified, but both functions cannot be optimized simultaneously
Solution Approach 1:
The filter element is manufactured as two separate layers that can be produced using different manufacturing processes optimized for each function, then assembled together. This approach maintains manufacturing simplicity while enabling each layer to be optimized for its specific performance requirements.
Solution Approach 2:
The filtration layer and adsorption layer are combined into a single integrated filter element with defined spatial relationships between layers. This merging provides the functional benefits of both separate optimized layers while maintaining a compact, manufacturable structure.
3Quantity of substance
If the filter mat is made thicker to improve adsorption capacity, then gas adsorption improves, but airflow resistance increases
Solution Approach 1:
The filter structure utilizes a three-dimensional layered configuration where the filtration layer and adsorption layer are stacked in sequence along the airflow path. This dimensional arrangement allows both layers to provide their full functional capacity without requiring excessive thickness in any single layer, balancing adsorption capacity with airflow resistance.
Solution Approach 2:
Both the filtration layer and adsorption layer utilize porous material structures that provide high surface area for particle capture and gas adsorption respectively, while maintaining sufficient porosity to allow airflow through the combined thickness of both layers without excessive resistance.
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 filter device effectively removes particles and adsorbs harmful gases, preventing electrode damage and performance degradation, thus enhancing fuel cell efficiency and longevity.
Implementation Method 1
one functional layer (14) serves for filtration
Implementation Method 2
the other downstream functional layer (16) for adsorption... the adsorbing layer adsorbs both basic and acidic pollutants from the air
Data Source
Figure 1
Figure 2~4
AI summary
2. Filter device for air, in particular in the form of cathode air, at least consisting of a hollow cylindrical filter element (10), the filter mat (12) of which is formed from at least two functional layers (14, 16), of which on the upstream side (18) one functional layer (14) serves for filtration and the other on the downstream side (20) functional layer (16) serves for adsorption.