Fuel Cell Anode Gas Purification via Circulation Filter
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Solution Overview
Problem
Closed-end hydrogen fuel cells have a short operating life due to impurity enrichment in the anode gas space, which is not effectively addressed by existing methods that increase hydrogen purity, leading to increased manufacturing and distribution costs.
Innovation Solution
A filter is integrated into the anode or cathode circulation line of the fuel cell to continuously remove impurities, using a regenerable filter that can be heated for regeneration, allowing for efficient and cost-effective purification of the gas, particularly for impurities like H2S, SO2, NOx, and VOC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the degree of cleanliness of feed hydrogen is increased, then the operating life of the fuel cell is improved, but the manufacturing and distribution costs increase
Solution Approach 1:
The filter is installed in the circulation line to remove impurities before they can accumulate to harmful levels in the anode gas space. This preliminary cleaning action prevents impurity enrichment that would otherwise occur during normal operation, extending operating life without requiring ultra-pure feed hydrogen
Solution Approach 2:
The filter extracts and removes impurities (H2S, SO2, NOx, VOC) from the circulating anode gas stream. By taking out these harmful substances continuously during operation, the system prevents their accumulation and maintains acceptable operating conditions without needing highly purified feed gas
2Productivity
If fuel utilization is maximized in a closed-end fuel cell, then the efficiency is improved, but impurity enrichment in the anode gas space occurs
Solution Approach 1:
The filter operates continuously during fuel cell operation, continuously removing impurities from the circulating anode gas. This continuous cleaning action maintains low impurity levels even as fuel utilization is maximized, preventing the impurity enrichment that would normally occur in closed-end cells
Solution Approach 2:
The filter acts as an intermediary between the anode reaction space and the circulation system. It mediates the impurity accumulation problem by intercepting and removing harmful substances from the gas circulation, allowing high fuel utilization without impurity enrichment
3Reliability
If a regenerative filter is used in the circulation line, then the impurity removal effectiveness is improved, but the device complexity increases
Solution Approach 1:
The filter is designed to be regenerated periodically rather than replaced continuously. This periodic regeneration approach maintains high impurity removal effectiveness while avoiding the complexity of continuous filtration systems or frequent filter replacements, simplifying the overall device architecture
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 solution prolongs the operating life of the fuel cell by maintaining low impurity levels, reducing costs significantly compared to traditional methods, and can be applied to both anode and cathode sides, ensuring efficient fuel utilization and extended cell lifespan.
Implementation Method 1
A filter is integrated into the anode or cathode circulation line of the fuel cell to continuously remove impurities
Implementation Method 2
A filter is added to a circulation line of the anode side of the fuel cell. The filter is intended to remove enriched impurities from the anode gas circulation
Implementation Method 3
using a regenerable filter that can be heated for regeneration
Data Source
Figure 1
AI summary
The invention relates to a system and method for reducing impurities on the anode or cathode side of a fuel cell. The system comprises the anode or cathode of a fuel cell, a fuel or oxidizer feed line for feeding fuel or oxidizer to the anode or cathode respectively, and a circulation line connected to the fuel or oxidizer feed line for circulating part of the fuel or oxidizer through it. According to the invention, at least one filter for removing impurities in the fuel or oxidizer is arranged in the circulation line. With the aid of the invention, enriched impurities in the circulation can be cost-effectively removed, in order to increase the operating life of the fuel cell.