Fuel Cell Module Purge Pressure Control to Block Hydrogen Backflow
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Solution Overview
Problem
In a multi-module fuel cell system, hydrogen purged from one fuel cell module can flow into another module through a shared discharge pipe, causing damage to the fuel cell stack due to hydrogen backflow.
Innovation Solution
A controller is used to determine the purge pressure of a fuel cell module requiring hydrogen purge and adjust the air discharge pressure of other modules connected via the discharge pipe, ensuring the air discharge pressure is equal to or higher than the purge pressure to prevent hydrogen backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple fuel cell modules share a single discharge pipe, then device complexity is reduced and ease of manufacture is improved, but hydrogen purged from one module can flow into another module causing durability degradation
Solution Approach 1:
The patent divides the common discharge pipe into multiple independent sections, each serving a specific fuel cell module. This segmentation prevents hydrogen purged from one module from flowing into another module through the discharge pipe, thereby maintaining system reliability while keeping the overall structure relatively simple.
Solution Approach 2:
The patent introduces a separator as an intermediary component within the discharge pipe system. This separator acts as a barrier between different fuel cell module discharge streams, preventing harmful hydrogen backflow while allowing the system to maintain a shared discharge infrastructure.
2Quantity of substance
If hydrogen purge is performed in one fuel cell module, then hydrogen concentration is reduced below predetermined level, but purged hydrogen may flow into other modules via shared discharge pipe causing serious damage
Solution Approach 1:
By segmenting the discharge pipe into module-specific sections with separators, the patent ensures that hydrogen purge operations in one module remain contained within that module's designated discharge path, preventing harmful hydrogen from affecting other modules while still achieving the desired hydrogen concentration reduction.
Solution Approach 2:
The separator structure is pre-configured in the discharge pipe to create preliminary protection against hydrogen backflow. This preventive structural measure is in place before any purge operation occurs, automatically blocking the path for harmful hydrogen to enter other modules.
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 prevents hydrogen purged from one fuel cell module from entering another, thereby enhancing the durability of the fuel cell stack by minimizing hydrogen backflow and associated damage.
Implementation Method 1
A fuel cell is a device that receives hydrogen and air from the outside and generates electrical energy through an electrochemical reaction in a fuel cell stack
Implementation Method 2
The air supply system operates an air compressor to supply suctioned outside air to a cathode (air electrode) of the fuel cell stack
Implementation Method 3
The fuel supply system depressurizes compressed hydrogen in a hydrogen tank and supplies the hydrogen to an anode (fuel electrode) of the fuel cell stack
Data Source
AI summary
A multi-module fuel cell system capable of preventing backflow of purged hydrogen may include a plurality of fuel cell modules each including an air compressor, an air inlet valve, an air outlet valve, and a fuel cell stack, a discharge pipe interconnecting air outlet portions of the plurality of fuel cell modules to allow at least one of air or hydrogen discharged from the plurality of fuel cell modules to flow therethrough, and a controller configured to determine whether at least one of the plurality of fuel cell modules requires hydrogen purge, to calculate a purge pressure of a fuel cell module requiring hydrogen purge, and to calculate an air discharge pressure of a remaining fuel cell modules based on the calculated purge pressure.