Regenerative Fuel Cell Pressure Control for Membrane Protection
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Solution Overview
Problem
The high-pressure gas generated during the pressurization-stop operation in a regenerative fuel cell system can cause blisters and deterioration in the electrolyte membrane, posing a risk to the water electrolysis apparatus.
Innovation Solution
A regenerative fuel cell system with a control apparatus that adjusts the flow rate of a flow regulating valve based on pressure to achieve a target depressurization rate, ensuring stable gas supply to the fuel cell and preventing membrane damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high-pressure gas is supplied to the fuel cell during pressurization-stop operation, then gas utilization efficiency is improved, but the electrolyte membrane deteriorates and blisters form
Solution Approach 1:
The patent applies dynamics by making the flow rate of gas supply adjustable rather than fixed. The control apparatus dynamically changes the flow rate based on the operational state (pressurization vs. pressurization-stop), allowing the system to adapt to different pressure conditions and prevent membrane damage while maintaining gas utilization efficiency.
Solution Approach 2:
The patent changes the flow rate parameter of gas supply based on pressure conditions. During pressurization-stop operation, the flow rate is reduced to a specific range (0.01-0.1 times the pressurization operation flow rate), which controls the depressurization rate and prevents electrolyte membrane deterioration while still utilizing the generated gas.
2Power
If gas flow rate is increased to supply more gas to the fuel cell, then power generation output is improved, but pressure control precision deteriorates
Solution Approach 1:
The patent implements feedback control where the control apparatus monitors the flow rate and adjusts it based on the operational state and pressure conditions. The flow rate is feedback-controlled to maintain appropriate pressure levels while ensuring sufficient gas supply for power generation, resolving the conflict between power output and pressure control precision.
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 system effectively prevents blisters and deterioration of the electrolyte membrane, maintaining stable power generation and reducing moisture-related issues.
Implementation Method 1
a pressure sensor configured to detect pressure of the gas supplied to the gas supply path
Implementation Method 2
a fuel cell configured to generate power through an electrochemical reaction between oxygen gas and hydrogen gas
Implementation Method 3
a flow regulating valve provided in the gas supply path
Data Source
AI summary
A regenerative fuel cell system includes a supply mechanism for supplying gas generated by a pressurization apparatus to a fuel cell, and a control apparatus. The supply mechanism includes a flow regulating valve provided in a gas supply path, and a pressure sensor that detects pressure of the gas supplied to the gas supply path. When a pressurization-stop operation is started, the control apparatus adjusts the flow rate of the flow regulating valve to realize a target depressurization rate, and causes the fuel cell to generate power corresponding to the flow rate.