Fuel Cell Airflow Compensation for Hydrogen Off-Gas Diffusion
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Solution Overview
Problem
Existing fuel cell systems face issues with deterioration of output performance and degradation of durability due to improper air supply rates, often resulting in lower oxygen concentration or higher hydrogen concentration, which are not adequately addressed by conventional air flow rate control methods.
Innovation Solution
A method and device for controlling air flow rate compensation by determining the amount of hydrogen off-gas discharged and diffused into the humidifier, adjusting the target air flow rate based on oxygen concentration reduction, and compensating for the change in oxygen concentration to maintain optimal air supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air is supplied at the target air flow rate determined experimentally, then the air supply amount is controlled, but the oxygen concentration is lowered and hydrogen concentration is increased, causing deterioration of output performance and degradation of durability
Solution Approach 1:
The control device calculates the diffusion amount of hydrogen off-gas into the air supply unit based on the opening degree of the fuel discharge valve, and adjusts the target air flow rate accordingly. This feedback mechanism ensures that the actual oxygen concentration and hydrogen concentration in the supplied air remain within acceptable ranges, preventing deterioration of output performance and degradation of durability while maintaining effective air supply control.
2Reliability
If the target air flow rate is increased to maintain oxygen concentration, then the air supply amount is increased, but energy consumption increases
Solution Approach 1:
The control device dynamically adjusts the target air flow rate parameter based on the calculated diffusion amount of hydrogen off-gas. Instead of maintaining a fixed high air flow rate, the system optimizes the air flow rate in real-time according to the actual hydrogen discharge conditions, thereby maintaining oxygen concentration while minimizing unnecessary energy consumption.
3Use of energy by moving object
If the target air flow rate is decreased to reduce energy consumption, then energy consumption is reduced, but oxygen concentration is further lowered and hydrogen concentration is increased
Solution Approach 1:
The control device uses feedback from the fuel discharge valve opening degree to calculate the diffusion amount of hydrogen off-gas and adjusts the target air flow rate accordingly. This ensures that the air flow rate is sufficient to maintain acceptable oxygen and hydrogen concentrations while avoiding excessive energy consumption, achieving an optimal balance between energy efficiency and gas concentration control.
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
Prevents deterioration in fuel cell output performance and durability by optimizing air flow rates, improving hydrogen concentration management and enhancing overall system efficiency.
Implementation Method 1
determining a fuel diffusion amount per unit time, wherein the fuel diffusion amount corresponds to an amount of hydrogen off-gas discharged through the fuel discharge valve and then diffused into an air supply unit through a humidifier
Data Source
AI summary
A device for controlling compensation for an air flow rate upon discharge of hydrogen off-gas and a method for controlling compensation for an air flow rate using the same is an air flow rate control device configured to control a flow rate of air supplied to a fuel cell cathode through an air supply unit of a fuel cell system, wherein the air flow rate control device is configured to determine whether a fuel discharge valve of the fuel cell system is opened and determine a fuel diffusion amount per unit time, wherein the fuel diffusion amount corresponds to an amount of the hydrogen off-gas discharged through the fuel discharge valve and diffused into an air supply unit through a humidifier, and compensate a target air flow rate depending on an oxygen concentration reduction proportion, determined according to the determined fuel diffusion amount per unit time and flow rate information of the air supply unit.