Fuel Cell Anode Filling via Hydrogen Compression
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Solution Overview
Problem
Fuel cell systems face challenges in quickly filling the anode side with hydrogen during start-up operations while minimizing hydrogen emissions, as existing methods are inefficient and result in increased operational costs and time due to back pressure and limited discharge valve capacity.
Innovation Solution
A method involving an anode sub-system that supplies hydrogen uniformly and simultaneously to the fuel cell stack, compressing any fluids into a volume between the active area and the anode exhaust manifold, eliminating the need for an anode discharge valve during start-up to prevent hydrogen emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a discharge valve is used to quickly fill the anode with hydrogen, then the filling speed is improved, but hydrogen emissions increase
Solution Approach 1:
The invention extracts and eliminates the discharge valve from the system during start-up operations. By removing this component that causes hydrogen emissions, the system achieves rapid anode filling without the harmful byproduct of hydrogen release to the atmosphere.
Solution Approach 2:
The invention converts the potential harm of trapped air in the anode into a benefit by using it as a compression medium. The air initially present in the anode is compressed into a reduced volume, which facilitates rapid hydrogen filling without requiring a discharge valve that would emit hydrogen.
2Speed
If a manifold purge valve is used to fill the anode supply manifold with hydrogen, then the manifold is filled, but hydrogen is emitted to the atmosphere increasing operational cost and startup time
Solution Approach 1:
The invention extracts and eliminates the manifold purge valve from the system. By removing this component, the system eliminates the associated hydrogen emissions to the atmosphere, thereby reducing both operational costs and startup time while maintaining the capability to fill the anode supply manifold with hydrogen.
3Productivity
If the anode is filled quickly to limit cumulative hydrogen discharge events, then the frequency of discharge events is reduced, but the discharge valve size limits the filling rate
Solution Approach 1:
The invention extracts and eliminates the discharge valve from the system entirely during start-up operations. This removal of the limiting component allows the anode to be filled at maximum possible rates without being constrained by valve size, thereby maximizing productivity and eliminating the need for cumulative discharge event management.
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 approach allows for rapid and efficient filling of the anode side with hydrogen, reducing hydrogen emissions and startup time, while maintaining even reactant distribution across the fuel cell stack, thus minimizing hydrogen-air fronts and preventing carbon corrosion.
Implementation Method 1
supplying the fuel to the fuel cell stack substantially uniformly and substantially simultaneously to compress any fluids in the fuel cell stack into a volume between an end of each active area adjacent to the anode exhaust manifold and an outlet of the anode sub-system
Data Source
AI summary
A method for filling a fuel cell system with a fuel during start-up is disclosed, the method including the steps of providing a fuel cell stack having a plurality of fuels cells, each fuel cell having an active area, the fuel cell stack including an anode supply manifold and an anode exhaust manifold, the anode supply manifold and in fluid communication with a source of fuel; providing an anode sub-system in fluid communication with an anode side of the fuel cell stack; and supplying the fuel to the fuel cell stack substantially uniformly and substantially simultaneously to compress any fluids in the fuel cell stack into a volume between an end of each active area adjacent to the anode exhaust manifold and an outlet of the anode sub-system.