Anode Subsystem Layout With Gas Bypass for Freeze Purge
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Solution Overview
Problem
Existing anode subsystems in hydrogen fuel cell systems face challenges in efficiently purging gas at freezing temperatures due to residual frozen water blocking the passageway, necessitating a single valve that can both drain liquid and purge gas without the need for lengthy heater-based thawing processes.
Innovation Solution
A capture device with a solenoid valve that operates between open and closed states to simultaneously drain liquid and purge gas, utilizing a gas bypass hose and conduit design that maintains fluid communication above the maximum liquid line to bypass frozen water, ensuring rapid operation at freezing temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single valve is used to drain liquid and purge gas, then device complexity is reduced and weight is decreased, but gas purging capability is lost at freezing temperatures due to frozen water blocking the passageway
Solution Approach 1:
The single valve passageway is segmented into two distinct flow paths: a liquid drain path and a gas bypass path. The gas bypass hose provides an alternative route that circumvents the valve outlet where frozen water would block the path, allowing gas to be purged even when liquid drainage is blocked by ice.
Solution Approach 2:
The gas bypass hose acts as an intermediary element that mediates between the valve inlet and outlet. It provides a separate communication path for gas that does not pass through the frozen outlet region, enabling gas purging to occur independently of the liquid drainage path that is blocked by ice.
2Reliability
If a heater is incorporated to melt frozen water, then gas purging capability is restored, but the time required for operation increases to several minutes
Solution Approach 1:
The gas bypass hose is pre-configured in the system design, providing an immediate alternative path for gas flow. When freezing conditions occur, the bypass path is already in place and can be activated instantly without requiring preliminary heating action to melt the frozen water blocking the main outlet.
Solution Approach 2:
The gas bypass hose enables the gas flow to skip through the frozen region by providing an alternative route that goes above the maximum liquid line. This allows gas to rush through the system immediately without waiting for the frozen water to be melted, dramatically reducing startup time.
3Productivity
If the valve outlet is positioned to adequately drain water, then liquid drainage is improved, but gas purging is blocked by residual frozen water
Solution Approach 1:
The gas bypass hose introduces a third spatial dimension to the flow paths by routing gas through a different location (above the maximum liquid line) rather than through the same outlet path used for liquid drainage. This dimensional separation allows both liquid drainage and gas purging to occur simultaneously without interference, even in freezing conditions.
Solution Approach 2:
The flow paths are segmented into distinct routes: liquid flows through the valve outlet while gas flows through the bypass hose. This segmentation separates the two functions spatially, allowing the valve outlet to be optimized for liquid drainage without compromising gas purging capability, as gas takes a different path that avoids the frozen outlet region.
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
Enables rapid gas purging and liquid drainage within seconds of vehicle startup, improving packaging efficiency, reducing weight, and simplifying control, while maintaining system functionality in freezing conditions.
Implementation Method 1
A solenoid valve is disposed between the chamber and the outlet. The solenoid valve is operable between an open state permitting fluid communication between the chamber and the outlet to drain liquid and purge gas from the chamber
Implementation Method 2
A gas bypass hose includes a first end at the body and in fluid communication with the upper end region of the chamber and a second end at the body and in fluid communication with the lower end region of the chamber
Implementation Method 3
While a heater may be incorporated into the design of the anode subsystem to melt the frozen water
Implementation Method 4
The anode subsystem captures water and hydrogen gas from a fuel cell outlet, separates the water from the gas to exhaust the water from the fuel cell system
Data Source
AI summary
A capture device including a body defining a chamber configured to receive liquid and gas from a fuel cell system. The chamber includes an upper end region and a lower end region. An outlet is disposed at the body in fluid communication with the lower end region of the chamber. A gas bypass hose includes a first end in fluid communication with the upper end region of the chamber and a second end in fluid communication with the lower end region of the chamber. A solenoid valve is disposed between the chamber and the outlet. The solenoid valve is operable between an open state permitting fluid communication between the chamber and the outlet to drain liquid and purge gas from the chamber and a closed state preventing fluid communication between the chamber and the outlet.