Vertical Fuel Cell Stack Manifold for Condensate Discharge
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Solution Overview
Problem
Conventional fuel cell stacks face issues with water vapor condensation into liquid water during temperature changes, leading to potential freezing and malfunctioning of valves in cold climates, as the existing horizontal gas manifold design inefficiently discharges water vapor, causing liquid water to accumulate and potentially freeze in pipes.
Innovation Solution
The fuel cell stack is configured with power generation cells stacked vertically, featuring a discharge passage defining member with a water collection portion and a tubular discharge passage extending vertically, allowing water to be collected and discharged efficiently, preventing accumulation in pipes and reducing the risk of freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a horizontal gas manifold and drain configuration is used, then the structure is simple and easy to manufacture, but water vapor condensation leads to liquid water accumulation that cannot be effectively discharged in cold climates
Solution Approach 1:
The patent transitions from a horizontal gas manifold configuration to a vertical configuration. The gas manifold is arranged vertically with multiple gas holes in stacked power generation cells, and the discharge passage defining member extends vertically with an annular cross-section. This vertical arrangement utilizes gravitational force to enable liquid water to flow downward into the discharge passage, solving the water discharge reliability issue in cold climates while maintaining structural simplicity.
Solution Approach 2:
The water collection portion is provided on the upper wall surface of the vertical gas manifold to preliminarily collect liquid water before it flows into the discharge passage. This preliminary collection action ensures that condensed water is captured and directed into the discharge passage before it can accumulate or freeze in the gas manifold, preventing valve malfunction and maintaining reliable operation in cold environments.
2Ease of operation
If the gas manifold is located above the drain in a horizontal configuration, then installation is straightforward, but condensed liquid water flows into connected pipes and may freeze causing valve malfunction
Solution Approach 1:
The patent changes the spatial arrangement from horizontal to vertical. The gas manifold extends vertically through stacked power generation cells, and the discharge passage defining member is positioned below the water collection portion with a vertical discharge passage. This vertical configuration ensures that liquid water collected from condensation naturally flows downward into the discharge passage due to gravity, preventing it from entering external pipes where freezing could occur.
Solution Approach 2:
The discharge passage defining member acts as an intermediary structure between the vertical gas manifold and the external discharge system. It provides a dedicated vertical discharge passage that receives liquid water from the water collection portion and directs it safely to the exterior, serving as a protective intermediary that prevents condensed water from entering and freezing in the connected pipes and valves.
3Reliability
If a vertical stacking configuration with vertical gas manifold is used, then water discharge reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the gas manifold function with the water discharge function into a single integrated vertical structure. The vertical gas manifold serves both as a gas flow passage and as a structure that, in combination with the discharge passage defining member, forms the water discharge path. The discharge passage defining member with its annular cross-section is positioned within the vertical gas manifold structure, combining multiple functions into one compact vertical arrangement that does not significantly increase overall device complexity.
Solution Approach 2:
The vertical gas manifold structure serves multiple functions: it provides a pathway for gas flow through the stacked power generation cells, provides an upper wall surface with a water collection portion for collecting condensed liquid water, and works with the discharge passage defining member to form a vertical discharge passage. This multi-functional design achieves reliable water discharge without requiring separate complex systems for gas flow and water 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 configuration ensures smooth discharge of liquid water produced during condensation, reducing the likelihood of pipe clogging and improving the fuel cell stack's performance in cold climates by preventing valve freezing and maintaining efficient operation.
Implementation Method 1
When the operation of the fuel cell stack is stopped so that its temperature becomes relatively low, water vapor is condensed in the gas manifold. This produces liquid water in the gas manifold.
Implementation Method 2
the discharge passage defining member is located below the water collection portion of the gas manifold and defines a discharge passage out of which the water dropping from the water collection portion is discharged.
Data Source
AI summary
A fuel cell stack includes power generation cells stacked in a vertical direction and a discharge passage defining member extending in the vertical direction. Each of the power generation cells includes a gas hole. The gas holes of the power generation cells define a gas manifold which extends in the vertical direction and through which gas flows. Part of an upper wall surface of the gas manifold includes a water collection portion configured to collect water from the upper wall surface. The discharge passage defining member is located below the water collection portion of the gas manifold and defines a discharge passage out of which the water dropping from the water collection portion is discharged.