Fuel Cell Reactant Manifold Divider for Ice Blockage Prevention
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Solution Overview
Problem
Fuel cell stacks face ice blockages in reactant outlet manifolds at subzero temperatures due to water accumulation, which can cause damage and disrupt fluid flow.
Innovation Solution
Incorporating a divider with ports and separating walls in the reactant outlet manifold to separate liquid water, guiding it away from the oxidant outlet ducts and preventing ice formation, while ensuring electrical insulation to avoid shorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid water accumulates in the reactant outlet manifold, then the manifold can operate normally at above-freezing temperatures, but ice blockages occur at subzero temperatures causing fluid flow disruption and cell damage
Solution Approach 1:
The manifold is segmented into multiple chambers by dividers, with each chamber serving a specific function (collection, drainage, or flow). This segmentation prevents water accumulation in any single chamber and ensures that ice cannot form blockages across the entire manifold, thereby maintaining reliability at subzero temperatures while preserving normal operation at above-freezing temperatures
Solution Approach 2:
Hydrophobic coatings are applied to the manifold surfaces as an intermediary layer that repels liquid water while allowing gas flow. This intermediary prevents water accumulation that would otherwise freeze and cause blockages, without interfering with the normal operation of the manifold at above-freezing temperatures
2Object-affected harmful factors
If water is removed from the reactant outlet manifold before freezing, then ice blockages are prevented, but additional drainage infrastructure and complexity are required
Solution Approach 1:
The drainage function is merged with the existing manifold structure by incorporating drainage channels and outlets directly into the manifold body. This integration eliminates the need for separate external drainage systems, preventing ice blockages while minimizing additional complexity
Solution Approach 2:
The manifold design uses gravity-driven water drainage where collected water automatically flows to drainage outlets without requiring external pumps or active control systems. This self-service approach prevents ice blockages while keeping the drainage system simple and reliable
3Object-affected harmful factors
If the manifold design is modified to prevent water accumulation, then ice blockages are avoided, but the manifold structure and fluid distribution characteristics may be affected
Solution Approach 1:
Different regions of the manifold are given different properties: collection chambers have larger volume to capture water, drainage channels have specific geometries to facilitate water flow, and flow channels maintain their original characteristics for gas distribution. This local differentiation prevents water accumulation while preserving overall structural simplicity and fluid distribution performance
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
Effectively prevents ice blockages by managing water movement and drainage, maintaining fluid flow and preventing electrical shorting in fuel cell stacks, even in large arrays with multiple oxidant outlet ducts.
Implementation Method 1
In a solid polymer electrolyte fuel cell stack, liquid water can accumulate in the reactant outlet manifolds, and particularly an oxidant outlet manifold. Such ice blockages can be prevented by modifying the internal design of the manifold to include both an appropriate divider having a plurality of ports and at least one appropriate separating wall.
Implementation Method 2
Fuel cells such as solid polymer electrolyte or proton exchange membrane fuel cells electrochemically convert reactants, namely fuel (such as hydrogen) and oxidant (such as oxygen or air), to generate electric power.
Implementation Method 3
Solid polymer electrolyte fuel cells generally employ a proton conducting, solid polymer membrane electrolyte between cathode and anode electrodes.
Implementation Method 4
Stacks designed to achieve high power density (e.g. automotive stacks) typically circulate liquid coolant throughout the stack in order to remove heat quickly and efficiently.
Implementation Method 5
Water is the primary by-product in a cell operating on hydrogen and air reactants.
Data Source
AI summary
At below freezing temperatures, ice blockages can be prevented in the reactant outlet manifolds of solid polymer electrolyte fuel cell stacks by modifying the internal design of the manifolds. The reactant outlet manifold comprises a divider dividing the manifold into an upper duct section and a lower main flow section and the divider comprises a plurality of ports fluidly connecting the duct section to the main flow section. The reactant manifold also comprises at least one separating wall in the duct section which partially separates the ports from one another in the duct section.