Separator Plate Channel Layout for Reaction Product Removal
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Solution Overview
Problem
Existing electrochemical systems, particularly electrolyzers, face inefficiencies due to the accumulation of reaction products, such as oxygen, which hinder the electrochemical reaction by reducing the accessibility of catalyst layers, leading to decreased local efficiency.
Innovation Solution
A separator plate design with channels having regions of reduced flow cross-sections, unevenly distributed along the channel length, to enhance the flow rate and removal of reaction products, ensuring catalyst layers are accessible by increasing the flow rate and promoting cross-flows between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the channel flow cross-section is uniform along the channel length, then the structure is simple and easy to manufacture, but reaction products accumulate in downstream regions reducing electrochemical reaction efficiency
Solution Approach 1:
The channel cross-sectional area is varied along the channel length, with the cross-sectional area at a downstream position being smaller than at an upstream position. This local variation in geometry creates higher flow velocity in downstream regions, enhancing the removal of reaction products and maintaining catalyst accessibility without complicating the overall manufacturing process.
2Productivity
If the reaction medium flow rate is increased to remove reaction products, then the removal efficiency improves, but the pressure loss and energy consumption increase
Solution Approach 1:
The channel cross-sectional area is gradually reduced along the flow direction, which naturally increases the flow velocity and enhances reaction product removal. This geometric parameter change achieves improved product removal efficiency without requiring a proportional increase in the overall flow rate, thereby reducing pressure loss and energy consumption compared to uniform high-flow designs.
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
The design effectively removes reaction products, enhancing the electrochemical reaction efficiency by ensuring catalyst layers are accessible, thereby improving the overall performance of the electrolyzer.
Implementation Method 1
The present disclosure therefore proposes structural adaptations to separator plates, by means of which such disadvantages can be at least partially reduced. In particular, it is proposed to achieve local increases in the flow rate of a reaction medium that is guided along the surface of the separator plate, by means of the regions with reduced flow cross-section.
Implementation Method 2
The use of electrochemical systems, and in particular electrolyzers, is prior art.
Data Source
AI summary
The present disclosure relates to a separator plate for an electrochemical system, in particular for an electrolyzer, wherein the separator plate has, at least on a first side, a plurality of channels through which flow can pass in a longitudinal direction of the channel and which are each separated from one another, at least in sections, by a web, wherein the channels each have a plurality of regions with reduced flow cross-section, wherein the number of regions with reduced flow cross-section within a first half of a total channel length of each channel is less than within a second half of the total channel length.