Alkaline Electrolyzer Channel Design for Shunt Current Reduction
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Solution Overview
Problem
Alkaline electrolyzers face inefficiencies due to parasitic currents caused by lye and gas flow channels, leading to reduced hydrogen and oxygen production efficiency and purity.
Innovation Solution
The design incorporates first and second lye inlet channels with intermediate lye channels and common hydrogen and oxygen outlet channels with intermediate channels, increasing the current path length and resistance to shunt currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lye inflow channels and lye/gas outflow channels are used to supply electrolyte and conduct gases, then the electrolyzer can operate continuously with electrolyte circulation, but parasitic currents are generated that reduce efficiency and gas purity
Solution Approach 1:
The patent extracts the harmful function of the channels by removing their electrical conductivity. The lye inflow channels and lye/gas outflow channels are separated into distinct non-conductive components, preventing parasitic current flow while maintaining their utility for electrolyte supply and gas removal. This isolation eliminates the energy loss pathway while preserving continuous operation capability.
Solution Approach 2:
The patent introduces non-conductive materials as intermediaries between the electrolyte channels and the electrical circuit. These non-conductive channel components act as mediators that allow electrolyte flow and gas transport while blocking electrical current, thus preventing parasitic currents from forming through the channel structure.
2Productivity
If high pressure is applied to compact bubbles and increase electrode contact area, then hydrogen and oxygen can be stored directly at elevated pressure without compression, but the alkaline electrolyte becomes more corrosive at high pressure and temperature
Solution Approach 1:
The patent modifies the electrical parameter of the channel system by changing its conductivity from conductive to non-conductive. This parameter change prevents parasitic current flow while allowing the system to operate at high pressure and temperature conditions, thereby enabling direct high-pressure hydrogen storage without the harmful side effect of increased electrolyte corrosion through current pathways.
3Ease of operation
If shunt currents flow through lye channels and gas channels, then the channels conduct electricity, but this generates unwanted gas in the wrong channels and reduces overall efficiency
Solution Approach 1:
The patent extracts the harmful electrical conduction function from the lye and gas channels by making them non-conductive. This removal of conductivity prevents shunt currents from flowing through these channels, thereby eliminating the generation of unwanted gas in incorrect channels and improving overall system efficiency while maintaining ease of operation.
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 significantly reduces shunt currents, increasing hydrogen production by up to 23% and improving the purity of the produced gases.
Implementation Method 1
electrolyzer for producing hydrogen and oxygen from water under high pressure
Implementation Method 2
The high pressure will compact the bubbles and increase the contact area
Implementation Method 3
some of the current supplied to the cell stack will not go the proper way from one electrode to the other, but may pass outside the stacked cells in the conducting electrolyte supplied through lye inflow channels
Data Source
AI summary
It is described a high-pressure alkaline electrolyzer for splitting water into hydrogen and oxygen, said electrolyzer comprising a stack of electrolysis cells (1), with channels supplying lye to the cathodes and anodes and channels conducting hydrogen from the cathodes and oxygen from the anodes. The electrolyzer includes first and second lye inlet channels (4a, 4b), a multitude of first intermediate lye channels (5a) conducting lye from the first lye inlet channel (4a) to each cathode (3a) in the stack, a multitude of second intermediate lye channels (5b) conducting lye from the second lye inlet channel (4b) to each anode (3b) in the stack, wherein the hydrogen conducting channels include a common hydrogen outlet channel (7a) and a multitude of intermediate hydrogen channels (8a) conducting hydrogen from each cathode (3a) to the common hydrogen outlet channel (7a), and the oxygen conducting channels include a common oxygen outlet channel (7b) and a multitude of intermediate oxygen channels (8b) conducting oxygen from each anode (3b) to the common oxygen outlet channel (7b).