Electrolyser Pressure Compensation for Internal Gas Equalization
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Solution Overview
Problem
Existing high-pressure electrolysis systems require external compression of hydrogen and oxygen gases, necessitating robust construction to withstand differential pressures and relying on complex control systems, which can lead to overpressure and cross-contamination risks.
Innovation Solution
A high-pressure electrolyser system with a pressure compensating system that uses a fluid pipe with a pressure compensator, comprising a first and second fluid pipe portion and an incompressible fluid, to equalize pressures internally, eliminating the need for external compression and ensuring equal pressure across the electrolyser stack without sensors or electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external compression is used to compress hydrogen and oxygen gases, then gas compression is achieved, but the system requires robust construction to withstand differential pressures and complex control systems
Solution Approach 1:
The electrolyser system performs self-compression by utilizing the pressure differential naturally generated during electrolysis. The water feed pressure creates a differential pressure that compresses the gases in-situ, eliminating the need for external compressors and complex control systems while maintaining effective gas compression capability
Solution Approach 2:
The invention extracts and utilizes the pressure differential that naturally exists during electrolysis operation. By taking out the water feed pressure as a resource, the system converts this differential pressure into a useful compression function, removing the need for separate compression equipment and simplifying the overall system construction
2Power
If pressure regulating valve is used to control hydrogen pressure, then desired hydrogen production pressure is achieved, but the cathode flow path becomes deadheaded and requires complex control
Solution Approach 1:
The system uses the naturally occurring pressure differential from water feed to automatically regulate hydrogen pressure. The differential pressure itself serves as the control mechanism, eliminating the need for pressure regulating valves and complex flow control systems while maintaining effective pressure management
Solution Approach 2:
The water feed pressure acts as an intermediary that transfers control function from complex electronic pressure regulation to a simple mechanical pressure differential. This intermediary mechanism naturally balances the pressures without requiring active control components in the cathode flow path
3Stress or pressure
If high differential pressure is withstood by electrolyser construction, then high-pressure electrolysis is enabled, but the construction becomes more robust and complex
Solution Approach 1:
The system generates and utilizes its own pressure differential through water feed pressure, enabling high-pressure electrolysis without requiring the electrolyser construction to withstand excessive external differential pressures. The self-generated pressure differential is sufficient for compression while reducing construction requirements
4Power
If external compression is used for gas compression, then gas compression is achieved, but energy consumption increases
Solution Approach 1:
The electrolyser system performs self-compression using the pressure differential already present during electrolysis operation. This eliminates the need for separate external compressors that would consume additional energy, as the compression function is integrated into the electrolysis process itself using existing pressure resources
Solution Approach 2:
The system exploits the asymmetric pressure conditions created during electrolysis, where the water feed pressure creates a natural differential between compartments. This asymmetric pressure distribution is converted into useful compression work, achieving gas compression without symmetric external compression equipment and reducing overall energy consumption
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 system achieves self-adjusting pressure equalization, reducing energy consumption and preventing overpressure, thus enabling efficient and low-cost gas compression while preventing cross-contamination in the electrolyser stack.
Implementation Method 1
a pressure compensator arranged in the fluid pipe, separating the first fluid pipe portion and the second fluid pipe portion, wherein the pressure compensator is configured to move in the fluid pipe between the first fluid outlet and the second fluid outlet to thereby at least partially obstruct one of the first fluid outlet and the second fluid outlet in response to a pressure differences between the first fluid pipe portion and the second fluid pipe portion
Implementation Method 2
Electrolysis of water is a process in which water molecules are decomposed, forming hydrogen gas and oxygen gas. This process occurs as a result of an electric current flowing between two electrodes submerged in water.
Data Source
Figure 1~2
Figure 3~4b
AI summary
A pressure compensating system (1) for a dual fluid flow system, wherein the pressure compensating system (1) comprises: a fluid pipe (3) having a first fluid pipe portion (3a) and a second fluid pipe portion (3b), wherein the first fluid pipe portion (3a) has a first fluid inlet (5a) and a first fluid outlet (7a) for a first fluid flow (O2), wherein the second fluid pipe portion (3b) has a second fluid inlet (5b) and a second fluid outlet (7b) for a second fluid flow (H2) separate from the first fluid flow (O2), and a pressure compensator (11) arranged in the fluid pipe (3), separating the first fluid pipe portion (3a) and the second fluid pipe portion (3b), wherein the pressure compensator (11) is configured to move in the fluid pipe (3) between the first fluid outlet (7a) and the second fluid outlet (7b) to thereby at least partially obstruct one of the first fluid outlet (7a) and the second fluid outlet (7b) in response to a pressure differences between the first fluid pipe portion (3a) and the second fluid pipe portion (3b) to provide pressure compensation between the first fluid pipe portion (3a) and the second fluid pipe portion (3b).