Alkaline Electrolyte Circulation Layout for Pressurized Gas Purity
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Solution Overview
Problem
In alkaline water electrolysis under pressurized conditions, dissolved gases such as oxygen and hydrogen accumulate in the electrolyte circulation tanks, leading to potential flammability risks and reduced gas purity due to mixing and pressure differences between anode and cathode chambers.
Innovation Solution
A gas production apparatus with separate electrolyte circulation systems for the anode and cathode chambers, incorporating an electrolyte exchanger to balance electrolyte levels and concentrations, and pressure regulation to prevent flammability and enhance gas purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single circulation tank is used to store electrolyte from both anode and cathode chambers, then the device complexity is reduced, but the gas purity deteriorates and flammability risk increases due to mixing of oxygen-containing and hydrogen-containing electrolyte
Solution Approach 1:
The circulation system is segmented into separate circulation tanks for the anode chamber and cathode chamber. The anode circulation tank stores electrolyte containing dissolved oxygen, while the cathode circulation tank stores electrolyte containing dissolved hydrogen. This segmentation prevents mixing of gases from both chambers, maintaining high gas purity and preventing flammability risks while managing the complexity through modular design
Solution Approach 2:
Dissolved gases are extracted from the electrolyte in separate gas-liquid separation units before the electrolyte enters the circulation tanks. Oxygen is removed from the anode electrolyte and hydrogen from the cathode electrolyte, preventing gas accumulation and maintaining safety while preserving electrolyte quality for continued use
2Productivity
If high pressure is applied to increase gas production efficiency, then the productivity improves, but the amount of dissolved gas in electrolyte increases leading to higher flammability risk
Solution Approach 1:
Gas-liquid separation units are positioned in the circulation lines to remove dissolved gases from the electrolyte before the electrolyte returns to the electrolysis chambers. This preliminary removal of oxygen and hydrogen from the electrolyte prevents the accumulation of flammable gas mixtures, enabling safe operation at high pressures while maintaining high productivity
Solution Approach 2:
The gas-liquid separation units act as intermediary devices between the high-pressure electrolysis process and the circulation tanks. These separators mediate by removing dissolved gases under pressure, allowing the system to operate at high pressure for increased productivity while preventing the transfer of flammable gas mixtures to the circulation system
3Manufacturing precision
If separate circulation tanks are used for anode and cathode electrolyte, then the gas purity is maintained, but the device complexity and electrolyte management difficulty increase
Solution Approach 1:
Each circulation tank system is designed as a self-contained unit that performs multiple functions: storing electrolyte, removing dissolved gases, and maintaining electrolyte concentration. The anode circulation tank handles oxygen removal and the cathode circulation tank handles hydrogen removal, with each system being universally applicable to its respective chamber while maintaining simplicity within each module
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
Stable production of hydrogen and oxygen gases is achieved while preventing flammability risks and maintaining high gas purity by balancing electrolyte levels and concentrations, even under pressurized conditions.
Implementation Method 1
pressure difference between the first circulation system and the second circulation system
Implementation Method 2
water is electrolyzed using a basic aqueous solution (alkaline water) containing a dissolved alkali metal hydroxide (such as NaOH and KOH) as an electrolyte, to generate hydrogen gas at a cathode and oxygen gas at an anode
Data Source
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AI summary
A gas production apparatus including: an electrolysis vessel; first and second electrolyte circulation systems; and an electrolyte exchanger, the first/second electrolyte circulation system including: a first/second circulation tank receiving and storing a first/second electrolyte flowing out from an anode chamber/a cathode chamber; and a first/second circulation pump supplying the first/second electrolyte to the anode chamber/the cathode chamber, the electrolyte exchanger transferring part of the first electrolyte existing in the first electrolyte circulation system into the second electrolyte circulation system on one hand, and transferring part of the second electrolyte existing in the second electrolyte circulation system into the first electrolyte circulation system on the other hand.