Electrochemical Oxygen Production With Recycle Dilution of Anode Hydrogen
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Solution Overview
Problem
Existing electrochemical oxygen production systems face challenges in removing hydrogen contamination from oxygen produced at the anode side during electrolysis, leading to safety risks and the need for high-purity oxygen, while conventional methods fail to effectively manage hydrogen impurities and prevent explosive mixtures.
Innovation Solution
A method and system that employs catalytic oxidation to convert hydrogen to water in the anode raw gas, followed by recycling a hydrogen-depleted intermediate mixture to dilute and purify the oxygen, using sensors to control hydrogen concentration and temperature, and employing condensation and drying processes to enhance purity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalytic oxidation is used to remove hydrogen from anode raw gas, then hydrogen concentration is reduced and safety is improved, but temperature increases excessively requiring specialized reactors
Solution Approach 1:
A recycle stream of hydrogen-depleted oxygen-rich gas is introduced as an intermediary medium to dilute the hydrogen concentration in the anode raw gas before catalytic oxidation. This prevents excessive temperature increase by controlling the fuel-to-oxidizer ratio in the catalytic reactor, allowing conventional reactors to be used while maintaining safety.
Solution Approach 2:
The hydrogen concentration and temperature parameters are controlled by adjusting the recycle ratio. By varying the amount of hydrogen-depleted gas recycled to the catalytic reactor, the system optimizes both safety (hydrogen removal) and thermal management (temperature control), resolving the contradiction between these two parameters.
2Device complexity
If hydrogen is not removed from anode raw gas, then process simplicity is maintained, but explosive mixtures form creating safety risks
Solution Approach 1:
The system merges the oxygen production function with the hydrogen removal function in a single integrated process. The anode raw gas from the electrolyzer is directly fed to the catalytic oxidation reactor, where both oxygen is produced and hydrogen is simultaneously removed through catalytic combustion, eliminating the need for separate purification steps.
Solution Approach 2:
A recycle stream of hydrogen-depleted oxygen-rich gas serves as an intermediary that enables safe hydrogen removal. This recycle stream is mixed with fresh anode raw gas before catalytic oxidation, providing a controlled environment for hydrogen combustion while maintaining process integration and avoiding complex multi-step purification sequences.
3Manufacturing precision
If oxygen purity requirements are increased, then product quality is improved, but system complexity increases due to additional purification requirements
Solution Approach 1:
Hydrogen, the primary impurity affecting oxygen purity, is extracted and removed through catalytic oxidation. By selectively removing hydrogen via the catalytic reactor and water condensation system, the system achieves high oxygen purity without requiring complex multi-stage purification equipment, as the main contaminant is eliminated in a single dedicated step.
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 reduces hydrogen concentration, preventing explosive mixtures and excessive temperature increases, allowing for the use of conventional reactors and ensuring high-purity oxygen production with efficient process control.
Implementation Method 1
at least a portion of the anode raw gas is subjected to a catalytic reaction of hydrogen to water
Implementation Method 2
catalytic oxidation to convert hydrogen to water
Implementation Method 3
employing condensation and drying processes to enhance purity and safety
Implementation Method 4
electrolysis processes
Data Source
Figure 1~2
AI summary
The invention relates to a method for producing a gas product (10) containing oxygen, wherein a feedstock (1) containing water is subjected to electrolysis (E) to obtain a raw anode gas (2), which is rich in oxygen and contains hydrogen, and a raw cathode gas (14), which is low in oxygen and rich in hydrogen. The raw anode gas is at least partially subjected to a catalytic conversion (C) of hydrogen to water to obtain a first mixture (4) with depleted hydrogen content. A first part of the first mixture (4) is returned to the raw anode gas (2) downstream of the electrolysis (E) and upstream of the catalytic conversion (C), and the gas product containing oxygen is formed using at least a second part of the first mixture. The invention also relates to a plant for carrying out a method of this type.