Electrolysis System Carbon Removal Control
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Solution Overview
Problem
In existing electrolysis systems, carbon deposition on the cathode reduces the efficiency of the electrolysis process, particularly when the utilization rate of the raw material gas increases, as seen in methods like JP 2022-022978 A, where carbon deposition leads to decreased efficiency in producing synthesis gas.
Innovation Solution
An electrolysis system with a control mechanism that switches between supplying a mixed gas and oxygen gas to the electrodes based on measured current thresholds, using an ammeter to monitor the current and a control device to manage the valve device, causing carbon deposited on the cathode to react with oxygen gas and thereby reducing carbon accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the utilization rate of the raw material gas in the solid oxide electrolytic cell is increased, then the production efficiency of synthesis gas is improved, but carbon deposits on the cathode causing electrolysis efficiency to decrease
Solution Approach 1:
The system alternates between two operational modes: a first mode for producing synthesis gas and a second mode for removing carbon deposits. The control device switches between these modes based on detected carbon deposition levels, enabling periodic carbon removal to maintain sustained electrolysis efficiency while preserving high productivity during synthesis gas production
Solution Approach 2:
The system converts the harmful effect of carbon deposition into a useful process by introducing oxygen gas that reacts with and removes carbon deposits from the cathode. This carbon removal process, while temporarily reducing synthesis gas production, restores the cathode's electrolysis performance and prevents long-term efficiency degradation
2Reliability
If carbon is removed from the cathode by supplying oxygen gas, then electrolysis efficiency is restored, but the production of synthesis gas is temporarily reduced
Solution Approach 1:
The system implements periodic alternation between synthesis gas production mode and carbon removal mode. During carbon removal mode, oxygen gas is supplied to react with and eliminate carbon deposits, temporarily halting synthesis gas production but restoring electrolysis efficiency for subsequent production cycles
Solution Approach 2:
The control device continuously monitors the electrolysis process and detects carbon deposition levels on the cathode. Based on this feedback, the system automatically determines when carbon removal is necessary and switches between operational modes, optimizing the balance between maintaining productivity and preserving electrolysis efficiency
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 approach effectively suppresses the reduction in electrolysis efficiency by reducing carbon deposition on the cathode, thereby maintaining or improving energy efficiency during the electrolysis of mixed gases containing carbon dioxide and water vapor.
Implementation Method 1
an electrolysis device that includes an electrolyte membrane and a pair of electrodes that are a cathode and an anode sandwiching the electrolyte membrane and electrolyzes a mixed gas containing carbon dioxide gas and water vapor
Implementation Method 2
causes carbon deposited on the cathode to react chemically with the oxygen gas
Data Source
AI summary
An electrolysis system is provided with a valve device that switches between supplying a mixed gas to a cathode and supplying oxygen gas to an anode, an ammeter that measures an electric current between a pair of electrodes, and a control device that controls the valve device to switch what is supplied to the electrolysis device from the mixed gas to the oxygen gas when the electric current falls below a predetermined first threshold value while the mixed gas is supplied to the electrolysis device, and causes carbon deposited on the cathode to react chemically with the oxygen gas.