Electrochemical CO2 Cell Feedback Control for Stable Product Gas
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Solution Overview
Problem
The fluctuation in renewable energy supply due to weather conditions leads to unstable CO2 reaction amounts and unreacted CO2 gas concentration in electrochemical CO2 reduction processes, affecting the manufacturability and efficiency of valuable materials like gasoline and methanol.
Innovation Solution
An electrochemical reaction device with a detection unit, regulation unit, and control unit to manage CO2 supply based on reaction amounts, stabilizing CO2 concentration in the produced gas by adjusting the CO2 flow rate using a variable throttle and flowmeter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a device of separating CO2 gas in produced gas is provided at subsequent stage to regulate CO2 gas concentration, then CO2 concentration stability is improved, but device cost and manufacturing cost increase
Solution Approach 1:
The invention performs preliminary action by controlling the CO2 supply amount before the electrochemical reaction occurs. The control unit adjusts the CO2 supply based on detected reaction amounts, preventing CO2 concentration fluctuations at their source rather than correcting them later through separation devices.
Solution Approach 2:
The invention implements feedback control where the control unit detects the reaction amount (via current or voltage) and uses this information to adjust the CO2 supply amount in real-time. This closed-loop feedback system maintains stable CO2 concentration without requiring additional separation equipment.
2Stability of the object's composition
If a device of separating CO2 gas in produced gas is provided at subsequent stage, then CO2 gas concentration is regulated, but manufacturing efficiency decreases
Solution Approach 1:
By controlling CO2 supply in advance based on detected reaction amounts, the system prevents concentration issues before they affect downstream processing, eliminating the need for separation steps and improving overall manufacturing efficiency.
Solution Approach 2:
Real-time feedback control adjusts CO2 supply to match actual reaction consumption, ensuring optimal CO2 concentration for continuous efficient operation without interruptions for separation or concentration regulation.
3Device complexity
If CO2 supply amount is not regulated according to reaction amount, then device complexity is reduced, but CO2 concentration fluctuation increases
Solution Approach 1:
The control unit uses feedback from reaction amount detection (current or voltage measurements) to dynamically adjust CO2 supply, achieving stable CO2 concentration with minimal additional device complexity.
Solution Approach 2:
The system performs self-service by using its own operational parameters (current or voltage) to control its input supply (CO2), creating a self-regulating system that maintains stability without external intervention.
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
Stabilizes CO2 concentration in the produced gas, reducing the need for additional gas concentration regulation devices and lowering the overall cost and improving manufacturing efficiency of valuable materials.
Implementation Method 1
The reduction electrode obtains reduction potential for CO2 from the power supply derived from renewable energy, and thereby reducing CO2 to produce carbon compounds
Implementation Method 2
an oxidation electrode that oxidizes water (H2O) to produce oxygen (O2)
Implementation Method 3
a detection unit that detects a reaction amount in the electrochemical reaction cell
Data Source
AI summary
An electrochemical reaction device in an embodiment includes: an electrochemical reaction cell including a first accommodation part for accommodating carbon dioxide, a second accommodation part for accommodating an electrolytic solution containing water, or water vapor, a diaphragm provided between the first accommodation part and the second accommodation part, a reduction electrode arranged in the first accommodation part, and an oxidation electrode arranged in the second accommodation part; a detection unit detecting a reaction amount in the electrochemical reaction cell; a regulation unit regulating an amount of the carbon dioxide to be supplied to the first accommodation part; and a control unit controlling the regulation unit based on a detection signal of the detection unit.