Synthesis Gas Electrolysis Control via Catalyst and Voltage Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
It is difficult to control the carbon dioxide concentration in the electrolytic solution of synthesis gas production systems, making it challenging to maintain the desired mole ratio of hydrogen to carbon monoxide.
Innovation Solution
A synthesis gas production system that includes an electrolysis device with a cathode chamber, anode chamber, and a separator membrane, along with a catalyst supply device and gas composition detection system, allowing for the adjustment of the CO production catalyst and voltage to maintain the H2 to CO ratio within a predetermined target range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon dioxide concentration in the electrolytic solution is controlled to improve FT reaction efficiency, then the mole ratio of carbon monoxide to hydrogen can be maintained at 1/2, but it is difficult to control the carbon dioxide concentration in a well-responsive manner
Solution Approach 1:
The system employs a gas composition detection device to continuously monitor the mole ratio of CO to H2 in the produced synthesis gas, and a control device adjusts the carbon dioxide supply amount based on detected composition deviations. This closed-loop feedback mechanism enables responsive control of the electrolytic solution's CO2 concentration, directly addressing the controllability issue while maintaining optimal FT reaction efficiency.
Solution Approach 2:
The system dynamically adjusts the carbon dioxide concentration parameter in the electrolytic solution based on detected gas composition. By changing the CO2 concentration parameter in response to composition deviations, the system achieves well-responsive control over the mole ratio of CO to H2, thereby maintaining optimal conditions for FT reaction efficiency.
2Quantity of substance
If the amount of CO production catalyst is increased, then the production amount of CO increases and the ratio of H2 to CO decreases, but this requires additional control means beyond carbon dioxide concentration adjustment
Solution Approach 1:
The control device performs multiple functions: it controls both the carbon dioxide supply amount to the electrolytic solution and the supply amount of CO production catalyst to the cathode solution. By consolidating these control functions into a single device, the system achieves the needed complexity without requiring separate independent control systems, thus managing device complexity while enabling precise CO production control.
Solution Approach 2:
The system dynamically adjusts the CO production catalyst supply amount based on detected gas composition and control targets. This dynamic control allows flexible adjustment of CO production levels by modulating catalyst supply, enabling the system to achieve desired H2 to CO ratios without fixed, overly complex control architecture.
3Quantity of substance
If the voltage applied to the electrolysis device is increased, then the current density increases and the production amount of H2 increases, whereby the ratio of H2 to CO in the production gas increases, but this requires precise voltage control to maintain target ratio
Solution Approach 1:
The control device continuously monitors the H2 to CO ratio through gas composition detection and adjusts the applied voltage accordingly. This feedback control compensates for variations in system conditions, maintaining precise voltage control without requiring overly complex control mechanisms. The detected composition deviations trigger automatic voltage adjustments to keep the ratio within target ranges.
Solution Approach 2:
The system adjusts the voltage parameter dynamically based on detected gas composition and control targets. By changing the voltage parameter in response to composition deviations, the system achieves precise control over H2 production and the H2 to CO ratio, maintaining optimal conditions for downstream applications like FT reactions.
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 configuration enables precise control of the H2 to CO ratio in the production gas, improving the efficiency of reactions such as the Fischer-Tropsch process by maintaining the ratio between 0.25 and 2.5, enhancing the overall reaction efficiency.
Implementation Method 1
producing carbon monoxide and hydrogen by electrolyzing an aqueous solution containing carbon dioxide
Implementation Method 2
a separator membrane separating the anode chamber and the cathode chamber
Data Source
AI summary
A synthesis gas production system for producing CO and H2 by electrolyzing an aqueous solution containing CO2 includes: an electrolysis device including an anode chamber and a cathode chamber separated by a separator membrane; a cathode-side circulation line connected to the cathode chamber to circulate a cathode solution containing CO2; a catalyst supply device provided in the cathode-side circulation line to supply a CO production catalyst to the cathode solution; and a gas composition detection device configured to measure a ratio between CO and H2 in a production gas produced in the cathode chamber. At least one of control of a supply amount of the CO production catalyst by the catalyst supply device and control of a voltage applied between the anode and the cathode by the electrolysis device is performed to make a ratio of H2 to CO in the production gas be within a predetermined target range.