Electrolysis System Crossflow Design for CO2 Reduction
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Solution Overview
Problem
Current electrolysis systems for carbon dioxide reduction face challenges such as pH and ion concentration changes, membrane complications, and electrolyte crystallization due to cation migration, requiring separate electrolyte regeneration and large storage tanks, which complicates continuous operation.
Innovation Solution
An electrolysis system with a crossflow design where electrolyte is circulated between two reservoirs connected by a pressure-equalizing line, ensuring constant salt concentration and pH balance, preventing salting-out and maintaining a stable electrolyte level, allowing continuous operation with the same electrolyte in both chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same electrolyte is used in both anolyte and catholyte circuits, then the device complexity is reduced by eliminating the need for separate electrolyte management systems, but the electrolyte stability deteriorates due to pH and ion concentration changes during prolonged operation
Solution Approach 1:
The electrolyte circuit is segmented into two separate reservoirs (first electrolyte reservoir for anolyte, second electrolyte reservoir for catholyte) that are physically divided but functionally connected through the pressure-equalizing line. This segmentation allows independent management of each electrolyte while maintaining overall system simplicity.
Solution Approach 2:
A pressure-equalizing line acts as an intermediary connection between the two electrolyte reservoirs. This intermediary component enables pressure balance and prevents salting-out without requiring complex control systems or separate management infrastructure.
2Reliability
If the initial electrolyte concentration is raised to prevent crystallization, then the reliability of continuous operation is improved, but the device complexity increases due to the need for larger electrolyte reservoirs
Solution Approach 1:
The pressure-equalizing line enables continuous pressure equalization between reservoirs, preventing the conditions that lead to crystallization and salting-out. This continuous action maintains electrolyte stability without requiring oversized reservoirs or frequent interruptions for electrolyte renewal.
Solution Approach 2:
The system dynamically maintains optimal electrolyte parameters (concentration, pH) through the pressure-equalizing mechanism, which prevents deviation into ranges that would cause crystallization or salting-out, eliminating the need for excessive initial concentration or large reservoir volumes.
3Stability of the object's composition
If an ion exchange membrane is used to separate anolyte and catholyte circuits, then the electrolyte stability is improved by preventing cation migration, but the device complexity increases due to the additional membrane component
Solution Approach 1:
The ion exchange membrane is extracted from the system and replaced by a pressure-equalizing line connecting separate reservoirs. This removal eliminates the membrane-related complexity while achieving the same goal of preventing cation migration through physical separation of electrolyte reservoirs.
Solution Approach 2:
The function of the ion exchange membrane (preventing cation migration) is copied by the pressure-equalizing line system with separate reservoirs, which achieves equivalent electrolyte stability without the complexity of membrane integration.
4Stability of the object's composition
If electrolyte is periodically renewed to maintain stability, then the electrolyte composition stability is improved, but the productivity decreases due to interruption of continuous operation
Solution Approach 1:
The pressure-equalizing line enables continuous operation without electrolyte renewal interruptions. The system maintains electrolyte stability through continuous pressure equalization, eliminating periodic shutdowns for electrolyte replacement and thereby maximizing productivity.
Solution Approach 2:
The electrolyte system serves itself by automatically maintaining stability through the pressure-equalizing mechanism. The separate reservoirs with pressure equalization self-regulate electrolyte conditions without external intervention or periodic renewal, enabling continuous productive operation.
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
The crossflow design stabilizes electrolyte conditions, preventing salting-out and maintaining a constant electrolyte level, enabling continuous electrolysis without the need for frequent electrolyte regeneration, thus optimizing the electrochemical reduction of carbon dioxide to hydrocarbons or carbon monoxide.
Implementation Method 1
a pressure-equalizing line (13) which directly connects the first and second electrolyte reservoirs (6, 7)
Implementation Method 2
a first connecting line (9) for supplying electrolyte from the first electrolyte reservoir (6) to the anode chamber (2), a second connecting line (10) for taking electrolyte from the anode chamber (2) off to the second electrolyte reservoir (7)
Implementation Method 3
catalysis is enabled of a reduction reaction of carbon dioxide to at least one hydrocarbon compound or to carbon monoxide
Implementation Method 4
where catalysis is enabled of a reduction reaction of carbon dioxide
Implementation Method 5
The construction exhibits an electrolysis cell 1 having an anolyte circuit and a catholyte circuit 20 and 21, separated by means for example of an ion exchange membrane
Data Source
AI summary
The present disclosure relates to electrolysis. For example, an electrolysis system for carbon dioxide utilization may include: an electrolysis cell having an anode and a cathode, where carbon dioxide reduces at the cathode to at least one hydrocarbon compound or to carbon monoxide; first and second electrolyte reservoirs; a first product gas line from the first electrolyte reservoir; a second product gas line from the second electrolyte reservoir; a first connecting line supplying electrolyte from the first electrolyte reservoir to the anode; a second connecting line taking electrolyte from the anode to the second electrolyte reservoir; a third connecting line supplying electrolyte from the second electrolyte reservoir to the cathode; a fourth connecting line taking electrolyte from the cathode off to the first electrolyte reservoir; and a pressure-equalizing connection directly connecting the first and second electrolyte reservoirs.