Three-Chamber Electrolysis Cell for Low-Energy CO2 Release
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Solution Overview
Problem
Existing methods for capturing carbon dioxide from air streams are inefficient under variable environmental conditions and require high energy input for desorption, often resulting in impure carbon dioxide streams and complex separation processes.
Innovation Solution
A method involving an aqueous solution of carbon dioxide absorbents containing cations from the first group of the periodic table, which is passed through an air stream to bind carbon dioxide, followed by electrolysis in a three-chamber electrolysis cell with a membrane selective for monovalent cations to release carbon dioxide, allowing for efficient and pure carbon dioxide recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an absorption agent is circulated between an absorber and a desorber to separate CO2, then CO2 separation is achieved, but the system requires large volume and high energy input for heating
Solution Approach 1:
The system is divided into three functional chambers: first absorption chamber, second absorption chamber, and desorption chamber. This segmentation allows simultaneous absorption and desorption processes, eliminating the need to heat entire large-volume absorbers and reducing overall energy input required for CO2 separation.
Solution Approach 2:
The absorption agents in the first and second absorption chambers are pre-cooled using a heat exchanger before entering the desorption chamber. This preliminary cooling reduces the thermal energy required for the desorption process, thereby lowering the overall energy input needed for the system to maintain CO2 separation efficiency.
2Quantity of substance
If an absorption agent is circulated between an absorber and a desorber to separate CO2, then CO2 separation is achieved, but the device complexity increases
Solution Approach 1:
The system is divided into three functional chambers: first absorption chamber, second absorption chamber, and desorption chamber. This segmentation allows simultaneous absorption and desorption processes, eliminating the need to heat entire large-volume absorbers and reducing overall energy input required for CO2 separation.
Solution Approach 2:
The heat exchanger integrates cooling functionality directly into the circulation system, pre-cooling absorption agents before desorption. This merging of thermal management functions reduces the need for separate complex cooling systems, thereby simplifying overall device structure while maintaining CO2 separation efficiency.
3Use of energy by stationary object
If absorption agents are cooled in a heat exchanger before entering the desorption chamber, then energy input is reduced, but the agents may freeze and clog the system
Solution Approach 1:
Different temperature zones are maintained in different chambers: the first and second absorption chambers operate at lower temperatures for efficient CO2 absorption, while the desorption chamber is heated to facilitate CO2 release. This local temperature differentiation allows selective cooling without causing freezing in the desorption chamber, maintaining system reliability.
Solution Approach 2:
The absorption agents in the first and second absorption chambers are pre-cooled using a heat exchanger before entering the desorption chamber. This preliminary cooling reduces the thermal energy required for the desorption process, thereby lowering the overall energy input needed for the system to maintain CO2 separation 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
The process effectively absorbs and desorbs carbon dioxide from air streams with varying concentrations, producing pure carbon dioxide with minimal energy input and eliminating the need for complex gas separation, suitable for both low and high carbon dioxide content streams.
Implementation Method 1
a first absorption chamber (102) arranged to receive a stream of air to be treated and a first absorption agent to absorb carbon dioxide from the stream of air to be treated
Implementation Method 2
a desorption chamber (104) arranged to receive the used first absorption agent and heat the used first absorption agent to a temperature sufficient to desorb the absorbed carbon dioxide from the used first absorption agent
Implementation Method 3
arranged to cool the regenerated first absorption agent by transferring heat to the stream of air to be treated
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention relates to a method for isolating carbon dioxide from an air flow, wherein the method comprises at least the following steps: a) providing an aqueous solution of a carbon dioxide absorption agent, wherein the carbon dioxide absorption agent comprises cations from the first main group of the periodic system; b) passing a carbon-dioxide-containing air flow through the solution provided in method step a), wherein at least one part of the carbon dioxide from the air flow is bonded to the carbon dioxide absorption agent and the air flow is enriched with carbon dioxide; c) introducing the aqueous solution from step b) or an aqueous solution comprising the carbon dioxide bonded to the carbon dioxide absorption agent into a central chamber of an at least three-chamber electrolysis cell formed by an anode chamber, cathode chamber and at least one central chamber arranged between the anode chamber and the cathode chamber, wherein the three-chamber electrolysis cell has a membrane that is selective for monovalent cations; and electrolysing the aqueous solution, releasing at least one part of the carbon dioxide.