Inert Gas Medium for CO2 Adsorbent Bed Desorption
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Solution Overview
Problem
Current CO2 capture technologies face inefficiencies in heating adsorbent beds for desorption, particularly with large beds or insulative materials, and steam-assisted desorption poses challenges like water interaction, hydrolysis, and energy costs, leading to suboptimal energy use and sorbent degradation.
Innovation Solution
Employing an inert chemical fluid with a boiling point between 30-220°C, which is vaporized to heat the adsorbent bed and act as a sweep gas for CO2 desorption, then cooled for separation, ensuring efficient heat transfer and minimizing interaction with adsorbent materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If steam is used to heat the adsorbent bed for desorption, then heat transfer efficiency is improved, but water interaction with adsorbent materials causes hydrolysis and sorbent degradation
Solution Approach 1:
The patent introduces an inert liquid medium (such as hydrocarbon oils or silicone oils) as an intermediary between the heat source and the adsorbent bed. This intermediate fluid transfers thermal energy to the adsorbent without causing hydrolysis or degradation, solving the contradiction between efficient heat transfer and sorbent protection
Solution Approach 2:
The patent creates an inert thermal environment by using chemically inert liquid media that do not react with the adsorbent materials. This inert thermal atmosphere allows for efficient heat transfer while preventing harmful chemical interactions such as hydrolysis and degradation of the sorbent structure
2Ease of operation
If external heaters or thermal jackets are used to heat the adsorbent bed, then heating control is improved, but device complexity and energy loss increase
Solution Approach 1:
The patent implements self-service heating by circulating a heated liquid medium through the adsorbent bed itself. The adsorbent bed becomes both the object to be heated and the medium for heat transfer, eliminating the need for separate external heaters and thermal jackets while maintaining effective temperature control
Solution Approach 2:
The patent merges the heating function with the adsorbent bed structure by using the bed material itself as the heat transfer medium. This consolidation eliminates separate heating equipment and reduces system complexity while maintaining heating control capability
3Quantity of substance
If high volumes of ambient air are processed for direct air capture, then CO2 capture capacity is improved, but energy consumption increases significantly
Solution Approach 1:
The patent changes the physical parameters of the desorption process by using liquid medium heating instead of conventional gas-phase heating. This parameter change enables more efficient heat transfer to the adsorbent bed, reducing the energy required to regenerate the sorbent after capturing CO2 from large volumes of ambient air
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 method allows for fast and uniform heating of adsorbent beds without external heaters, conserving energy and maintaining a pure product stream by using an inert gas medium that is non-interactive with the adsorbent components, thus enhancing the overall efficiency of CO2 capture processes.
Implementation Method 1
vaporizing an inert chemical fluid to form an inert gas medium
Implementation Method 2
passing the inert gas medium through the adsorbent bed to sufficiently heat the adsorbent bed
Implementation Method 3
act as a sweep gas to purge out the desorbed CO2 and other desorbed chemical moieties
Implementation Method 4
passing the inert gas medium containing the one or more desorbed, gaseous chemical moieties through a condenser maintained at a temperature sufficient to condense the inert gas medium
Implementation Method 5
CO2 capture processes commonly utilize some type of regenerable adsorbent bed to capture the CO2 from a gas or air stream
Implementation Method 6
During regeneration, the adsorbent bed is treated with, for example, heat, vacuum, steam, or some combination thereof to cause the CO2 to desorb from the sorbent
Data Source
AI summary
The present invention uses an inert gas medium to heat an adsorbent bed and effect desorption of one or more chemical moieties adsorbed thereon. In particular, the invention is useful for the desorption of CO2 from adsorption beds utilized for direct air capture (DAC) of CO2 as well as adsorption beds utilized for capture of CO2 from flue gases. The inert gas medium is heated to the necessary sorbent desorption temperature and passed through a CO2 adsorbent bed to bring it up to the proper desorption temperature and effect desorption. Once the bed is fully desorbed, the CO2-enriched gas medium is passed through one or more condensers to separate the inert gas medium from the CO2 product.