Open-Cell Foam Air-Liquid Exchanger for CO2 Removal
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Solution Overview
Problem
Existing methods for removing CO2 from air are inefficient due to high energy consumption and limited sorbent refresh rates, leading to reduced CO2 capture and increased costs, with existing scrubber designs requiring disassembly for sorbent replenishment and having limited surface area exposure.
Innovation Solution
The use of open-cell foams as air/liquid exchangers, which provide a large surface area for gas-liquid contact and allow for continuous fluid transport within the foam structure, reducing the need for frequent sorbent replenishment and minimizing energy consumption by maintaining CO2 uptake for extended periods without continuous wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional scrubber designs with packed bed type implementations are used, then CO2 removal efficiency is improved, but device complexity increases and sorbent replenishment requires disassembly
Solution Approach 1:
The device is divided into modular components: a housing that can be disassembled, separate absorption elements (sorbent-coated foams or fibers), and a regeneration system. This segmentation allows the sorbent to be replenished or regenerated without replacing entire assemblies, reducing device complexity while maintaining CO2 removal efficiency.
Solution Approach 2:
The patent employs porous foam structures or fibrous materials as the substrate for sorbent coating. These porous materials provide high surface area for CO2 absorption while maintaining structural integrity and allowing fluid flow through the device, thereby achieving efficient CO2 removal with simpler device architecture.
2Productivity
If air is washed with alkaline solution in tanks filled with Raschig rings, then CO2 removal efficiency is improved, but energy consumption increases
Solution Approach 1:
The system incorporates a regeneration capability where spent sorbent is treated and reused within the same device. The sorbent can be regenerated by heating or chemical treatment in situ, eliminating the need for continuous fresh sorbent supply and reducing the energy associated with transporting and processing large volumes of alkaline solution.
Solution Approach 2:
The patent utilizes temperature and pressure variations to enhance CO2 absorption and desorption cycles. By cycling through different temperature and pressure conditions, the system achieves efficient CO2 removal and sorbent regeneration with minimal external energy input, replacing the continuous energy-intensive washing process.
3Productivity
If gel absorbers are used for eliminating small amounts of CO2, then CO2 removal efficiency is improved, but pressure losses increase
Solution Approach 1:
The use of porous foam or fibrous substrates provides a structured medium with controlled pore sizes that facilitate gas flow while maximizing sorbent surface area exposure. This structure reduces flow resistance compared to gel absorbers, maintaining low pressure losses while achieving high CO2 removal efficiency through increased surface area contact.
4Productivity
If sorbent material is impregnated in porous plates before assembly, then CO2 separation efficiency is improved, but ease of operation deteriorates
Solution Approach 1:
The device is designed with modular absorption elements that can be independently removed and replaced. The housing includes access points and mounting mechanisms that allow users to swap sorbent-coated foams or fibers without disassembling the entire device, significantly improving ease of operation while maintaining CO2 separation efficiency.
Solution Approach 2:
The sorbent is pre-coated onto the foam or fiber substrates during manufacturing, creating ready-to-use absorption elements. This preliminary action allows the device to be assembled in a user-friendly manner with simple module insertion, eliminating the need for users to perform complex impregnation procedures while ensuring optimal CO2 separation performance.
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 approach enhances CO2 uptake rates and reduces energy consumption by maintaining efficient CO2 capture for hours or days without additional fluid input, using foams that can withstand alkaline solutions and support fluid flow through capillary action and gravity-driven convection.
Implementation Method 1
using foams that can withstand alkaline solutions and support fluid flow through capillary action and gravity-driven convection
Implementation Method 2
using foams that can withstand alkaline solutions and support fluid flow through capillary action and gravity-driven convection
Implementation Method 3
The use of open-cell foams as air/liquid exchangers, which provide a large surface area for gas-liquid contact
Data Source
AI summary
An air/liquid exchanger comprising an open-cell foam 102 supporting a liquid sorbent. The exchanger may be used for removing trace gaseous components from the air.