Passive CO2 Transfer Membrane Using Gravity and Convection
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Solution Overview
Problem
Existing methods for transferring carbon dioxide into water, such as those used in algal growth systems or carbon sequestration, often rely on energy-consuming equipment, resulting in minimal net carbon benefit and requiring large processing areas for efficient surface area contact.
Innovation Solution
A gas exchange apparatus featuring a porous membrane separating water feed rods from gas feed rods, allowing for carbon dioxide transfer through natural diffusion without the need for mechanical devices, utilizing gravity and convection to drive the process, and minimizing additional carbon release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If energy-consuming equipment such as pumps or blowers is used to increase water exposure to air for CO2 transfer, then the transfer efficiency of CO2 into water is improved, but the net carbon benefit deteriorates due to carbon dioxide generated by the power consuming devices
Solution Approach 1:
The system uses natural convection and gravity-driven flow to achieve CO2 transfer without external power input. The countercurrent flow between water and gas phases is self-sustaining, eliminating the need for pumps or blowers and avoiding associated carbon emissions.
Solution Approach 2:
The patent replaces mechanical systems (pumps, blowers) with natural physical processes (convection, gravity-driven flow). The countercurrent exchange mechanism achieves CO2 transfer through passive mass transfer driven by concentration gradients and natural fluid movement.
2Productivity
If large processing areas are used to achieve sufficient surface area contact between CO2 containing gas and water, then the CO2 transfer efficiency is improved, but the device complexity and space requirement increase
Solution Approach 1:
The patent transitions from horizontal surface contact to vertical countercurrent flow through a packed column. This dimensional change allows CO2 transfer to occur along the entire height of the column, dramatically increasing the effective contact surface area within a compact footprint.
Solution Approach 2:
The use of packed bed materials (porous structures) within the column provides extensive surface area for gas-liquid contact. The packed material creates numerous interfaces between rising gas and falling water, enhancing mass transfer efficiency without requiring large external dimensions.
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 apparatus efficiently sequesters carbon dioxide from flue gases into water with a low carbon footprint, achieving net carbon negativity by eliminating the need for power-consuming machinery and optimizing surface area contact through a porous membrane configuration.
Implementation Method 1
allowing for carbon dioxide transfer through natural diffusion without the need for mechanical devices
Implementation Method 2
utilizing gravity and convection to drive the process
Implementation Method 3
utilizing gravity and convection to drive the process
Data Source
AI summary
A passive gas exchange transfer apparatus for exchanging carbon dioxide from a flue gas to a water supply is disclosed. The apparatus includes several upper rods and several lower rods to hold a membrane in place. The membrane provides increased surface area for the gas and the water to meet. The upper rods may be the source of the water supply, and the lower rods may be the source of the gas. The upper rods may disperse the water onto one side of the membrane, and the lower rods may disperse the gas onto the other side. The two may therefore meet at the surface created by the membrane as gravity draws the water downward, and convection draws the gas upward.