Microwave Desorption for Direct Air Capture
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Solution Overview
Problem
Current direct air capture technologies using solid sorbents are energy-intensive and costly due to high thermal energy requirements for CO2 desorption, making large-scale, affordable CO2 capture from the atmosphere economically unfeasible.
Innovation Solution
A direct air capture system utilizing a microwave cavity with a sorbent structure containing porous support structures coated with CO2 adsorbent materials, where microwave heating efficiently desorbs CO2, reducing energy consumption and increasing desorption speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thermal heating is used for CO2 desorption from solid sorbents, then CO2 can be released from the sorbent, but the energy consumption becomes prohibitively high and the process becomes economically unfeasible
Solution Approach 1:
The patent replaces conventional thermal heating systems with a microwave heating system. The microwave generator emits microwave energy that directly heats the solid sorbent material, enabling CO2 desorption at lower overall energy consumption. This substitution of heating mechanism reduces the 80% energy requirement for regeneration while maintaining effective CO2 release from the sorbent.
2Speed
If high temperature thermal heating is applied for rapid CO2 desorption, then desorption speed increases, but the cooling time and energy requirement increase significantly
Solution Approach 1:
The microwave heating system provides rapid and controlled heating that achieves fast CO2 desorption without requiring extreme temperatures. The microwave energy is absorbed directly by the sorbent material, enabling quick desorption followed by faster cooling, thus reducing the overall cycle time and addressing the time loss associated with conventional high-temperature thermal processes.
3Loss of energy
If conventional thermal heating is used for sorbent regeneration, then CO2 can be desorbed, but the operating cost exceeds $600 per ton of CO2 captured
Solution Approach 1:
The patent employs microwave heating technology to replace conventional thermal heating for sorbent regeneration. The microwave generator delivers energy directly to the sorbent material, achieving effective CO2 desorption at lower energy consumption. This reduction in regeneration energy requirement directly lowers the operating cost from over $600 per ton to potentially below the target threshold, making the direct air capture technology economically viable.
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 system achieves efficient and fast CO2 desorption with significantly reduced energy costs, enabling scalable and affordable CO2 capture from the atmosphere, with the potential to lower the cost per ton of captured CO2 below $100.
Implementation Method 1
The microwave heating unit is turned to an on configuration to heat the CO2 adsorbent material with adsorbed CO2 until a desorption temperature is reached, releasing the CO2 out the downstream end and regenerating the CO2 adsorbent material.
Implementation Method 2
The ambient air is drawn into the upstream end of the chamber and passes through the pores and channels of the porous support structure with the CO2 within the air contacting and being adsorbed by the CO2 adsorbent material.
Data Source
AI summary
A direct air capture of CO2 system and method including a chamber defining a microwave cavity, a microwave heating unit coupled to the chamber in electromagnetic communication, and a sorbent structure carried within the chamber. The sorbent structure includes one or more porous support structures each having a plurality of pores and channels formed therethrough providing a large area of surfaces coated by nanoparticles of CO2 adsorbent material. A motor fan creates an air flow through the chamber and the sorbent structure carried therein. CO2 in the air is adsorbed by the CO2 adsorbent material. The microwave heating unit heats the CO2 adsorbent material to desorb the CO2 for further sequestration or value-added utilization.