Steam-Driven CO2 Capture Sorbent Regeneration
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Solution Overview
Problem
Current methods for carbon dioxide capture through direct air capture (DAC) face challenges in efficiently regenerating sorbents due to poor heat transfer in granular beds and sorbent degradation, especially when using steam desorption, which leads to reduced CO2 uptake capacity and operational lifetime, making them economically unfeasible.
Innovation Solution
A method utilizing steam as the exclusive energy source for desorption in DAC processes, involving a specific sequence of steps including evacuation, steam injection, and pressure control to maintain optimal temperature and pressure conditions, ensuring efficient and cyclic operation of sorbents without additional heat input, thereby preventing sorbent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam is used for desorption to provide heating energy, then desorption efficiency is improved, but sorbent degradation occurs and operational lifetime is reduced
Solution Approach 1:
The patent controls steam parameters (temperature, pressure, flow rate) to optimize desorption while preventing sorbent degradation. By adjusting these parameters, the process achieves efficient CO2 release without exposing the sorbent to conditions that would reduce its lifetime
Solution Approach 2:
The patent implements cyclic operation with periodic steam injection followed by drying phases. This periodic action allows the sorbent to be regenerated efficiently while having recovery time, maintaining both high productivity and long operational lifetime
2Temperature
If steam is used for desorption to enable fast and uniform heating, then heating efficiency is improved, but water deposition in sorbent increases and may wash out active phase
Solution Approach 1:
The patent implements continuous drying action immediately following steam desorption. This continuous useful action removes deposited water before it can wash out the active phase, maintaining temperature uniformity benefits while preventing substance loss
Solution Approach 2:
The patent rapidly removes excess water through vacuum drying and gas flow techniques, rushing through the dangerous phase where water accumulation could wash out active phase components
3Stability of the object's composition
If conductive heating is used to avoid near saturation instabilities, then process stability is improved, but heat transfer through granular beds is poor and extensive heating causes sorbent degradation
Solution Approach 1:
The patent uses steam as an intermediary heating medium that condenses on the sorbent surface, providing efficient heat transfer without the need for direct conductive heating through the entire granular bed. This mediator approach maintains process stability while reducing sorbent exposure to degrading high temperatures
Solution Approach 2:
The patent exploits the phase transition of steam to condensed water during desorption. This phase change releases latent heat directly at the sorbent surface, providing stable and efficient heating without the drawbacks of conductive heating through the granular bed
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 enables economically viable and efficient cyclic adsorption and desorption of CO2, maintaining sorbent performance and extending its operational lifetime by optimizing steam usage and sorbent conditions, thus overcoming the limitations of previous methods.
Implementation Method 1
conductive heating can be easily controlled, avoids near saturation instabilities
Implementation Method 2
steam desorption methods allow for fast and uniform heating of the sorbent
Implementation Method 3
Gas separation by adsorption/desorption processes, more specifically the capture of carbon dioxide from atmospheric air
Implementation Method 4
the unit being evacuable to a vacuum pressure of 400 mbarabs or less
Data Source
AI summary
A method for separating gaseous carbon dioxide from a gas mixture by cyclic adsorption/desorption using a sorbent material adsorbing said gaseous carbon dioxide, wherein the method comprises the following sequential and in this sequence repeating steps:(a) an adsorption step;(b) and isolating step;(c) injecting a stream of saturated or superheated steam and thereby inducing an increase in internal pressure of the reactor unit and an increase of the temperature of the sorbent from ambient atmospheric temperature to a temperature between 60 and 110° C., starting the desorption of CO2;(d) extracting at least the desorbed gaseous carbon dioxide from the unit and separating gaseous carbon dioxide from water by condensation in or downstream of the unit, while preferably still injecting;(e) bringing the sorbent material to ambient atmospheric pressure conditions and ambient atmospheric temperature conditions