Rotary Sorbent Bed Sealing for Continuous Direct Air CO2 Capture
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Solution Overview
Problem
Existing direct air capture systems face challenges with low CO2 concentration in the atmosphere, leading to high material and energy costs, complex process flow management, mechanical reliability issues, and scalability limitations in sorbent movement and sealing designs.
Innovation Solution
A rotary sorbent bed configuration with a sealed desorption zone and continuous rotation, using a wheel framework structure to support monoliths, allowing controlled gas flows and minimizing energy consumption by maintaining positive pressure within the desorption zone, reducing mechanical complexity, and avoiding oxygen exposure during desorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed volume sorbent environment is used with sequential flow streams, then CO2 capture efficiency is improved, but process flow management complexity increases
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static fixed-volume sorbent environment to a dynamic rotating sorbent bed system. The sorbent bed rotates continuously, dynamically exposing different portions to air flow and desorption zones, eliminating the need for complex sequential flow switching while maintaining high CO2 capture efficiency.
Solution Approach 2:
The rotating sorbent bed is segmented into multiple independent sections that can operate simultaneously. This segmentation allows parallel processing of multiple air streams without requiring complex flow management, as each segment functions independently while contributing to overall CO2 capture productivity.
2Productivity
If multiple parallel sorbent beds are used for continuous CO2 removal, then continuous CO2 capture is achieved, but piping and manifold complexity increases
Solution Approach 1:
The patent merges multiple sorbent bed functions into a single rotating structure. Instead of requiring separate piping and manifolds for multiple parallel beds, the rotating bed integrates all sorbent sections into one unified system with simplified stationary piping that serves the entire rotating assembly.
Solution Approach 2:
The dynamic rotation of the sorbent bed enables continuous CO2 capture without requiring multiple stationary beds. The continuous motion allows different portions of the same bed to perform sorption, desorption, and regeneration functions sequentially, achieving continuous operation with a single integrated structure rather than multiple parallel systems.
3Ease of operation
If sorbent is allowed to move to simplify gas flow handling, then gas flow management is simplified, but mechanical reliability decreases
Solution Approach 1:
The patent implements controlled dynamic movement of the sorbent bed through rotation. This movement simplifies gas flow management by allowing stationary piping to interface with the rotating bed through reliable rotary seals, rather than requiring complex movable piping. The systematic rotation provides predictable mechanical behavior that enhances reliability compared to linear reciprocating motion.
Solution Approach 2:
The patent replaces complex movable piping systems with a stationary piping configuration that interfaces with the rotating sorbent bed through rotary seals. This substitution eliminates the need for flexible hoses and mechanical swivel joints, replacing them with more reliable rotary sealing mechanisms that maintain gas flow integrity while accommodating the moving sorbent bed.
4Ease of operation
If conventional linear movement of sorbent beds is used, then gas flow handling is simplified, but unproductive movement time increases
Solution Approach 1:
The rotating sorbent bed performs preliminary positioning of sorbent sections before they enter the air contact zone. As sections rotate into position, they are pre-aligned with the stationary piping and seals, eliminating unproductive movement time. The continuous rotation ensures that sorbent sections are always in the optimal position for their current operational phase.
Solution Approach 2:
The continuous rotation of the sorbent bed eliminates idle periods between operational cycles. Unlike linear systems that require stop-start motion, the rotating bed maintains continuous motion, ensuring that all sorbent sections are constantly engaged in some productive phase (sorption, desorption, or regeneration), maximizing utilization and eliminating unproductive movement time.
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 enables efficient, continuous CO2 capture with reduced energy costs and mechanical reliability, minimizing pressure drops and oxygen exposure, while maintaining high purity CO2 recovery.
Implementation Method 1
achieving a high loading of CO2 at fast adsorbent rates in an adsorbent
Implementation Method 2
exposing a second portion of the sorbent bed to a plurality of gas flows within the desorption zone volume
Data Source
AI summary
Systems and methods are provided for performing direct air capture using a rotary sorbent bed configuration. The rotary sorbent bed is supported on a wheel that serves as a framework structure for supporting the sorbent bed. The sorbent bed can include one or more monoliths that form the support material for the sorbent bed, and a sorbent supported on the one or more monoliths. The rotational path of the sorbent bed passes through the enclosure that allows for sealing of the portion of the sorbent bed within the enclosure. Optionally, the enclosure can contain a plurality of sub-zones that facilitate temperature control and/or pressure control within the enclosure while allowing for recovery of a high purity CO2 stream from the desorption zone. The rotary sorbent bed configuration can allow for continuous or semi-continuous capture of CO2 while reducing or minimizing contact of the sorbent bed with oxygen at elevated temperature.