Rotating Packed Bed for CO2 Capture with Centrifugal Mass Transfer
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Solution Overview
Problem
Conventional CO2 removal systems face inefficiencies due to significant pressure drops, complex equipment setups, high energy consumption, and the need to circulate large amounts of diluted absorbent.
Innovation Solution
The system employs a centrifugal effect in both the absorber and desorber to handle highly viscous and concentrated absorption liquids, reducing the need for extensive piping and instrumentation, and optimizing energy use by operating at higher pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional absorption columns and desorption columns are used, then CO2 removal is achieved, but significant pressure drop occurs in the gas stream
Solution Approach 1:
The patent combines the absorber and desorber into a single rotating packed bed device with functionally different zones. The rotation creates centrifugal forces that enable efficient mass transfer in the absorber zone while allowing pressure buildup in the desorber zone, achieving CO2 removal with minimal overall pressure drop compared to conventional separate column systems
Solution Approach 2:
The rotating packed bed employs dynamic rotation to create centrifugal forces that enhance mass transfer efficiency. The rotation speed can be adjusted to optimize both absorption and desorption processes, allowing the system to maintain high CO2 removal efficiency while minimizing pressure drop through dynamic control of the fluid flow patterns
2Reliability
If conventional plants with multiple process equipment are used, then CO2 removal is achieved, but the system becomes complex with extensive piping and instrumentation
Solution Approach 1:
The patent integrates multiple functions (absorption, desorption, heating, cooling, and CO2 separation) into a single rotating packed bed device. This consolidation eliminates the need for separate columns, heat exchangers, and extensive piping systems found in conventional plants, significantly reducing equipment complexity while maintaining CO2 removal efficiency
Solution Approach 2:
The rotating packed bed serves multiple functions simultaneously: it acts as both absorber and desorber, incorporates heating and cooling zones, and performs CO2 separation all within one device. This multi-functionality reduces the number of separate equipment units needed, simplifying the overall system design and reducing instrumentation requirements
3Reliability
If diluted absorbent is circulated through conventional systems, then CO2 absorption is achieved, but large amounts of energy are consumed for heating and cooling
Solution Approach 1:
The patent uses centrifugal forces generated by rotation to enhance mass transfer coefficients, allowing the use of highly concentrated absorbent solutions. This parameter change in absorbent concentration reduces the volume of liquid that needs to be heated and cooled, significantly lowering energy consumption while maintaining or improving CO2 absorption efficiency
Solution Approach 2:
The rotating packed bed creates different local conditions in different zones: the absorber zone operates with high mass transfer efficiency due to centrifugal forces, while the desorber zone utilizes heat exchange surfaces for efficient regeneration. This local optimization allows the system to achieve high CO2 removal with minimal energy input for heating and cooling
4Quantity of substance
If highly concentrated absorption liquid is used, then circulation volume is reduced, but viscosity increases making handling difficult
Solution Approach 1:
The rotation of the packed bed creates dynamic centrifugal forces that prevent highly viscous, concentrated absorbent solutions from stagnating. The continuous motion enhances mixing and flow characteristics, making it possible to handle and circulate highly concentrated solutions (up to 95% amine concentration) that would be difficult to manage in static conventional systems
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 results in a 30% higher efficiency compared to standard systems, reduced energy consumption (up to 30% less), and a more compact, cost-effective design with lower compressor investments.
Implementation Method 1
The apparatus operates by utilizing a centrifugal force generated by a rotation of the apparatus
Implementation Method 2
an absorption liquid is supplied to an absorption section... where the gas is contacted counter-currently to an absorbent flowing downwards
Implementation Method 3
The absorbent rich in CO2 is stripped by steam moving up the tower
Implementation Method 4
The absorbent rich in CO2 is pumped to the top of a desorption column via a heat recovery heat exchanger rendering the rich absorbent pre-heated before entering the desorption tower
Data Source
AI summary
Systems and methods are provided for performing amine capture on a heated flue gas using multiple rotating packed beds. By integrating a series of rotating packed beds to perform cooling of the flue gas, removal of CO2 from the flue gas by contact with an aqueous amine, and washing of the gaseous effluent from CO2 removal step to remove any entrained amine, the equipment footprint and overall equipment volume required for CO2 capture can be significantly reduced. The integration of cooling, CO2 removal, and washing can be integrated into a series of packed beds in part by using different packing materials in the various packed beds.