Heat-Integrated CO2 Capture With Segmented Absorber Packing
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Solution Overview
Problem
Existing carbon dioxide capture processes are inefficient due to temperature bulges in absorber towers, leading to ineffective column sections and high capital and operating costs, as the reaction rate decreases with increasing temperature and gas depletion.
Innovation Solution
A discretized packing arrangement in the absorber tower with varying structured packing segments and random packing distributors to control liquid-gas interface areas and temperature profiles, reducing the ineffective zone and optimizing the entire column height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single type of structured packing is used throughout the absorber tower, then the column height can be minimized, but the temperature bulge causes a large ineffective zone below the bulge, reducing capture efficiency
Solution Approach 1:
The absorber tower is divided into multiple sections with different structured packing types. The top section uses packing with lower liquid-gas interface area to control temperature rise, while the bottom section uses packing with higher liquid-gas interface area to maximize CO2 capture. This segmentation allows each section to perform its specific function optimally, eliminating the ineffective zone caused by temperature bulge while minimizing overall tower height.
Solution Approach 2:
Different sections of the absorber tower are equipped with different types of structured packing tailored to local requirements. The top section employs packing designed for temperature control, while the bottom section uses packing optimized for mass transfer. This local quality approach ensures that each part of the tower has the appropriate characteristics for its specific function, maximizing overall efficiency without requiring excessive height.
2Productivity
If the liquid-gas interface area is maximized throughout the entire column, then CO2 capture rate increases, but the temperature bulge becomes more severe, creating a larger ineffective zone
Solution Approach 1:
The absorber is segmented into top and bottom sections with different packing characteristics. The top section uses packing with lower liquid-gas interface area to limit temperature rise and prevent severe temperature bulge. The bottom section uses packing with higher liquid-gas interface area to maximize CO2 capture rate. This segmentation allows the system to achieve high productivity without suffering from severe temperature bulge that would create ineffective zones.
Solution Approach 2:
The liquid-gas interface area is optimized locally for each section's function. The top section employs packing with interface area suited for temperature control, while the bottom section uses packing with interface area optimized for high capture rate. This local optimization allows the bottom section to achieve high productivity without the temperature bulge problem affecting the entire column.
3Productivity
If the absorber tower height is increased to eliminate the ineffective zone, then CO2 capture efficiency improves, but capital expenditure increases significantly
Solution Approach 1:
By segmenting the absorber into sections with different packing types, the ineffective zone is eliminated without increasing overall tower height. The top section's packing controls temperature to prevent bulge formation, while the bottom section's packing maximizes capture efficiency. This allows the entire tower height to be effectively utilized, achieving high capture efficiency with a compact, cost-effective design.
Solution Approach 2:
Different packing types are applied locally to different sections to optimize performance throughout the tower. The top section uses packing for temperature control, while the bottom section uses packing for maximum mass transfer. This local quality approach ensures that every portion of the tower contributes effectively to CO2 capture, eliminating wasted height and reducing the capital cost associated with taller towers.
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 enhances CO2 capture efficiency by 5-11%, allowing for a smaller absorber tower design, thereby reducing capital and operating costs.
Implementation Method 1
changing the type of structured packing in the absorber tower allows for different liquid-gas interface areas to be applied at different heights of the column
Implementation Method 2
During carbon capture, an exothermic chemical absorption reaction occurs in the absorber tower
Implementation Method 3
a few inches of random packing applied between sections of structured packing as built-in redistributor to cause short sections of higher pressure drop
Data Source
AI summary
An apparatus includes an absorber having a first packing section, a second packing section and a third packing section. The first packing segment includes a first structured packing, having a first specific surface area SA 1, the second packing segment includes a second structured packing, having a second specific surface area SA 2, and the third packing segment includes a third structured packing, having a third specific surface area SA 3 where SA 1<SA 2<SA 3. The structured packing in the various packing segment may be periodically interrupted with one or more layers of random packing.