Segmented Particle Adsorbent Bed for Low-Pressure Gas Separation
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Solution Overview
Problem
Existing gas separation systems for capturing CO2 from atmospheric air face challenges in achieving low pressure drop while maintaining effective mass transfer, especially due to the low concentration of CO2 in air, which requires large air volumes to be processed, leading to high energy consumption and inefficiencies in current sorbent bed configurations.
Innovation Solution
A gas separation unit utilizing a cyclic adsorption/desorption process with loose particulate sorbent material arranged in stacked layers of flexible fabric material, where the sorbent material is held within a frame structure with a unique arrangement of heat exchange pipes and attachment elements to minimize pressure drop and enhance stability, allowing for efficient CO2 capture from air and other gas streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional packed bed columns or fluidized beds are used for CO2 capture, then mass transfer contact between sorbent and gas stream is achieved, but pressure drop increases significantly leading to high energy consumption
Solution Approach 1:
The sorbent bed is segmented into multiple shallow layers (typically 3-10 layers) rather than using a single deep bed. Each layer has a thickness of only a few millimeters to 1 cm, which dramatically reduces the pressure drop across each layer while maintaining adequate contact time for mass transfer. The segmented structure allows gas to flow through multiple shallower paths instead of one long path, reducing overall energy requirements for gas pumping.
Solution Approach 2:
The invention transitions from a conventional vertical deep-bed configuration to a horizontal or multi-layer stacked configuration. By spreading the sorbent capacity across multiple layers in the horizontal dimension rather than increasing vertical depth, the system maintains high CO2 capture capacity while reducing the linear flow path length and associated pressure drop in the vertical dimension.
2Productivity
If large air volumes are processed to capture CO2 from atmospheric air, then CO2 capture quantity increases, but pressure drop and energy consumption increase proportionally
Solution Approach 1:
The system processes large air volumes through multiple segmented layers, each optimized for low pressure drop. The segmentation allows parallel flow paths that reduce resistance to gas flow, enabling high productivity (large air throughput) without proportional increases in energy consumption for pumping.
Solution Approach 2:
The invention changes key physical parameters including layer thickness (reduced to mm-cm range), number of layers (increased to 3-10), and layer spacing (optimized for gas flow). These parameter changes enable the system to handle large air volumes efficiently by reducing flow resistance while maintaining adequate residence time for CO2 adsorption.
3Quantity of substance
If sorbent material is densely packed to maximize contact, then mass transfer is enhanced, but pressure drop increases
Solution Approach 1:
Instead of densely packing a single deep bed, the invention segments the sorbent into multiple shallow layers. Each layer maintains adequate sorbent density for mass transfer, but the shallow depth prevents excessive pressure drop accumulation. The segmentation decouples the relationship between sorbent quantity and pressure drop that exists in conventional deep-bed systems.
Solution Approach 2:
The invention uses multiple layers with moderate sorbent density rather than one layer with excessive density. This partial action approach distributes the adsorption function across multiple layers, each operating at optimal but not excessive packing density, achieving high overall contact efficiency without the pressure drop penalties of overly dense single beds.
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 solution reduces energy requirements for air pumping by minimizing pressure drop and optimizing mass transfer, enabling economically feasible CO2 capture from large air volumes with improved stability and efficiency in the gas separation process.
Implementation Method 1
a cyclic adsorption/desorption process using a loose particulate sorbent material for gas adsorption
Implementation Method 2
a unique arrangement of heat exchange pipes and attachment elements to minimize pressure drop and enhance stability
Data Source
AI summary
A gas separation unit for the separation of a first gas, carbon dioxide, from a mixture, by using an adsorption/desorption process using a loose particulate sorbent material arranged in at least two stacked layers. The primary heat exchange piping is arranged on the two outer edges of the layer within the cavity extending along a longitudinal direction. Further, an essentially parallel array of secondary heat exchange pipes is provided, the secondary heat exchange pipes extending along a transverse direction. The first diameter of the secondary heat exchange pipes is at least twice as large as the second outer diameter of the secondary heat exchange pipes and the secondary heat exchange pipes are in thermal contact with sheets of metal which extend oscillating between pairwise adjacent secondary heat exchange pipes.