Composite Adsorption Bed with PCM Agglomerates for PSA Thermal Management
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Solution Overview
Problem
Industrial PSA processes face challenges in effectively using microencapsulated phase change materials (PCMs) due to their inability to maintain homogeneity and stability within adsorbent beds, especially in processes with short cycle times, leading to thermal fluctuations that affect separation performance.
Innovation Solution
The use of PCM agglomerates with specific density and diameter ratios mixed with adsorbent particles to form composite beds, where the PCM agglomerates have a thermal conductivity greater than 0.5 W/(m·K, and are designed to remain homogeneous over time and space, utilizing metallization to enhance thermal conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If microencapsulated PCMs are used in PSA beds, then thermal fluctuations are reduced, but homogeneity and stability of the bed are compromised
Solution Approach 1:
The PCM is segmented into microcapsules that are then agglomerated into larger particles with controlled size and density. This segmentation allows the PCM to be distributed uniformly throughout the adsorbent bed while maintaining bed stability. The microcapsules are embedded within agglomerate structures that prevent them from migrating or segregating during PSA cycling.
Solution Approach 2:
The invention creates a composite bed structure combining adsorbent particles with PCM-containing agglomerates. The agglomerates themselves are composite structures with a binder matrix embedding the PCM microcapsules. This composite approach allows simultaneous achievement of thermal regulation functionality and mechanical bed stability.
2Temperature
If PCM particles are added to adsorbent bed, then thermal dynamics are improved, but particle segregation occurs over time
Solution Approach 1:
The PCM microcapsules are pre-agglomerated with binder materials before being introduced to the adsorbent bed. This preliminary agglomeration creates particles with optimized density and size characteristics that match the adsorbent particles, ensuring uniform distribution from the start and preventing subsequent segregation during prolonged operation.
3Temperature
If PCM microcapsules are used, then phase change thermal storage is enabled, but thermal conductivity is insufficient
Solution Approach 1:
The agglomerate structure serves as a thermal conduction network, with the binder material and agglomerate geometry providing thermal pathways between PCM microcapsules. This composite architecture enables the low-conductivity PCM to function effectively by providing external thermal conduction routes through the agglomerate structure.
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 the thermal dynamics of PSA units by maintaining homogeneity and stability, improving thermal conductivity and reducing thermal fluctuations, thereby increasing separation efficiency and productivity.
Implementation Method 1
particles of at least one phase change material (PCM), said PCM particles being in the form of agglomerates of several PCM microcapsules
Implementation Method 2
utilizing metallization to enhance thermal conductivity and stability
Implementation Method 3
processes for gas separation by pressure swing adsorption such as the PSA (Pressure Swing Adsorption) process... rely on the phenomenon of physical adsorption
Implementation Method 4
the PCM agglomerates have a thermal conductivity greater than 0.5 W/(m·K, and are designed to remain homogeneous over time and space, utilizing metallization to enhance thermal conductivity
Data Source
AI summary
A thermocyclic process having a short cycle time, typically a cycle time of less 30 minutes, especially a PSA (Pressure Swing Adsorption) process, using agglomerates that contain phase change materials (PCMs), so as to reduce the thermal effects that said thermocyclic process is subjected to during each cycle is provide.