Monolithic Adsorbent Structure for High-Flow Compressed Gas Drying
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Solution Overview
Problem
Conventional adsorption devices for compressed gas using granular adsorbents face issues such as dust formation, reduced drying capacity, and structural failure due to fluidisation and thermal shocks, especially when the adsorbent becomes saturated and is not adequately regenerated.
Innovation Solution
The use of a monolithic supporting structure with a coating containing an adsorbent, which prevents fluidisation and allows for higher gas flow rates, and can be positioned vertically or horizontally without internal leakage, using materials like ceramic, metal foil, or fibre structures, and adsorbents like zeolites or silica gel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If granular adsorbent is used in conventional adsorption devices, then the device can be manufactured with simple structure, but dust formation occurs and drying capacity is reduced due to fluidisation and grain movement
Solution Approach 1:
The patent employs a monolithic porous support structure with high surface area and porosity to provide adequate adsorption capacity while maintaining structural integrity. The porous nature allows gas flow through the structure while the monolithic form prevents the fluidisation and grain movement that causes dust formation in granular systems.
Solution Approach 2:
The invention uses a composite structure combining a monolithic support material (such as ceramic foam or metallic foam) with an adsorbent coating or impregnation. This composite approach provides both the mechanical strength of the monolithic structure and the adsorption properties of the adsorbent material, eliminating dust formation while maintaining drying capacity.
2Device complexity
If granular adsorbent is used, then the device structure is simple, but structural failure occurs due to fluidisation and thermal shocks when adsorbent becomes saturated
Solution Approach 1:
The monolithic porous support structure provides high mechanical strength and thermal stability while maintaining porosity for gas flow. The interconnected pore structure distributes mechanical and thermal stresses uniformly throughout the material, preventing the structural failure that occurs in granular systems under thermal shock or saturation conditions.
Solution Approach 2:
Instead of using loose granular particles that require containment, the invention inverts the approach by using a continuous monolithic structure with controlled porosity. This inversion eliminates the fluidisation problem entirely, as the solid monolithic structure cannot be fluidised regardless of gas flow conditions or thermal variations.
3Productivity
If gas flow rate is increased to improve productivity, then output increases, but dust formation and fluidisation occur with granular adsorbent
Solution Approach 1:
The monolithic porous structure allows high gas flow rates to pass through without causing fluidisation or dust formation. The porous matrix provides structural support while permitting efficient gas permeation, enabling high productivity operation without the harmful dust generation that plagues granular adsorbent systems at elevated flow rates.
4Reliability
If monolithic structure with adsorbent coating is used, then dust formation is prevented and drying efficiency is maintained, but manufacturing complexity increases
Solution Approach 1:
The monolithic porous support structure can be manufactured using established ceramic foam or metallic foam techniques, followed by adsorbent coating or impregnation processes. While more complex than simple granular filling, these are well-established industrial processes that achieve consistent, high-performance products with superior reliability and no dust formation.
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 solution prevents dust formation and maintains high drying efficiency even under severe conditions, as the monolithic structure does not lose structural strength and maintains adsorption capacity over the adsorbent's lifespan.
Implementation Method 1
an adsorption element which extends along the flow direction of the compressed gas to be treated between the inlet and the outlet and which consists of a monolithic supporting structure that is at least partially provided with a coating that comprises an adsorbent
Implementation Method 2
the monolithic structure does not lose structural strength and maintains adsorption capacity over the adsorbent's lifespan
Data Source
AI summary
An adsorption device for compressed gas, is provided with a vessel with an inlet for the supply of a compressed gas to be treated, and an outlet for treated gas and an adsorption element is affixed in the vessel. The adsorption element extends along the flow direction of the compressed gas to be treated, between the inlet and the outlet. The adsorption element has a monolithic supporting structure that is at least partially provided with a coating that contains an adsorbent.