Co-current Vapor-Liquid Contacting Stages with Secured Demister
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Solution Overview
Problem
Conventional vapor-liquid contacting devices face issues with structural integrity and ease of installation, leading to potential fluid leakage and reduced efficiency due to maldistribution of liquid or vapor, which compromises capacity and efficiency in fractional distillation processes.
Innovation Solution
The development of improved co-current contacting stages with enhanced structural features, including secured demister and downcomer configurations, and interconnecting side plates, which form co-current flow channels to minimize bypassing and ensure stable fluid flow, thereby maintaining high capacity and efficiency while reducing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional vapor-liquid contacting devices are used, then structural simplicity is maintained, but structural integrity deteriorates leading to potential fluid leakage
Solution Approach 1:
The contacting stage is divided into modular components including demister rows with individual demister units, downcomers, and receiving pans that can be independently manufactured and assembled. This segmentation allows for improved structural integrity of each component while maintaining overall system manageability through standardized connections.
Solution Approach 2:
Multiple functional elements are combined into integrated assemblies - demister units incorporate both separation functionality and structural support elements, while downcomers integrate flow distribution and structural stabilization functions. This merging reduces the number of separate parts while enhancing overall structural integrity.
2Ease of operation
If conventional contacting devices are used, then ease of installation is compromised, but manufacturing simplicity is maintained
Solution Approach 1:
The contacting stage components are segmented into standardized modules with consistent connection interfaces. Demister rows, downcomers, and receiving pans are designed as separate assemblies that can be manufactured independently using standard fabrication processes, then easily assembled on-site with minimal complex installation requirements.
Solution Approach 2:
Standardized connection details and modular component designs create universal interfaces that simplify installation procedures. The same connection methods and mounting arrangements can be applied across different contacting stage configurations, reducing installation complexity while maintaining manufacturing flexibility.
3Productivity
If conventional tray structures are used, then fluid distribution is maintained, but maldistribution of liquid or vapor occurs leading to reduced efficiency
Solution Approach 1:
The downcomer outlets and demister inlet surfaces are positioned and configured to create localized flow patterns that promote uniform distribution across the contacting stage. The structural arrangement ensures that liquid and vapor phases are distributed evenly to specific regions, preventing maldistribution while maintaining high productivity through optimized local flow characteristics.
4Loss of energy
If conventional contacting devices are used, then pressure drop is not optimized, but structural simplicity is maintained
Solution Approach 1:
The contacting stage utilizes three-dimensional co-current flow channels formed by the spatial arrangement of demister rows and downcomers. This dimensional configuration allows vapor and liquid to flow together through optimized pathways, reducing pressure drop by eliminating counter-current resistance while the modular structure maintains reasonable complexity levels through standardized component arrangements.
Data Source
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AI summary
Improved contacting stages for carrying out vapor-liquid contacting are described. Particular aspects are directed to co-current vapor-liquid contacting devices with non-parallel contacting stages that provide an efficient usage of column space for fluid flow and contacting, in order to achieve high capacity, high efficiency, and low pressure drop. The fabrication of such contacting stages is improved using one or more structural enhancements, preferably a combination of enhancements, to achieve easy installation and significantly improved rigidity between the various parts and thereby avoid movement/separation of these parts. This reduces the possibility of fluid leakage across, and consequently vapor and/or liquid bypassing of, the contacting stage.