Spacing Element for Vapor-Liquid Tray Dead Zone Reduction
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Solution Overview
Problem
Vapor-liquid contacting trays in distillation columns suffer from reduced capacity and mass transfer efficiency due to dead zones created by support structures, which block vapor flow and reduce the active contact area, necessitating a solution to enhance active area utilization without impeding liquid flow.
Innovation Solution
A spacing element is introduced between the vapor-liquid contacting tray and its support to elevate the tray, creating a gap that activates previously blocked perforations, thereby increasing the active area and reducing dead zones, while maintaining structural integrity and liquid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a support ring is attached to provide support for the vapor-liquid contacting tray, then the tray is kept in position, but the support ring creates dead zones around the perimeter of the tray where little or no vapor-liquid contact occurs
Solution Approach 1:
The support ring is segmented into discrete support points rather than a continuous structure. This allows vapor to flow through the gaps between support points, activating previously blocked perforations and eliminating dead zones while maintaining tray stability
Solution Approach 2:
The support structure is repositioned from a two-dimensional ring at the tray level to a three-dimensional configuration with support elements extending vertically. This dimensional change creates clearance space that allows vapor flow and eliminates the dead zone problem
2Reliability
If a support beam is attached to the support ring or column wall to provide additional support for large trays, then the tray is adequately supported, but the area of the tray directly above the support beam becomes a dead zone due to blockage of vapor flow
Solution Approach 1:
The support beam is extracted or removed from the traditional configuration. Instead of having the beam directly beneath the tray creating a dead zone, the support function is achieved through alternative means that do not block vapor flow paths
Solution Approach 2:
The support structure is repositioned from a two-dimensional beam directly beneath the tray to a three-dimensional configuration that provides support without blocking vapor flow, eliminating the dead zone above the support structure
3Reliability
If the tray support ring blocks a large amount of active area, then the tray is securely supported, but the active cross-sectional area is reduced, decreasing tray capacity
Solution Approach 1:
The continuous support ring is segmented into discrete support elements spaced around the tray perimeter. This segmentation maintains secure support while minimizing the total area blocked, thereby preserving active cross-sectional area and tray capacity
Solution Approach 2:
Support is provided locally at specific strategic points rather than uniformly across the entire tray. This localized support approach maintains tray stability while maximizing the active area available for vapor-liquid contact and mass transfer
Data Source
AI summary
The invention involves a spacing element situated between a vapor-liquid contacting tray and a tray support to reduce the dead zone typically caused by the tray supports blocking of the perforations in the vapor-liquid contacting tray directly above the tray support.