Vapor Distributor with Polygonal Deflectors for Mass Transfer Columns
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Solution Overview
Problem
Existing vapor distributors for mass transfer columns, particularly in severe conditions like fouling, coking, erosion, and corrosion, fail to effectively redistribute vapor streams in an upward direction due to their circular cross-section deflectors, which deflect significant portions downward and cannot be optimized by changing the rotational positioning of deflectors.
Innovation Solution
A vapor distributor with elongated deflectors having non-circular cross-sections arranged in a descending array, held by braces, where each deflector's deflecting surface faces the radial inlet and can be positioned to redirect vapor streams upwardly, allowing for optimized redistribution across the column's cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circular cross-section deflectors are used in a ladder-type vapor distributor, then the deflectors inhibit deposition of material from the vapor stream, but significant portions of the vapor stream are deflected in the downward direction rather than in the desired upward direction
Solution Approach 1:
The patent applies asymmetry by replacing the symmetric circular cross-section deflectors with asymmetric multi-sided polygonal cross-section deflectors. Specifically, each deflector has a cross-section with an odd number of sides (3, 5, or 7 sides) where the deflecting surface is positioned to redirect vapor flow upward. This asymmetric geometry maintains the advantage of preventing material deposition while fundamentally changing the flow redirection capability to achieve the desired upward vapor distribution.
2Ease of manufacture
If circular cross-section deflectors with convex deflecting surfaces are used, then the deflectors are simple in structure, but the deflecting surface area remains constant and cannot be varied to improve vapor redistribution by changing rotational positioning
Solution Approach 1:
The patent applies dynamics by enabling the deflectors to be rotated to different angular positions during assembly. The multi-sided polygonal cross-section deflectors can be rotated to various orientations, allowing the deflecting surfaces to be positioned at different angles relative to the radial inlet. This rotational flexibility provides adaptability to optimize vapor redistribution patterns while maintaining manufacturing simplicity through the use of standard polygonal geometries that can be easily fabricated and assembled at different orientations.
3Productivity
If elongated deflectors with non-circular cross-sections are used, then vapor stream redistribution is improved in the upward direction, but the device complexity increases due to the need for braces to hold deflectors in spaced apart relationship
Solution Approach 1:
The patent applies segmentation by dividing the vapor distributor into discrete modular components: individual elongated deflectors with non-circular cross-sections and separate brace elements. Each deflector is an independent unit that can be manufactured and positioned separately, then assembled into the complete vapor distributor structure. This segmentation allows for simplified manufacturing of individual components while enabling complex overall functionality through the coordinated arrangement of multiple deflectors held in spaced-apart relationships by the braces.
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 vapor distributor effectively reduces radial velocity and uniformly redistributes vapor streams upwardly, enhancing mass transfer efficiency while resisting severe conditions such as fouling, coking, erosion, and corrosion in refining, petrochemical, and chemical processes.
Implementation Method 1
each deflector presents a convex deflecting surface facing toward the radial inlet that redirects the radial flow of the vapor stream in upward and downward directions
Data Source
AI summary
A vapor distributor for use in an internal region of a mass transfer column to receive and redistribute a vapor stream when it is introduced radially into the internal region through a radial inlet in a shell of the mass transfer column. The vapor distributor includes a plurality of multiple-sided elongated deflectors arranged in a descending array and a pair of braces that extend longitudinally across the array of elongated deflectors and hold them in spaced apart and side-by-side relationship to each other. Each of the elongated deflectors has a deflecting surface that faces toward the radial inlet to redirect and redistribute the radially-introduced vapor stream. The braces each include a strut that may also redirect and redistribute the vapor stream.