Angular Profile Runoff Elements for Fouling-Resistant Mass Transfer
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Solution Overview
Problem
Columns used for mass transfer and energy transfer between liquid and gaseous phases in countercurrent suffer from severe fouling due to polymer formation, particularly in oil scrub columns, which affects the performance and capacity of mass transfer trays.
Innovation Solution
The design incorporates mass transfer trays with angular profile runoff elements and a liquid distributor system featuring cutouts and channels to apply the liquid phase effectively, creating curtains and a two-phase layer, reducing fouling and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mass transfer trays with side-to-side baffles are used, then the column can perform mass transfer and energy transfer, but the trays are highly susceptible to fouling from polymer formation
Solution Approach 1:
The runoff elements are segmented into multiple parallel structures with distinct runoff surfaces, creating separate flow paths for the liquid phase. This segmentation prevents polymer fouling from blocking entire trays, as fouling on one segment does not affect others, while maintaining high mass transfer efficiency through distributed contact between phases
Solution Approach 2:
Instead of having liquid flow horizontally across the tray as in traditional designs, the invention inverts the flow direction by channeling liquid vertically down runoff surfaces that converge toward the column center. This inverted geometry reduces residence time and prevents polymer formation while maintaining effective mass transfer
2Reliability
If the liquid phase is applied uniformly across the tray surface, then coverage is improved, but residence time increases leading to more polymer formation
Solution Approach 1:
The liquid distributor applies liquid selectively to specific locations (edges of runoff elements) rather than uniformly across the entire tray surface. This localized application ensures adequate wetting where needed while minimizing overall liquid residence time on the tray, reducing polymer formation risk
Solution Approach 2:
The invention transitions from two-dimensional liquid distribution across the tray plane to three-dimensional flow along inclined runoff surfaces. Liquid is applied at the edges and flows down angled surfaces toward the center, utilizing the vertical dimension to reduce residence time while maintaining distribution effectiveness
3Ease of operation
If runoff elements with sharp edges are used, then liquid distribution is improved, but structural strength decreases
Solution Approach 1:
The runoff elements feature rounded edges instead of sharp corners, combining the flow-distributing benefits of angular profiles with the structural advantages of curved geometries. The rounded edges prevent stress concentration points while still effectively channeling liquid flow, maintaining both operational effectiveness and structural integrity
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 solution significantly reduces fouling susceptibility, doubles the efficiency, and increases capacity compared to traditional side-to-side baffles, while maintaining high structural strength, ensuring effective mass transfer and energy transfer.
Implementation Method 1
the liquid phase applied to the respective runoff element flows off from the respective runoff element via the runoff surfaces at both sides of the edge
Implementation Method 2
mass transfer and/or energy transfer between a liquid phase and a gaseous phase that is passed in countercurrent to said liquid phase
Implementation Method 3
mass transfer and/or energy transfer between a liquid phase and a gaseous phase that is passed in countercurrent to said liquid phase
Implementation Method 4
the liquid distributor is designed to apply the liquid phase to the edges of the mass transfer elements in a defined manner
Data Source
AI summary
The invention relates to a column having: a shell, which is extended along a longitudinal axis and encloses an interior of the column, at least one mass transfer tray, which is extended along a column cross section, extending transversely to the longitudinal axis, of the column, and at least one liquid distributor, which is designed to feed the at least one mass transfer tray with a liquid phase. In accordance with the invention, the mass transfer tray has a plurality of runoff elements extending parallel to and at a distance from one another, more particularly in the form of angular profiles, which are each extended along the column cross section, where the runoff elements each have first and second runoff surfaces extended along the column cross section, and where the two runoff surfaces converge along the longitudinal axis in the direction of the liquid distributor and meet, and in so doing form an edge extended along the column cross section, and where the liquid distributor is designed to apply the liquid phase to the edges of the runoff elements, so that the liquid phase applied to the respective runoff element flows off from the respective runoff element via the runoff surfaces at both sides of the respective edge.