Divided Wall Column Liquid Distributor Decoupling
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Solution Overview
Problem
Conventional divided wall columns face performance issues due to manufacturing defects and deformations of the divided wall, which can cause mis-alignment of column internals, leading to maldistribution of vapor and liquid streams and reduced separation efficiency.
Innovation Solution
Decoupling column internals, such as liquid distributors, from the divided wall by fixing them only to the column shell, thereby minimizing the impact of manufacturing defects and deformations on their alignment and distribution performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If column internals are fixed to the divided wall, then structural support is provided, but manufacturing defects and deformations of the divided wall cause mis-alignment of column internals
Solution Approach 1:
The column internals are segmented into multiple support points along the column shell, rather than being continuously supported by the divided wall. This segmentation allows the divided wall to deform without transmitting mis-alignment forces to the column internals, as each support point operates independently.
Solution Approach 2:
The column internals are extracted from the divided wall support system and reattached to the column shell. This separation removes the coupling between divided wall deformation and column internal alignment, allowing the divided wall to serve its primary function without compromising the precision of vapor and liquid distribution.
2Ease of manufacture
If column internals are fixed to the divided wall, then installation is simplified, but deformations under high temperatures and stress cause maldistribution of vapor and liquid
Solution Approach 1:
The column shell serves as an intermediary support structure between the divided wall and the column internals. By routing support through the column shell rather than direct attachment to the divided wall, the system maintains installation simplicity while eliminating the transmission of thermal and mechanical stresses that cause mis-alignment.
3Device complexity
If divided wall is used to separate three-component feedstream, then equipment cost is reduced compared to multiple columns, but manufacturing defects cause reduced separation efficiency
Solution Approach 1:
The support structure is segmented into discrete points along the column shell, allowing the divided wall to be manufactured and installed as a separate component. This segmentation reduces the impact of manufacturing defects in the divided wall on the overall separation efficiency, as local defects do not propagate mis-alignment throughout the entire column internal structure.
Data Source
AI summary
A divided wall column includes: a column shell; a divided wall provided vertically inside the column shell, defining a divided wall section between an upper edge and a lower edge of the divided wall; and a liquid distributor provided within the divided wall section. The liquid distributor is fixed only to the column shell but not to the divided wall. By using the divided wall column, a defect involved in conventional divided wall columns, i.e. a maldistribution of fluid over mass transfer elements caused by a manufacturing defect of the divided wall resulted from its manufacturing process and/or a deformation thereof under operation conditions, can be minimized or even avoided.