Two-stage liquid distribution device for mass transfer column
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Solution Overview
Problem
Mass transfer columns in offshore applications experience liquid maldistribution due to wave and wind-induced rocking, leading to uneven distribution of liquid streams and reduced mass transfer and heat exchange efficiency.
Innovation Solution
A two-stage liquid distribution device with lower and upper distributors, utilizing enclosed troughs and parting boxes with discharge apertures and flow restrictors to create a pressurized discharge, ensuring uniform liquid distribution to the mass transfer bed, even under rocking conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional liquid distributor is used in offshore mass transfer columns, then the device structure is simple, but liquid maldistribution occurs due to wave and wind-induced rocking
Solution Approach 1:
The liquid distributor is divided into multiple independent troughs (at least three troughs arranged circumferentially), each capable of independently receiving and distributing liquid. This segmentation allows each trough to maintain liquid distribution function even when the column experiences rocking motion, preventing overall maldistribution while maintaining reasonable structural complexity.
2Reliability
If the liquid distributor is designed to be robust against rocking, then liquid distribution uniformity improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The troughs are designed to automatically adjust and maintain liquid distribution through their own geometry and positioning. The circumferential arrangement and specific dimensions of each trough enable them to self-compensate for rocking motions without requiring external active control systems or complex mechanical adjustments, thereby improving reliability while maintaining ease of manufacture.
3Reliability
If multiple troughs are used to improve distribution uniformity, then liquid distribution improves, but the device complexity increases
Solution Approach 1:
Each trough serves multiple functions: receiving liquid from the column, maintaining liquid level during rocking, distributing liquid uniformly across its width, and providing structural support. This multi-functionality reduces the need for additional separate components, thereby improving distribution uniformity while limiting the increase in overall device complexity.
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 two-stage liquid distribution system maintains uniform liquid distribution across the mass transfer bed, enhancing mass transfer and heat exchange efficiency by utilizing hydraulic heads to counteract rocking motions and prevent maldistribution.
Implementation Method 1
utilizing hydraulic heads to counteract rocking motions and prevent maldistribution
Implementation Method 2
create a pressurized discharge, ensuring uniform liquid distribution
Data Source
AI summary
A two-stage liquid distribution device for use within an internal region of a mass transfer column to distribute liquid to an underlying mass transfer bed. The two-stage liquid distribution device includes a lower distributor with a lower parting box and lower troughs and an upper distributor with an upper parting box and upper troughs. The lower and upper parting boxes and troughs are enclosed to allow a liquid head in a lower downpipe section and an upper downpipe section that feed liquid to the lower distributor and the upper distributor to cause pressurization of liquid within the lower and upper parting boxes and troughs. The pressurization makes the lower and upper distributors less susceptible to rocking motion of the mass transfer column and reduces any maldistribution of liquid discharged from the lower and upper troughs to the mass transfer bed.