Valve Tray Orifice Sizing for Low Pressure Drop Distillation
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Solution Overview
Problem
Conventional fluid-fluid contacting trays in distillation columns face inefficiencies due to high pressure drop, fluid hold-up, and instability, particularly when operating pressures increase, leading to premature flooding and reduced mass transfer efficiency.
Innovation Solution
The introduction of a valve tray assembly with a tray surface featuring apertures of selectively reduced size, incorporating a retaining cage and valve cover with vanes that direct ascending fluid downward, enhancing fluid interaction and retention, thereby improving mass transfer efficiency and reducing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional trays are used in distillation columns, then fluid-fluid contacting occurs, but high pressure drop and fluid hold-up result in premature flooding and reduced mass transfer efficiency
Solution Approach 1:
The patent changes the physical parameters of the tray system by introducing valves with specific opening areas (0.5-2.0 times the aperture area) and using apertures of selectively reduced size (0.02-0.06 inches). These parameter changes optimize the balance between pressure drop and mass transfer efficiency, allowing the system to operate at higher capacities without premature flooding while maintaining effective fluid-fluid contact for mass transfer.
2Reliability
If conventional trays are used, then fluid contact occurs, but instability increases when operating pressures increase
Solution Approach 1:
The patent introduces floating valves that can dynamically adjust their position and opening area in response to changing operating conditions including pressure variations. This dynamic capability allows the tray system to maintain stability under varying operating pressures, as the valves automatically adapt to prevent flooding and maintain optimal fluid distribution patterns.
3Productivity
If larger apertures are used in trays, then fluid flow capacity increases, but pressure drop control and fluid distribution stability deteriorate
Solution Approach 1:
The patent segments the fluid flow path by introducing multiple small apertures (0.02-0.06 inches) distributed across the tray, rather than using fewer large openings. Each aperture is้ ๅ with a valve that independently controls local flow. This segmentation allows the system to maintain high overall flow capacity while each small aperture provides stable, controlled fluid distribution, preventing the instability that would result from larger individual openings.
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
This configuration enhances fluid-fluid contact efficiency, reduces pressure drop, and prevents flooding by maintaining stable froth height and proper fluid distribution, leading to increased capacity and consistent operation.
Implementation Method 1
A valve cover is disposed in the retaining cage. The valve cover includes a top surface having a surface area and at least one vane formed on an edge of the top surface. The at least one vane is directed outwardly and downwardly relative to the top surface.
Data Source
AI summary
The present disclosure relates to a valve tray for use in a chemical process column. The valve tray includes a plurality of apertures formed therein. A plurality of valves are maintained in a spaced relationship relative to individual apertures of the plurality of apertures. An area of the individual apertures is less than an area of individual valves of the plurality of valves.