Distribution Tray Venturi Insert Fluid Flow
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Solution Overview
Problem
Existing distribution trays in chemical processing and petroleum refining often experience uneven fluid distribution, leading to inefficient wetting of catalyst beds, hotspots, and reduced catalyst life, especially during non-ideal conditions such as start-up or maintenance, and require simpler manufacturing processes for consistent fluid flow.
Innovation Solution
A distribution tray design featuring a compartment with a venturi-shaped insert that constricts and expands fluid passage, minimizing tray unlevelness effects and pressure drop, while enhancing gas-liquid mixing and fluid flow, using a compartment with a circular periphery and strategically placed openings to increase operating range and velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional distributors are used, then the structure is simple, but uneven fluid distribution occurs leading to inefficient catalyst bed wetting
Solution Approach 1:
The distributor is divided into multiple compartments (e.g., three compartments) that independently distribute fluid to different sections of the catalyst bed. Each compartment has its own set of openings and can be independently optimized, ensuring uniform fluid distribution across the entire bed while maintaining manageable structural complexity through modular design
Solution Approach 2:
Different regions of the distributor are designed with different properties - each compartment has specific opening sizes, shapes, and distributions tailored to local requirements. The openings within each compartment can vary in size and arrangement to address specific wetting needs in different catalyst bed zones, achieving local optimization for uniform distribution
2Adaptability or versatility
If distributors are designed for ideal conditions, then structure is straightforward, but non-ideal conditions like start-up cause uneven wetting and hotspots
Solution Approach 1:
The distributor design incorporates dynamic adaptability through multiple compartments with varying opening characteristics that respond differently to changing flow conditions. During start-up or non-ideal operations, the distributed compartment structure ensures that fluid is delivered uniformly across all catalyst bed sections regardless of overall flow rate variations, preventing hotspots and maintaining consistent wetting
Solution Approach 2:
The distributor is pre-configured with multiple compartments and strategically placed openings to anticipate and handle non-ideal operating conditions before they cause problems. The design inherently provides backup distribution pathways that activate when flow conditions deteriorate, ensuring continuous uniform wetting even during start-up or maintenance scenarios
3Productivity
If tray openings are enlarged to increase flow, then fluid distribution improves, but pressure drop increases
Solution Approach 1:
The total flow requirement is divided and distributed across multiple compartments, each with its own set of openings. This segmentation allows the system to achieve high total productivity through cumulative flow from multiple smaller openings while maintaining lower pressure drop in each individual compartment, as the pressure loss scales more favorably with multiple parallel pathways than with a single large opening
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 design ensures consistent and efficient fluid distribution, minimizing hotspots and extending catalyst life by creating a high-driving force for liquid flow and recovering pressure drop, while simplifying manufacturing and improving gas-liquid mixing and contact.
Implementation Method 1
The insert can form a venturi-shape throat within the compartment, such as a tube. As such, the throat can create a high-driving force for liquid flow through the distribution tray.
Implementation Method 2
Additionally, the pressure drop across the tray may be minimized as some of the pressure drop can be recovered within the venturi insert.
Implementation Method 3
Moreover, the gas-liquid mixing is typically enhanced by passing the fluid through a constriction or convergence and then out through a divergent cone in the throat of the venturi-shape insert.
Data Source
AI summary
One exemplary embodiment may be a distribution tray for a vessel. Generally, the distribution tray includes a member, a compartment, and an insert. The member can form a first side and a second side. Typically, the first side is adapted to receive a liquid thereon. Additionally, the member can form a plurality of openings. Usually, the compartment extends through the member with a first portion protruding from the first side and a second portion protruding from the second side, and is adapted to permit the passage of a fluid there-through. The insert may be positioned within the compartment to constrict and then expand the passage of the fluid there-through.