Fluid Distributor Hoods for Up-flow Reactor Uniformity
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Solution Overview
Problem
In two-phase, co-current up-flow reactors, there is a need for improved distribution of fluid streams before they enter the catalyst bed and effective separation of streams after ascending through the catalyst bed to prevent carry-over and maintain reactor performance, particularly to avoid cavitation issues with pumps.
Innovation Solution
A fluid distributor system comprising a supply pipe with distribution arms and elongated hoods to ensure uniform fluid distribution across the reactor cross-section, along with a fluid distributor plate and a catalyst hold-down baffle with an annular flow path to facilitate separation of fluid streams in the upper region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional distribution methods are used, then the structure is simple, but the fluid distribution uniformity is poor
Solution Approach 1:
The distributor is divided into multiple functional segments: supply pipe, distribution arms with holes, and elongated hoods with multiple openings. Each segment performs a specific function in the fluid distribution process, allowing precise control over flow patterns and achieving uniform distribution across the reactor cross-section.
Solution Approach 2:
The elongated hoods extend perpendicular to the distribution arms, adding a third dimension to the fluid distribution geometry. This dimensional extension allows the fluid to be redirected and distributed over a larger area, improving uniformity while managing the complexity through structured spatial arrangement.
2Reliability
If impermeable disk with annular space is used for separation, then the structure is simple, but the separation effectiveness is insufficient
Solution Approach 1:
The separation structure is segmented into multiple functional zones: the impermeable disk with annular space for initial separation, the calming zone above the disk for velocity reduction, and the permeable shroud around the intake pipe for final phase separation. Each zone contributes to the overall separation effectiveness.
Solution Approach 2:
The calming zone acts as an intermediary region between the high-velocity mixed phase flow from the catalyst bed and the intake pipe. This intermediate zone allows the fluid streams to decelerate and separate before entering the intake pipe, improving separation effectiveness without requiring direct modification of the intake structure.
3Productivity
If fluid streams are not well distributed, then the reactor structure is simple, but the reactor performance is reduced
Solution Approach 1:
The distribution system provides different flow characteristics at different locations: the supply pipe delivers fluid to the distribution arms, which then distribute it through holes along the arm length. The elongated hoods further modify the local flow patterns by redirecting fluid through their multiple openings, ensuring each region of the reactor receives appropriately distributed fluid for optimal performance.
4Reliability
If carry-over gas enters the liquid stream, then the pump operation is simple, but cavitation damage occurs
Solution Approach 1:
The separation structure performs preliminary separation of gas and liquid phases before the fluid enters the pump intake. The impermeable disk creates an annular flow path that promotes phase separation, and the calming zone above the disk allows gas to rise and separate from the liquid stream, preventing carry-over gas from reaching the pump and causing cavitation.
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
Enhances the distribution and separation of fluid streams, leading to improved reactor performance and reduced risk of cavitation damage to pumps, as demonstrated by computational fluid dynamics studies.
Implementation Method 1
each of the fluid distribution arms having a plurality of holes for discharging the fluid when the fluid is within the fluid distribution arms and is under pressure
Implementation Method 2
an elongated hood overlaying and spaced from and at least partially surrounding each of the fluid distribution arms and constructed to redirect the fluid when discharged from the plurality of holes in the fluid distribution arms
Implementation Method 3
A fixed bed of catalyst particles may be provided in the co-current flow path of the fluid streams to cause the intended catalytic reaction between the fluid streams
Implementation Method 4
the two fluid streams have to be separated to minimize the carry-over of one fluid stream into the other that may adversely affect the performance of the reactor. This carry-over is particularly problematic when the fluid streams are a liquid stream and a gas or vapor stream
Data Source
AI summary
A fluid distributor is provided for distributing a fluid in an up-flow reactor. The fluid distributor includes a supply pipe and a plurality of fluid distribution arms that extend from the supply pipe. Each of the fluid distribution arms has a plurality of holes for discharging the fluid. An elongated hood is spaced from and at least partially surrounds each of the fluid distribution arms to redirect the fluid when discharged from the plurality of holes in the fluid distribution arms. Each hood has a plurality of holes for allowing the passage of the fluid through the hood. Each of the hoods is formed from a plurality of hood segments that positioned end to end along a length of the fluid distribution arm and have deflectors to impede the fluid from flowing between adjacent ones of the hood segments.