Spherical Reactor Inlet Distributor for Uniform Vapor Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reactor inlet designs often result in uneven distribution of vaporous reactants due to higher velocities around bends, leading to hot spots and underutilization of catalyst, which reduces productivity and causes premature catalyst aging.
Innovation Solution
A reactor inlet system with an equalizer section that minimizes obstruction and balances vapor velocities using flange and ring plates, and a distributor section with radial nozzles to ensure uniform vapor distribution across the reactor vessel, reducing pressure drop and enhancing catalyst utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If baffles and vanes are used to create back pressure on the inlet stream, then reactant distribution across the reactor is improved, but pressure drop increases significantly
Solution Approach 1:
The inlet distributor is segmented into multiple radial nozzles arranged circumferentially, each delivering reactants to different radial zones of the catalyst bed. This segmentation allows uniform distribution without requiring high back pressure, as each nozzle independently controls flow to its designated zone.
Solution Approach 2:
Different radial nozzles are designed with different flow characteristics tailored to local requirements - outer nozzles compensate for lower velocity regions while inner nozzles handle higher velocity regions. This local customization achieves uniform distribution without uniform high pressure drop across the entire inlet.
2Manufacturing precision
If an inert support bed with thick layer is provided to create tortuous paths, then mixing and back pressure are improved, but reactor volume increases significantly
Solution Approach 1:
The inert support bed is reduced to a thin layer that performs preliminary distribution function, while the main distribution task is handled by the specially designed radial nozzle system at the inlet. This preliminary action approach eliminates the need for a thick support bed, reducing reactor volume while maintaining distribution quality.
Solution Approach 2:
The radial nozzle system acts as an intermediary device between the inlet stream and the catalyst bed, performing the distribution function that would otherwise require a thick inert support bed. This intermediary mechanism achieves uniform distribution with minimal support bed thickness.
3Productivity
If higher velocities are allowed to follow the outside of the bend, then flow rate is maintained, but reactant concentration becomes uneven across the reactor
Solution Approach 1:
The radial nozzle system provides locally optimized flow distribution - outer nozzles deliver reactants to regions that would otherwise receive excess flow from bend-induced high velocities, while inner nozzles adjust to regions that would receive less flow. This local quality adjustment maintains overall flow rate while achieving uniform distribution.
Solution Approach 2:
The radial nozzle arrangement and flow characteristics are deliberately asymmetric to compensate for the asymmetric velocity profile created by the bend. The nozzle design accounts for the non-uniform velocity distribution, creating a corrected asymmetric pattern that results in uniform overall distribution while maintaining high flow rates.
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 system achieves a balanced vapor distribution across the reactor, optimizing catalyst usage, increasing productivity, and extending catalyst run time while maintaining low pressure drop.
Implementation Method 1
the equalizer section of the reactor inlet system dampens asymmetrically distributed velocities of vapor entering the reactor inlet to provide the distributor section with a generally symmetrically balanced velocity profile
Implementation Method 2
the distributor section distributes the flow of vapor outwardly and downwardly from the outlet end of the inlet system such that vapor flow is generally uniform across the reactor vessel
Data Source
AI summary
The invention relates to equalizing and distributing reactants more evenly across the interior space of a reactor vessel utilizing a combination equalizer and distributor at the inlet end that initially impedes with uneven flow rates of vapor and then directs the flow of vapor through a series of circumferential nozzles. The nozzles are physical spaced such that the first nozzle provides the reactants into the vessel to spread radially and broadly outwardly into the vessel and each successive circumferential nozzle to deliver reactants in a less broadly distribution or dispersion where the interior space is filled with reactants without broadly diverse velocities that may create hot spots within the catalyst bed.