Reactor Inlet Vapor Velocity Equalization via Ring Plates
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Solution Overview
Problem
In reactor systems, uneven distribution of vapor reactants occurs due to higher velocity concentrations near bends in the piping, leading to asymmetric flow and underutilization of catalyst, which reduces productivity and causes hot spots, and existing solutions like baffles and inert support beds result in back pressure and velocity loss.
Innovation Solution
A sequence of ring-like obstructions within the reactor inlet, designed to create a controlled pressure drop, is used to balance vapor flow velocities by strategically positioning flange and ring plates to minimize resistance and ensure even distribution across the reactor interior without enlarging the reactor size or impairing productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If baffles and vanes are used to create back pressure on the inlet stream, then the distribution of reactants across the reactor is improved, but velocity loss and productivity are reduced
Solution Approach 1:
The inlet stream is divided into multiple segments by providing a plurality of nozzles arranged circumferentially around the reactor inlet axis. Each nozzle receives a portion of the inlet stream and directs it into the reactor, creating multiple discrete flow paths that collectively achieve uniform distribution without requiring back pressure from baffles or vanes.
Solution Approach 2:
The nozzles act as intermediary elements between the inlet conduit and the reactor interior. Each nozzle serves as a mediator that takes the asymmetrically distributed inlet stream and transforms it into uniformly distributed radial flows within the reactor, eliminating the need for back pressure creating devices.
2Stability of the object's composition
If an inert support bed with thick layer of inert material is provided to create tortuous paths, then mixing and back pressure are created to balance flow, but available volume for catalyst is reduced
Solution Approach 1:
Instead of using a continuous thick layer of inert support material, the invention segments the flow control function into multiple discrete nozzles. This eliminates the need for large volumes of inert material while achieving flow balance through the geometric arrangement and flow splitting capability of the nozzles.
Solution Approach 2:
The flow balancing function is extracted from the inert support bed and implemented through the nozzle system. This removes the requirement for thick inert material layers, thereby maximizing the volume available for catalyst while maintaining flow balance through the nozzle geometry and arrangement.
3Speed
If vapor follows a bend in the piping leading to the reactor, then higher velocity concentrations occur away from the center, but asymmetric distribution causes hot spots and underutilization of catalyst
Solution Approach 1:
The inlet stream is segmented into multiple discrete flows through the circumferential nozzle array. Each nozzle captures a portion of the asymmetrically distributed vapor and redirects it radially into the reactor, transforming the non-uniform velocity profile into uniform radial flows that eliminate hot spots and catalyst underutilization.
Solution Approach 2:
Instead of attempting to straighten or uniformize the asymmetric inlet stream before it enters the reactor, the invention inverts the approach by using the asymmetric flow to advantage in the nozzle design. The nozzles are positioned and oriented to capture and redirect the asymmetric flows into uniform radial patterns, turning the problem of asymmetric inlet distribution into a solution.
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 solution achieves a balanced distribution of vapor flow, optimizing catalyst usage and reactor productivity by reducing velocity asymmetry, thereby extending catalyst life and enhancing overall reactor performance.
Implementation Method 1
The size of the first obstruction and the size of the circular opening create a pressure drop of no more than 0.25 pounds for the vapor passing through the generally cylindrical inlet
Data Source
AI summary
The invention relates to distributing reactants more evenly across the interior space of a reactor vessel utilizing a distributor at the inlet end that initially directs the flow of reactants through a flange plate and a series of ring plates. The ring plates are physical spaced such that vapor along the wall of the inlet is mildly obstructed by the flange plate and the ring plates cause the vapor to alter course temper down any diverse velocities that may create hot spots within the catalyst bed.