Radial Chemical Reactor Walls with Slits for Fine Catalyst Retention
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Solution Overview
Problem
Existing catalytic chemical reactors with radial or axial-radial flow catalyst beds face challenges in retaining fine catalyst particles without obstructing the gas-permeable walls or weakening them due to the need for smaller perforations.
Innovation Solution
The reactor design incorporates cylindrical walls with slits that have a specific ratio of transverse dimension to catalyst particle size, ensuring effective retention of fine catalyst particles while minimizing obstruction and maintaining wall integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of the holes or slits of the perforated walls is reduced to retain fine catalyst particles, then the catalyst retention is improved, but the risk of obstruction of the perforated walls by catalyst dust increases and the walls are weakened
Solution Approach 1:
The invention changes the geometric parameters of the wall openings from circular holes to slits with a specific aspect ratio (length to width ratio between 2 and 10). This parameter change allows the openings to be sized appropriately for retaining fine catalyst particles while maintaining sufficient structural integrity of the wall and reducing obstruction risk compared to traditional circular perforations.
2Reliability
If a metal net of fine mesh is used to line the walls to retain fine catalyst, then the catalyst retention is improved, but the net is easily exposed to damage and failure under severe temperature, pressure, and chemical attack conditions
Solution Approach 1:
The invention extracts and eliminates the vulnerable metal net lining from the reactor design. Instead of using a fine mesh net that is susceptible to damage under severe operating conditions, the invention achieves catalyst retention directly through the optimized slit geometry in the perforated walls themselves, removing the weak intermediate component.
3Productivity
If catalyst particles with smaller size are used to improve contact with reagents and yield, then the reaction efficiency is improved, but the obstruction of the perforated walls increases
Solution Approach 1:
The invention optimizes the geometric parameters of the wall openings (changing from circular to slit shape with specific aspect ratios) to create an opening geometry that is particularly effective at preventing catalyst particle passage while maintaining gas flow. This allows the use of finer catalyst particles for improved reaction efficiency without the obstruction problems that would normally accompany fine particle usage.
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 design allows for the use of catalysts with a particularly fine particle size, achieving a surprisingly small degree of obstruction and maintaining the reliability and function of the reactor's perforated walls.
Implementation Method 1
said walls have the task of retaining the particles of catalyst and of distributing a gaseous flow containing the reagents and, respectively, collecting a gaseous flow containing the reaction products
Data Source
AI summary
Reactor for catalytic chemical reactions comprising a catalyst bed with an annular-cylindrical form crossed by a radial flow or mixed axial-radial flow, wherein the bed is delimited by cylindrical walls made gas-permeable by means of slits and the catalyst bed is formed by particles of catalyst with a nominal minimum size such that: the ratio between a transverse dimension of the slits and the nominal minimum size of the particles of catalyst is smaller than or equal to 0.6; the catalyst bed contains no more than 3% by weight of particles with an actual size smaller than said nominal size.