Monolith Catalyst Carrier Heat Transfer Segmentation
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Solution Overview
Problem
Tubular reactors face limitations in heat transfer and catalyst productivity due to the need for small tube diameters and specific catalyst particle sizes to manage exothermic or endothermic reactions, leading to thermal runaway and pressure drop issues, which restrict the use of larger tubes and catalyst volumes.
Innovation Solution
A monolith catalyst carrier with a container, skirt, and seal configuration that enhances heat transfer by directing reactants and products through the catalyst, allowing for larger tube diameters and longer reactor lengths while maintaining efficient heat exchange at the tube wall, separate from the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If small tube diameters are used to ensure efficient heat transfer and avoid thermal runaway, then heat transfer efficiency is improved, but the number of tubes and reactor weight increase significantly
Solution Approach 1:
The reactor is segmented into multiple tubes, each containing a catalyst carrier with internal channels. This segmentation allows heat transfer to occur at multiple locations within each tube, effectively increasing the heat transfer surface area without increasing the number of external tubes, thus reducing reactor weight while maintaining temperature control.
Solution Approach 2:
Heat transfer is moved from a single external dimension (tube wall) to multiple internal dimensions within the catalyst carrier. The monolith structure provides internal channels that enable heat exchange throughout the catalyst volume, transforming the heat transfer problem from a surface-area limitation to a volumetric solution.
2Reliability
If small tube diameters are used to maintain cool center line temperature, then thermal runaway is avoided, but the catalyst volume per tube is reduced
Solution Approach 1:
The catalyst is segmented into a monolith structure with multiple internal channels, allowing reactants to access catalyst active sites throughout the entire volume rather than only at the outer surface. This segmentation enables full utilization of catalyst volume while maintaining thermal stability through internal heat dissipation pathways.
Solution Approach 2:
Catalyst utilization is extended from a two-dimensional surface layer to a three-dimensional volumetric structure. The monolith's internal channels distribute reactants throughout the catalyst volume, enabling complete volumetric utilization while the same volume provides enhanced heat transfer capability.
3Stress or pressure
If larger catalyst particles are used to reduce pressure drop, then pressure loss is reduced, but mass and heat transfer limitations increase
Solution Approach 1:
The catalyst is structured as a monolith with internal channels that segment the flow path into multiple parallel streams. This segmentation reduces the diffusion distance for mass and heat transfer while maintaining large particle size benefits for pressure drop, as the channels provide direct pathways through the catalyst structure.
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
Enables high productivity and heat transfer efficiency in exothermic or endothermic reactions with reduced reactor weight and cost, allowing for longer tubes and improved catalyst performance by separating heat exchange from the reaction zone.
Implementation Method 1
During operation, gas, liquid, or both gas and liquid flows through the tubes over the catalyst particles such that the desired reaction takes place
Implementation Method 2
it is necessary that there is efficient heat transfer via the tube wall to control the conditions within the reactor
Implementation Method 3
gas, liquid, or both gas and liquid flows through the tubes over the catalyst particles such that the desired reaction takes place
Implementation Method 4
for more exothermic or endothermic reactions it is necessary that there is efficient heat transfer via the tube wall
Implementation Method 5
for more exothermic or endothermic reactions it is necessary that there is efficient heat transfer via the tube wall
Data Source
Figure 1~2
Figure 3
AI summary
A monolith catalyst carrier for insertion in a tube of a tubular reactor comprising: a container for holding a monolith catalyst in use, said container having a bottom surface closing the container and a skirt extending upwardly from the bottom surface of said container to a position below the location of a seal and spaced therefrom, said skirt being positioned such that there a space between an outer surface of the monolith catalyst and the skirt; and a seal located at or near a top surface of the monolith catalyst and extending from the monolith catalyst by a distance which extends beyond an outer surface of the skirt.