Structured Packing for Reactor Wall Heat Transfer
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Solution Overview
Problem
Existing reactor designs face challenges in achieving high heat transfer coefficients near the reactor wall while minimizing pressure drop, especially in large-diameter reactors, where friction and boundary layers limit heat transfer efficiency.
Innovation Solution
The structured packing is created by folding a sheet into alternating columns with oblique vanes that impinge and return fluid from the reactor wall, connected by webs, increasing the geometric surface area and heat transfer without significantly increasing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large-diameter reactors are used to achieve economies of scale, then reactor capacity increases, but heat transfer coefficient near the reactor wall decreases due to lower surface area to volume ratio and boundary layer effects
Solution Approach 1:
The reactor internal space is segmented into multiple flow channels by packing elements, creating numerous pathways for fluid flow. This segmentation increases the effective heat transfer surface area distributed throughout the reactor volume, allowing large-diameter reactors to maintain high heat transfer coefficients by providing many small-scale heat transfer interfaces rather than relying on a single large wall surface.
Solution Approach 2:
The invention transitions from relying solely on radial heat transfer through the reactor wall to incorporating axial and circumferential heat transfer pathways through the packing structure. The packing elements create three-dimensional heat transfer networks that distribute thermal energy more effectively throughout the reactor volume, compensating for the reduced radial surface area to volume ratio in large-diameter reactors.
2Temperature
If structured packing with alternating columns and oblique vanes is used to enhance heat transfer near the reactor wall, then heat transfer coefficient increases, but pressure drop may increase
Solution Approach 1:
The packing structure implements local quality by concentrating heat transfer enhancement features (oblique vanes and wall-impinging flow paths) specifically in regions where heat transfer is most needed, such as near the reactor wall and in high-temperature zones. The alternating column design creates localized turbulence and flow impingement at strategic locations without requiring uniform complexity throughout the entire reactor, thereby limiting pressure drop while maximizing heat transfer coefficients where they have the greatest impact.
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 enhances heat transfer coefficients near the reactor wall, improving reaction rates and operational safety in catalytic reactors and heat exchangers by increasing the available surface area for heat exchange without excessive pressure drop.
Implementation Method 1
folding the sheet into a structure comprising alternating columns containing vanes disposed in opposite oblique orientation to the reactor axis for causing fluid to alternately impinge on and return from a wall of the reactor
Implementation Method 2
Higher surface area in catalytic reactors provides greater opportunity for acceleration of reactions by providing more sites for catalyst to be effectively deployed. In particular, high geometric surface area near the wall of catalytic reactors increases the available heat for conducting exothermic reactions and the heat sink for endothermic reactions
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
A structured packing for a reactor is formed from a metal sheet to promote heat and mass transfer near the wall of the reactor. The structured packing causes lateral flow of fluids flowing through the packing such that jet impingement of at least one reactor wall is promoted. The packing may be used in a cylindrical, annular or plate-type reactor, e.g., a catalytic reactor, or a heat exchanger.