Multi-tubular Reactor Temperature Control via Strategic Tube Placement
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Solution Overview
Problem
In large multi-tubular reactors, it is challenging to efficiently control the temperature of numerous reaction tubes, leading to the formation of hot spots or cold spots due to inadequate heat transfer, which affects the production efficiency of substances in exothermic or endothermic reactions.
Innovation Solution
A multi-tubular reactor design featuring a cylindrical shell with reaction tubes arranged in a triangular configuration and equipped with a disk-and-doughnut type baffle, where temperature-measuring reaction tubes are strategically placed to monitor and control temperature, reducing the angle between adjacent reaction tubes to between 0 to 15 degrees to enhance heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of reaction tubes is increased to improve production capacity, then productivity increases, but temperature control difficulty increases leading to hot spots or cold spots
Solution Approach 1:
The reactor is segmented into multiple zones with strategically placed temperature-measuring reaction tubes at specific angular positions (0-15 degrees relative to adjacent tubes). This segmentation allows monitoring of representative zones without requiring thermometers in all tubes, maintaining temperature control reliability while supporting high productivity with thousands of reaction tubes
Solution Approach 2:
The patent uses the heat transfer medium flowing in the shell as an intermediary to uniformly distribute heat across all reaction tubes. The disk-and-doughnut type baffle acts as a mediator to guide and uniformize the flow path, ensuring consistent heat transfer to numerous reaction tubes simultaneously, thus maintaining temperature control as the number of tubes increases
2Measurement precision
If thermometers are installed in all reaction tubes to monitor temperature, then temperature measurement precision improves, but device complexity increases
Solution Approach 1:
Instead of uniformly instrumenting all reaction tubes, the patent applies temperature measurement locally at specific strategic positions (reaction tubes where the angle between adjacent tubes is 0-15 degrees). This local quality approach provides sufficient temperature monitoring precision for controlling the entire reactor while avoiding the complexity of installing thermometers in every tube
Solution Approach 2:
The patent uses a small number of temperature measurements from representative reaction tubes to infer and control the temperature conditions in all other tubes. By monitoring key positions that reflect the thermal state of the entire reactor, the system achieves comprehensive temperature control without direct measurement in every tube, reducing device complexity while maintaining effective monitoring
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 effectively prevents the formation of hot spots or cold spots, allowing for precise temperature control and improved heat transfer efficiency, even with a large number of reaction tubes, reducing the need for numerous thermometers and simplifying reactor operation.
Implementation Method 1
a heat transfer medium flows in the shell and comes into contact with the reaction tubes
Implementation Method 2
The heat transfer medium flows in the shell. For example, in the exothermic reaction, the reaction-heat generated from the reaction is removed by the heat transfer medium
Implementation Method 3
a disk-and-doughnut type baffle... control the flow of the heat transfer medium
Implementation Method 4
the reaction tubes are arranged so as to be in a triangular configuration... a line through a central axis of the temperature-measuring reaction tube and a central axis of at least one adjacent reaction tube next to the temperature-measuring reaction tube forms an angle therebetween of 0 to 15 degree
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
Objects of the present invention consist in provision of a multi-tubular reactor which can appropriately control a reaction so that formation of a hot spot or a cold spot is prevented during production of a substance with an exothermic or endothermic reaction. The present invention relates to a multi-tubular reactor (1) comprising a cylindrical shell (2), a plurality of reaction tubes (10) located in the shell, and a disk-and-doughnut type baffle (5), wherein the reaction tubes (10) are arranged so as to be in a triangular configuration, one or more of the reaction tubes (10) is/are a temperature-measuring reaction tube(s) provided with a thermometer (20), and a line (BL) through a central axis of the temperature-measuring reaction tube and a central axis of the shell (2) forms an angle from 0 to 15 degree with a line (CL) through the central axis of the temperature-measuring reaction tube and a central axis of at least one adjacent reaction tube next to the temperature-measuring reaction tube, in a cross section of the reactor (1) perpendicular to the central axis of the shell (2), as well as a design and production method thereof.