Hotspot Detection in Tube Bundle Reactors via Cooling Liquid Temperature
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Solution Overview
Problem
Chemical reactors with strong heat tone reactions face challenges in accurately locating and monitoring hotspots due to catalyst deactivation, which requires frequent catalyst replacement, and existing temperature measurement methods are costly, prone to interference, and destructive to the reactor environment.
Innovation Solution
Measuring the temperature of the cooling liquid at multiple positions along the cooling liquid flow path to indirectly determine the hotspot position within the tubes, allowing for estimation of remaining catalyst operation time without direct temperature measurement inside the tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct temperature measurement is performed inside the tubes using temperature tubes, then hotspot position can be measured, but the measurement system becomes expensive and fragile due to high temperature and chemical exposure
Solution Approach 1:
The patent introduces cooling liquid as an intermediary medium to transfer thermal information from the tubes to the measurement system. Instead of placing temperature sensors directly inside the tubes, the cooling liquid flows through channels surrounding the tubes and carries thermal data, which is then measured by external temperature measuring devices. This mediator approach eliminates the need for fragile high-temperature resistant sensors while maintaining measurement capability.
Solution Approach 2:
The patent replaces direct mechanical temperature sensing inside tubes with a thermal field-based measurement system. By measuring temperature changes in the cooling liquid at different positions, the system indirectly determines hotspot position through thermal field analysis, substituting complex mechanical sensor systems with a simpler fluid-based thermal measurement approach.
2Measurement precision
If temperature tubes are installed inside the tubes to measure hotspot position, then measurement is possible, but the tubes are obstructed and catalyst filling is affected
Solution Approach 1:
The patent extracts the temperature measurement function from the tube interior and relocates it to the external cooling liquid system. By removing the temperature tube from inside the reaction tubes, the catalyst filling process is no longer obstructed, and the tubes maintain their original functionality for both reaction and measurement purposes.
Solution Approach 2:
The cooling liquid serves as an intermediary that transmits thermal information without requiring physical intrusion into the tubes. Temperature measuring devices are positioned in the cooling liquid flow path, allowing measurement through the cooling liquid rather than direct contact with the tubes, thus avoiding obstruction of catalyst filling.
3Reliability
If catalyst is replaced frequently to maintain hotspot position, then reaction efficiency is maintained, but production stops increase and productivity decreases
Solution Approach 1:
The patent implements a feedback system that continuously monitors cooling liquid temperature at multiple positions to track hotspot movement in real-time. This feedback information allows operators to predict when catalyst deactivation will affect performance and plan replacements during scheduled downtime, rather than replacing catalyst frequently based on fixed schedules, thereby maintaining continuous production.
Solution Approach 2:
By monitoring temperature profiles over time, the system enables preliminary detection of catalyst deactivation trends before they significantly impact reaction efficiency. This allows for planned maintenance scheduling that minimizes production interruptions, rather than reactive catalyst replacement that causes frequent stoppages.
4Loss of time
If multiple temperature measuring devices are used to accurately track hotspot movement, then remaining operation time can be predicted, but measurement system complexity increases
Solution Approach 1:
The cooling liquid serves multiple functions simultaneously: it cools the tubes during operation, acts as a heat transfer medium for temperature measurement, and provides a medium for tracking hotspot position over time. By using the same cooling liquid system for both cooling and measurement purposes, the patent avoids adding separate measurement infrastructure that would increase system complexity.
Solution Approach 2:
The cooling liquid acts as a universal intermediary that enables both cooling operation and temperature monitoring through the same system. Temperature measuring devices positioned in the cooling liquid flow path can track hotspot movement over time, enabling prediction of remaining operation time without requiring separate specialized measurement systems.
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 method allows for precise localization of hotspots and prediction of catalyst deactivation, reducing the need for frequent catalyst replacement and minimizing costs by using cost-effective temperature measuring devices, while avoiding the drawbacks of direct temperature measurement techniques.
Implementation Method 1
measuring the temperature of the cooling liquid at at least two spaced positions of the cooling liquid flow path
Data Source
AI summary
Chemical reactor comprising an educt space with inlet means for feeding at least one educt stream into said space: a product space with outlet means for removing at least one product stream from said space: a plurality of parallel tubes extending from the educt space to the product space in an axial direction, forming a tube bundle, wherein the tubes comprise at least one heterogeneous catalyst: a cooling liquid space surrounding at least a section of the tube bundle, wherein said space has an inlet and an outlet spaced from the inlet at least in the axial direction, and wherein the cooling liquid space defines a cooling liquid flow path between inlet and outlet: n cooling liquid temperature measuring devices MD(i), i=1 . . . n, n>2, inside the cooling liquid space, wherein MD(i+1), is located upstream of MD(i) in the cooling liquid flow path.