Naphtha Hydrotreating Reactor Temperature Difference Control
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Solution Overview
Problem
The existing processes for hydrotreating a naphtha fraction in Fischer-Tropsch synthesis reactions require complex operations and significant time for sampling and analysis, making it difficult to ascertain the degree of impurity removal and adjust the hydrotreating temperature in real-time.
Innovation Solution
A process that estimates and measures the temperature difference between the inlet and outlet of the naphtha fraction hydrotreating reactor, using the flow rate ratio of the treated naphtha fraction, to adjust the reaction temperature and control the hydrotreating step without analyzing the treated naphtha fraction, ensuring rapid progression of impurity removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sampling and analysis operations are performed to ascertain the degree of impurity removal, then measurement precision of impurity removal is improved, but loss of time and device complexity increase
Solution Approach 1:
The patent replaces the mechanical sampling and laboratory analysis system with a thermal measurement system. By using temperature difference sensors to monitor the exothermic reaction heat in the hydrotreating reactor, the system substitutes physical sampling with non-intrusive thermal detection, enabling real-time monitoring without time loss.
Solution Approach 2:
The patent introduces temperature difference as an intermediary parameter to indirectly measure impurity removal progress. Instead of directly analyzing impurity concentrations through sampling, the system uses temperature changes caused by hydrotreating reactions as a mediator to infer the degree of impurity removal, eliminating the need for direct sampling.
2Measurement precision
If sampling and analysis operations are performed to ascertain the degree of impurity removal, then measurement precision of impurity removal is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical sampling systems and laboratory analysis equipment with simple temperature difference sensors and data processing units. The measurement system is simplified from multi-component sampling infrastructure to a single-point thermal detection system, reducing device complexity while maintaining measurement capability.
Solution Approach 2:
The patent extracts the essential measurement function from the complex sampling and analysis system. By isolating the temperature difference measurement as the critical parameter, the system removes unnecessary sampling infrastructure and analysis equipment, retaining only the essential thermal detection functionality.
3Productivity
If real-time control of hydrotreating temperature is implemented, then productivity is improved, but measurement precision requirements increase
Solution Approach 1:
The patent implements a feedback control system that continuously monitors temperature difference and adjusts hydrotreating conditions in real-time. The measured temperature difference is fed back to the control system, which automatically adjusts operating parameters to maintain optimal impurity removal, enabling rapid response without excessive measurement precision requirements.
Solution Approach 2:
The patent introduces dynamic adjustment of hydrotreating temperature based on real-time temperature difference measurements. Instead of static temperature control, the system dynamically responds to changing reaction conditions, allowing flexible adaptation to varying impurity loads and maintaining optimal performance without requiring ultra-precise measurements.
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 approach allows for rapid and appropriate control of the hydrotreating process, ensuring effective removal of impurities and production of high-quality hydrocarbon oil without the need for extensive sampling and analysis.
Implementation Method 1
the olefins and oxygen-containing compounds such as alcohols contained within the raw naphtha fraction are removed by a hydrogenation reaction
Implementation Method 2
the olefins and oxygen-containing compounds such as alcohols contained within the raw naphtha fraction are removed by a hydrogenation reaction and hydrodeoxygenation reaction respectively
Implementation Method 3
Because these reactions are highly exothermic, excessive temperature increase in the naphtha fraction hydrotreating reactor is a concern
Data Source
AI summary
A process for hydrotreating a naphtha fraction that includes a step of estimating the difference between the naphtha fraction hydrotreating reactor outlet temperature and inlet temperature, based on the reaction temperature of the Fischer-Tropsch synthesis reaction and the ratio of the flow rate of the treated naphtha fraction returned to the naphtha fraction hydrotreating step relative to the flow rate of the treated naphtha fraction discharged from the naphtha fraction hydrotreating step, a step of measuring the difference between the naphtha fraction hydrotreating reactor outlet temperature and inlet temperature, and a step of adjusting the reaction temperature of the naphtha fraction hydrotreating step so that the measured difference between the naphtha fraction hydrotreating reactor outlet temperature and inlet temperature becomes substantially equal to the estimated difference between the naphtha fraction hydrotreating reactor outlet temperature and inlet temperature.