Hydrogenation Slurry Bed Reactor Temperature Control Under Runaway Risk
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Solution Overview
Problem
The hydrogenation slurry bed reactor is prone to overtemperature and overpressure issues due to exothermic reactions, leading to potential reactor explosions and economic losses, with existing safety measures like cold wall reactors being costly and risky to maintain.
Innovation Solution
A temperature-controlling measure is implemented with three control points, where cold hydrogen or oil is injected automatically and pressure relief valves are activated to manage temperature and pressure, ensuring safe operation by automatically opening relief valves when set conditions are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cold wall reactor with inner lining is adopted to prevent overtemperature and overpressure, then the reactor wall temperature is reduced and common steel can be used, but the service life of the lining is short and it requires frequent replacement
Solution Approach 1:
The invention removes the inner lining from the reactor, eliminating the component that requires frequent replacement. Instead of protecting the wall with a lining, the system uses external cooling measures and automated temperature control to manage heat without direct contact between the reaction mixture and the reactor wall
Solution Approach 2:
The invention implements automated temperature monitoring and control systems that continuously measure reactor temperature and automatically inject cold hydrogen or oil when temperature thresholds are reached, creating a feedback loop that prevents overtemperature without requiring a protective lining
2Device complexity
If the inner lining is removed from the reactor to simplify manufacturing and construction, then the device complexity is reduced, but the reactor becomes more susceptible to overtemperature and overpressure
Solution Approach 1:
The invention enables the reactor to self-regulate temperature through automated control systems that monitor temperature and automatically inject cooling agents (cold hydrogen or oil) when thresholds are reached, allowing the system to protect itself without complex structural modifications
Solution Approach 2:
The invention changes the control approach from structural protection (lining) to operational control (automated temperature and pressure monitoring with automatic injection systems), managing thermal conditions through dynamic parameter adjustment rather than static structural design
3Reliability
If automated temperature control with multiple control points is implemented, then the safety and reliability are improved, but the device complexity increases
Solution Approach 1:
The invention divides temperature control into distinct control points (first control point for cold hydrogen injection, second control point for cold oil injection, third control point for pressure relief valve opening), creating a segmented, stepwise response to temperature increases that simplifies the control logic at each stage
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 solution effectively reduces operational risks, improves safety, and maintains stable reactor conditions, preventing overtemperature and overpressure, thus enhancing the reliability and efficiency of the hydrogenation process.
Implementation Method 1
the cold hydrogen is injected automatically when the reaction system reaches the control point 1; the cold oil is injected automatically when the system reaches the control point 2
Implementation Method 2
each pressure relief point is opened automatically when the system reaches the control point 3; at least one pressure relief valve is set at each pressure relief point
Data Source
AI summary
A temperature-controlling measure for a hydrogenation slurry bed reactor has three control points that are set from low to high: cold hydrogen is injected automatically when the system reaches control point 1; cold oil in injected automatically when the system reaches control point 2; each pressure relief is opened automatically when the system reaches control point 3. The pressure relief point is set before and/or after the circulation pump of the reactor if internal circulation is set in the reactor; the pressure relief point is set at the reactor bottom if the internal circulation is not set; at least one pressure relief valve is set at each pressure relief point.