Vertical Thermosiphon Cooling for CO2 Methanation Reactors
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Solution Overview
Problem
Current cooling systems for methanation reactors, particularly those using phase change cooling, face issues such as stratification between liquid and vapor phases, leading to inefficient cooling and premature catalyst deactivation, and require additional pumps increasing costs without ensuring optimal operation.
Innovation Solution
A cooling device utilizing vertically oriented tubes with a thermosiphon mechanism for continuous water and steam circulation, regulated by a control loop that adjusts pressure based on actual bed temperature to maintain optimal conversion efficiency, preventing stratification and reducing construction and operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coils or bundles are used for phase change cooling, then cooling effect is improved, but stratification between liquid and vapor phases occurs leading to inefficient cooling
Solution Approach 1:
The patent inverts the conventional horizontal or slightly inclined coil configuration by using vertically oriented tubes. This inversion eliminates stratification between liquid and vapor phases, ensuring efficient phase change cooling throughout the entire reactor volume without dead zones.
Solution Approach 2:
The patent transitions from horizontal/2D coil arrangements to vertical/3D tube configurations. This dimensional change allows gravity to naturally separate phases vertically while maintaining uniform cooling distribution throughout the reactor, preventing stratification issues.
2Reliability
If circulation pumps are inserted in the cooling device, then cooling system reliability is improved, but investment and operating costs increase
Solution Approach 1:
The patent employs natural circulation driven by density differences between liquid and vapor phases. The vertical tube configuration allows the cooling system to self-regulate without external pumps, eliminating mechanical complexity while maintaining reliable operation through buoyancy-driven flow.
Solution Approach 2:
The patent replaces the mechanical circulation pump system with a thermally-driven natural circulation system. The phase change and density variations automatically drive the cooling fluid circulation, substituting mechanical complexity with thermal physics-based operation.
3Temperature
If tubular exchanger configuration is used, then temperature control is improved, but construction cost of shell increases sharply at high pressures
Solution Approach 1:
The patent merges the cooling function directly into the reactor structure by making the reactor walls themselves the heat exchange surface. This eliminates the need for separate high-pressure shells and internal tubular exchangers, reducing construction complexity and cost while maintaining effective temperature control.
Solution Approach 2:
The patent makes the reactor walls multi-functional by combining structural containment and heat exchange functions. The same vertical tubes that form the reactor boundary also serve as the cooling heat exchange surface, eliminating redundant components.
4Device complexity
If fixed bed reactors without internal cooling system are used, then design simplicity is improved, but temperature increase leads to drop in conversion efficiency
Solution Approach 1:
The patent combines the cooling function with the reactor structure itself rather than adding separate cooling systems. The vertical tube walls perform both structural and heat exchange functions, maintaining design simplicity while enabling effective temperature control to preserve conversion efficiency.
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 ensures efficient and uniform temperature control within the reactor, maintaining catalyst activity and optimizing conversion rates while avoiding the need for auxiliary pumps, thus reducing costs and preventing toxic compound formation.
Implementation Method 1
A cooling device utilizing vertically oriented tubes with a thermosiphon mechanism for continuous water and steam circulation
Implementation Method 2
These systems are based on the use of coils into which the cooling water is introduced and the phase change takes place in the coils
Data Source
Figure 1
Figure 2~3
AI summary
The cooling device (10) for a carbon dioxide methanation catalytic reactor (105) comprises: - at least one cooling tube (110) passing through the reactor comprising: - an inlet (115) and - an outlet (120) positioned at an altitude higher than the inlet, - a water tank (125) supplying the tube by gravity, comprising: - a water outlet (130), connected to the inlet of the tube; - a water and steam inlet (135) connected to the outlet of the tube; - a steam outlet (140) and - a water supply inlet (145), - a means (150) for measuring the temperature in the catalytic reactor and - a means (155) for controlling a water level in the water tank configured to supply the water tank with water in order to maintain a predefined water level in the tank.