Thermal Process Retort Segmentation for Weight Reduction
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Solution Overview
Problem
Current thermal process systems for applications like methane pyrolysis in resource-limited environments, such as spacecraft, face challenges with high power consumption and weight due to the need for large and heavy equipment to maintain high temperature and pressure conditions, and require complex sealing structures that are not efficient at high temperatures.
Innovation Solution
The system separates the inner gaseous boundary from the outer pressure boundary, using an inner retort assembly within an outer vessel housing to maintain low mechanical loads and reduce power consumption, allowing for the use of lightweight, thermally stable materials and eliminating the need for low-temperature capable sealing structures by relying on concentration gradients for gas containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gaseous containment and pressure containment are provided using the same sealing structure, then the system can maintain high temperature and pressure conditions, but the system requires large and heavy equipment with complex sealing structures that consume high power
Solution Approach 1:
The patent divides the containment system into two separate boundaries: an inner gaseous boundary (retort assembly) and an outer pressure boundary (vessel housing). This segmentation allows each boundary to be optimized for its specific function, eliminating the need for a single complex sealing structure that must handle both gaseous and pressure containment simultaneously.
Solution Approach 2:
The patent extracts the pressure containment function from the gaseous containment function by placing the retort assembly inside a pressure boundary. This extraction allows the inner retort assembly to focus solely on gaseous containment while the outer vessel housing handles pressure containment, reducing the overall system weight and complexity.
2Reliability
If a single sealing structure is used for both gaseous and pressure containment, then the system can maintain containment, but the sealing structure becomes complex and requires low-temperature capable materials that are not suitable for high-temperature operations
Solution Approach 1:
The patent segments the sealing requirements into two separate systems: the inner retort assembly uses simple contact seals suitable for high-temperature gaseous containment, while the outer vessel housing provides pressure containment with its own sealing structures. This segmentation eliminates the need for a single complex sealing structure that must accommodate both gaseous and pressure containment requirements.
Solution Approach 2:
The patent applies different sealing qualities to different parts of the system. The inner retort assembly uses contact seals with high-temperature capability for gaseous containment, while the outer vessel housing uses appropriate sealing structures for pressure containment. Each sealing structure is locally optimized for its specific function and temperature conditions.
3Stress or pressure
If pressure differential across the retort assembly is high, then the system can maintain pressure conditions, but the retort assembly experiences high mechanical loads requiring heavy structural materials
Solution Approach 1:
The patent extracts the pressure maintenance function from the retort assembly by introducing an outer vessel housing that provides the pressure boundary. This allows the retort assembly to experience minimal pressure differential and focus on gaseous containment, while the vessel housing bears the mechanical loads of pressure maintenance.
Solution Approach 2:
The patent segments the pressure bearing function into a separate outer vessel housing, allowing the inner retort assembly to be constructed from lightweight materials optimized for thermal stability and chemical compatibility rather than mechanical strength.
4Reliability
If additional sealing structures are used for hermetic sealing, then the system can prevent gas leakage, but the system weight and volume increase and power consumption increases for maintaining temperature
Solution Approach 1:
The patent extracts the hermetic sealing requirement from the high-temperature retort assembly by placing it inside a pressure boundary that provides the hermetic seal. This allows the retort assembly to use simple contact seals without heavy hermetic sealing structures, reducing system weight while maintaining gas containment effectiveness.
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 configuration reduces weight, volume, and power consumption while increasing reliability by enabling high-temperature operations with reduced mechanical loads and simplified sealing, allowing for efficient hydrogen gas generation from methane pyrolysis.
Implementation Method 1
The heating assembly includes one or more heating elements and is configured to heat the retort chamber
Implementation Method 2
The vessel housing is positioned around the retort chamber and the one or more heating elements and configured to maintain a pressure within the retort chamber
Implementation Method 3
flow into or out of retort assembly may be subject to relatively low mass transfer rates driven primarily by concentration gradients of the gases within the retort assembly and other gases outside the retort assembly (causing diffusive flow)
Implementation Method 4
The retort chamber and the retort lid may be sealed against each other using a contact seal formed by surfaces of the retort chamber and lid
Data Source
AI summary
A thermal process system includes a retort assembly, a heating assembly, and a vessel housing. The retort assembly includes a retort chamber and is configured to substantially form a containment boundary to contain one or more gases in the retort chamber during a thermal process. The heating assembly includes one or more heating elements and is configured to heat the retort chamber. The vessel housing is positioned around the retort chamber and the one or more heating elements and configured to form a pressure boundary to maintain a pressure within the retort chamber and reduce a pressure across the retort chamber.