Palladium Tube Hydrogen Separator with Coaxial Support Gap
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Solution Overview
Problem
Existing hydrogen purification systems using palladium or palladium alloys face issues such as high cost, susceptibility to fatigue and vibration damage, contaminant back-up, and reduced efficiency due to the need for high temperatures and pressure, which limits the use of palladium and affects gas flow rates.
Innovation Solution
A hydrogen purification system with hydrogen permeable tubes made of palladium or palladium alloys, supported by coaxially aligned tubes with a gap space for gas flow, allowing efficient hydrogen separation while minimizing palladium usage and reducing mechanical stress through controlled expansion and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional separation methods (ammoniacal sulfur, hot potassium carbonate, amine-based systems) are used to remove acid gases from natural gas, then acid gas removal is achieved, but the system suffers from high energy consumption, high operational costs, and environmental concerns
Solution Approach 1:
The patent changes the chemical parameters of the absorption system by using aqueous zinc oxide solution instead of traditional amine-based systems. This parameter change enables acid gas removal at lower temperatures and pressures, significantly reducing the energy consumption associated with solvent regeneration and operation while maintaining high removal efficiency
Solution Approach 2:
The patent utilizes the phase transition properties of zinc oxide, which can reversibly change its absorption capacity based on temperature and pressure conditions. The zinc oxide solution absorbs acid gases under specific conditions and can be regenerated by changing these conditions, enabling energy-efficient cyclic operation without requiring high-energy thermal processes
2Reliability
If traditional separation methods are used, then acid gas removal is achieved, but operational costs and environmental impact increase
Solution Approach 1:
The patent employs an aqueous zinc oxide solution that can be continuously regenerated and reused, eliminating the need for frequent disposal and replacement of absorption media. This approach reduces waste generation and environmental impact compared to traditional methods that require disposal of spent solvents
Solution Approach 2:
The zinc oxide-based system creates a more environmentally benign operational environment compared to amine-based systems. The aqueous zinc oxide solution does not produce the same harmful emissions and byproducts as traditional amine systems, reducing environmental harm while maintaining effective acid gas removal
3Reliability
If conventional separation systems are used, then gas separation is achieved, but system complexity and capital costs increase
Solution Approach 1:
The zinc oxide solution serves multiple functions within the system: it absorbs both carbon dioxide and hydrogen sulfide simultaneously, can be regenerated in situ, and provides corrosion protection. This multi-functionality reduces the number of separate components and systems needed, thereby simplifying the overall system design and reducing capital costs
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
The system achieves high hydrogen diffusion efficiency, reduces palladium usage, and enhances structural integrity, enabling efficient separation of hydrogen with minimal contaminant interference and improved resistance to reverse pressurization.
Implementation Method 1
aqueous zinc oxide solution that has been heated to a temperature between 100°C and 200°C and pressurized to a pressure between 10 and 50 bar to facilitate the absorption of carbon dioxide and hydrogen sulfide
Data Source
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AI summary
A hydrogen purification system (10) that is used to separate hydrogen gas from a source gas . The hydrogen purification system (10) has a hydrogen separator (20) into which the source gas is permitted to flow. Within the hydrogen separator (20) is at least one hydrogen permeable tube (40) that is made of a hydrogen permeable material. A support tube (30) is provided for each hydrogen permeable tube (40) . A support tube (30) is coaxially aligned with the hydrogen permeable tube (40), wherein a gap space (42) exists between the hydrogen permeable tube (40) and the support tube (30) in an area of overlap. The source gas is introduced into the gap space (42) . The source gas spreads thinly over the hydrogen permeable tube (40) in the gap space (42) . Hydrogen from the source gas passes through the hydrogen permeable tube (40) in a highly efficient manner and is collected.