Microcylinder Hydrogen Storage with Thermal Release
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Solution Overview
Problem
Current methods for storing and liberating compressed hydrogen face challenges such as low temperature-induced release rates and microcapsule breakage due to increased pressure, and mechanical openers destroy the microcapsules, making them non-reusable.
Innovation Solution
A novel apparatus with a housing, cartridge of hollow microcylinders, a controllable discharge valve, and a gas liberating tool using a thermal opener and electric drive, along with a control system that includes sensors and a controller for managing the liberation process, allowing for controlled release and safe storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrogen is stored in microcapsules and heated to increase diffusion rate for release, then hydrogen liberation rate is improved, but microcapsule breakage increases due to increased pressure and decreased glass tensile strength
Solution Approach 1:
The invention divides the storage system into multiple microcapsules containing hydrogen and separate microcapsules containing the metal catalyst. This segmentation allows the hydrogen storage function and the catalytic function to be separated, enabling the metal catalyst to be replenished without replacing the entire microcapsule array, thus improving reliability while maintaining high liberation rates.
Solution Approach 2:
The invention changes the chemical parameter by introducing a metal catalyst (such as platinum, palladium, or nickel) that facilitates hydrogen release through catalysis rather than relying solely on thermal diffusion. This parameter change enables hydrogen release at lower temperatures, reducing microcapsule pressure and preventing breakage while maintaining high liberation rates.
2Productivity
If a mechanical opener is used to liberate hydrogen from microcapsules, then hydrogen release is achieved, but the microcapsules are destroyed and cannot be reused
Solution Approach 1:
The invention replaces the mechanical opener system with a chemical catalytic system. Instead of mechanically breaking open microcapsules to release hydrogen, a metal catalyst promotes chemical decomposition of the hydrogen-containing compound, enabling controlled hydrogen release without destroying the microcapsule structure and allowing for reuse.
Solution Approach 2:
The metal catalyst embedded in the microcapsule array facilitates the decomposition reaction automatically when exposed to appropriate conditions (such as temperature increase or contact with the catalyst), eliminating the need for external mechanical intervention and enabling the system to self-regulate the hydrogen release process without destroying the container.
3Productivity
If the activation energy for hydrogen permeation through glass is increased to exceed 57 kJ/mol, then hydrogen liberation rate at practical temperatures is improved, but the required temperature exceeds 600°C causing microcapsule breakage
Solution Approach 1:
The invention changes the mechanism from thermal diffusion (governed by activation energy) to catalytic decomposition (governed by catalyst activity). This parameter change allows hydrogen release at much lower temperatures since the metal catalyst lowers the effective activation energy barrier, eliminating the need to heat to 600°C and preventing microcapsule breakage.
Solution Approach 2:
The metal catalyst acts as an intermediary substance that mediates the hydrogen release process. Instead of directly heating the hydrogen-containing compound to facilitate decomposition, the metal catalyst provides an alternative pathway with lower energy requirements, enabling the process to occur at practical temperatures without damaging the microcapsule structure.
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 apparatus enables efficient and safe storage and liberation of hydrogen, maintaining microcapsule integrity and allowing for repeated use, while also being adaptable for other gases, thus improving safety and reducing costs.
Implementation Method 1
a heating element configured for heating the alloy to melt the alloy
Implementation Method 2
compressing the gas in the chamber, thereby providing permeation of the gas through the open ends into the hollow microcylinders
Implementation Method 3
If heated, the glass permeability to hydrogen will increase. Hydrogen can diffuse into the hollow cores of the microspheres and/or microcylinders through the thin glass walls at a rate strongly depending upon the wall temperature
Data Source
AI summary
An apparatus for storage and liberation of compressed hydrogen or other gases is provided. The apparatus includes a housing defining a chamber that includes a cartridge comprising an array of hollow microcylinders defining cavities for storage compressed gas. Each microcylinder has at least one end sealed with a plug made of an easily meltable alloy. The apparatus also includes a gas liberating tool configured for controllable liberating the gas from the cartridge into the chamber; and a control system operatively coupled to the discharge valve and liberating tool, and configured for controlling operation thereof. According to another aspect of the invention, there are provided a system and method for filling a cartridge having an array of hollow microcylinders having open ends. The filling includes placing the cartridge into a chamber of an autoclave, and compressing the gas in the chamber, thereby providing permeation of the gas through the open ends into cavities of the microcylinders. Thereafter, the open ends are sealed with plugs made of an easily meltable alloy.