Fixed-Bed FeOx Reactor for Explosion-Proof Seasonal Energy Storage
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Solution Overview
Problem
Current energy storage systems, particularly those using the redox pair Fe3O4/Fe, are complex, prone to malfunction, and pose explosion risks, making them unsuitable for domestic use due to high maintenance requirements and safety concerns.
Innovation Solution
A reactor system filled with a fixed bed of particles of formula FeOx, where 0≤x≤1.5, which is explosion-proof and designed for seasonal energy storage, allowing conversion of hydrogen to water and vice versa, eliminating the need for agitation and reducing maintenance through a cavity-free filling that prevents hydrogen accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a redox pair Fe3O4/Fe system is used for energy storage, then energy storage capacity is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent combines the reactor and storage function into a single integrated system where the fixed bed of iron oxide/iron particles serves both as the reaction medium and the energy storage medium. This eliminates the need for separate storage devices and reduces system complexity while maintaining energy storage capacity.
Solution Approach 2:
The fixed bed material serves multiple functions simultaneously: it acts as the redox active material for energy storage, provides the reaction surface for hydrogen conversion, and maintains structural integrity without requiring additional components. This multi-functionality reduces overall system complexity.
2Quantity of substance
If a redox pair Fe3O4/Fe system with solid material movement is used, then energy storage is achieved, but reliability decreases due to malfunction risks
Solution Approach 1:
The system divides the fixed bed into discrete particles of iron oxide/iron that remain stationary in the reactor. This segmentation allows each particle to function independently while maintaining overall system reliability, as there is no moving solid material that could cause malfunctions.
Solution Approach 2:
Instead of moving solid material between storage and reaction zones as in conventional systems, this invention keeps the solid redox material stationary in the reactor and moves only the gas phase (hydrogen/steam) through it. This inversion eliminates mechanical complexity and improves reliability.
3Quantity of substance
If hydrogen is stored in a conventional system, then energy density is improved, but safety deteriorates due to explosion risks
Solution Approach 1:
The reactor operates with a fixed bed of iron oxide/iron particles that creates an inert environment. Hydrogen is immediately converted to steam upon contact with the hot iron oxide, preventing the accumulation of explosive hydrogen atmospheres. The iron oxide acts as an oxygen carrier that safely manages hydrogen without creating explosion hazards.
Solution Approach 2:
The patent converts the potential harm of hydrogen accumulation and explosion risk into a benefit by using the iron oxide to immediately react with and convert hydrogen to steam. The potential explosive mixture becomes a controlled chemical reaction that stores energy safely in the reduced iron.
4Quantity of substance
If seasonal energy storage capacity is increased, then renewable energy utilization is improved, but battery performance deteriorates due to slow discharge
Solution Approach 1:
The system changes the operational parameters by maintaining the fixed bed at elevated temperatures (above 500°C) during storage and using this thermal energy during discharge. This temperature parameter change enables the iron to rapidly convert steam back to hydrogen, providing both seasonal storage capacity and rapid discharge capability.
Solution Approach 2:
The fixed bed uses composite iron oxide/iron particles that combine the oxygen-carrying capacity of iron oxide with the hydrogen-absorbing properties of iron. This composite material enables both long-term storage stability and rapid hydrogen release when needed, overcoming the slow discharge limitation of conventional batteries.
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 provides a reliable and safe energy storage solution for domestic use by ensuring the reactor is inherently explosion-proof, reducing maintenance needs, and enhancing safety, while effectively storing and releasing energy over seasonal fluctuations in renewable energy production.
Implementation Method 1
The reactors allow the conversion of hydrogen to water (thereby capturing the thus obtained chemical energy) and its reverse reaction (thereby releasing hydrogen)
Implementation Method 2
capturing the thus obtained chemical energy
Implementation Method 3
the conversion of hydrogen to water (thereby capturing the thus obtained chemical energy) and its reverse reaction (thereby releasing hydrogen)
Data Source
AI summary
The present invention relates to energy storage systems and reactors useful in such systems. Inventive reactors comprise a reaction vessel defining an inner volume and a compensation element, whereby said inner volume is filled with a fixed bed that is free of cavities and that comprises particles of formula (I), FeOx (I), where 0≤x≤1.5; said compensation element is adapted to adjust said inner volume. The reactors are inherently explosion proof and thus suited for domestic use. The systems are useful for compensating long-term fluctuations observed in production of renewable energy.