Graphite Thermal Storage With Inert-Gas Fire Protection
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Solution Overview
Problem
Current thermal energy storage systems using graphite as a heat storage medium face safety risks due to the combustibility of graphite at high temperatures, and existing battery solutions are expensive and limited for long-term energy storage.
Innovation Solution
A thermal energy storage apparatus that encases graphite in an inert gas atmosphere within a sealed housing, using conduits for heat transfer with supercritical fluids like CO2 to store and release thermal energy safely and efficiently, with oxygen monitoring and control systems to prevent fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If graphite is used as a heat storage medium at high temperatures, then energy storage capacity is improved, but fire risk increases due to graphite combustibility
Solution Approach 1:
The patent applies an inert gas atmosphere (such as nitrogen or carbon dioxide) within the housing to surround the graphite heat storage medium. This inert environment prevents oxygen from contacting the hot graphite, thereby eliminating the fire risk while maintaining the high temperature operation needed for effective thermal energy storage. The inert atmosphere allows the system to achieve high energy storage capacity without the harmful combustibility issue.
2Reliability
If graphite is enclosed in a sealed housing with inert gas, then safety is improved, but device complexity increases
Solution Approach 1:
The patent divides the thermal energy storage system into distinct functional modules: a sealed housing containing the inert gas atmosphere, graphite heat storage blocks, and separate conduit assemblies for heat transfer. This segmentation allows each component to be optimized independently and simplifies assembly, maintenance, and safety monitoring, thereby improving reliability without excessive complexity.
Solution Approach 2:
The patent introduces a fluid conduit system as an intermediary between the external environment and the sealed graphite chamber. This intermediary allows heat transfer to and from the graphite without requiring direct contact with oxygen or external atmosphere, maintaining safety while enabling controlled thermal energy exchange. The conduit acts as a mediator that decouples the safety-critical sealed environment from the operational heat transfer requirements.
3Duration of action of moving object
If conventional batteries are used for energy storage, then short-term grid stabilization is achieved, but cost and long-term storage capability worsen
Solution Approach 1:
The patent changes the fundamental operating parameters from electrical energy storage (batteries) to thermal energy storage. By storing energy as heat in graphite at elevated temperatures rather than chemical energy in batteries, the system achieves much longer storage durations (hours to days) at lower cost. The thermal energy can be retained in the graphite for extended periods with minimal loss, enabling long-term storage applications that are economically viable compared to battery solutions.
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 safe, efficient, and scalable method for storing and distributing thermal energy, enhancing energy storage capacity and reducing fire risks, while achieving higher energy conversion efficiencies compared to traditional systems.
Implementation Method 1
the chamber arranged in use to house graphite solids material in an inert gas atmosphere therewithin
Implementation Method 2
the or each conduit is arranged for conveying a flow of a fluid therethough such that in a first configuration, said flow transfers thermal energy to the graphite solid material
Implementation Method 3
in a first configuration, said flow transfers thermal energy to the graphite solid material
Implementation Method 4
graphite is particularly useful in this role
Data Source
AI summary
The present invention provides a thermal energy storage apparatus comprising a housing which defines a hollow interior chamber, the chamber arranged in use to house graphite solids material in an inert gas atmosphere therewithin; and at least one conduit arranged to extend through the hollow interior chamber via inlet and outlet openings in the housing, the conduit being sealingly fitted to the housing at the inlet and outlet openings, and an exterior surface of the or each conduit being arranged in a close facing relationship with the graphite solids material located within the hollow interior chamber, wherein, in use, the or each conduit is arranged for conveying a flow of a fluid therethough such that in a first configuration, said flow transfers thermal energy to the graphite solid material, and in a second configuration, the graphite solid material transfers thermal energy to said flow.