Hydrogen Fuel Purge System for Leak and Flammability Control
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Solution Overview
Problem
Hydrogen fuel poses challenges in aircraft fuel systems due to its low boiling point, low power density, tendency to seep through materials, colorlessness and odorlessness, and high reactivity, which complicates leak detection and management, and increases the risk of flammability.
Innovation Solution
A hydrogen fuel purge system using inert purge gases, such as helium or nitrogen, actively purges fuel lines, fittings, and components to remove hydrogen in case of leaks, with a venting system to exhaust it externally, and includes vaporizers to maintain hydrogen in the liquid phase for efficient delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If hydrogen fuel is used to power aircraft engines, then carbon dioxide emissions are reduced, but the risk of flammability and leak detection difficulty increases
Solution Approach 1:
The patent introduces an inert gas (nitrogen or carbon dioxide) as an intermediary substance to purge hydrogen from fuel lines and components. This intermediary gas displaces hydrogen, creating a non-flammable atmosphere in the fuel system and eliminating the flammability risk while allowing hydrogen fuel to be used in aircraft engines
2Productivity
If hydrogen fuel is used, then energy efficiency is improved, but leak detection becomes more difficult
Solution Approach 1:
The inert gas acts as a tracer and indicator substance. When purging hydrogen from the fuel system, any leakage of the inert gas can be detected using standard detection methods, providing a measurable signal that indicates potential system failures while maintaining the energy efficiency benefits of hydrogen fuel
3Object-affected harmful factors
If hydrogen fuel lines are purged with inert gas, then flammability risk is reduced, but system complexity increases
Solution Approach 1:
The purge system is designed to perform multiple functions: it removes hydrogen from fuel lines, provides a non-flammable atmosphere, enables leak detection, and prepares the system for fuel type transitions. By combining these functions into a single inert gas delivery system, the patent reduces overall system complexity while achieving multiple safety and operational benefits
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 effectively manages hydrogen leaks, reduces the risk of flammability, and ensures stable hydrogen fuel delivery to the engine, enhancing safety and operational reliability of aircraft fuel systems.
Implementation Method 1
The fuel system includes a vaporizer to heat the liquid hydrogen fuel flowing through the fuel delivery assembly
Implementation Method 2
A purge gas delivery assembly includes a hydrogen fuel source, and a pump configured to increase a pressure of the purge gas to a pressure sufficient to push the hydrogen fuel through the fuel delivery assembly, the vent line, and out the vent
Data Source
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AI summary
A hydrogen fuel system (200) including a fuel delivery assembly (202), a purge gas source (310), and a vent opening (324). The fuel delivery assembly (202) is configured to receive hydrogen fuel from a hydrogen fuel source (210) and to provide the hydrogen fuel from the hydrogen fuel source (210) to a power generator. The purge gas source (310) is fluidly coupled to the fuel delivery assembly (202) and configured to provide a purge gas to the fuel delivery assembly (202). The vent opening (324) is fluidly coupled to the fuel delivery assembly (202) and configured to vent hydrogen fuel from the fuel delivery assembly (202) when the purge gas is provided to the fuel delivery assembly (202).