Fuel Cell Emergency Power and Fire Suppression System
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Solution Overview
Problem
Current emergency power systems in aircraft, such as ram-air-driven turbines, are prone to damage and have performance issues during low-speed flights, and halon-based fire extinguishing systems are environmentally hazardous, while fuel cell systems for fire suppression are inadequate for large spaces due to the quantity of oxygen-depleted air required.
Innovation Solution
An emergency supply system integrating a fuel cell, hydrogen tank, oxygen tank, extinguishing agent container, and oxidant supply unit that switches between providing emergency power and generating inert exhaust air for fire suppression, using air from the cabin or bleed air sources, and an extinguishing agent supply unit that can introduce oxygen-depleted air or additional extinguishing agents to inhibit fires, reducing weight and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ram air turbine is used for emergency power supply, then reliability is improved through redundancy, but the system is prone to blade damage from stone impact and performance degradation at low flight speeds
Solution Approach 1:
The patent extracts the vulnerable mechanical turbine components (blades, housing) from the emergency power supply system and replaces them with a fuel cell system that has no moving parts. The fuel cell stack, mounted on the aircraft fuselage, generates electricity chemically without exposure to external debris or speed-dependent performance issues.
Solution Approach 2:
The patent replaces the mechanical ram air turbine system with a chemical electrochemical system (fuel cell). The fuel cell converts chemical energy from hydrogen and oxygen directly into electrical energy, eliminating the need for mechanical rotation, blades, and aerodynamic components that are susceptible to damage.
2Reliability
If halon-based fire extinguishing systems are used, then fire suppression effectiveness is improved, but environmental harm increases due to ozone depletion and climate impact
Solution Approach 1:
The patent uses fuel cell exhaust gas, which is naturally inert (primarily nitrogen and unreacted oxygen), to suppress fires. This inert atmosphere displaces oxygen in the cargo compartment, preventing combustion without requiring halon chemicals. The exhaust gas is directed into the cargo compartment through distribution ducts.
Solution Approach 2:
The patent converts the fuel cell's exhaust gas, which would otherwise be waste, into a useful fire suppression agent. The exhaust contains inert gases that effectively suppress fires, turning a byproduct into a beneficial function and eliminating the need for separate halon extinguishing systems.
3Object-generated harmful factors
If fuel cell systems are used for fire suppression in large cargo compartments, then environmental impact is reduced, but the system becomes impractical due to the large quantity of oxygen-depleted air required
Solution Approach 1:
The patent designs the fuel cell system to serve multiple functions: primary emergency power supply, fire suppression, and oxygen generation for passenger cabins. The same fuel cell stack and exhaust gas distribution system are used across different operating modes, making the system economically viable despite the large quantity of inert gas needed for fire suppression.
Solution Approach 2:
The patent merges the fire suppression function with the power generation function by using the fuel cell exhaust gas for both purposes. The exhaust gas that would otherwise be vented is redirected to suppress fires in cargo compartments, combining two safety functions into one integrated system.
4Object-generated harmful factors
If fuel cell systems are designed for long-term fire suppression, then environmental benefits are achieved, but the system cannot quickly generate adequate quantities of exhaust air for rapid fire extinction in the first minutes
Solution Approach 1:
The patent incorporates pre-stored halon extinguishing agent bottles as a preliminary fire suppression measure. These bottles can be activated immediately upon fire detection, providing rapid initial suppression while the fuel cell system ramps up to its full exhaust gas production capacity for sustained suppression.
Solution Approach 2:
The patent implements a dynamic, two-stage fire suppression strategy: immediate activation of pre-stored halon bottles for rapid initial suppression, followed by sustained fuel cell exhaust gas injection for long-term fire control. The system transitions from chemical extinguishing to inert gas suppression as the fuel cell reaches full output.
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 reliable emergency power and fire suppression with minimal weight addition, using fuel cell-generated inert air and additional extinguishing agents, effectively addressing the limitations of existing systems by offering two operating modes for power generation and fire inhibition.
Implementation Method 1
an emergency supply system which comprises at least one fuel cell (2)
Implementation Method 2
by means of largely inert exhaust air, generated in a fuel cell process
Data Source
AI summary
An emergency supply system for a transportation means is provided. The system includes at least one fuel cell, a hydrogen tank, an oxygen tank, an extinguishing agent container, an oxidant supply unit and an extinguishing-agent supply unit. The oxidant supply unit includes an oxygen inlet connectable to the oxygen tank, an air inlet connectable to an air source, and an oxidant outlet connected to an oxidant inlet of the fuel cell. The oxidant supply unit either conveys oxygen from the oxygen inlet or air from the air inlet to the oxidant outlet. The extinguishing-agent supply unit includes a first extinguishing agent inlet connected to an exhaust air outlet of the fuel cell, a second extinguishing agent inlet connected to the extinguishing agent container, and an extinguishing agent outlet that is connectable to an extinguishing-agent inlet unit of at least one space of the transportation means.