Fuel Cell Fire Suppression Using Nitrogen-Enriched Exhaust
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Solution Overview
Problem
Current fire extinguishing systems, such as those using halogenated hydrocarbons, pose environmental concerns and are not suitable for safe re-entry of rooms after fire suppression, as they deplete stratospheric ozone and require larger extinguisher devices.
Innovation Solution
A fire fighting system utilizing a fuel cell to produce nitrogen-enriched cathode exhaust air, which is directed to the fire source to reduce oxygen levels, potentially eliminating the need for traditional extinguishers and allowing for controlled oxygen adjustment to ensure safe re-entry and preventive fire suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogenated hydrocarbons (Halon) are used for fire extinguishing, then fire suppression effectiveness is improved, but environmental harm increases due to stratospheric ozone depletion
Solution Approach 1:
The patent applies the inert atmosphere principle by using nitrogen-enriched exhaust air from fuel cells to displace oxygen around fire sources. Nitrogen is inherently inert and does not support combustion, providing effective fire suppression without the environmental harm of halogenated hydrocarbons. The system continuously supplies nitrogen-rich atmosphere to protected spaces, creating an inert environment that prevents fire ignition and propagation.
2Reliability
If traditional fire extinguishers are used, then fire suppression capability is maintained, but device size and complexity increase
Solution Approach 1:
The patent merges the fire suppression function with the existing fuel cell power system by utilizing its nitrogen-enriched exhaust air. Instead of requiring separate fire extinguisher devices, the fuel cell's waste exhaust stream is repurposed for fire protection. This integration eliminates the need for additional extinguishing equipment while maintaining suppression capability, as the nitrogen-rich exhaust naturally accumulates around fire sources and suppresses combustion.
Solution Approach 2:
The fuel cell system serves itself by using its own exhaust air for fire suppression. The nitrogen-enriched exhaust, which would otherwise be wasted, is redirected to protect the fuel cell and surrounding equipment. This self-service approach eliminates the need for external fire suppression systems, reducing overall device complexity and size while maintaining reliable fire protection.
3Object-affected harmful factors
If oxygen content in rooms is reduced for fire prevention, then fire danger is decreased, but safe re-entry becomes difficult without precise control
Solution Approach 1:
The patent implements feedback control by continuously monitoring oxygen content in protected spaces and adjusting the fuel cell's air supply accordingly. Oxygen sensors detect the current oxygen level, and this information feeds back to the control system, which modulates the amount of air supplied to the fuel cell. This closed-loop control ensures oxygen is maintained within safe limits for fire prevention while automatically adjusting to permit safe re-entry when conditions are appropriate, eliminating the need for manual intervention.
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 extinguishes fires by reducing oxygen levels with nitrogen-rich exhaust air, enabling safe re-entry and potentially eliminating the need for hazardous halogenated hydrocarbons, while being environmentally friendly and self-sustaining.
Implementation Method 1
a fuel cell for producing a nitrogen-enriched cathode exhaust air
Implementation Method 2
a fuel cell for producing a nitrogen-enriched cathode exhaust air
Implementation Method 3
a conduit assembly for conducting the nitrogen-enriched cathode exhaust air to the fire source, so that an oxygen content around the source of the fire is reduced
Data Source
AI summary
A fire fighting system for extinguishing a fire, which has a fuel cell for producing a nitrogen-enriched cathode exhaust air. The fuel cell is supplied with air and a fuel. Within the fuel cell, the air is then reduced to a determined oxygen content. The exhaust air is supplied to the fire source.