Regenerative Fuel Cell Oxygen Zoning for Tunnel Fire Evacuation
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Solution Overview
Problem
Tunnels in mountainous terrain are prone to fires, which can lead to significant loss of life due to toxic gas accumulation and low oxygen levels, necessitating systems that can identify fire zones and supply oxygen to unaffected areas.
Innovation Solution
A unitized regenerative fuel cell system integrated with fire-detecting sensors and oxygen feeders to supply oxygen to non-affected zones, utilizing a fuel cell mode for power generation and water electrolysis mode for hydrogen and oxygen production, with storage units and control mechanisms to manage oxygen and power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fire detection and oxygen supply system is installed in the tunnel, then the ability to identify fire zones and supply oxygen to unaffected areas is improved, but the device complexity and system cost increase
Solution Approach 1:
The tunnel is divided into multiple zones with individual fire-detecting sensors and oxygen feeders for each zone. The controller independently controls oxygen supply to each zone based on fire detection results, enabling targeted response and reducing unnecessary system-wide oxygen supply.
Solution Approach 2:
The unitized regenerative fuel cell serves multiple functions: it generates electricity through fuel cell mode and produces hydrogen and oxygen through water electrolysis mode. The oxygen produced is stored and used for fire suppression, while hydrogen can be used for power generation during emergencies.
2Ease of manufacture
If the tunnel is completely blocked with only entrance and exit openings, then construction costs are reduced, but the evacuation time required during fires increases significantly
Solution Approach 1:
The system proactively supplies oxygen to zones before fires spread to them, based on fire detection in adjacent zones. This preliminary oxygen supply creates oxygen-rich safe zones that facilitate faster evacuation and reduces the time passengers need to spend in toxic environments.
3Quantity of substance
If oxygen is supplied to all zones during a fire, then oxygen availability is maximized, but oxygen is wasted in zones where fire has already occurred
Solution Approach 1:
Oxygen supply is selectively applied to specific zones based on real-time fire detection data. Zones without detected fires receive oxygen supply, while zones with fires have their oxygen feeders closed. This localized approach ensures oxygen is delivered where needed without waste in already-affected areas.
4Quantity of substance
If the unitized regenerative fuel cell operates continuously in water electrolysis mode to produce oxygen, then oxygen availability is improved, but energy consumption increases
Solution Approach 1:
The unitized regenerative fuel cell alternates between fuel cell mode for electricity generation and water electrolysis mode for oxygen production based on system needs and fire detection. Oxygen is produced periodically rather than continuously, and stored in the oxygen storage unit for later use during fires.
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 maintains oxygen levels and reduces life loss by supplying oxygen to unaffected tunnel sections during fires, enhancing system efficiency and stability.
Implementation Method 1
a unitized regenerative fuel cell capable of electricity general and hydrogen and oxygen production to alternatingly carry out electricity generation and oxygen and hydrogen production
Implementation Method 2
a unitized regenerative fuel cell capable of electricity general and hydrogen and oxygen production to alternatingly carry out electricity generation and oxygen and hydrogen production
Data Source
AI summary
Disclosed is a unitized regenerative fuel cell system, comprised of a unitized regenerative fuel cell able to operate in a fuel cell mode for electric power generation and in a water electrolysis mode for hydrogen and oxygen production, and a plurality of fire-detecting sensors for detecting fire in each zone of a tunnel, and configured to supply oxygen to zones wherein fire has not occurred if occurrence of fire has been detected in a tunnel, and a method for controlling the same.