Hydrogen Pressure Vessel Discharge Control Under Fire Exposure
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Solution Overview
Problem
In fuel cell systems, particularly in motor vehicles, the discharge of combustible fluids like hydrogen poses a risk of ignition due to its invisible flame, especially during exceptional operating conditions such as fires, where existing temperature-pressure relief devices lack control over ambient conditions, potentially endangering rescue workers.
Innovation Solution
A discharge system with sensors to detect ambient temperature and radiation, controlling the release of combustible fluids through drain valves to prevent ignition, by selectively opening or blocking drain openings based on predefined limits, ensuring safe discharge even in hazardous environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drain valve releases the combustible fluid immediately when the temperature limit is exceeded, then the pressure relief function is achieved, but the risk of ignition increases due to high ambient temperature
Solution Approach 1:
The system dynamically adjusts the drain valve operation based on real-time ambient temperature and radiation conditions. When ambient conditions are favorable (below thresholds), the valve opens for pressure relief. When ambient conditions become hazardous (exceeding thresholds), the system closes the valve or blocks drain openings to prevent ignition, creating a dynamic response that adapts to changing environmental conditions
Solution Approach 2:
The system uses sensors to continuously monitor ambient temperature and radiation levels, feeding this information back to the control unit. The control unit processes this feedback and adjusts the drain valve operation accordingly, creating a closed-loop control system that balances pressure relief needs with ignition prevention
2Object-affected harmful factors
If the drain valve is blocked to prevent ignition in high ambient temperature, then the ignition risk is reduced, but the pressure relief function is compromised
Solution Approach 1:
The system segments the pressure relief function across multiple drain openings (first, second, and optionally third drain openings) at different locations on the pressure vessel. This allows selective operation of individual drain openings based on local ambient conditions, so that pressure relief can continue through safe openings while blocking only those in hazardous environments
Solution Approach 2:
The system applies different operational states to different drain openings based on their local ambient conditions. Each drain opening can be independently controlled based on the temperature and radiation levels at its specific location, allowing the system to maintain pressure relief capability through openings in safe zones while blocking only those in hazardous zones
3Measurement precision
If multiple sensors are installed to detect ambient conditions at different drain openings, then the precision of ambient condition detection is improved, but the device complexity increases
Solution Approach 1:
The control unit is designed to handle multiple sensor inputs and control multiple drain openings using a single integrated controller. This multi-functional approach consolidates what could be multiple separate control systems into one unit, reducing overall system complexity while maintaining the capability to monitor and control multiple locations
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 prevents the ignition of discharged hydrogen by controlling fluid release based on ambient conditions, enhancing safety during exceptional operating conditions and reducing the risk of injury to personnel.
Implementation Method 1
at least one sensor for detecting the ambient temperature and/or ambient radiation in the surroundings of the at least one drain opening
Implementation Method 2
at least one sensor for detecting the ambient temperature and/or ambient radiation in the surroundings of the at least one drain opening
Implementation Method 3
at least one drain valve for releasing the fluid from the at least one pressure vessel once the predefined limit value of the release parameter has been exceeded
Data Source
AI summary
The invention relates to a discharge system (41) for at least one pressure vessel (19) which is filled with a combustible fluid, said system being intended for releasing the combustible fluid from the at least one pressure vessel (19) into the surroundings once a predefined limit value of a release parameter has been exceeded, said system comprising: at least one drain valve (28) for releasing the fluid from the at least one pressure vessel (19) once the predefined limit value of the release parameter has been exceeded; at least one admission opening (30) for admitting the fluid from the at least one pressure vessel (19) into the at least one drain valve (28); and at least one drain opening (33) for releasing the fluid into the surroundings, wherein the discharge system (41) comprises at least one sensor (35) for detecting the ambient temperature and/or ambient radiation in the surroundings of the at least one drain opening (33), and the release of the fluid from the at least one drain opening (33) is controllable in an open loop and/or a closed loop on the basis of the ambient temperature and/or ambient radiation detected by the at least one sensor (35), also once the predefined limit value of the release parameter has been exceeded.