Gas Sensor Flame Arrester for Hydrogen Leak Explosion Containment
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Solution Overview
Problem
The challenge in the field of electromobility is the safe and reliable detection of hydrogen gas leaks from storage tanks and lines in fuel cell systems, as hydrogen reacts exothermally with oxygen, posing a risk of explosion.
Innovation Solution
A gas sensor design incorporating a sensor element, encapsulation, and a flame arrester to prevent the spread of potential explosion waves, featuring through-openings or flame-retardant layers to block flame propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas sensor is used to detect hydrogen gas leaks, then the detection capability is improved, but the risk of explosion spread to the sensor increases
Solution Approach 1:
The patent introduces a flame arrester as an intermediary component between the hydrogen gas environment and the sensor element. This flame arrester prevents direct contact between potential ignition sources and the sensor, allowing the sensor to detect hydrogen leaks while protecting it from explosion damage. The flame arrester acts as a mediator that blocks harmful factors while permitting gas detection functionality.
Solution Approach 2:
The sensor system is segmented into distinct functional components: the sensor element for detection, the encapsulation for protection, and the flame arrester for explosion prevention. This segmentation allows each component to perform its specific function independently, with the flame arrester specifically addressing the explosion risk while the sensor element maintains its detection capability.
2Measurement precision
If the sensor element is directly exposed to the gas to be detected, then the detection precision is improved, but the sensor becomes vulnerable to heat and explosion spread
Solution Approach 1:
The flame arrester serves as an intermediary structure that allows gas molecules to pass through to the sensor element for precise detection, while simultaneously blocking the propagation of heat and flames. This mediator enables the sensor to maintain direct exposure to the target gas for accurate measurement while protecting it from thermal damage.
Solution Approach 2:
The encapsulation and flame arrester provide localized protection specifically to the sensor element without interfering with its detection function. The flame arrester's structure is designed with specific local properties - allowing gas permeability while blocking flame propagation - to address the heat exposure issue at the sensor location while maintaining detection precision.
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
Ensures safe operation by preventing the further spread of explosion waves, adhering to safety standards like ISO 26262, and protecting vehicles and personnel from potential damage.
Implementation Method 1
a flame arrester, which is arranged in the opening of the encapsulation
Implementation Method 2
gas sensors which are flange-mounted in a suitable way on tanks or lines and can for example determine the partial pressure of the hydrogen in a water/hydrogen mixture
Implementation Method 3
gaseous hydrogen reacts exothermally with oxygen from the air over a wide ignition range, even with low ignition energy (explosive gas reaction)
Data Source
AI summary
A gas sensor includes a sensor element for the detection of a gas, an encapsulation, which surrounds the sensor element and has an opening for a gas to be detected to pass through to the sensor element, and a flame arrester, which is arranged in the opening of the encapsulation.