Ammonia Storage Leak Detection via Inverted Gas Sensing
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Solution Overview
Problem
Existing ammonia storage systems lack effective leak detection methods, particularly in thermally activatable systems where ammonia pressure drops below ambient pressure during idle modes, making it difficult to detect leaks without external gas intrusion.
Innovation Solution
A gas detector is integrated within the ammonia-containing section to detect gases other than ammonia, utilizing thermal conductivity and heat capacity changes to identify external gases entering the system, which can be combined with a thermal flow sensor for enhanced detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ammonia detectors are placed outside the ammonia containing section, then leak detection is simplified, but detection reliability deteriorates when ammonia pressure drops below ambient pressure
Solution Approach 1:
Instead of detecting ammonia leaks by sensing ammonia gas accumulation outside the system, the invention inverts the approach by detecting the presence of external gases (nitrogen, oxygen) inside the ammonia-containing section. This inversion works because when the system is in idle mode and ammonia pressure drops below ambient pressure, any external gas present inside the section indicates a leak, providing reliable detection without requiring complex external sensing arrangements.
2Reliability
If pressure detectors are provided within the ammonia containing section, then leak detection capability is improved, but device complexity increases
Solution Approach 1:
The invention employs a gas detector that serves multiple functions: it detects the presence of external gases indicating leaks, and can also serve as a thermal flow sensor for monitoring ammonia flow rates. By combining leak detection and flow measurement in a single device with shared heater and temperature sensors, the system achieves improved leak detection capability without proportionally increasing device complexity.
3Use of energy by moving object
If the system operates in idle mode with ammonia pressure below ambient pressure, then energy consumption is reduced, but leak detection becomes difficult
Solution Approach 1:
The invention specifically addresses the idle mode detection difficulty by inverting the detection logic. Instead of trying to detect ammonia leakage during low-pressure idle mode, the system detects the presence of external gases (nitrogen, oxygen) inside the ammonia-containing section. Since external gases would not normally be present, their detection reliably indicates a leak even when ammonia pressure is below ambient pressure, enabling effective leak detection during energy-efficient idle operation.
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
This approach allows for reliable leak detection by identifying external gases when the system is in idle mode, preventing ammonia leaks and ensuring system integrity, suitable for applications in vehicles and other ammonia storage systems.
Implementation Method 1
the gas detector is a thermal detector that measures a parameter depending on one of the thermal conductivity and the heat capacity of the gas in the ammonia containing section of the system. When an external gas enters this section the thermal conductivity and the heat capacity change which can be used to detect the presence of the external gas.
Implementation Method 2
the gas detector is a thermal detector that measures a parameter depending on one of the thermal conductivity and the heat capacity of the gas in the ammonia containing section of the system.
Data Source
AI summary
A system for storing ammonia comprises gas detector that is able to detect gases other than ammonia. The system further comprises thermally activatable ammonia stores, which can be activated to release ammonia upon heating. When the ammonia stores are not heated, the system is below ambient pressure and any leak will cause external gas to enter the system. Therefore, the gas detector is used to detect the presence of such external gas, which allows to detect leaks. The gas detector may be embodied as a thermal detector using a single heater and two temperature sensors for detecting a gas flow as well as external gas.