Hydrogen Gas Sampling Device with Pressure Reduction
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Solution Overview
Problem
Current hydrogen sampling devices for fuel cell applications face challenges in obtaining representative samples at high pressures with low impurity levels, requiring complex and costly setups that are not compatible with the stringent purity and safety requirements of hydrogen fueling stations.
Innovation Solution
A gas sampling device integrated into a housing with a calibrated orifice system and pressure regulators, allowing for selective isolation and reduction of gas pressure, combined with a chemically deactivated collection container to prevent contamination and facilitate safe sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sampling device is installed at high pressure outlet to obtain representative hydrogen samples, then the sample representativity is improved, but the equipment complexity and safety requirements increase
Solution Approach 1:
The sampling device is divided into distinct functional modules: a sampling line with calibrated orifices for flow control, a pressure reduction system with regulators, a collection container for sample storage, and a venting system. This segmentation allows each component to be optimized independently and simplifies the overall system architecture.
Solution Approach 2:
A calibrated orifice is introduced as an intermediary element between the high-pressure hydrogen source and the sampling system. This orifice acts as a flow restrictor that enables controlled sampling while maintaining system pressure integrity and reducing the complexity of flow control mechanisms.
2Manufacturing precision
If chemical passivation is applied to prevent contaminant adsorption, then the gas purity is improved, but the manufacturing complexity increases
Solution Approach 1:
The collection container and sampling line are chemically passivated by treating internal surfaces with substances that reduce reactivity and prevent adsorption of contaminant species. This creates an inert environment that preserves sample purity without requiring complex manufacturing processes.
Solution Approach 2:
The sampling device is designed as a disposable or easily replaceable unit. After use, the entire assembly can be discarded or regenerated, eliminating the need for complex cleaning and repassivation procedures and simplifying the manufacturing process.
3Adaptability or versatility
If pressure reduction is implemented to enable laboratory analysis, then the analysis compatibility is improved, but the device complexity increases
Solution Approach 1:
Pressure regulators are introduced as intermediary devices that mediate between the high-pressure hydrogen source and the low-pressure laboratory analysis equipment. These regulators provide controlled pressure reduction while maintaining system simplicity through standardized components.
Solution Approach 2:
The system changes the pressure parameter of the hydrogen sample from high pressure (suitable for storage and transport) to low pressure (suitable for laboratory analysis). This parameter transformation enables compatibility with standard analytical equipment without requiring complex pressure management systems.
4Ease of operation
If a removable inlet connector is used for sampling, then the operational flexibility is improved, but the risk of contamination increases
Solution Approach 1:
The inlet connector and sampling line are pre-passivated with chemical treatments that create a protective layer against contaminant adsorption. This preliminary action ensures that even though the connector is removable and reusable, the contamination risk remains minimal.
Solution Approach 2:
The removable inlet connector is designed with internal surfaces that maintain an inert environment, preventing contamination during connection and disconnection operations. This allows operational flexibility while preserving sample integrity.
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
Enables efficient and safe sampling of hydrogen at low pressures, compatible with laboratory analysis for fuel cell applications, reducing equipment complexity and cost while ensuring purity and safety standards are met.
Implementation Method 1
a first pressure regulator configured to reduce the pressure of the gas
Implementation Method 2
a second pressure regulator configured to reduce the pressure of the gas to a value between 1.5 and 5 bar
Data Source
AI summary
The invention relates to a gas sampling device for a filling station for hydrogen tanks, said device comprising a circuit (2, 3, 5) comprising a first upstream end provided with an inlet connector (4) to be detachably connected to an outlet connector (6) of a filling station (34), and two conduits respectively for sampling (2) and filling (5) connected in parallel to the inlet connector (4), the sampling conduit (2) comprising a valve system (9, 10, 11), a first pressure reducing valve (7) and a container (8) for collecting a sample of gas expanded by said first pressure reducing valve (7), and the filling conduit (5) comprising a downstream end provided with a first outlet connector (12) to be detachably connected to an inlet connector (35) of a tank (13, 14) to be filled.