Composite Hydrogen Pipeline Structure for Real-Time Leak Localization
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Solution Overview
Problem
Current hydrogen transport pipelines face challenges in real-time monitoring of hydrogen leakage due to rapid diffusion and low concentration detection, leading to safety risks and difficulties in precise leak location, especially with existing nondestructive and condition monitoring technologies.
Innovation Solution
A composite pipeline structure comprising a plastic pipe, a polyurethane foam layer, and a plastic protection layer, where the polyurethane foam layer with high porosity contains and gathers leaked hydrogen, and fiber optic hydrogen sensors detect concentrations in real-time, allowing for precise leak location and reduced hydrogen loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal pipes (seamless steel pipes with alloying elements) are used for hydrogen transport, then strength and corrosion resistance are improved, but hydrogen embrittlement sensitivity increases
Solution Approach 1:
The patent employs a composite pipeline structure consisting of an inner plastic pipe layer, a middle polyurethane foam layer, and an outer plastic protection layer. This composite structure combines the advantages of different materials: the inner plastic pipe provides hydrogen compatibility and prevents embrittlement, the foam layer offers insulation and mechanical protection, and the outer layer provides additional protection against environmental factors. This resolves the contradiction by eliminating metal contact with hydrogen while maintaining overall pipeline strength.
2Speed
If hydrogen leaks from the pipeline, then hydrogen diffusion is rapid, but detection accuracy decreases due to low concentration and fast escape
Solution Approach 1:
The patent introduces evacuation pipes as intermediary channels that provide a controlled path for leaked hydrogen to escape into. These pipes are strategically positioned along the pipeline route and connected to the inner pipe through penetration holes. When hydrogen leaks, it follows the path of least resistance through these evacuation pipes to designated escape points, where sensors can detect the accumulated hydrogen before it disperses into the atmosphere. This mediator structure slows down the effective diffusion rate and concentrates hydrogen at detectable locations.
Solution Approach 2:
The evacuation pipes are pre-installed along the hydrogen transport pipeline at regular intervals before any leakage occurs. These pipes are positioned and configured in advance to create a network of detection points. When a leak happens, the pre-positioned evacuation pipes immediately begin to channel and concentrate the leaking hydrogen at specific locations, allowing sensors to detect the presence of hydrogen before it diffuses too widely and becomes undetectable.
3Reliability
If nondestructive detection technology is used for pipeline monitoring, then safety monitoring is provided, but real-time leakage detection and precise location capability are insufficient
Solution Approach 1:
The patent divides the continuous pipeline into discrete monitoring segments by installing multiple evacuation pipes at regular intervals along the pipeline route. Each evacuation pipe serves as an independent detection zone with its own sensor. When hydrogen is detected in a specific evacuation pipe, the system can immediately identify which segment contains the leak, narrowing down the location to a specific section between two adjacent evacuation pipes. This segmentation transforms continuous monitoring into discrete, location-specific detection, significantly improving positional accuracy.
Solution Approach 2:
The evacuation pipes act as intermediary structures that physically channel leaked hydrogen from the main pipeline to specific detection points. By introducing these intermediate channels, the system transforms the diffuse leakage problem into concentrated detection opportunities at predetermined locations. The evacuation pipes mediate between the leak source and the sensors, ensuring that hydrogen reaches detectable concentrations at specific points while providing spatial information about the leak location.
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 composite pipeline structure effectively contains hydrogen leaks, enhances safety by reducing diffusion and loss, and enables real-time monitoring of hydrogen concentrations, facilitating rapid detection and localization of leaks, thus ensuring safer hydrogen transport.
Implementation Method 1
the polyurethane foam layer with high porosity contains and gathers leaked hydrogen
Implementation Method 2
fiber optic hydrogen sensors detect concentrations in real-time
Data Source
AI summary
Methods, devices, and systems for monitoring hydrogen leakage using a composite pipeline for transporting hydrogen are provided. In one aspect, a system of real-time whole-pipeline monitoring hydrogen leakage includes: a composite pipeline including a plastic pipe, a polyurethane foam layer, and a plastic protection layer that are disposed in sequence from inside to outside; joints for connecting sections of the composite pipeline; evacuation pipes; and hydrogen sensors. Each of the evacuation pipes is installed at a corresponding joint of the joints, and each hydrogen sensor is disposed in a corresponding evacuation pipe of the evacuation pipes.