Infrared Generator Leak Detection Using Cooled Tracer Gas Imaging
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Solution Overview
Problem
Conventional methods for detecting hydrogen leaks in hydrogen-cooled generators are time-consuming, invasive, and pose environmental and safety risks due to the use of hazardous tracer gases like SF6, and lack remote, sensitive, accurate, and on-line detection capabilities.
Innovation Solution
A system using a non-corrosive tracer gas like carbon dioxide, introduced into the generator, combined with an infrared imaging device cooled to -80°C to -200°C, allows for remote and accurate detection of gas leaks by visualizing the tracer gas cloud through a narrow bandpass filter, enabling on-line and on-grid leak detection without derating the generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional leak detection methods (bubble test, halogen leak detector) are used, then leak location can be identified, but the process is time-consuming and requires the generator to be offline for at least 24 hours
Solution Approach 1:
The patent replaces conventional mechanical probe-based detection methods with an optical detection system using an infrared camera and tracer gas. The infrared camera remotely detects tracer gas clouds without physical contact, eliminating the need for time-consuming manual probing and allowing online detection while the generator operates normally.
Solution Approach 2:
The patent introduces a tracer gas (such as sulfur hexafluoride or perfluorocarbon) as an intermediary substance that mixes with hydrogen and leaks along with it. The tracer gas has distinct infrared absorption characteristics that allow it to be detected by the infrared camera, enabling indirect detection of hydrogen leaks without directly measuring hydrogen itself.
2Measurement precision
If SF6 is used as tracer gas, then leak detection sensitivity is improved, but environmental and safety concerns arise due to its hazardous nature
Solution Approach 1:
The patent changes the chemical parameters of the tracer gas from highly reactive or hazardous substances to environmentally benign alternatives such as perfluorocarbons or sulfur hexafluoride at controlled concentrations. These gases maintain strong infrared absorption characteristics for sensitive detection while being non-corrosive and safe for use around operating generators and personnel.
Solution Approach 2:
The patent uses tracer gases that can be introduced in controlled amounts, detected, and then allowed to dissipate naturally without long-term environmental persistence or accumulation. The tracer gas serves its detection purpose and is then vented, replacing the need for permanent installation of hazardous detection systems.
3Measurement precision
If close contact sniffer technology is used, then leak detection capability is achieved, but the method is painstakingly time-consuming and may miss internal seal cracks
Solution Approach 1:
The patent transitions from one-dimensional point-by-point probe scanning to two-dimensional or three-dimensional visual field detection using an infrared camera. The camera captures the entire generator exterior simultaneously, allowing operators to visually locate leak sources across large surfaces without methodically probing each area, dramatically reducing operational complexity.
Solution Approach 2:
The infrared camera system allows the detection process to proceed autonomously without requiring operators to manually position probes or interpret complex sensor data in real-time. The camera automatically captures infrared images showing tracer gas cloud distributions, and software can automatically analyze the images to identify leak locations, reducing manual effort and operational complexity.
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 solution provides a fast, safe, and non-corrosive method for detecting hydrogen leaks, avoiding environmental and safety concerns, and allowing generators to remain online during detection, significantly reducing downtime and operational losses.
Implementation Method 1
An infrared imaging device is adapted to display an image of the escaping tracer gas
Implementation Method 2
The infrared imaging device comprises a cooled detector and a filter with a spectral response between about 3 μm and about 5 μm
Implementation Method 3
a filter with a spectral response between about 3 μm and about 5 μm
Implementation Method 4
The infrared imaging device is a cooled detector and a filter with a spectral response between about 3 μm and about 5 μm. At least one of the detector and the filter is cooled to between about −80° C. and about −200° C.
Data Source
AI summary
A system for detecting a gas leak in a generator includes a source of carbon dioxide gas, and a subsystem for introducing the carbon dioxide gas into the generator. An infrared imaging device is adapted to communicate with a notification device to display an image of at least a portion of the generator and the carbon dioxide gas. The infrared imaging device is a cooled detector and a filter with a spectral response between about 3 μm and about 5 μm. At least one of the detector and the filter is cooled to between about −80° C. and about −200° C. The gas leak will be indicated on the notification device.