Renewable hydrogen plays a central role in the energy transition. In Europe, member states are already experimenting with this energy carrier and investigating how existing natural gas distribution networks can be converted to supply hydrogen. As hydrogen is a highly flammable gas, technical staff working with hydrogen distribution networks must not only be trained, but also equipped with suitable tools. One of the most effective technologies for detecting hydrogen flames is the thermal imaging camera.
Hydrogen is considered crucial for the implementation of the European Green Deal and the transition to clean energy. It has a wide range of applications as a raw material, fuel or energy carrier and storage medium, for example in industry, transportation or the energy sector. Hydrogen is also particularly interesting for heating old buildings that are difficult to insulate and in which electric heat pumps would be inefficient.
Converting existing gas networks
The efficient distribution of hydrogen remains a challenge. The construction of new hydrogen infrastructures is costly, which is why solutions that convert existing natural gas networks for hydrogen are gaining in importance.
Demonstration projects that have already been carried out show that hydrogen can be integrated into existing gas networks with adaptations. Examples include:
- HyDeploy (Great Britain, 2020): Up to 20% hydrogen was added to the gas network at the University of Keele.
- H21 Leeds City Gate Report: The conversion of the British gas network to 100% hydrogen was confirmed as technically feasible and cost-efficient.
- Pilot project in Lochem (Netherlands, 2022): Twelve houses were heated with hydrogen transported via existing natural gas pipelines.
These projects demonstrate the growing interest in hydrogen distribution networks and their potential safety and efficiency.
Safety measures: Purging and flaring
When transitioning from natural gas to hydrogen, distribution pipes must be purged to remove natural gas and introduce hydrogen. Flaring - the controlled burning of excess hydrogen - is a common safety measure during maintenance work.
Hydrogen flames are almost invisible in daylight, so technicians must be trained and equipped with special tools to detect unexpected flame movement.
Thermal imaging cameras: the ideal tool for hydrogen safety
Thermal imaging cameras are essential to ensure safety when working with hydrogen. They can make invisible hydrogen flames visible through the thermal radiation they emit. Advantages of thermal imaging cameras:
- Improved situational awareness: they provide a visual representation of the scene, including hydrogen flares.
- Increased safety: technicians can monitor flames from a safe distance without having to approach the flame.
- Multiple applications: In addition to flame detection, they can also detect hotspots or overheating problems.
- Fewer false alarms: Thermal imaging cameras react less to non-flame sources such as sunlight or hot surfaces.
