By Energinet (Denmark)
The project aims at testing a blend of hydrogen and natural gas in the Danish network. Hydrogen will be injected up to 80 bar corresponding to transmission networks. It will be partly funded by external innovation fund.
Phase 1 was finalised in February 2020: long-term test of 12% hydrogen blend, and short-term test of
14% hydrogen blend were completed. Furthermore, no leakage of hydrogen was detected throughout the testing period. It has been decided to continue in a phase 2 where the aim is to test up to 25% blend of hydrogen in the closed loop system. The project partners for phase 1 are Energinet, EVIDA and the Danish Gas Technology Centre.
Technical aspects
- Blending up to 25% in a closed loop system between two M/R-stations (80/40 and 40/4 bar stations).
- A new connection has been built to return the gas to the high-pressure side.
- A compressor raises the pressure from 4 bar to 80 bar.
- The two M/R stations and connecting pipework are standard and have been in operation for about 30 years on natural gas.
Contribution to energy transition
This project will play a role in enabling Denmark to reach its objective of 100% renewable energy in 2050. To reach that target, it is indeed necessary to increase the focus on conversion between various energy sources and on storage of large quantities of renewable energy. M/R HELLE testing project will pave the way to the large-scale development of hydrogen in Denmark, allowing to store and transport surplus renewable electricity.
