International Gas Union Research Conference 2014 - TW2-3

摘要

The integration of green gases e.g. biogas, hydrogen or synthetic natural gas is an important task and precondition for a successful energy transition. It is especially challenging to inject green gases into the grid at the point of their production as this is often in rural areas with less sophisticated infrastructures. There are technical measures as recompression to higher-pressure tiers enabling the gas injection almost into every grid section but this solution demands both high technical and financial efforts. A very promising approach is the strategic use the existing grid buffer (storage capacity of a gas network and the use of the difference between upper and lower pressure limits). In distribution and regional transportation grids with maximum operational pressures above 1 bar, a strategic pressure driven operation may allow green gas injection without any additional measures also in challenging situation as summertime nights were the load is in most areas exceptionally low. This could be achieved by a pressure reduction preferably in the evening hours, when the load is high, to enable an uninterrupted green gas injection overnight accompanied with a pressure build up, when the load is low. In order to assess the opportunities of this approach properly, it is also important to understand the preconditions (as needed pressure swing, geometric grid volume, customer distribution etc.) which have to be fulfilled. These questions have been answered by a R&D project supported by a following up pilot application that is carried out for EWE Netz GmbH by DBI GUT. The R&D project shows the potential of the dynamic pressure control exemplarily for selected gas grids in the North of Germany. Within the project several lower and upper pressures limits for have been considered. Furthermore, distribution grids with different load situations (based on the connected customers e.g. domestic or industrial character) were selected to enable future extrapolation to larger areas. The pressure driven operation of gas networks is subject of a European R&D project of GERG, which is called "Dynamic Pressure Control". The kick-off took place in March 2014 under participation of EWE Netz and DBI GUT.