Vätgassystem för reservkraft och reducering av effekttoppar

Sammanfattning: The scope of this study is to calculate the dimensions of a hydrogen storage system for Cytiva. The purpose of the system is to work as back-up power in case of a power outage and, if needed, help cut occasional power spikes. The system consists primarily of the electrolyser, fuel cell, storage tank and compressor. During night time when the electricity demand and price is low the electrolyser produces hydrogen gas and oxygen. The gas is compressed and stored in tanks. When the electrical power demand is high, the fuel cell converts the hydrogen gas to electricity, heat and water. Information and data regarding power demand and consumption was given by Cytiva. Our model simulations enabled us to develop three different scenarios. The purpose of Scenario 1 and scenario 2 is to be able to provide both back-up power and cut power spikes. The difference between them is the size of the storage tank, which influences how much the power spikes can be reduced. In scenario 3 the focus is to mainly provide back-up power for only a part of Cytiva’s site. This enables us to have a smaller system which would take up less space and be a lower investment cost. Our conclusion is that scenario 1 would be most suited for Cytiva’s needs. Scenario one means that both back-up power can be provided and the power spikes can be cut. The storage is smaller than in scenario 2, but our estimation is that it would be enough. If needed the system could also be expanded at a later stage.