Generally speaking, H+SOE working principles are based on partial hydrogen pressure differences between the anode and cathode side (see Fig. \ref{437284}), which need to be forced to pass protons from the anode side to the cathode. Hydrogen partial pressure on the cathode side is very low (10-20 MPa) what results in voltage values with a single cell at level above 1.2 V.
This results in disintegrating of water molecule into oxygen and hydrogen, but hydrogen is transferred from steam reach stream into the other side of the solid electrolyte of the solid oxide electrolyser. By this way, we can generate quite pure hydrogen (at elevated temperature) and release oxygen into the steam cycle. Thus, we need to consider what influence of the additional oxygen in the steam cycle will influence and how to cool down and compress obtained hydrogen.
First issue, will be a corrosion caused by oxygen presence in steam, thus H+SOE shall be installed close to the deareator, or even integrated with it.