The operating pressure is another k

The operating pressure is another key parameter that influences the system performance. Improving the operating pressure of SOFC stack will make the SOFC voltage increase due to the increase of the H2 amount and H2 partial pressure. Finally the SOFC output power also increases. In addition, the higher operating pressure is also beneficial to increasing the output power of the gas turbine and steam turbine.
As shown in Fig. 10, as the operating pressure increases, the exergy loss of SOFC stack reduces and the total system output exergy increases. The system efficiency increases, meanwhile the exergy destruction coefficient reduces. However, the growth rate of the system efficiency becomes less and less with the increase of the operating pressure. In addition, the higher pressure will result in the increase of system investment. So it is necessary to choose the
proper operating pressure when designing the SOFC hybrid power system.