The initial simulation condition of

The initial simulation condition of system is shown in Table 2. In order to ensure the rationality of the comparisons of all the systems, the input fuel, the inlet air temperature of cathode and the active area of SOFC stack are the same among the three systems. The SOFC hybrid power systems have more units than the SOFC stack itself, the main parameters of the other units have been chosen as follows: the isentropic expansion efficiency of turbine is assumed as 80%, mechanical efficiency of the turbine and generator are 98%. The double pressure with reheat HRSG and ST system is used for these there systems; the inlet and outlet pressures of HP/ MP/LP steam turbine are 9.8 MPa/2.6 MPa/0.5 MPa and 3.2 MPa/ 0.5 MPa/0.0056 MPa, respectively, and the HP/MP/LP steam turbine
inlet temperatures are 540 C/540 C/305 C, respectively. The CO2
is compressed by 6 stages intercooled compressors and the
discharge pressure of CO2 is 8 MPa. Then it is cooled to 25 C again
after compression. The operating pressure of the cryogenic air
separation unit is 0.6 MPa, and the purity of oxygen is assumed as
100%.