Abstract
For the SOFC/GT combined cycle system where the preheater is arranged behind the turbine, the thermodynamic model is used to describe the compressor, turbine, and preheater, and the zero-dimensional model is used to describe the fuel cell. The performances of the low-temperature fuel cell combined cycle system and the medium-temperature fuel cell combined cycle system are studied. The results show that the medium-temperature fuel cell system has higher power and efficiency, because the efficiency of SOFC is higher than that of gas turbines under most operating conditions. Increasing, power and efficiency tend to decrease. The increase of fuel utilization rate leads to an increase in the overall efficiency of the system. The higher the fuel utilization rate, the more obviously the cycle efficiency is affected by the SOFC, and the faster the decline with the increase of fuel. When the fuel consumption is high and the current density of the SOFC is high, low cell fuel utilization is beneficial to cycle efficiency.
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