Thermodynamic performance study of the SOFC-STIG distributed energy system fueled by LNG with CO_2 recovery

摘要

The SOFC-STIG distributed energy system is a significant developing trend in the field of energy technology. The SOFC-STIG distributed energy system fueled by LNG with CO2 recovery is put forward in this paper. In the new system, the LNG's cold energy can not only supply cold energy, but also cool compressor inlet air to reduce consumption of compressor work and recovery liquid CO2. Based on each part's mathematical model, the new system's thermodynamic performance calculation model is built by FORTRAN. And with the help of the simulation tool ASPEN Plus, the simulation work was carried out at steady state using Peng-Robinson equation of state. The results of calculation indicate that the thermal efficiency and the power efficiency of this distributed energy system are 72.77% and 57.08% while the exergy efficiency can reach 61.9%. Furthermore, several important variables including fuel flow rate, steam injection ratio and fuel utilization factor are selected to analyze the system performance. (C) 2019 Elsevier Ltd. All rights reserved.