Investigation of processes in the "reformer-fuel cell" system by the mathematical modeling method

This study involved the creation of a mathematical model and the research of the ?reforming-fuel cell? system with the aim of obtaining optimal operating parameters for a solid oxide fuel cell. Based on the results of reforming system model?ling in ASPEN PLUS simulation software, the exergy efficiency of the reformer was calculated. The results were used to determine the optimal parameters for the steam conversion process of hydrocarbon fuels. Also, in the ANSYS software package, the technical parameters of the fuel cell operation were calculated: the temperature of the fuel cell at the outlet of the anode, the current density at the outlet of the fuel cell, as well as the composition of the exhaust gases. As a result of the study, technological parameters were calculated, which allow us to draw a conclusion about the influence of gas composition on the output parameters of the fuel cell. For various molar compositions of synthesis gas, the efficiency of the fuel cell, the temperature at the anode outlet, and the current density were calculated. Based on the simulation data obtained, it can be concluded that the most optimal temperature range for the steam conversion reactor operation will be between 1125-1200 K under conditions without a catalyst. This same range corresponds to the highest exergetic efficiency which was calculated for this reactor and amounted to 67.3%. Additionally, based on various gas compositions within this range, the calculation of the current density was performed, reaching a maximum value of 5000 A/m?. For the same range, the electric efficiency of the fuel cell was also calculated, with its maximum being 62.25%. According to the values of the exergetic efficiency of the reformer and the electrical efficiency of the fuel cell, the obtained calculations made it possible to conclude about the most optimal composition of the obtained synthesis gas.