Influence of ORC working fluids on the efficiency of a combined system integrated with fuel cell, gas turbine, organic Rankine cycle and steam turbine

Abstract

The paper analyzes the influence of working fluids on the efficiency of the combined system integrated with solid oxide fuel cell (SOFC), gas turbine (GT), organic Rankine cycle (ORC) and steam turbine. Based on the mathematical model under the same heat source conditions and defined limit conditions, the analysis and comparison of the obtained values of efficiency and losses of individual cycles and the complete combined system for ORC working fluids m-xylene, toluene and MDM (OMTS) was performed. Pre-selected working fluids for the use of heat generated in SOFC and GT after the work is performed must meet environmental, safety and thermodynamic criteria. A comparative analysis of the obtained results of losses and efficiency will show which of the pre - selected working fluids under the same operating conditions has the greatest impact on the efficiency of the ORC and the combined system SOFC - GT - ORC - PT. The obtained results of individual efficiencies of SOFC, GT, ORC and PT will be the basis for determining the percentage increase in efficiency of quadruple combined system compared to stand-alone SOFC, hybrid SOFC-GT and triple combined system SOFC-GT-PT, for ORC with all three working fluid.