Thermodynamic Analysis of a Regenerative Brayton Cycle Using H2, CH4 and H2/CH4 Blends as Fuel

Considering a simple regenerative Brayton cycle, the impact of using different fuel blends containing variable volumetric percentage hydrogen in methane was analysed. Due to potential combustion gas turbines reduce overall CO2 emissions and dependency on natural gas, further research is needed understand thermodynamic cycle. For that purpose, qualitative analysis carried out assess exergetic energetic efficiencies cycle as well irreversibilities associated subsystem. A single step reaction considered hypothesis complete generic H2/CH4 mixture, where H2 represented by fH2, which varied from 0 1, defining amount mixture. Energy entropy balances were solved through Engineering Equation Solver (EES) code. Results showed global increased 5% 2%, respectively, varying fH2 1. Higher percentages resulted lower exergy destruction chamber despite higher air-excess levels. It also observed values led mass flow rates chamber, showing can still be competitive even though its cost per unit twice gas.