Effect of ammonia and hydrogen blends on the performance and emissions of an existing gas turbine unit

The effects of fuel blends comprising ammonia and hydrogen on the technical, economic, and environmental indicators of an existing gas turbine unit with 7.6 MW output power were investigated and analyzed. Four models, each with different fuel-blending options, were designed by Aspen HYSYS and Ansys (R) Chemkin Pro to analyze the technical and chemical processes. Based on the technical and CO2 emission values of each model developed in Aspen HYSYS, the focus was on Scenario 4 with ammonia and hydrogen co-firing. This scenario exhibited the highest electric efficiency and the lowest CO2 emissions but had higher costs for generated electricity compared to other scenarios. Economic evaluations of all scenarios provided a clear understanding of each fuel cost and Levelized Cost of Electricity (LCOE). Initially, scenario 2, with ammonia co-firing, appeared to be an attractive option for further implementation. However, detailed analyses of the combustion process in each model dramatically changed the final decision and provided a good reason to focus on hydrogen fuel, which significantly reduced NOx emissions. In conclusion, Scenario 3 with hydrogen co-firing demonstrated attractive performance and favorable combustion kinetics.