Abstract
Ammonia is one of the prospective alternatives to hydrocarbon fuels. Currently, there are projects for developing of ammonia fired gas turbines up to 40 MW. The addition of thermochemical exhaust gas heat recuperation systems to ammonia-fired gas turbines could be a promising way to increase their efficiency. In this paper, the concept of an ammonia-fired chemically recuperated gas turbine (CRGT) is thermodynamically analyzed. Gas turbine with thermochemical recuperation by ammonia decomposition is analyzed via Aspen HYSYS for a wide range of operating parameters: turbine inlet temperature of 700–1300 °C, the pressure of 6–21 bar. The thermochemical exhaust heat recuperation system is recovering the exhaust heat in a reformer (for the endothermic reaction of ammonia decomposition), a heater (to preheat ammonia to the temperature of the decomposition reaction), and a regasifier (for regasification of liquid ammonia). The thermochemical exhaust heat recuperation system makes it possible to recover up to 43% of exhaust heat. The maximum efficiency of CRGT is observed at 9 bar for Tin = 700 °C; 12 bar at Tin = 800 °C; 15 bar at Tin = 900 °C; 18 bar at Tin = 1000 °C. In the temperature range above Tin > 1000 °C, when the pressure rises above 15 bar, the efficiency does not increase significantly.
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