Gas turbine system

A gas turbine system comprising:

• an ammonia tank;
• a combustor connected to the ammonia tank;
• an exhaust flow passage connected to the combustor;
• a turbine provided in the exhaust flow passage;
• a cracked-gas reservoir connected to the combustor;
• an ammonia cracking catalyst, which is arranged on a downstream side of the turbine in the exhaust flow passage, and is connected to the ammonia tank and the cracked-gas reservoir;
• and
• a controller,
• wherein the controller of the gas turbine system is configured to, during an operation of the gas turbine system, determine whether or not a temperature of the ammonia cracking catalyst has become equal to or higher than a reference temperature and, when the gas turbine system has determined that the temperature of the ammonia cracking catalyst has become equal to or higher than the reference temperature, control so that ammonia is supplied from the ammonia tank to the ammonia cracking catalyst, and
• wherein the controller of the gas turbine system is configured to, during an operation of the gas turbine system, (i) control a supply amount of ammonia from the ammonia tank to the ammonia cracking catalyst so that pressure in the cracked-gas reservoir becomes equal to a reference pressure, (ii) not stop the gas turbine system and continue supply of ammonia from the ammonia tank to the ammonia cracking catalyst when the pressure in the cracked-gas reservoir is lower than the reference pressure, and (iii) stop the gas turbine system when the pressure in the cracked-gas reservoir has become equal to or higher than the reference pressure, and
• wherein the controller of the gas turbine system is configured to, at the time of activation of the gas turbine system, control so that supply of ammonia from the ammonia tank to the combustor is started after supply of a cracked gas from the cracked-gas reservoir to the combustor is started.