Ammonia engine system

An ammonia engine system, comprising:

• a combustor configured to generate combustion gas by burning ammonia mixed with air;
• a reformer into which the combustion gas generated in the combustor is introduced;
• a reforming catalyst arranged in the reformer, the reforming catalyst being configured to be warmed up by the combustion gas;
• an ammonia engine configured to be supplied with hydrogen that is discharged from the reforming catalyst;
• an intake passage configured to introduce air into the ammonia engine;
• a first air passage having a first end that introduces the air and a second end connected to the reformer;
• a first injector configured to inject ammonia gas into the first air passage;
• a second air passage having a first end and a second end, the first end of the second air passage being connected to the first air passage at a position upstream of the first injector, and the second end of the second air passage being connected to the reformer;
• a second injector configured to supply the ammonia gas to the combustor through the second air passage;
• and
• a controller configured to, during startup of the ammonia engine, execute:
• a combustion process that causes the combustor to generate the combustion gas by causing the second injector to inject the ammonia gas;
• and
• a supplying process that supplies the reforming catalyst with ammonia together with air in the reformer by causing the first injector to inject the ammonia gas, wherein
• the controller is configured to initiate the supplying process after warm-up of the reforming catalyst has been started by initiating the combustion process.