Gas turbine facility and method for suppressing discharge of ammonia from gas turbine facility

A combustion system comprising:

• a combustion device configured to burn ammonia as fuel;
• an ammonia supply device configured to supply the ammonia as the fuel to the combustion device;
• a suppressing discharge of ammonia unit including a sprinkling device, the suppressing discharge of ammonia unit being configured to recover as ammonia water the ammonia in exhaust from the combustion device by sprinkling the exhaust with plain water from the sprinkling device at start-up of the combustion system, and then by sprinkling the exhaust with ammonia water from the sprinkling device to suppress the ammonia from being discharged outside the combustion system;
• and
• a control device configured to control an operation of the sprinkling device in association with the supply of the ammonia to the combustion device.