Fuel supply system for eco-friendly ship

A fuel supply system for eco-friendly ships, comprising:

• an engine;
• a fuel storage tank storing a first fuel to be supplied as fuel to the engine;
• an ammonia storage tank storing ammonia to be supplied as fuel to the engine, wherein the engine is configured to consume one selected from among the first fuel and the ammonia or a fuel mixture of the first fuel and the ammonia;
• a selective catalytic reduction (SCR) device disposed on an exhaust line through which exhaust gas discharged from the engine passes, wherein the ammonia stored in the ammonia storage tank is supplied selectively or simultaneously to the engine and the SCR device;
• a first supply line along which the first fuel is supplied from the fuel storage tank to the engine;
• a second supply line along which the ammonia is supplied from the ammonia storage tank to the engine;
• a third supply line along which the ammonia is supplied from the ammonia storage tank to the SCR device, wherein the ammonia serves as a fuel for the engine when supplied along the second supply line and serves as a reducing agent for the SCR device when supplied along the third supply line;
• a greenhouse gas analyzer disposed on the exhaust line downstream of the engine and detecting greenhouse gases contained in the exhaust gas;
• and
• an NOx analyzer disposed on the exhaust line downstream of the engine and detecting nitrogen oxides contained in the exhaust gas discharged from the engine,
• wherein supply of the first fuel along the first supply line and supply of the ammonia along the second supply line are controlled based on values detected by the greenhouse gas analyzer,
• wherein supply of the ammonia along the third supply line is controlled based on values detected by the NOx analyzer.