Refrigerating method and refrigerating system utilizing gas hydrate

A refrigerating system utilizing gas hydrate as a refrigerant and having a hydrate generating reactor, a cooler, a depressurizing unit, a hydrate decomposing system, a pump, and a compressor, comprising:

• a hydrate line constituted by connecting in order said hydrate generating system, said depressurizing unit, and said hydrate decomposing system to transfer the gas hydrate;
• a gas line constituted by connecting in order said hydrate decomposing system, said compressor, and said hydrate generating reactor to transfer gas components decomposed from the gas hydrate;
• a liquid line constituted by connecting in order said hydrate decomposing system, said pump, and said hydrate generating reactor to transfer liquid components decomposed from the gas hydrate;
• and
• a cooling line constituted by connecting in order said hydrate generating reactor, said cooler, and said hydrate generating reactor to cool and return a mixture solution or liquid components containing solids generated in the hydrate generating reactor;
• the system further comprising an additive feed line connecting the hydrate generating reactor and the liquid line to each other for mingling an additive separated by the hydrate generating reactor into the liquid components transferred via the liquid line.