System for circulating air through double pipes for supplying gas and air circulation method using same

A method of circulating air through a double-walled gas supply pipe, comprising:

• supplying, by an air supply unit, air to an outer pipe of the double-walled gas supply pipe;
• suctioning, by an air ejector, the air in the outer pipe toward an air discharge line through introduction of high-pressure air into the air ejector;
• discharging the air introduced into the air ejector through a second discharge line;
• and
• circulating the air discharged through the second discharge line to the outer pipe,
• wherein air circulation to the outer pipe is achieved without additional air supply from the air supply unit by circulating the air introduced into the air ejector and having been discharged through the second discharge line to the outer pipe.

A method of circulating air through a double-walled gas supply pipe, comprising:

• supplying, by an air supply unit, air to an outer pipe of the double-walled gas supply pipe;
• suctioning, by a steam ejector, the air in the outer pipe toward an air discharge line through introduction of high-pressure steam into the steam ejector;
• and
• discharging the steam introduced into the steam ejector,
• wherein, under normal circumstances, the steam introduced into the steam ejector is discharged to a condensate water circulation line and, upon occurrence of gas leakage into the outer pipe, the steam introduced into the steam ejector is discharged together with the leaked gas to an outside of a ship employing the method through a third discharge line.