Condensation-recovery device for overpressure gas based on liquefied natural gas (LNG) cold energy

A condensation-recovery device for overpressure gas, comprising:

• a tank body;
• and
• a primary condensation cavity;
• wherein an upper end of the tank body is connected with an outlet, and a lower end of the tank body is connected with an inlet;
• the primary condensation cavity is arranged at a bottom of the tank body, and an interior of the primary condensation cavity is configured to store a liquefied natural gas (LNG) to condense the overpressure gas comprising boil-off gas (BOG);
• the primary condensation cavity comprises a vertical hollow tube arranged in the tank body;
• a bottom of the vertical hollow tube is provided with an engagement mechanism;
• and a conical tube is fixedly arranged at a top of the vertical hollow tube, and the conical tube is communicated with the vertical hollow tube;
• and
• the engagement mechanism comprises a square block;
• the square block is fixedly connected with the bottom of the vertical hollow tube;
• an interior of the square block is hollow, and two sides of the square block are each provided with a through groove;
• an inner side of the through groove is provided with an enclosed slot;
• an end surface of the square block away from the vertical hollow tube is movably provided with a connecting tube;
• and two sides of the connecting tube corresponding to the enclosed slot are each fixedly provided with a closing plate, and two sides of the closing plate are each provided with a return spring.