A gas capture system includes a first heat exchanger that exchanges heat between cold heat of a fuel that is vaporizing and a first gas mixture to cool the first gas mixture, a first dehumidifier that dehumidifies the first gas mixture cooled through the first heat exchanger, a first compressor that presses the first gas mixture passing through the first dehumidifier, a first separation device that separates a second gas mixture including a reference gas from the pressed first gas mixture, and a liquefier that liquefies the reference gas to generate a reference liquid.

A gravitational vapor compressor device includes at least one vertical compression chamber and a plurality of droplet spray generating nozzles are arranged at the top thereof, which nozzles form a flow of droplets in the water vapor flow along a height h1 of the vertical shell. The speed of the droplets from the droplet beams is adjusted along the height h1 to the terminal fall velocity in relation to a gas flow, the compression chamber has a height h2 from which droplets fall at the same or similar terminal velocity inside a water vapor flow, which compresses the water vapor. The gravitational vapor compressor device further comprises a secondary vapor outlet duct.