Method and device for feeding liquefied carbon-dioxide gas into an aquifer deep underground

An apparatus for feeding liquefied carbon-dioxide into the ground, comprising:

• a device to pump up saline water, from a deep aquifer that is saturated with saline water, to aboveground in order to use the saline water as injection water,
• a high-pressure water-injection device that feeds injection water from an injection well into a deep aquifer,
• a low-frequency-pulse generating device that is provided between the high-pressure water-injection device and the injection well, and that applies pulsatile hydraulic pressure to the injection water,
• a device that applies pressure so as to feed liquefied carbon-dioxide, while maintaining said liquefied carbon-dioxide in a liquefied condition, from a storage tank into the injection well, and
• a fine-droplet creating device that is provided inside the injection well and that transforms the liquefied carbon-dioxide that has been fed into the injection well into fine droplets, comprising droplets having diameters in the range of 0.01 mm to 0.05 mm, and mixes the liquefied carbon-dioxide droplets with the injection water, thereby creating a mixture of those two liquids;
• and wherein said apparatus's fine-droplet creating device includes:
• a casing pipe into which the injection water is fed,
• an insertion pipe that is inserted into the casing pipe and into which the liquefied carbon-dioxide is fed, such that said insertion pipe is positioned to have a top end and a bottom end, and
• a rotatable cylinder that is mounted inside and toward the bottom of the insertion pipe, with said rotatable cylinder having inside itself multiple injection pipes that inject the liquefied carbon-dioxide diagonally downward.