Patent ID: 8128741

Claim:
A gas dissolving apparatus comprising: a cylindrical tubular container having a side wall and ends walls closing both ends thereof for containing a gas and a liquid; an injection inlet for injecting, into the tubular container, a gas-liquid mixed fluid in which a gas is mixed with a liquid; and a liquid outlet for discharging the liquid in the tubular container outside, wherein: the tubular container is placed in an inclined posture such that a center axis of the tubular container is inclined at an angle of 10° to 40° to the horizon; an interface is formed between the gas and the liquid in the tubular container, the center of which is positioned substantially center in a lengthwise direction of the side wall of the tubular container, a portion of an inner space of the tubular container above the interface being a gas containing section, and a portion of the inner space on or below the interface being a liquid containing section; the injection inlet is provided at a level corresponding to, or lower than, the level of the interface; the liquid outlet is provided near a bottom of the liquid containing section; and the gas-liquid mixed fluid is injected into the tubular container to stir the gas and the liquid in the gas-liquid mixed fluid as well as the gas and the liquid in the tubular container so as to dissolve the gas into the liquid.