| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a liquefied carbonic acid gas recovery method allowing liquefied carbonic acid gas to be easily and surely recovered from a gas storage vessel in which liquefied carbonic acid gas for use in gas system fire-extinguishing equipment and the like.SOLUTION: There is provided the liquefied carbonic acid gas recovery method in which a gas storage vessel 1 storing liquefied carbonic acid gas is connected to a liquefied carbonic acid gas storage tank 2, a vessel valve 5 is opened, a differential pressure between a pressure in the gas storage vessel and a pressure in the liquefied carbonic acid gas storage tank is utilized to recover liquefied carbonic acid gas in the gas storage vessel into the liquefied carbonic acid gas storage tank, the vessel valve is closed at a point of time when the inside of the gas storage vessel and the inside of the liquefied carbonic acid gas storage tank show the same pressure, the gas storage vessel is separated from the liquefied carbonic acid gas storage tank and connected to a gas storage tank 3, the vessel valve is opened, a differential pressure between the pressure in the gas storage vessel and the pressure in the gas storage tank is utilized, gas remaining in the gas storage tank or residual gas having gas and liquefied carbonic acid gas mixed to each other is recovered into the gas storage tank, the gas storage vessel is separated at a point of time when the inside of the gas storage vessel and the inside of the liquefied carbonic acid gas storage tank show the same pressure, the residual gas recovered into the gas storage tank is pressurized and fed into the liquefied carbonic acid gas storage tank.</p> |
