| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for depressurizing a gas hydrate in which a fine ice film is formed on a surface of the gas hydrate, even though the depressurization rate is comparative fast, when the gas hydrate is depressurized to atmospheric pressure from high pressure in a hydrate generating area. <P>SOLUTION: A gas hydrate 20 is depressurized at a high depressurization rate (for example, 5.4-0.15 MPa/min) up to a pressure in which the gas hydrate 20 cooled below freezing point reaches the hydrate generation parallel line. The gas hydrate 20 is depressurized at a low depressurization rate (for example, 0.06-0.01 MPa/min) in a hydrate decomposing area. <P>COPYRIGHT: (C)2012,JPO&INPIT |
