| 摘要 |
<p>The procedure for separating a nitrogen-rich fraction from a liquefied natural gas comprises providing the natural gas after its liquefaction and super cooling, to a stripping column (S) that serves the separation of the nitrogen-rich fraction. A first partial stream of the natural gas (2, 2') is supplied to the stripping column as back flow during a second partial stream of the natural gas (3, 3') is provided into the sump of the stripping column. The second partial stream has a high temperature than the first partial stream. The procedure for separating a nitrogen-rich fraction from a liquefied natural gas comprises providing the natural gas after its liquefaction and super cooling, to a stripping column (S) that serves the separation of the nitrogen-rich fraction. A first partial stream of the natural gas (2, 2') is supplied to the stripping column as back flow during a second partial stream of the natural gas (3, 3') is provided into the sump of the stripping column. The second partial stream has a high temperature than the first partial stream and the temperature difference between the first and the second partial stream is 60-80[deg] C. The first partial stream has a gas content of more than 80 vol.%. The quantitative ratio between the first and the second partial stream is changeable. Methane- or nitrogen-rich stream (8, 11, 12) is additionally added to the second partial stream of the natural gas to the sump of the stripping column.</p> |
