| 摘要 |
A gas chromatograph for analyzing natural gas, with a first separation column ( 6 ). A first detector ( 7 ) is provided following the first separation column, the first separation column and the first detector operable to separate or detect propane and higher hydrocarbons. A second separation column ( 8 ) and a second detector ( 9 ) following it are provided to separate or detect carbon dioxide and ethane. A third separation column ( 10 ) and a third detector ( 11 ) following it are provided to separate or detect nitrogen and methane. A controllable changeover device ( 12 ) is provided between the second separation column ( 8 ) and the third separation column ( 10 ) to discharge eluates following methane. The first, second and third separation columns ( 6, 8, 10 ) and the first, second and third detectors ( 7, 9, 11 ) are connected in series. At least the first and the second detectors ( 7, 9 ) are operable to detect a mixture of substances flowing through them in a non-destructive manner.
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