| 摘要 |
A method for removing acidity and/or moisture from a hydrocarbon gas, in particular from a natural gas or a refinery gas fraction or a syngas, by absorption into a sweetening liquid and into a dehydration liquid, that are adapted to extract acid compounds or water from the gas, respectively. The method provides a step of prearranging a vertical elongated container (150) comprising at least one inner partition wall (168) that defines at least two treatment chambers within said container (151,152), a step of feeding a treatment liquid from the above into at least one of the two chambers (251,252) and feeding the gas to be treated from below into at least one same treatment chamber. It is also provided a step of selecting a treatment mode, wherein the gas flows along the two treatment chambers in a parallel or in a series arrangement, or one chamber being excluded; in particular the series-mode or the exclusion mode is actuated when the flowrate of the gas decreases below a minimum threshold value, while the parallel-mode is actuated when the flowrate of the gas rises above a maximum threshold value. An apparatus comprising at least such a container and a gas convey selective convey means (44′,44″), for actuating said treatment modes, in particular responsive to a flowrate of the gas. The apparatus and the method according to the invention allow to maintain the sweetening and/or dehydration efficiency, in particular in the case of a progressive reduction of the flowrate of natural gas that can be obtained from a well or gasfield. |
| 主权项 |
1. A method for removing a component from a hydrocarbon gas (1′,1″), in particular from a gas extracted from a gasfield or an oilfield, said component changing from an initial concentration to a treated gas concentration, said method comprising the steps of:
prearranging a vertical elongated container (150) comprising at least one substantially vertical inner partition wall (168) in said vertical elongated container, said at least one inner partition wall defining at least two treatment chambers within said container (151,152), each of said at least two treatment chambers having:
a respective first inlet port (171,181);a respective second inlet port (172,182);a respective first outlet port (173,183);a respective second outlet port (174,184), said first inlet port (171,181) and said second outlet port (174,184) arranged at an upper end of each treatment chamber (151,152), said first outlet port (173,183) and said second inlet port (172,182) arranged at a lower end each treatment chamber (151,152); feeding a treatment liquid (2′,2″) into at least one of said at least two treatment chambers (151,152) through said respective first inlet port (171,181), and extracting said treatment liquid as a used treatment liquid (3′,3″) through said respective first outlet port (173,183) of said at least one of said at least two treatment chambers (151,152); feeding said hydrocarbon gas (1′,1″) into said chamber of said at least two treatment chambers (151,152) through said respective second inlet port (172,182) and extracting said hydrocarbon gas as a treated gas (8′,8″) through said respective second outlet port (174,184) of said at least one of said at least two treatment chambers (151,152), wherein in said chamber of said at least two treatment chambers (151,152) said treatment liquid (2′,2″) comes into contact with said hydrocarbon gas (1′,1″), in order to receive said component from said hydrocarbon gas (1′,1″), said hydrocarbon gas (1′,1″) turned into a treated gas (5′,5″) in which said component has said treated gas concentration, selecting a treatment mode from the group consisting of:
a series-mode, wherein said hydrocarbon gas (1′,1″) flows along a first treatment chamber (151) and then along a second treatment chamber (152) of said at least two treatment chambers, and said treated gas is extracted only from said second treatment chamber (152);a parallel-mode, wherein said hydrocarbon gas (1′,1″) is directly fed into said first treatment chamber (151) and into said second treatment chamber (152), and portions of said treated gas are extracted from both said first and said second treatment chambers (151,152);an exclusion-mode wherein said treated gas is fed/extracted to/from a single treatment chamber selected from the group consisting of: said first treatment chamber (151) and said second treatment chamber (152), wherein said component to be removed is selected from the group consisting of:
an acid component, in particular H2S and CO2;water wherein a step is provided of compensating a mechanical deformation of said inner partition wall (168), said mechanical deformation due to a process condition difference between said first chamber (151) and said second chamber (152), in particular said mechanical deformation due to temperature and/or pressure differences between said first chamber (151) and said second chamber (152). |
