| 摘要 |
A method and an apparatus for removing acid compounds (sweetening) and moisture (dehydration) from a hydrocarbon gas, in particular from a natural gas or from a refinery gas fraction or a gas of synthesis, by subsequent absorption operations using a sweetening liquid and a dehydration liquid. The method comprises a step of prearranging a sweetening chamber (51) and a dehydration chamber (52) within a vertical elongated container (50), each chamber defined by an inner partition wall (68) of said vertical elongated container (50), is wherein a gas transfer passageway (14) is provided between an upper outlet port of the sweetening chamber (51) and an inlet port of the dehydration chamber (52); the method also comprises steps of feeding the absorption liquid from the above into the two chambers and of feeding the gas from below into the sweetening chamber. The apparatus and the method according to the invention make it possible to reduce the overall dimensions of the treatment unit with respect to the prior art units, which is particularly relevant for off-shore installations. |
| 主权项 |
1. A method for removing an acid compound and a moisture content from a hydrocarbon gas, said acid compound and said moisture changing from respective predetermined initial concentrations to respective treated gas concentrations, wherein said acid compound comprises H2S, and an initial concentration of said H2S is higher than 10 ppm by weight, said method comprising the steps of:
prearranging a vertical elongated container having a dimension ratio between a height size and a transversal size and comprising a sweetening chamber and a dehydration chamber, said sweetening chamber separated from said dehydration chamber by a substantially vertical inner partition wall of said vertical elongated container, said inner partition wall extending in a substantially vertical way within said vertical elongated container, wherein: said sweetening chamber has a first and a second inlet port, and a first and a second outlet port, said first inlet port and said second outlet port arranged at an upper end of said sweetening chamber, said first outlet port and said second inlet port arranged at a lower end of said sweetening chamber; said dehydration chamber has a third and a fourth inlet port, and a third and a fourth outlet port, said third inlet port and said fourth outlet port arranged at an upper end of said dehydration chamber, said third outlet port and said fourth inlet port arranged at a lower end of said dehydration chamber; a gas transfer passageway is provided between said second outlet port of said sweetening chamber and said fourth inlet port of said dehydration chamber; feeding a sweetening liquid through said first inlet port of said sweetening chamber, and extracting said sweetening liquid as a used sweetening liquid through said first outlet port of said sweetening chamber; feeding a dehydration liquid through said third inlet port of said dehydration chamber, and extracting said dehydration liquid as a used dehydration liquid through said third outlet port of said dehydration chamber; feeding said hydrocarbon gas through said second inlet port of said sweetening chamber, and extracting said hydrocarbon gas as a dry sweetened gas through said fourth outlet port of said dehydration chamber, in said sweetening chamber, said sweetening liquid entraining said hydrocarbon gas, such that said sweetening liquid withdraws said acid compound from said hydrocarbon gas, said hydrocarbon gas turning into a sweetened gas in which said acid compound has said respective treated gas concentration, in said dehydration chamber, said dehydration liquid entraining said sweetened gas, which comes from said sweetening chamber through said gas transfer passageway, such that said dehydration liquid withdraws moisture from said sweetened gas, said sweetened gas turning into a dry sweetened gas wherein, in said sweetened gas, said moisture has said respective treated gas concentration, wherein said dimension ratio is higher than 7. |
