REMOVAL OF SOUR GASES Jón Steinar Guðmundsson April 2013

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1 REMOVAL OF SOUR GASES Jón Steinar Guðmundsson April 2013
Acid gases must be removed to meet transport and sales gas specification of natural gas. Main natural gas gases are carbon dioxide and hydrogen sulphide. Acid gas contents in Norway are relatively low. Amine solutions are used to remove acid gases in an absorber-stripper plant. Treatment of natural gas is a well developed technology. Treatment of exhaust gas from power plants is expensive.

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3 Syregass (Acid gas) rensing (sweetening)
Mange alternativer for rensing Batch (lav mengder) Amin-vann løsninger Amin-løsemiddel-vann løsning (mixed solution) Fysisk løsemiddel (kaldt regenerering, simultan tørking) Direkte oksidering av sulfid til svovel Adsorpsjon (molekylsil) Membraner (veldig høy CO2 konsentrasjon) Merk at de fleste innebære vann løsninger, derfor kommer sweetening før tørking.

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5 Figur fra Rojey

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9 KOLONNETEORI (MASSEBALANSE)
Renset gass ute Svak amin inn Rik gass inn Rik amin ute

10 Absorpsjon Figur fra Kidnay

11 Aminer som brukes til absorpsjon
Tabell fra Rojey

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14 CO2-lagring i Utsiraformasjonen (fra Sleipner)

15 CO2-lagring i på Snøhvit

16 FJERNING AV CARBON DIOXIDE FRA EKSOSGASS FRA GASSKRAFTVERK

17 Summary Absorption the main technology used for removal of sour gases in Norway. Concentration of acid gases low. Amine solutions are used in contact towers and regenerated in stripper columns. Proprietary amine solutions. Energy usage important parameter in design of absorption processes (both heat and pumping). Removal of acid gases from natural gas well proven technology (absorption under pressure so size of tower not a big problem). Removal of carbon dioxide from power plant exhaust a challenge (absorption under near-atmospheric pressure so size of tower a big problem).

18 References Aker Kværner (2008): CO2 håntering fra krafgenerering til havs, 20 sider. Kocken Sistemas de Energia (2013): Dehydration, 1 p.