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dpack
Joined: 02 Jul 2005 Posts: 45468 Location: yes
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oldish chris
Joined: 14 Jun 2006 Posts: 4148 Location: Comfortably Wet Southport
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Barefoot Andrew Downsizer Moderator
Joined: 21 Mar 2007 Posts: 22780 Location: In the 17th century
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oldish chris
Joined: 14 Jun 2006 Posts: 4148 Location: Comfortably Wet Southport
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Shane
Joined: 31 Oct 2005 Posts: 3467 Location: Doha. Is hot.
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15578
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dpack
Joined: 02 Jul 2005 Posts: 45468 Location: yes
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Shane
Joined: 31 Oct 2005 Posts: 3467 Location: Doha. Is hot.
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Posted: Sun Jan 04, 15 9:50 am Post subject: |
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dpack wrote: |
iirc oil derived h2s is the source material for the world's oversupply of sulfur |
Indeed - some of the Khazak fields are 30%+ H2S. There are pictures out there of the Khazak sulphur mountains. There's one on Kharg Island in Iran that can be seen quite easily if you get access to the right satellite photos, too.
dpack wrote: |
another place h2s is extra nasty is industrial pig units with the slurry under the floor,bugs make h2s ,h2s rots the electrics,spark ignites h2s and causes flashover to the straw ,resulting in roast pork in bulk. |
You can get it in pits full of seawater, too, as the bugs that produce it are present in seawater and there's plenty of sulphates to reduce to H2S. Never get tempted to go into any pit full of stagnant seawater, as you may well not come out again. Fortunately, there's not too many of them in the UK.
Apologies for the slow response - been slumming it in Mauritius for a couple of weeks |
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15578
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oldish chris
Joined: 14 Jun 2006 Posts: 4148 Location: Comfortably Wet Southport
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Shane
Joined: 31 Oct 2005 Posts: 3467 Location: Doha. Is hot.
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Shane
Joined: 31 Oct 2005 Posts: 3467 Location: Doha. Is hot.
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Posted: Mon Jan 05, 15 5:27 am Post subject: |
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Mistress Rose wrote: |
Nice for some.
How do you get the hydrogen sulphide out of the oil, or is that not your problem? |
It is exactly my problem, given that I design the equipment that does it!
Getting it out of the oil is easy - you just drop the pressure and it gases off with all the methane / ethane / propane / CO2. Getting it out of the gas afterwards, however, is another kettle of fish. It's normally done by using either media beds (think industrial-sized water filter cartridges), membranes or a recirculating amine solution, but all these processes need a lot of real estate and energy, and produce a nasty, nasty waste gas stream (that is normally burnt, as it's better to emit SO2 than H2S, even if Scandinavia's pine forests might not agree). If anyone's really, really interested I can give more details. |
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Mistress Rose
Joined: 21 Jul 2011 Posts: 15578
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Shane
Joined: 31 Oct 2005 Posts: 3467 Location: Doha. Is hot.
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Posted: Mon Jan 05, 15 10:48 am Post subject: |
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We are as strict on our facilities out here as we would be in the UK sector.
In the UK, you are required to show that your are using Best Available Techniques (BAT) and Best Environmental Practice (BEP). The suffix NEEC (Not Entailing Excessive Cost) has now been dropped, but still applies. When it comes to H2S, for a given production rate of oil or gas you have a given amount of sulphur that has to be removed from the process, and the only way to get rid of that on an industrial scale is to burn it (and produce SO2) or turn it into solid sulphur and stockpile it somewhere. The solids route isn't practical for many developments as there's only a limited market for it and any reasonably-sized, reasonably-sour project will generate huge quantities (a back-of-an-envelope calculation shows that a 200,000 barrel/day oil field with an H2S concentration of 500 parts per million will produce around 12 tonnes of H2S every day, so you can imagine how much you'd produce over 25 years of field life!).
Anyway, the summary is that as long as you minimise overall emissions of gas to atmosphere, the UK regulator will generally allow you to burn all of your sulphur, as the only alternatives are to build mountains of it onshore in the UK (imagine the outcry!), ship it to another country and pile it up there, or cancel the whole project. |
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Nick
Joined: 02 Nov 2004 Posts: 34535 Location: Hereford
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