Re: [PSUBS-MAILIST] CO2 Scrubber

["Warrend Greenway" <dub@linuxmail.org>]

Great! I'll keep you posted on my progress. Good luck!

Warren.

> Thanks a lot Warren!
> 
> I will try it too.
> 
> Pierre
> 
> 
> 
> 
> >From: "Warrend Greenway" <dub@linuxmail.org>
> >Reply-To: personal_submersibles@psubs.org
> >To: personal_submersibles@psubs.org
> >Subject: Re: [PSUBS-MAILIST] CO2 Scrubber
> >Date: Mon, 06 Jan 2003 09:52:15 +0800
> >
> >Sure. Like I said, my tests aren't complete, so I don't know how well my 
> >specific design will work. But
> >here is what I do know: CO2 scrubbers work by passing air through 
> >granulated calcium hydroxide. There is
> >a reaction between the calcium hydroxide and the CO2 in the air. The 
> >by-products of this reaction are
> >calcium carbonate and water. It is pretty ovious how this simple chemistry 
> >works. The trick is that calcium
> >carbonate is what you start with when you make calcium hydroxide. You 
> >hydrate calcium carbonate (steam) to
> >get the calcium hydroxide. This means that the water in the filter canister 
> >can be heated by an element to
> >drive off the carbon from the calcium carbonate and produce CO2 and calcium 
> >hydroxide. The CO2 would need to
> >be vented during this recharging process. The basic scrubber will consist 
> >of a canister with two screens, one
> >on the top, and one on the bottom. Granulated calcium hydroxide is then 
> >lightly packed or "sandwiched" between
> >the two filters to hold the medium in place. Air is then circulated through 
> >the canister. In rebreathers the
> >air is forced to circulate with two one-way valves. (So it doesn't just 
> >stagnate somewhere along the line.) At
> >this point I should mention that calcium hydroxide is standard slaked or 
> >hydrated lime, available at any hardware
> >store for a few bucks a fifty pound sack. I am trying porous plastic for my 
> >scrubber filters, but you should be
> >able to use plastic or stainless screen as well. Oh, and you have to 
> >remember that you will still need to slowly
> >replenish the oxygen in your sub with oxygen or air from a scuba tank. You 
> >should be able to test you own designs
> >for cheap with PVC or ABS pipe and fittings for your local hardware store.
> >
> >Warren.
> >
> > > Hi Warren!
> > >
> > > My name is Pierre and I'm building a dry-ambient sub. I was planning to 
> >use
> > > a mouth-piece inside the sub but your mail about co2 scrubber raise my
> > > interest. I don't know anything about scrubbers but by the way you are
> > > talking about it, it sound pretty simple... Could you give me more 
> >details
> > > about the system?
> > >
> > > Thank you very much!
> > >
> > > Pierre Poulin
> > >
> > >
> > >
> > > >From: "Warrend Greenway" <dub@linuxmail.org>
> > > >Reply-To: personal_submersibles@psubs.org
> > > >To: personal_submersibles@psubs.org
> > > >Subject: [PSUBS-MAILIST] CO2 Scrubber
> > > >Date: Sun, 05 Jan 2003 06:03:33 +0800
> > > >
> > > I just picked up the parts for my "test" CO2 scrubber. It cost all of
> > > $12.00. Has anyone else already done this? It's a pretty cheap test, but 
> >any
> > > words of wisdom would be appreciated. I am using porous plastic for the
> > > filters, PVC caps for the canister. I am going to use my welder
> > > tanks and regulator to introduce a controlled flow of mixed gas. There 
> >will
> > > be electronic CO2 sensors on the inlet and outlet so I can monitor
> > > absorption rates. Filter medium will be slaked lime from the hardware 
> >store
> > > granulated. I obviously won't be able to electrically recharge this test
> > > scrubber...I'll know how it works as soon as I can assemble it!
> > > >
> > > >Warren.
> > > >--
> > >
> > >
> > > _________________________________________________________________
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