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Re: [PSUBS-MAILIST] CO2 Scrubber
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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