[Gasification] Gasification Digest, Vol 4, Issue 23

Sat Oct 28 20:23:19 CDT 2006

There is a method I used, to dry Cashew nut and Coconut meat for Virgin
Coconut oil.
Dry them on a metal sheet painted Black. And place it inside a plastic home
made wind tunnel. One side of the wind tunnel tapers up to become a chimney.
Other side is sloping down into a narrow opening. A table fan can be fitted
there to speed up air circulation, but I did not do it.
Black surface get hotter and the hot air escapes through the chimney with
that goes the moisture. The air current speeds up with the increasing height
of chimney. This is a much faster way than normal sun drying. Also this
would protect what we dry from birds and sqirrels etc.
In some areas people use a bit similar method to make dry fish.

There is another method, I just remembered. If you have long timber poles to
dry, less than 6' diameter or even 60mmX60mm timber, You can use the
parabolic reflectector method to sun dry it. This method is faster. Make a
medium size channel with timber supports. Channel must be of polished GI
Sheet or Aluminium sheets. Stainless steel sheet is the best.The cross
section is PARABOLIC.
Hang the timber pole at the Focal point of Parabola inside the channel with
a crank fitted to timber. So that you can turn it before one side becomes
charcoal. After drying you can cut the timber to what ever size you want.
Use protective eye glasses.

These two methods won't cost you money in the drying operation. Only the
free power of Sun. Some expenditure in initial setting up of stage at a
sunny spot.

Ananda
Sri Lanka & Philippines
Engr.Ananda S K Weerakkody
On 10/29/06, gasification-request at listserv.repp.org <
gasification-request at listserv.repp.org> wrote:
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> Today's Topics:
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>   1. Re chip drying (Toby Seiler)
>   2. Re: Wood chunks (Greg Manning)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 27 Oct 2006 15:50:57 -0700 (PDT)
> From: Toby Seiler <seilertechco at yahoo.com>
> Subject: [Gasification] Re chip drying
> To: gasification at listserv.repp.org
> Message-ID: <20061027225057.14251.qmail at web38213.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Adam;
>
> There is a good chip dryer at;
>
> http://www.koeb-schaefer.com/kus_tree/kus_content/powerslave,id,604,lang,EN,nodeid,98.html
>
> Toby J. Seiler
>
>
>
> gasification-request at listserv.repp.org wrote:
>
> Message: 6
> Date: Fri, 27 Oct 2006 16:49:04 +0100
> From: "Adam Carr, Renergy"
> Subject: [Gasification] Wood chunks
> To:
> Message-ID: <001e01c6f9df$6ec36440$0200a8c0 at adam>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Does anyone out there have any information re. the amount of time/energy
> and techniques/equipment required to dry wood 'chunks' of ~ 60X60mm @ ~50%
> Moisture Content down to <20% MC? Between 1 - 2 tonnes/hr.
>
> We have a market for the higher grade heat that the gasifier will produce,
> so would prefer to utilise lower grade (~90C) heat from the engine water
> cooling jacket.
>
> I envisage some sort of perforated/walking floor/fan arrangement, but have
> absolutely no idea how much energy/time would be required, or for that
> matter how much time would be needed to air dry the chunks at ambient.
> (under cover! - it has been raining a lot in Cornwall recently), or whether
> it might be an idea to air dry first and then use heat to finally get the
> chunks down to slightly below 20% MC?
>
> Adam Carr
> Renergy Ltd
>
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> End of Gasification Digest, Vol 4, Issue 22
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> Message: 2
> Date: Fri, 27 Oct 2006 22:01:18 -0500
> From: "Greg Manning" <a31ford at inetlink.ca>
> Subject: Re: [Gasification] Wood chunks
> To: "A Gasification" <gasification at listserv.repp.org>,  "Adam Carr,
>        Renergy" <adam.carr at renergy.org.uk>
> Message-ID: <GGEBLFNJNOGGJGNEDBJJKEPJLMAA.a31ford at inetlink.ca>
> Content-Type: text/plain;       charset="windows-1250"
>
>
> Greetings Adam, and list members.
>
>
> Adam, I would hope 50% is a "high side" guess, as this is basically "green
> fresh cut wood", given that, if this is green wood, the process of
> moisture
> moving out of the wood, is mostly a linear rate with temperature rise,
> until
> the temperature hits the low end of torrification (memory says about 285f,
> but I may stand to be corrected on that).
>
> The 285f mark, is the actual wood temp, NOT the surrounding air temp,
> therefore, the air (in the presence of wet wood) can be as high as 450f
> (again if memory is correct).
> at this rate, you are basically cooking steak (literally) as in, the
> evaporation rate from the wood is the same level as meat, only the meat
> will
> be under 50% MC.
>
> How long does it take to dry out a 2 1/4" thick roast to the point of
> "honey, it's dead" ! (cardboard steak) ?
>
> I would guess at 350f about 80 minutes or so. (450f with meat would burn
> to
> quick I think, BUT I'm not the cook in our home.....).
>
> Try this..... get some samples of your chunks.. weigh them to say one Kg
> (2.204 lbs.) set them on a old cookie sheet (or a chunk of tin or
> something
> that will not burn),
>
> Place the entire affair in your stove's oven that you preheated to say,
> 300f, note the time... every 10min, take the sheet and contents out and
> weigh them again (scale tare'd to 0 kg. with the sheet in place), keep
> repeating until the weight does not reduce, "ta-da", you have found two
> things... (remember to use oven mitts...)
>
> 1) The absolute Moisture Content (MC) of the test sample (1 kg, minus the
> final sample's weight, (eg: 0.8kg) this would mean that the water content
> was 0.2kg or 20% by weight).
>
> 2) and the time to get there.... (your answer to your initial question...)
> how long to dry the wood at a given temperature.
>
> Item one is what is called Bone dry, of course, you can reverse engineer
> the
> time after initial testing, and figure out your required level of 10-20
> %mc
> and the time required to get there.
>
> See my website on gasification:
> http://www.inetlink.ca/a31ford/cgcmb/
>
> Regards,
> Greg Manning,
>
> Brandon Manitoba, Canada
>
>
>
> -----Original Message-----
> From: gasification-bounces at listserv.repp.org
> [mailto:gasification-bounces at listserv.repp.org]On Behalf Of Adam Carr,
> Renergy
> Sent: Friday, October 27, 2006 10:49 AM
> To: gasification at listserv.repp.org
> Subject: [Gasification] Wood chunks
>
>
> Does anyone out there have any information re. the amount of time/energy
> and
> techniques/equipment required to dry wood 'chunks' of ~ 60X60mm @ ~50%
> Moisture Content down to <20% MC?  Between 1 - 2 tonnes/hr.
>
> We have a market for the higher grade heat that the gasifier will produce,
> so would prefer to utilise lower grade (~90C) heat from the engine water
> cooling jacket.
>
> I envisage some sort of perforated/walking floor/fan arrangement, but have
> absolutely no idea how much energy/time would be required, or for that
> matter how much time would be needed to air dry the chunks at ambient.
> (under cover! - it has been raining a lot in Cornwall recently), or
> whether
> it might be an idea to air dry first and then use heat to finally get the
> chunks down to slightly below 20% MC?
>
> Adam Carr
> Renergy Ltd
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> End of Gasification Digest, Vol 4, Issue 23
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>