[Gasification] Active charcoal

[Anand Karve]

Dear Darius,
if you want to char biomass, you must have a kiln for charring it. The
kilns are mainly of two types. In the oven and retort kiln, the biomass is
filled into a closed vessel which is heated from outside. The pyrolysis gas
escapes through a vent in the vessel, leaving the charred matter behind.
The renaissance painters used to make their charcoal sticks by using this
process. Also Yuri Yudkevich in Russia uses this type of a kiln for making
charcoal on a commercial scale. In the TLUD type of kin, which is generally
used by most others, the biomass is filled into the kiln, which is open at
the top and which also has holes in the bottom for allowing fresh air into
the kiln. The biomass is ignited from the top, so that the fire traverses
downwards. The air needed for maintaining the fire comes into the
kiln through the holes at the base of the kiln. It rises up and the oxygen
in the air is consumed by the burning biomass. Therefore this kiln is
called the Top Lit Up-Draft (TLUD) kiln.
Yours
A.D.Karve

On Mon, Feb 20, 2012 at 9:17 PM, darius tamizi <darius_tamizi at hotmail.com>wrote:

>  Dear Mr. Wu, Mr.Karve
>
> Thank you very much for the paper and explantion. I can undestand the
> theory, but I do not know how the apparatus looks like (exp. Oven with N2)
> and how can I do all the explanation without the apparatus. Could you help
> me more about it?
>
> Regards,
>
> Darius
>
>
>  ------------------------------
> Date: Mon, 20 Feb 2012 10:21:15 +0800
> From: adkarve at gmail.com
> To: gasification at lists.bioenergylists.org
> Subject: Re: [Gasification] Active charcoal
>
> Dear Darius,
>   Normally one needs relatively high temperature to make active charcoal,
> but the pretreatment with calcium chloride allows us to make active
> charcoal even at relatively low temperatures. We make charcoal from light
> biomass like agricultural waste and use a TLUD type kiln. You would have to
> conduct experiments using your biomass and your process of charring to see
> if this pretreatment works in your case or not.
> Yours
> A.D.Karve
> On Sat, Feb 18, 2012 at 11:01 PM, Darius <darius_tamizi at hotmail.com>wrote:
>
> Dear Dr. A.D. Karve
>
> Charring material are rubber wood.
>
> Could you tell me the detail process?
>
> Regards,
>
> Darius
>
> On 2/18/2012 9:56 PM, Anand Karve wrote:
>
> Dear Darius,
> what material are you charring? We make our charcoal from leaves of
> sugarcane, which are discarded during the process of sugarcane harvest. By
> soaking the leaves in 5% solution of calcium chloride, dying them and then
> converting them into char in a TLUD kiln gives us active charcoal. We have
> not tested this process in the case of woody material. Perhaps you can do
> this experiment.
> Yours
> A.D.Karve
> On Sat, Feb 18, 2012 at 10:14 PM, Darius <darius_tamizi at hotmail.com>wrote:
>
> Dear all,
>
> Is somebody  there can help me to convert our char into active charcoal?
>
> Regards,
>
> Darius
>
>
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
>
>
>
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> --
> ***
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
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-- 
***
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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