So in essence you are multiplying your surface area by using the internal surfaces of the Charcoal which is a structure similar to a sponge. What size charcoal are you using?<br><br><div class="gmail_quote">On Wed, Oct 5, 2011 at 9:01 PM, Anand Karve <span dir="ltr"><<a href="mailto:adkarve@gmail.com">adkarve@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Dear Wishwanathan,<br>
we are still working on the idea. It works. We have been able to<br>
reduce the size of the digester to 1/3. Charcoal has to be enclosed in<br>
a net bag. It does float in the initial stages, but later it absorbs<br>
water and becomes heavy and sinks.<br>
Yours<br>
A.D.Karve<br>
<div><div></div><div class="h5"><br>
On Thu, Oct 6, 2011 at 10:30 AM, Viswanathan KS <<a href="mailto:viswanathanks@gmail.com">viswanathanks@gmail.com</a>> wrote:<br>
> Dear Dr Karveji<br>
> Your designed digestor for kitchen waste has been popular. Can this digestor<br>
> be made smaller and therefore cheaper and more affordable for households, if<br>
> it is filled with charcoal?<br>
> Charcoal of which size is used and the quantity to be used?<br>
> Will charcoal not tend to float in the digestor?<br>
><br>
><br>
> On Wed, Oct 5, 2011 at 9:22 AM, Anand Karve <<a href="mailto:adkarve@gmail.com">adkarve@gmail.com</a>> wrote:<br>
>><br>
>> Dear Henry,<br>
>> There are a lot of very simple ideas that need to be tested. I am<br>
>> currently working on increasing the efficiency of biogas digesters and<br>
>> feel that it might be possible to reduce the size and the capital<br>
>> expense of a biogas system. For instance, when I filled the digester<br>
>> with charcoal, my system accepted three times the normal daily input<br>
>> and produced three times as much gas.<br>
>> How much electrical energy would be required by the electric arc to<br>
>> produce producer gas? One can perhaps achieve the same temperature<br>
>> with paraboloid mirrors and sunlight.<br>
>> Yours<br>
>> A.D.Karve<br>
>><br>
>> On Mon, Sep 12, 2011 at 5:52 AM, Energy7 <<a href="mailto:Energy7@telusplanet.net">Energy7@telusplanet.net</a>> wrote:<br>
>> > Hi All<br>
>> > I Hope this is not a double post ( I posted this from my I phone earlier<br>
>> > this morning and it has yet to show up )...<br>
>> ><br>
>> > Dear A.D. Karve<br>
>> > My exact thought a while ago was to achieve this temperature with an<br>
>> > internal electric arc furnace. The resulting gas can be put thru a<br>
>> > catalyst.<br>
>> > Just lately was reminded by a colleague of the efficiency of electro<br>
>> > static<br>
>> > precipitators and am presently researching their compatibility with<br>
>> > producer<br>
>> > gas.<br>
>> > So : air tight electric arc furnace fed with co2 and preheated feed<br>
>> > stock><br>
>> > catalyst>98%cyclone cleaning>precip> final water filter cooling >dryer ><br>
>> > co2<br>
>> > removal > o2 injection >ice>recycle hot co2 exhaust to preheat feed<br>
>> > stock.<br>
>> > Just an idea.. maybe too complicated? Please send me your ideas.<br>
>> > HN<br>
>> > ----- Original Message ----- From: "Anand Karve" <<a href="mailto:adkarve@gmail.com">adkarve@gmail.com</a>><br>
>> > To: "Discussion of biomass pyrolysis and gasification"<br>
>> > <<a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a>><br>
>> > Sent: Saturday, September 10, 2011 11:41 PM<br>
>> > Subject: [Gasification] reducing temp. of gasification<br>
>> ><br>
>> ><br>
>> >> Dear All,<br>
>> >> one requires about 700C temperature for making producer gas. This is<br>
>> >> generally achieved by burning the feedstock itself, for which one<br>
>> >> introduces external air into the reactor. As a result, the producer<br>
>> >> gas gets diluted by the nitrogen in the air. If the process can be<br>
>> >> conducted in a closed vessel, which is heated from the outside, one<br>
>> >> can get combustible gas without all the nitrogen, but heating the<br>
>> >> feedstock inside a container cannot achieve the temperature that is<br>
>> >> required for producing producer gas, so that what one gets is<br>
>> >> primarily tar vapour. Has anyone thought of using a catalyst for<br>
>> >> getting pyrolysis gas at say 300 C? It would help me greatly, if such<br>
>> >> a catalyst were available.<br>
>> >> Yours<br>
>> >> A.D.Karve<br>
>> >><br>
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>> --<br>
>> ***<br>
>> Dr. A.D. Karve<br>
>> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)<br>
>><br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><span style="font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height:15px">"A liberal is someone who feels a great debt to his fellow man, which debt he proposes to repay with your money."</span><div>
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