[Gasification] reducing temp. of gasification

Mon Oct 10 15:13:13 CDT 2011

Greetings, Jai, and list members.

Reducing tars in gas output, is really quite simple, design a gasifier
that works correctly for the desired feedstock is the main method,
however, you can also design a poorly built gasifier, and use many
cleaning filters after the gasifier, in the gas output pipes.

But really, one must understand what "tars" are, and at what internal
temperature the gasifier runs at, once this is known, then the design
can be re-designed to achive the correct temperature to reduce the
tars BEFORE they enter the gas output area.

In other words, generally 2 or more gasifiers must be built (or the
original one modified) to the point of acceptable level of tars within
the gas output.

Greg Manning
Canadian Gasifier Ltd.

On Mon, Oct 10, 2011 at 5:25 AM, jai balwanshi <jai764u at yahoo.com> wrote:
> sir can u tell me how i can reduce the tar in gasification in most simplest
> way?
>
> Jai Balwanshi
> Assistant Professor
> Mechanical Engineering Department
> VITS - Indore
> Contact No. 9713281992
>
> From: Viswanathan KS <viswanathanks at gmail.com>
> To: Discussion of biomass pyrolysis and gasification
> <gasification at lists.bioenergylists.org>
> Sent: Thursday, 6 October 2011 8:42 AM
> Subject: Re: [Gasification] reducing temp. of gasification
>
> Schoenen Dank and a Happy Dassera
>
> On Thu, Oct 6, 2011 at 8:31 AM, Anand Karve <adkarve at gmail.com> wrote:
>
> Dear Wishwanathan,
> we are still working on the idea. It works. We have been able to
> reduce the size of the digester to 1/3. Charcoal has to be enclosed in
> a net bag. It does float in the initial stages, but later it absorbs
> water and becomes heavy and sinks.
> Yours
> A.D.Karve
>
> On Thu, Oct 6, 2011 at 10:30 AM, Viswanathan KS <viswanathanks at gmail.com>
> wrote:
>> Dear Dr Karveji
>> Your designed digestor for kitchen waste has been popular. Can this
>> digestor
>> be made smaller and therefore cheaper and more affordable for households,
>> if
>> it is filled with charcoal?
>> Charcoal of which size is used and the quantity to be used?
>> Will charcoal not tend to float in the digestor?
>>
>>
>> On Wed, Oct 5, 2011 at 9:22 AM, Anand Karve <adkarve at gmail.com> wrote:
>>>
>>> Dear Henry,
>>>  There are a lot of very simple ideas that need to be tested.  I am
>>> currently working on increasing the efficiency of biogas digesters and
>>> feel that it might be possible to reduce the size and the capital
>>> expense of a biogas system. For instance, when I filled the digester
>>> with charcoal, my system accepted three times the normal daily input
>>> and produced three times as much gas.
>>> How much electrical energy would be required by the electric arc to
>>> produce producer gas? One can perhaps achieve the same temperature
>>> with paraboloid mirrors and sunlight.
>>> Yours
>>> A.D.Karve
>>>
>>> On Mon, Sep 12, 2011 at 5:52 AM, Energy7 <Energy7 at telusplanet.net> wrote:
>>> > Hi All
>>> > I Hope this is not a double post ( I posted this from my I phone
>>> > earlier
>>> > this morning and it has yet to show up )...
>>> >
>>> > Dear A.D. Karve
>>> > My exact thought a while ago was to achieve this temperature with an
>>> > internal electric arc furnace. The resulting gas can be put thru a
>>> > catalyst.
>>> > Just lately was reminded by a colleague of the efficiency of electro
>>> > static
>>> > precipitators and am presently researching their compatibility with
>>> > producer
>>> > gas.
>>> > So : air tight electric arc furnace fed with co2 and preheated feed
>>> > stock>
>>> > catalyst>98%cyclone cleaning>precip> final water filter cooling >dryer
>>> > >
>>> > co2
>>> > removal > o2 injection >ice>recycle hot co2 exhaust to preheat feed
>>> > stock.
>>> > Just an idea.. maybe too complicated? Please send me your ideas.
>>> > HN
>>> > ----- Original Message ----- From: "Anand Karve" <adkarve at gmail.com>
>>> > To: "Discussion of biomass pyrolysis and gasification"
>>> > <gasification at lists.bioenergylists.org>
>>> > Sent: Saturday, September 10, 2011 11:41 PM
>>> > Subject: [Gasification] reducing temp. of gasification
>>> >
>>> >
>>> >> Dear All,
>>> >> one requires about 700C temperature for making producer gas. This is
>>> >> generally achieved by burning the feedstock itself, for which one
>>> >> introduces external air into the reactor. As a result, the producer
>>> >> gas gets diluted by the nitrogen in the air. If the process can be
>>> >> conducted in a closed vessel, which is heated from the outside, one
>>> >> can get combustible gas without all the nitrogen, but heating the
>>> >> feedstock inside a container cannot achieve the temperature that is
>>> >> required for producing producer gas, so that what one gets is
>>> >> primarily tar vapour. Has anyone thought of using a catalyst for
>>> >> getting pyrolysis gas at say 300 C? It would help me greatly, if such
>>> >> a catalyst were available.
>>> >> Yours
>>> >> A.D.Karve
>>> >>
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>>> >>
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>>> >
>>> >
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>>>
>>>
>>>
>>> --
>>> ***
>>> Dr. A.D. Karve
>>> Trustee & Founder President, Appropriate Rural Technology Institute
>>> (ARTI)
>>>
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>>
>>
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>>
>
>
>
> --
> ***
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
> _______________________________________________
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>
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>
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>
>
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>
>

-- 
 Regards,

Greg Manning,
Brandon, Manitoba, Canada