[Gasification] back to gasification

Tue May 31 22:34:10 CDT 2011

Dear Jan,
we are already using biomethanation for easily digestible material.
Food waste is the best feedstock for that process and because food
waste is plentifully available in the cities through restaurants,
vegetable and fruit markets, bakeries etc. we have specialised in
providing urban households with biogas plants. But agriculture
consists mainly of woody material, which is digested neither by
animals nor by humans. In the case of such a feedstock, we use the
ordinary process of gasification, filter out the tar, and use the
cleaned gas as fuel in an internal combustion engine. Using this
process, we operate an electricity generaor for providing electricity
to about 35 households situated in a mountainous area. Burning the
agrowaste for producing steam under high pressure and then to run a
steam turbine on it, is already being used by all sugar factories in
India but the machinery available in India is meant for generating a
minimum of 0.5 megawatts. It is not suitable for providing lights to
35 households.
Yours
A.D.Karve

On Tue, May 31, 2011 at 10:30 PM, Jan Kopyscinski <jan.kopy at web.de> wrote:
>
> Hi,
>
> First of all, there are at least two different types of biofuel:
> First Generation:  agricultural feedstock, which is converted by means of
> biochemical processes (i.e., digestion) --> Biogas
> Second Generation: woody biomass that is converted via thermochemical
> converiosn into a producer or so-calles syngas (Gasification).
> Thus, if your goal is to produce Methan or Natural Gas substite for a gas
> engine or transportation fuel you have different options. But you need to
> know what is your feedstock (dry , wet, digestable or not digestable such as
> wood):
> If you have a rather dry feedstock you can go for steam gasifiaction (no
> air, means no Nitrogen). The produced syngas you can catalytilcally convert
> to CH4, CO2 and H2O. Prior to the methanation process you need to remove the
> sulphur since it is deactivating your catalyts. H2O and CO2 can then be
> removed. This process has been investiaget by the Paul Scherrer Institiute
> in Switzerland (www.psi.ch and www.bio-sng.com).
> Removal of nitrogen is too expensive, thus you should avoid feeding it into
> your process. 2 vol% to max 5vol% N2 in the methan rich gas is acceptable.
>
> Regards,
>
> Jan
>
> ________________________________
> Von: "Pannirselvam P.V" <pannirbr at gmail.com>
> Gesendet: May 31, 2011 12:46:54 PM
> An: "Discussion of biomass pyrolysis and gasification"
> <gasification at lists.bioenergylists.org>
> Betreff: Re: [Gasification] back to gasification
>
> Dear A.D Karve
>
>       One of the project we have been studying  is based on the
>  IGT,Instuite  Gas technology patented process  called Biotherm , in which
> the  wood  gas or syngqs  can be passed into the biodigestor, in which  CO
> and  Hydrogen can  be converted into  methane ; the  NOX .COX, SOX removed
> via simple  known wet or  dry process using activated charcoal and  lime ;
> the methane is then compressed.The N  can be removed  as ammonia,as this can
> be very toxic to bio methane bacteria; Syngas obtained via pyrogas can
> reduce this N2 problem and complexity.Thus pyrogas technology  has more
> potential than  wood gas technology
>
>   we are studying how to make this complex process into simple innovative
> process to  make possible charcoal and  methane economy which is practiced
>  in the developed country  in big scale  can be  made possible in developing
> village level technology too in small scale ,The project is yet in design
> stage to reduce CO2 to use as liquid  fertilizer too increasing the
> calorific valued the compressed biogas.
>
> Yours truely
> Pannirselvam
>
>
>
> On Mon, May 30, 2011 at 11:01 PM, Anand Karve <adkarve at gmail.com> wrote:
>>
>> Dear List,
>> We are already using, in India, wood gas made from agricultural waste
>> to run stationary internal combustion engines. But, for using it as
>> automobile fuel, it would have to be filled into cylinders, for which
>> the nitrogen in the wood gas would have to be removed in order to
>> reduce its bulk and to increase its calorfiic value. Does anybody have
>> a suggestion as to how this can be achieved?
>> Yours
>> A.D.Karve
>>
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>
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Dr. A.D. Karve
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