Dear Jan
Very interesting!!
What steam temperature and pressure is required to gasify wood?
Once one has such gas, what sort processing is required to convert it to CH4?
(That is, what temperatures, pressures, catalysts, etc)
Is there any way this can be done on a small scale?
Is there any way this process can be modified to produce methanol on a small
scale? If so, this would be awesome... it would then yield a very portable
liquid fuel.
Thanks!
Kevin
----- Original Message -----
From: Jan Kopyscinski
To: Discussion of biomass pyrolysis and gasification
Sent: Tuesday, May 31, 2011 11:30 AM
Subject: Re: [Gasification] back to gasification
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" <[email protected]>
Gesendet: May 31, 2011 12:46:54 PM
An: "Discussion of biomass pyrolysis and gasification"
<[email protected]>
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 <[email protected]> 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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