[Gasification] effect of steam on tar and soot production during pyrolysis?
pannirbr at gmail.com
Sun Aug 7 20:35:08 PDT 2011
Both the pyrolyis and steam gasification depends mostly on the
the temperture higher than 1000 C , can accelerate more the water gas
shift reaction thus into more hydrogen and co2 , and alos the co2
decomposition leading to more C0 ,shifting the equilibrium leading to the
gas with less co2 . Thus steam reforming into hydogen rich syn gas is
favoured along with methan formation, less soot , tar production needing
less , air , thus less n2 in the the gas output
in this case of high temperture , pyrolyis is not limiting factor , but
steam reforming is critical.
Low temperature pyrolysis can lead to tar, char fines PAH, thus optium ,
not only the steam ,but also the the biomass:Air :steam are important
One of our research group project collaborator Dr.Rajessh has done ,
not experimental study , but modeling simulation and optimization of these
varibables as the Phd thesis .His email .is rajesh76 at gmail.com.he also has
more than international publications , he is presenetly working Pos doctrate
research regarding several vital question you have made here .
Even for us who make model , the role of steam in pyrolysis is not very
clear.The steam , it products , c02 , can bring down very rapidly the
pyrolysis temperature , then there is problem of maintain steady
In this respect , the two satge Denmak Viking gasifier has two stges
:pyrolysis , steam gasification pliot plant are very well demonstrated ,
in which the engine exhaust are used to maintain the tempertaure in
pyrlolysis as in GEK , the hot air and steam are recoverd from gasifier.
Surley there are experimental published work is available
Not only steam air ratio, but how this can be used are important points ,
realy we do not have answer.
if you wish to use steam in pyrolysis , this need to be the superheated one
, as superheated steam is well proved to be good for combustion , this can
help cracking Carbon carbon bonds, tars etc.
Experimental results are lacking but you can serach several patents,where
you can surely find the correct answer.
Opensource google , several sites make possible very quick search abou the
GeK gasifier design is ok , there is an good scope to do operacional
research to optimize , minimize fuel consumption , make goodquality gas ,
improve overall energy efficienmcy.Recent two piston ecomotors are under
fast developments which combined with GEK gasifier , operating like viking
well proven can make possible as practical small energy genertion with low
As you have open mind and open source ecobusiness model , making
money from biomass waste can be reality , an proven very soon , yet now
is an dream for many not an economicaly viable business, but technicaly
feasible as your well made GEK gasifier working demonstrated
Wish you all the sucess and thank you for your open minded sharing
information of technical information with our list, I am happy to see You
as an example and good model of other business venture bioenergy making
private company to share not only the problems , but also share several
important technical solution with open mind along with this list members,
eventhough top secret, stat of art technology one can keep awy from the
Welcome you to bring here the problems and the real isseu and I am sure
good way will be shown by several experts
On Sun, Aug 7, 2011 at 11:05 PM, jim mason <jim at allpowerlabs.org> wrote:
> on the road to reducing problems in the reactor so there are less
> issues to deal with in filtering, here's a new question.
> does anyone know where to look for experimental results on the impacts
> of increased steam in pyrolysis environments? my hunch is that
> increased steam will lessen the production of PAHs and general double
> carbon bonded refractory tars. we know we can do this by reducing
> pyrolysis temp and slowing the ramp rate, but will steam also help
> with this?
> the literature shows a marked decrease in soot production in
> combustion environments where there is high steam. steam apparently
> interrupts the agglomeration on the PAH nucleus. thus to the degree
> we can maintain adequate temps, steam is helping us with soot
> but what about during pyrolysis? does it reduce PAH production? do
> it have other marked effects on the type of tars make? in general,
> are there wins to be had with steam in pyrolysis that make things
> meaningfully easier to deal with downstream?
> i'm about at the end of what i can do on temp control during
> pyrolysis. i'm hoping there is another route to engage to continue
> improving the outputs of the pyrolysis stage.
> Jim Mason
> Website: http://www.whatiamupto.com
> Current Projects:
> - Gasifier Experimenters Kit (the GEK): http://www.gekgasifier.com
> - Escape from Berkeley alt fuels vehicle race:
> - ALL Power Labs on Twitter: http://twitter.com/allpowerlabs
> - Shipyard Announce list:
> Gasification mailing list
> to Send a Message to the list, use the email address
> Gasification at bioenergylists.org
> to UNSUBSCRIBE or Change your List Settings use the web page
> for more Gasifiers, News and Information see our web site:
ASSOCIATE . PROF.
Research Group ,GPEC, Coordinator
Computer aided Cost engineering
DEQ – Departamento de Engenharia Química
CT – Centro de Tecnologia / UFRN, Lagoa Nova – Natal/RN
Campus Universitário. CEP: 59.072-970
84 3215-3769 , Ramal 210
Home : 84 3217-1557
pvpa at msn.com
panruti2002 at yahoo.com
pannirbr at gmail.com
pvpa at msn.com
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Gasification