[Gasification] effect of steam on tar and soot production during pyrolysis?

Pannirselvam P.V pannirbr at gmail.com
Sun Aug 7 20:35:08 PDT 2011


 Dear Jim

   Both the pyrolyis and steam gasification  depends mostly  on the
temperture
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
parameters.

  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
temperatures .

    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
http://www.bgg.mek.dtu.dk/Publications.aspxot

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
same


  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
investments

       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
list

Welcome you to bring here the problems and the real isseu and I  am sure
 good way  will be shown by several experts

Yours truely
Pannirselvam P.V



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
> reduction.
>
> 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.
>
> j
>
>
>
>
>
> --
>
> ------------------------------------------------------------------------------
> Jim Mason
> Website: http://www.whatiamupto.com
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-- 
************************************************
P.V.PANNIRSELVAM
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
North East,Brazil
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