Dear Jim<div><br></div><div> Both the pyrolyis and steam gasification depends mostly on the temperture</div><div>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 </div>
<div><br></div><div> in this case of high temperture , pyrolyis is not limiting factor , but steam reforming is critical.</div><div><br></div><div>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.</div>
<div><br></div><div> 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@gmail.com.he also has more than international publications , he is presenetly working Pos doctrate research regarding several vital question you have made here .</div>
<div><br></div><div> 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 .</div>
<div><br></div><div> 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 </div>
<div><a href="http://www.bgg.mek.dtu.dk/Publications.aspx">http://www.bgg.mek.dtu.dk/Publications.aspx</a>ot </div><div><br></div><div>Not only steam air ratio, but how this can be used are important points , realy we do not have answer.</div>
<div><br></div><div>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.</div>
<div><br></div><div>Experimental results are lacking but you can serach several patents,where you can surely find the correct answer.</div><div><br></div><div>Opensource google , several sites make possible very quick search abou the same </div>
<div><br></div><div><br></div><div> 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 </div>
<div><br></div><div> 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</div>
<div><br></div><div> 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</div>
<div><br></div><div>Welcome you to bring here the problems and the real isseu and I am sure good way will be shown by several experts </div><div><br></div><div>Yours truely </div><div>Pannirselvam P.V</div><div><br></div>
<div><br><br><div class="gmail_quote">On Sun, Aug 7, 2011 at 11:05 PM, jim mason <span dir="ltr"><<a href="mailto:jim@allpowerlabs.org">jim@allpowerlabs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
on the road to reducing problems in the reactor so there are less<br>
issues to deal with in filtering, here's a new question.<br>
<br>
does anyone know where to look for experimental results on the impacts<br>
of increased steam in pyrolysis environments? my hunch is that<br>
increased steam will lessen the production of PAHs and general double<br>
carbon bonded refractory tars. we know we can do this by reducing<br>
pyrolysis temp and slowing the ramp rate, but will steam also help<br>
with this?<br>
<br>
the literature shows a marked decrease in soot production in<br>
combustion environments where there is high steam. steam apparently<br>
interrupts the agglomeration on the PAH nucleus. thus to the degree<br>
we can maintain adequate temps, steam is helping us with soot<br>
reduction.<br>
<br>
but what about during pyrolysis? does it reduce PAH production? do<br>
it have other marked effects on the type of tars make? in general,<br>
are there wins to be had with steam in pyrolysis that make things<br>
meaningfully easier to deal with downstream?<br>
<br>
i'm about at the end of what i can do on temp control during<br>
pyrolysis. i'm hoping there is another route to engage to continue<br>
improving the outputs of the pyrolysis stage.<br>
<br>
j<br>
<br>
<br>
<br>
<br>
<br>
--<br>
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</blockquote></div><br><br clear="all"><br>-- <br>************************************************<br>P.V.PANNIRSELVAM<br>ASSOCIATE . PROF.<br>Research Group ,GPEC, Coordinator <br>Computer aided Cost engineering<br><br>
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