[Gasification] raising H2 concentration indowndraft gasification

Pannirselvam P.V pannirbr at gmail.com
Sun Dec 22 04:25:24 CST 2013

Greetings to Rex and all list members

*Happy holiday  Xmas, New year  to  All the list members *

We have  very   good  open  technical information exchange here    and a
special happy holiday greetings  to   the  very  well organized technical
 team members of the list , well managed  by our  Word wide  list
Coordinator     Tom Mile , make possible all about  biomass  gasification
in one place , the image ,videos, all the list members  many  text comments
 in  an organised , easy to acess from anywheer from any time .

*Very Important  unsolved  Gasification  design problems *
   Coming to the very good topics REX has brought here , we need  to realy
break this silence  of many list members as the topic is  very , very
importante one , need  active atention of all list members , not silence
one can expects .

*The h2 rich  syngas *
     The  hydrogen rich    syngas  can be obtianed using pyrogas , charcoal
 with recycled  syngas  at  high tempertaures  above 800, as C02  will be
reduced , some methane may be there,

The carcoal can help to reduce  c02 , as well  provide energy needed , as
already pointed out by REX

This  hydrogen  rich gas   can be used for bio oil enrichmento  to  make
 valuable  biocrude   using mixed  catalyst as one  with Ficher tropics Fe
 as outline to make  oil from c02 , as well as bio oil  leaving  ,syngas
without the h2 ,  as this can be  recycled   back   to   make h2 rich
syngas from pyrogas  as described aboove

Thus there is syngas loop , and there is no  need to worry about PSA  C02
 problemas .

Thus pyrolysis can play key  role   along  with  charcoal  gasification
routes for syngas .Use of steam to increase the h2 is also need to be done
as very well  outilned by Kelvin  and Tomm need .The heat needed  all can
be obtained using  syngas  and steam production too depending on the local

*Syngas loop proven technology *

Syngas  recycle to  biomass  gasification  to make  methanol  via hygenol
 is already proven  to be viable to make methanol , howvever  syngas use to
biomass   gasification  can be more complex one.As pyrogas is  is the route
, as you prove the h2 requirement is less, this  new  h2 enriched  gas
without any need using only pyrogas and recycled gas  with charcoal  can
make possible  the h2 needed to make decentralised  biomassrefinery
production to make  biooil crude oil, biochar ,syngas  in a integratedway

*Small  biorefinery from biomass  need not be very big  and complex*
     As this innovative  process design   is very complex, Rex , one cannot
expect  more idea,  thus more silence from  list members is taking
place.Even list coordinatior usual comment from Tom ,what all  list members
can expects. One of  our list  the best   Technical  expertTom  Reed   ,
his very long year of practical  experience  need to becombined with  your

*Small Biomass refinery need To  energy products  need  to practical proven
one *

Already one  company from Europe sell comercialy via linkedin group , a
system to make  biocrude oil  wirth mechanical contact direct catalytic
hydrogenation  of biomass. The required h2 is obtained from
fractionationation  of biooilcrude oil ,as outlined by  REX. More
information  about this comercial process  is available via linked in
social Netwok .

I*nnovation with  ideas via Brain storming of all  is an urgent need,  not
the silence *

We need   more ideas, sugestion from young list members , not silence as
unexpeted from REX, as even  very bad idea, sugestion can help to find the
correct best innovative path .The brain storming by severl list members ,
not silence,  can be  made possible. We ,the list members  all are very
 well  conected by list Many , all  all know the basics of biomass,
gasification . Even the  new one   can learn very fast  ,as chemistry
 behind the technology  is well  explained her  our expert Tom Reed  make
 more clear  the required chemical pathway in order to  make the technology
 outlined well  too as the design  requirementos .Thus  sure new 2014  we
 can solve the   pyrolysis combined gasification  as small birefinery   for
energy the required design  problems ,clearly well defined by REX. The
solution related to enegy problems  given by  Kelvins. The science
 required by  Tom Reed, as  we small chemical engineering research group ,
the recycle process needed for process synthesis.

thus innovative proces  need both process design problems, process
synthesis, process analysis.All can innovate ,give ideas as silence  make
one pasive , let us all be ative as the per coreect wish from REX and list

King regards

Pannirselvam  P.V

Research Group ,GPEC, Coordinator Computer aided  Cost engineering
DEQ – Departamento de Engenharia Química
CT – Centro de Tecnologia / UFRN, Lagoa Nova – Nata
*l/RN Campus Universitário. CEP: 59.072-970;North East,Brazil*

*pannirbr at gmail.com <pannirbr at gmail.com>*

On Sun, Dec 22, 2013 at 4:26 AM, Rex Zietsman <rex at whitfieldfarm.co.za>wrote:
  This message is eligible for Automatic Cleanup! (rex at whitfieldfarm.co.za) Add
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> Dear Tom and the List,
> Happy holidays to all and merry Christmas for the 25th.
> Believe it or not, but we are going via liquefaction and catalytic cracking
> aided by in situ hydrotreating and deoxygenation of long chain hydrocarbon
> molecules all in one reactor. We produce a decent deoxygenated oil, not
> pyrolysis oil. Low yield - only about 250 litres/ton of 15% MC biomass.
> When
> tested via the ASTM tests for diesel, it has a longer tail at both high and
> low boilers - easily fixed with fractionation. But, if the starting
> feedstock contains sulphur, the residual sulphur is about 10% of the
> incoming. This can be as high as 500ppm in the oil which is fine for
> "standard" diesel. To make ultralow sulphur diesel we have to hydrotreat.
> Hence the hydrogen requirement.
> In one of our projects, we have waste vegetable oil at a good price. The
> idea is to deoxygenate this oil to produce a diesel similar to that from
> crude oil. Here the hydrogen requirement is high in the range of 30kg/ton.
> As it is still relatively small ie 1200 litres/hour, we need 30kg/hour of
> H2. Hence the post.
> All the best
> Rex
> -----Original Message-----
> From: Thomas Reed [mailto:tombreed2010 at gmail.com]
> Sent: 21 December 2013 12:07 AM
> To: Discussion of biomass pyrolysis and gasification
> Cc: <gasification at lists.bioenergylists.org>; John M. Bradley; Chuck
> Stevenson
> Subject: Re: [Gasification] raising H2 concentration in downdraft
> gasification
> Dear Rex and All;
> Merry Xmas and happy synthesizing.
> Rex must be a chemical engineer because he has outlined the problem nicely
> below.
> A partial solution is reaction of only the 80% cellulose in the wood to
> make
> a synthesis gas:
> C6H10O5 + 1/2 O2 ===> 6 CO + 5 H2
> And leaving the 20% lignin behind as charcoal (Biochar) for soil enrichment
> and atmospheric CO2 reduction.
> Reaction of part of the CO with water reduces the unbalance to an excellent
> synthesis gas:
>  6 CO + 5 H2 + 3 H2O ===> 3 CO + 8 H2. ||   ==> 3CH2 (oil)  + 3 H2
> Leaving enough excess H2 to drive the reaction forward.  Toplit Updraft
> gasification consumes the cellulose , leaving the lignin as Biochar.
> <><><>
> I am an expert in molecular sieves, and have made a quantity of a Fischer
> Tropsch catalyst with one isolated Fe atom per unit cell.  Should make a
> low
> MW diesel.
> <><><>
> If anyone has the means, and would like to pursue this, contact me
> privately
> with an offer.
> Tom Reed
> Dr. Thomas B Reed
> 280 Hardwick Rd
> Barre, Ma 01005
> 508-353-7841
> > On Dec 16, 2013, at 2:56 AM, "Rex Zietsman" <rex at whitfieldfarm.co.za>
> wrote:
> >
> > Hi All,
> >
> > We are looking at a system that will hydrotreat bio oils from
> > pyrolysis, catalytic cracking and vegetable oil. For this we need in
> > the region of 30kg hydrogen/ton oil. At small scale ie 1 ton oil/hour,
> > this works out at, you guessed it, 30kg of hydrogen/hour. As this is a
> > small amount in the overall scheme of things, we are looking at
> > gasifying wood chips and to recover the hydrogen using pressure swing
> > absorption. What I would like to know is whether we can increase the
> > H2 concentration in syngas by tweaking the gasifier. Clearly we can
> > look at the water gas shift reaction but, as the syngas has to be
> > cooled, washed, pressurised and reheated, it is quite an additional
> > investment for the scale we are looking at. If we could simply up the
> > H2 content, we would go straight from washing to PSA. Residual gas
> > would be piped to a diesel generator where CO and the like will be
> combusted prior to exhaust to atmosphere.
> >
> > For easy mental arithmetic, let us assume a 33% H2 concentration in
> > dry syngas. 30kg/hour of H2 is 15kmol/hour or 15/0.33 = 45kmol/hour of
> > syngas. A kmol of gas has a volume of 22.4 Nm3. So, to get 30kg/hour
> > requires 22.4 x
> > 45 = 1000 Nm3 syngas/hour (mental arithmetic here, go with the flow).
> > Assuming an 80% PSA recovery this means that we need 1250Nm3/hour of
> syngas.
> > Not a bad sized downdraft gasifier! Assuming 6MJ/Nm3, this is around a
> > 2MW thermal unit. If we can get the H2 concentration up to say 40%,
> > then the syngas requirement would be 37.5kmol/hour or 37.5/45 x 1250 =
> > roughly 80% of
> > 1250 or roughly 1000 Nm3 syngas/hour. This reduces the size of
> > gasifier to 1.6MW thermal and more sensible in size.
> >
> >
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