[Gasification] back to gasification

Tue May 31 10:22:25 CDT 2011

Hi Jan 
How would you proceed with a sawmill biomass feed stock that has 50% moisture content. ? I like the steam gasification process but is the moisture content too high? Or do you think Is it possible to substitute the nitrogen content with co2(?) in an ice and the keep recycling it into the gasification process thus eliminating the nitrogen out of the loop?   
 Thanks 
H.
ps i will check out the link you provided
  ----- Original Message ----- 
  From: Jan Kopyscinski 
  To: Discussion of biomass pyrolysis and gasification 
  Sent: Tuesday, May 31, 2011 8:30 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" <pannirbr at gmail.com>
    Gesendet: May 31, 2011 12:46:54 PM
    An: "Discussion of biomass pyrolysis and gasification" <gasification at lists.bioenergylists.org>
    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 <adkarve at gmail.com> 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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