[Gasification] reducing temp. of gasification

[Kevin]

Dear Jai
  ----- Original Message ----- 
  From: jai balwanshi 
  To: Discussion of biomass pyrolysis and gasification 
  Sent: Tuesday, October 11, 2011 2:05 AM
  Subject: Re: [Gasification] reducing temp. of gasification


  we have many method to reduce tar but i want which is most simplest.
  # Your very simple, but very important question was: "What is the simplest way to reduce tar?" I feel that the short answer is "Burn it." 

  # Support for this simplistic answer is based on the fact most gasifiers producing low tar woodgas seem to operate with a high reaction zone temperature. The trick is to burn the tars evolved by pyrolysis, while burning the least amount of char. This is accomplished in the Imbert Style of gasifier by optimal placement and sizing of the air jets in relation to the hearth size and location for the particular kind of fuel employed..

  # It would be very helpful to the List if you would be kind enough to outline some of the many methods you have to reduce tars.

  # Thanks!

  Kevin



  Jai Balwanshi
  Assistant Professor
  Mechanical Engineering Department
  VITS - Indore
  Contact No. 9713281992


----------------------------------------------------------------------------
    From: Pete & Sheri <spaco at baldwin-telecom.net>
    To: 'Discussion of biomass pyrolysis and gasification' <gasification at lists.bioenergylists.org>
    Sent: Tuesday, 11 October 2011 8:39 AM
    Subject: Re: [Gasification] reducing temp. of gasification

    Hello, Greg.
      I know that the correct solution to tar is to keep the reactor temp up,
    but, just in case,
    how do YOU test for tar? 

    Pete Stanaitis
    -------------- 

    -----Original Message-----
    From: gasification-bounces at lists.bioenergylists.org
    [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Greg
    Manning
    Sent: Monday, October 10, 2011 3:13 PM
    To: jai balwanshi; Discussion of biomass pyrolysis and gasification
    Subject: Re: [Gasification] reducing temp. of gasification

    Greetings, Jai, and list members.

    Reducing tars in gas output, is really quite simple, design a gasifier
    that works correctly for the desired feedstock is the main method,
    however, you can also design a poorly built gasifier, and use many
    cleaning filters after the gasifier, in the gas output pipes.

    But really, one must understand what "tars" are, and at what internal
    temperature the gasifier runs at, once this is known, then the design
    can be re-designed to achive the correct temperature to reduce the
    tars BEFORE they enter the gas output area.

    In other words, generally 2 or more gasifiers must be built (or the
    original one modified) to the point of acceptable level of tars within
    the gas output.

    Greg Manning
    Canadian Gasifier Ltd.





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