[Gasification] Wood Chip classificaton

[Kevin]

Dear Pete

I would suggest that a simpler, and better way to evaluate wood chips is to use a  "Two Screen System." For example, if you used square mesh screen with 1/2"x1/2", and 1"x1" openings, you would end up with 3 products:
1: +1"
2: -1", + 1/2"
3: -1/2"

The APA Gage is intended for a different purpose... to give a reflection of wood fibre length, because that is what is important to Pulp Mills. For gasifier applications, uniformity of size, and the percentage of void space is what is important. The "two screen system" should give screened chips from "between the screen decks" that are much more uniform, and having much better gas flow characteristics.

Best wishes,

Kevin 


  ----- Original Message ----- 
  From: Pete & Sheri 
  To: Gasification at bioenergylists.org 
  Sent: Wednesday, April 11, 2012 3:37 PM
  Subject: [Gasification] Wood Chip classificaton


  My only interest for gasifier fuel is wood chips.  If I can't understand them and  make them work well, I won't be using a gasifier at all.

   

  I know this may be old news to many of you, but I recently found a couple of ways to characterize wood chips.  Although there are plenty of good systems out there the best ones are way to complex and expensive for me. 

  So,  I am using a simple gauge from the APA (American Pulpwood Association.

    My simple page to explain the process is at:

   

  http://www.spaco.org/Woodgas/WoodChipMeasurement.htm

   

  It has links to a couple of in-depth sources for understanding wood chips, too.

   

  Pete Stanaitis

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