[Stoves] Charcoal as space filler in TLUD reactors

[Kevin]

Dear Ron
  ----- Original Message ----- 
  From: rongretlarson at comcast.net 
  To: Discussion of biomass cooking stoves ; Frank Shields 
  Sent: Tuesday, May 07, 2013 5:57 PM
  Subject: Re: [Stoves] Charcoal as space filler in TLUD reactors


  Frank and list:

       Need to bring in one more variable: fuel shape.  Imagine the fuel is pencil shaped.  If placed vertically, they work fine to make char.  If horizontal and parallel, they can block most vertical air flow.  Anyone able to supply biomass fuel spheres?

  # What diameter do you want? What material? Do you have a complete specification? How many tonnes do you want? How much are you willing to pay per tonne?

  Kevin

  Ron



------------------------------------------------------------------------------

  From: "Frank Shields" <frank at compostlab.com>
  To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org>
  Sent: Tuesday, May 7, 2013 2:46:13 PM
  Subject: Re: [Stoves] Charcoal as space filler in TLUD reactors

  Dear Martin, 

  I often determine the particle density here in the lab using free flowing
  sand. If the particle density of the fuel is determined (g/cc) and you know
  the weight of fuel packed in a known volume you know the volume of voids and
  can determine the air speed - I am thinking.  

  Frank




  -----Original Message-----
  From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
  ajheggie at gmail.com
  Sent: Tuesday, May 07, 2013 1:26 PM
  To: Discussion of biomass cooking stoves
  Subject: Re: [Stoves] Charcoal as space filler in TLUD reactors

  [Default] On Tue, 7 May 2013 09:22:19 +0200,"Boll, Martin Dr."
  <boll.bn at t-online.de> wrote:

  >You have to calculate the free space in order to get the real air-speed in
  this area.
  >I think even if that is naturally not the true surface-speed on the fuel,
  it is a good number to deal with.

  I think in gasification they use the term "superficial velocity" a fictional
  speed derived from the air volume and cross section of the chamber, the
  actual speed of any given bit of air flow through the spaces will be much
  higher of course.

  AJH

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