[Stoves] K Smith Article in Energy for Sustainable Development

[Paal wendelbo]

Grispin

To your infomation if Dean dont' have the exact figures by hand the TLUD-ND I made at Stove Camp 2009 had the following settings.  

        The combustion chamber  had a diameter 150mm and was 180 h

  a.. 55 mm free space from concentration lid up to the pot
  b.. 105 mm hole in concentration lid
  c.. 6 mm split between concentration lid and top of thee combustion chamber - 4x15mm for the stand for 2nd air
  d.. 5 five mm holes 75 mm up from the bottom on the side of the combustion chamber 
  e.. 5 five mm holes 25 mm up from the bottom on the side of the combustion chamber 
  f.. 13 five mm holes at the bottom plate for 1st air
  g.. 15 mm space between combustion chamber an cover for preheating of 2nd.air
The combustion chamber was filled with 1kg of wood pellets and a complete 5 wbt carried out.with following result.
 

Fuel to Cook 5L 

(8 50/1500) g                   768.8

CO to Cook 5L (20)           23.0

PM to Cook 5L (1500      223.1

15,000/25,000mkJ             

Energy to Cook 5L         14,807

Time to boil 5 litres min      28.1

CO2 to Cook 5L               708.6



Regards Paal W

  ----- Original Message ----- 
  From: Crispin Pemberton-Pigott 
  To: 'Discussion of biomass cooking stoves' 
  Sent: Friday, December 03, 2010 2:40 PM
  Subject: Re: [Stoves] K Smith Article in Energy for Sustainable Development


  Dear Dean

   

  I really appreciate the info and the flexibility you have built into the stove. Can you please tell us how much fuel mass was burned (perhaps in the case of a char consuming version) and the MJ/kg of the fuel? I wondered what the emissions are per dry kg burned or per even better, per MJ of heat produced.

   

  My interest is to be able to make comparisons with other fuels and combustion efficiencies.

   

  Thanks

  Crispin

   

   

  From: stoves-bounces at lists.bioenergylists.org [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Dean Still
  Sent: 03 December 2010 13:31
  To: Discussion of biomass cooking stoves
  Subject: Re: [Stoves] K Smith Article in Energy for Sustainable Development

   

  Hi All,

   

  Adding more air holes in the bottom of the fuel chamber in a TLUD allows pellets to burn up completely. If users want bio-char they just have to have fewer holes. Then the char is made since there is not enough air to support burning it.

   

  If it is tuned (!), the TLUD is very low in PM when it does not make smoke when starting and finishing the burn. CO is also generally low. In the well tuned TLUD we generally see around 7g of CO and 400mg of PM during the WBT compared to a carefully operated open fire at 55g CO and 2300mg PM. Generally the TLUD makes less smoke at the finish with more air holes because all the wood burns up without making smoke.

   

  Isn't it great that a TLUD can be operated in both char making and no char making modes? 

  The user can choose whether they want greater fuel efficiency or to make an agricultural additive.

   

  Best,

   

  Dean 



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