[Stoves] High mass space heating options Re: Rocket Stove forthe PLACE

[Kevin]

Dear Paul
  ----- Original Message ----- 
  From: Paul Olivier 
  To: Discussion of biomass cooking stoves 
  Sent: Tuesday, October 11, 2011 9:44 PM
  Subject: Re: [Stoves] High mass space heating options Re: Rocket Stove forthe PLACE


  ...del...

  For example, one kg of rice hulls produces about $0.21 in gas but only about $0.07 in biochar.
  In other words, biochar comes in at only one third of the value of the gas.

  # Very interesting!! 
  1: Does the 1.0 kG of rice hulls yield EITHER $.21 of gas OR $.07 worth of char
  OR, 
  does it yield $.21 worth of gas + $.07 of char, total $.28 per kG?

  2: What is the weight yield of biochar from 1 kG of rice hull?

  3: Are the people actually using this biochar for agricultural purposes?

  Thanks!!

  Kevin

  Biochar production therefore is a by-product of gas production.
  But if the the rice hull can be obtained, as is usually the case, free-of-charge,
  and if biochar can be sold at a nice profit,
  then gas is produced at a negative cost.
  Also note that when rice hulls are properly gasified,
  no smoke is produced.
  So in producing gas, one earns a profit in the sale of biochar.
  The big economic driver in this instance is the production of gas.

  There are people in Vietnam who know nothing about the value of rice hull gas,
  and they are busy each day making rice hull biochar in crude retorts.
  These low-temperature retorts emit clouds of smoke that can be seen from miles around.
  Focusing only on biochar production, these people do a lot of damage to the environment and should be shut down.
  The biochar that they produce is anything but uniform.

  For more on this, see: 
  http://dl.dropbox.com/u/22013094/Paper/park.pdf
  See the section on gasification starting on page 79.
  I am a big believer in utilizing a multiplicity of approaches with regard to biomass.

  Thanks.
  Paul Olivier
  Vietnam


  On Wed, Oct 12, 2011 at 6:40 AM, Steve Taylor <steve at thetaylorfamily.org.uk> wrote:




    On 11 October 2011 17:55, Fireside Hearth <firesidehearthvashon at hotmail.com> wrote:

      Dear Steve,

              I spent most of my adult life teaching people how to heat their homes without smoke coming from the chimney, when I see pictures of areas where bio char is being made I see horrible air pollution from the fires,


    I see "biochar" being used as an excuse for burning to clear land rather than the emissions generated being considered pollution from the process of making it. 

    Steve 


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  -- 
  Paul A. Olivier PhD
  27C Pham Hong Thai Street
  Dalat
  Vietnam

  Louisiana telephone: 1-337-447-4124 (rings Vietnam)
  Mobile: 090-694-1573 (in Vietnam)
  Skype address: Xpolivier
  http://www.esrla.com/



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