Dear David,
Please find my comments below.
Best Regards,
Rajan
Message: 2
Date: Tue, 14 Sep 2010 12:37:36 -0400
From: "David G. LeVine" <[email protected]>
To: Discussion of biomass cooking stoves <[email protected]>
Subject: Re: [Stoves] don't burn the charcoal bury it
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
On 09/14/2010 10:32 AM, Nat of WorldStove wrote:
Dear Rogerio, Kim, Crispin, Paul and all,
The real powers of biochar producing stoves are:
1) lower emissions
2) eliminate the need to cut down trees for fuel
Really? How does that figure? Assuming the energy needed is constant
and the fuel source is constant, the need for fuel will increase if
biochar is sequestered since biochar has a carbon content which can be
used to provide energy.
These stoves operate at a high level of thermal efficiency - which means
they consume less fuel for the same task.
Also, only the pyrolysis gases ( which contain around 2/3rd of the total
energy content of the fuel ) are used for cooking.
When only biomass residues ( many of them available as waste materials ) are
used for fuel, we avoid cutting of trees.
When the resulting charcoal ( which contain only around 1/3rd of the total
energy content of the fuel ) is put back into the soil, the whole process
becomes carbon-negative. This means we are practically removing carbon from
the atmosphere.
In case the financial constraint is acute and if it is possible to sell the
lumpy part of the charcoal - this adds to the family's income in a small
way. Even then ( assuming the buyer is burning the charcoal ), the whole
process is carbon-neutral ( since only residues are used ). This means there
is no net addition of carbon to the atmosphere.
The real advantage of these stoves is that they can burn a variety of waste
biomass materials in a very efficient way.
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