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<p style="margin-bottom: 0in;">Hey Jonathan</p>
<p style="margin-bottom: 0in;">The issue of incomplete combustion of
Jatropha seeds in a TLUD gasifier stove has in my opinion very
much
to do with that you by heating up the seeds in the stove gets two
different types of gasses. Pyrolysis gasses and vaporized Jatropha
oil. The last ones is much more difficult to crack and burn, they
will therefore require higher temperatures and more secondary air
for
full combustion. But it will also require much more control on the
burning rates in the stove.</p>
<p style="margin-bottom: 0in;">That is one of the reasons why we
have
changed our initial Jiko Mbono gasifier cookstove to our new Jiko
Bomba cookstove that use pellets as fuel.</p>
<p style="margin-bottom: 0in;">That brings me to another issue you
bring up. Why make pellets when farmers just can burn their
Jatropha
seeds.</p>
<p style="margin-bottom: 0in;">I find that there are several good
reasons for that.</p>
<p style="margin-bottom: 0in;">First, Jatropha seeds are in many
part
of Tanzania today a cash crop for farmers. They can sell the seeds
at
good prices to companies that press Jatropha seeds for getting
Jatropha oil. So most farmers will never burn a cash crop, they
will
sell it. He will rather sell it for cash he can spend and then ask
his wife to collect firewood for fuel, than burn the seeds up in a
stove.</p>
<p style="margin-bottom: 0in;">Secondly, I agree with you that there
are good quantities of Jatropha seeds, however these quantities
are
still relative small. It will only be few farmers that will be
able
to collect the 800 kg to 900 kg of Jatropha seeds that will be
required for a household's yearly demand for fuel. This will then
not
leave anything for meeting other households needs for fuel.</p>
<p style="margin-bottom: 0in;">However there are big quantities of
agricultural residues that are not utilized efficiently. These
agricultural residues can be turned into efficient fuel if they
are
pelletised. Calculations shows that if 30% of available
agricultural
residues in Tanzania are turned into pellets and burned in
efficient
gasification stoves, they would be able to cover all Tanzania's
households demand for fuel.</p>
<p style="margin-bottom: 0in;">Many of these agricultural residues
requires a binder and lubricator for pelletizing. This is
especially
the case for rice husk. 10% to 20% of jatropha press cake mixed
into
agricultural residues works very good. Such smaller amount of
Jatroha
press cake and less amount of jatropha oil does not represent a
problem for full combustion. Our Jiko Bomba cookstove and its
pellets
burns very clean and efficient when operated in the right way.</p>
<p style="margin-bottom: 0in;">Thirdly. Using These kind of pellets
in
our stove is very economical. Household that use our stove an
pellets
can save over 50% on there energy bill compared to when they use
charcoal, at least here in Tanzania. </p>
<p style="margin-bottom: 0in;">Besides that by using pellets made
form
agricultural residues households will use only renewable energy
sources. This will contribute to reducing the alarming
deforestation
rates here in Tanzania.</p>
<p style="margin-bottom: 0in;">You can find more information on our
stove on this link: <font color="#000080"><span lang="zxx"><u><a
href="http://www.treetanz.com/">www.treetanz.com</a></u></span></font></p>
<p style="margin-bottom: 0in;">The site is in Kiswahili, but I
believe you can read it.<br>
</p>
<p style="margin-bottom: 0in;">Bjarne Laustsen </p>
<p style="margin-bottom: 0in;"><br>
</p>
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