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<div class="moz-cite-prefix">Dear SNV and Tuong DoDuc,<br>
<br>
I have not worked with continuous feed rice-husk gasifiers. I
have had success with using dry woodchips/pellets, but not
financially viable at household level.<br>
<br>
The rice husk expert is Alexis Belonio. I am sending him a copy
of this message because he does not always read all of the Stoves
Listserv messages. I suspect that he would agree with the
remainder of my message:<br>
<br>
Note: Your current level of activities are already advanced
because your starting point is based on the Belonio work. And
your level of questions cannot really be addressed via email
messages. What is needed is hands-on work by experienced people
with advanced equipment (at least PEMS-level measurements) with a
timetable and a budget that can cover some serious expenses by the
best people. Or go to Belonio, paying your own way and paying
something to him and the entity where he is working, and there you
will find answers with real depth. <br>
<br>
Opinion: An organization the size of SNV (and others) should
bring in the assistance you need, or be prepared to re-plow the
same fields (re-inventing the same wheel) that Belonio and others
have done at considerable personal expense and sacrifice. <br>
<br>
Technical note: I have for a long time been impressed by the
beautiful blue flames from the rice husk gasifiers. But your
materials call attention to soot deposition from these flames.
So I conclude that the blue flames from rice husk should not be
equated with the super-clean combustion with blue flames from
natural gas, LPG, biogas and alcohol. Super-clean burning is
harder to do than meets the eye that sees blue flames.<br>
<br>
Your work is to be commended, and encouraged to continue. But
this is serious research. And I do not normally associate SNV
with such technical research (but I could be mistaken).
Somebody needs to get this work done, and I hope that SNV and
others will put the needed resources into resolving these
important issues. <br>
<br>
And the studies need to address the issues of cost of a device
that is targeted to serve single households. Even when a unit
such as you are constructing is functional, it might not be
affordable or even appropriate for the HOUSEHOLD target. Maybe
for restaurants??? or for small commercial needs such as
significant heating of water for hotels, etc.??? <br>
<br>
Dr TLUD<br>
<pre class="moz-signature" cols="72">Paul S. Anderson, PhD aka "Dr TLUD"
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a> Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
On 5/13/2013 8:23 PM, Tuong DoDuc wrote:<br>
</div>
<blockquote
cite="mid:CAJaUSMNHfwozi-gjuzetBwKen0AAKQDLJPgRu916ejYW=L7vuA@mail.gmail.com"
type="cite">
<div dir="ltr">Dear Dr.TLUD, Paul Oliver, and others,
<div><br>
</div>
<div>
<div class="gmail_quote">
<div dir="ltr">
<div>The team in SNV Vietnam is adopting the continous
gasifier model developed by Belonio. The manual has been
obtained from the <span
style="font-size:13px;color:rgb(51,51,51);font-family:arial,sans-serif;line-height:17px">CRHET. </span><br>
</div>
<div><font color="#333333" face="arial, sans-serif"><span
style="line-height:16.988636016845703px">Watch our
first propotype: </span></font><a
moz-do-not-send="true"
href="http://www.youtube.com/watch?v=xQGS-VQIj5M"
target="_blank">http://www.youtube.com/watch?v=xQGS-VQIj5M</a></div>
<div>We were able to control the fire, load fuel without
affecting the fire, and easily remove char at the bottom
of the reactor. </div>
<div><br>
</div>
<div>We also adopted the computer fan-casing by a cheaper,
more popular fan in Vietnam (often used for coal and
fixed wood stove). Fan costed 2USD (while to replicate
Belonio's fan-casing, we bought the adapter for 5USD and
a computer fan for 1.5USD)</div>
<div><br>
</div>
<div>However, this is just our first step and we still
have so many problems to fully control the fire and ease
the operation. </div>
<div>1) For instance, uncontrolled moment happened when
combustion occurs rigt on top of the fuel hopper, a lot
of smoke was produced and later the fire burnt the fan. </div>
<div><a moz-do-not-send="true"
href="https://www.dropbox.com/s/43fkjs0axuye4oj/uncontrollable_moment.jpg"
target="_blank">https://www.dropbox.com/s/43fkjs0axuye4oj/uncontrollable_moment.jpg</a></div>
<div><a moz-do-not-send="true"
href="https://www.dropbox.com/s/rd1g1cg0a9ue8qt/fan_casing.jpg"
target="_blank">https://www.dropbox.com/s/rd1g1cg0a9ue8qt/fan_casing.jpg</a></div>
<div><br>
</div>
<div>2) Another problem is that a lot of tar is produced.
It deposits on pot bottom, burner and other part of the
stove. That would also harm the user. An idea is to
create a layer of char in the burner pipe (to filter the
tar). Not tried yet.</div>
<div><br>
</div>
<div>3) We observes 5-10% of the gas leaked out through
the char removal door. We burnt them, but user may not
know (or they simply just don't care) that it is toxic.</div>
<div><br>
</div>
<div>4) One more, it is very hard to control the final
minutes of the gasificatoin process. It always cause
inverted combustion to the fuel hopper. </div>
<div><br>
</div>
<div>By this email, I would like to ask if some of you
have done similar work with continuous gasifier like
this to share more experience. We can thus reduce our
time and effort in localizing this technology.</div>
<div><br>
</div>
<div>Best regards,</div>
<div><br>
</div>
<div>Do Duc Tuong,<br>
</div>
<div><br>
</div>
<div>Renewable Energy Advisor</div>
<div>SNV Vietnam</div>
<div><br>
</div>
</div>
</div>
<br>
</div>
</div>
<br>
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</blockquote>
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