I once designed a gasifier that had a reactor enclosed by a stainless steel housing.<br>The fan was situated at the top of the housing.<br>The fan forced hot air to travel from top to bottom.<br>So all primary air entering the reactor at the bottom was heated.<br>
<br>The problem with such a concept is the cost of the stainless steel housing.<br>This doubles the price of the gasifier.<br><br>Paul<br><br><div class="gmail_quote">On Sun, Nov 4, 2012 at 7:32 PM, <span dir="ltr"><<a href="mailto:mnurhuda@ub.ac.id" target="_blank">mnurhuda@ub.ac.id</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear Mr. Larson, Dear Prof Anderson,<br>
<br>
I have answered the email of Mr. Larson in his private address, but the<br>
email was unfortunately bounched.<br>
<br>
Currently I am awaiting for flight to Jakarta, such that I have only a<br>
little time to give answers.<br>
<br>
The effect of pre-heating is significant. One of my student has been<br>
devoted his diploma work for this study. The result is clear, that<br>
pre-heating can improve the efficiency of combustion, because the radiant<br>
heat produced by burning tube is returned back in term of heated air to<br>
the burning chamber such that the combustion becomes much better.<br>
<br>
The difference between the traditional TLDU stove and our stove is merely<br>
the presence of additional cylinder between housing tube and burning tube.<br>
<br>
Ok... I have to go now...have a nice day...<br>
<br>
Regards<br>
M. Nurhuda<br>
<div><div class="h5"><br>
<br>
> Dear Ronal and Prof. Nurhuda,<br>
><br>
> I too await the answers to Ron's questions. And add a comment about<br>
> what Ron wrote:<br>
>> you appear to be pre-heating both primary and secondary air - can you<br>
>> attribute any performance improvement to that? (I know of no-one else<br>
>> doing both)<br>
> I cannot think of anyone preheating primary air in a TLUD to any<br>
> significant degree. That is because there is no serious heat in the<br>
> lower areas of TLUDs until the pyrolysis front makes it at least half<br>
> way down the column of fuel. And then the heat is by conduction through<br>
> the metal sidewalls.<br>
><br>
> Looking at the video by Nurhuda, I do not detect any effort to pre-heat<br>
> the primary air. He can clarify that for us. What is important is<br>
> the quality of the control of the amount of primary air that can<br>
> enter. VERY WELL DONE. His stove should be a case study of<br>
> industrial manufacturing of natural draft TLUDs.<br>
><br>
> I request from Prof. Nurhuda as much additional information as<br>
> possible. The more that everyone and the GACC knows about the<br>
> Indonesia TLUD success story, the more opportunities there will be for<br>
> the further scaling up to serve people in Indonesia and elsewhere.<br>
><br>
> Paul<br>
><br>
> Paul S. Anderson, PhD aka "Dr TLUD"<br>
> Email: <a href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a> Skype: paultlud Phone: +1-309-452-7072<br>
> Website: <a href="http://www.drtlud.com" target="_blank">www.drtlud.com</a><br>
><br>
> On 11/3/2012 11:47 AM, <a href="mailto:rongretlarson@comcast.net">rongretlarson@comcast.net</a> wrote:<br>
>> Prof. Nurhuda<br>
>><br>
>> This is a really fine looking stove. The part that intrigues me<br>
>> most is that you are controlling secondary air for the pyrolysis<br>
>> gases. And apparently doing it (and primary air) well with the<br>
>> rotating disc mechanism. I do not recall seeing any other stove<br>
>> controlling both (without a fan) - so any data on the value of that<br>
>> for users of the stove could be very helpful to others. (Can they<br>
>> control excess air by the look of the flame?)<br>
>><br>
>> A few questions:<br>
>><br>
>> the price?<br>
>> sales going well?<br>
>> what percentage char by weight?<br>
>> any soil improvement results from using the biochar?<br>
>> can you do more than a 4:3 turndown ratio? (based on your two<br>
>> stated power levels)<br>
>> apparently you are striving for biochar (great!), but can you<br>
>> describe conditions if you try to burn the produced char?<br>
>> any efficiency data?<br>
>> you appear to be pre-heating both primary and secondary air - can<br>
>> you attribute any performance improvement to that? (I know of no-one<br>
>> else doing both)<br>
>><br>
>> Thanks for the alert on your stove.<br>
>><br>
>> Ron<br>
</div></div>>> ------------------------------------------------------------------------<br>
>> *From: *<a href="mailto:mnurhuda@ub.ac.id">mnurhuda@ub.ac.id</a><br>
>> *To: *<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a><br>
>> *Sent: *Saturday, November 3, 2012 5:03:54 PM<br>
>> *Subject: *[Stoves] Smoke-free biomass pellet fueled stove<br>
<div class="HOEnZb"><div class="h5">>><br>
>> Dear all,<br>
>><br>
>> Please check to following page to see the video of our smoke-free,<br>
>> biomass-pellet fueled stove:<br>
>><br>
>> <a href="http://www.youtube.com/watch?v=uWt25oD1iWk&feature=youtu.be" target="_blank">http://www.youtube.com/watch?v=uWt25oD1iWk&feature=youtu.be</a><br>
>><br>
>> Kind regards<br>
>> M. Nurhuda<br>
>><br>
>><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Paul A. Olivier PhD<br>27C Pham Hong Thai Street<br>Dalat<br>Vietnam<br><br>Louisiana telephone: 1-337-447-4124 (rings Vietnam)<br>Mobile: 090-694-1573 (in Vietnam)<br>
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