Kevin,<br><br>I understand what you mean by an oxidizing atmosphere.<br><br>I do not know what quality of stainless steel is used in the strainer that I have been using.<br>But it is definitely stainless steel, and it lasted three runs.<br>
I would assume that stainless steel is better than mild steel.<br>Would you agree?<br>Ordinary grades of stainless steel becomes brittle when subjected to this kind of heat.<br>446 stainless steel might have a chance.<br>
<br>Silicon carbide cloth is much cheaper than stainless steel,<br> and it is far more resistant to heat than stainless steel.<br>But I am not sure at what temperatures it emits the most thermal radiation.<br><br>Paul<br>
<br><br><br><div class="gmail_quote">On Tue, Mar 6, 2012 at 1:23 PM, Kevin <span dir="ltr"><<a href="mailto:kchisholm@ca.inter.net">kchisholm@ca.inter.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u>
<div bgcolor="#ffffff">
<div><font face="Arial">Dear Paul</font></div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px" dir="ltr"><div class="im">
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4"><b>From:</b>
<a title="paul.olivier@esrla.com" href="mailto:paul.olivier@esrla.com" target="_blank">Paul
Olivier</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="stoves@lists.bioenergylists.org" href="mailto:stoves@lists.bioenergylists.org" target="_blank">Discussion of biomass cooking
stoves</a> </div>
</div><div class="im"><div style="FONT:10pt arial"><b>Sent:</b> Tuesday, March 06, 2012 1:00
AM</div>
<div style="FONT:10pt arial"><b>Subject:</b> Re: [Stoves] the 150 gasifier in
operation in Vietnam</div>
<div><br></div>
</div><div class="im"><div>Kevin,<br><br>I do not think that normal mild steel wire mesh would make
it through a single gasifier run.</div>
<div> </div>
</div><div><font face="Arial"># Certainly, "red hot mild steel" in an oxidizing air
atmosphere will scale up and fail quickly. However, you don't have that....
you have a combustion zone atmosphere. It is very simple and cheap[ to try.
Try it, and let the screen itself tell you that it needs to be of higher
quality.</font></div><div class="im"><font face="Arial"></font>
<div><br>I'm afraid that it has to be something "exotic".</div>
<div> </div>
</div><div><font face="Arial"># Let the system prove to you that it needs to be
exotic. :-)</font></div><div class="im"><font face="Arial"></font>
<div><font face="Arial"></font><br>This wire mesh really gets hot.</div>
<div> </div>
</div><div><font face="Arial"># "Hot" is one thing, but "oxdizing atmosphere" is
another. If the atmosphere the screen "sees" is "adequately reducing", then
mild steel might be an economically good solution. On the other hand, as the
atmosphere becomes increasingly oxidizing, then the more exotic materials are
required. </font></div><div class="im"><font face="Arial"></font>
<div><br>Someone measured the temperature about 4 inches above the
dome.<br>When the probe reached 500 C, he stopped.</div>
<div> </div>
</div><div><font face="Arial"># A material that would fail in air at 500 C might
be quite acceptable in a reducing atmosphere at 500 C</font><br></div>
<div><font face="Arial"># The problem is one of Temperature AND Atmosphere. You
could probably reduce costs safely, with a test program that confirmed the
minimum quality screen material that would do an acceptable
job.</font></div><font face="Arial"></font></blockquote>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px" dir="ltr">
<div><font face="Arial">Best wishes,</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Kevin</font></div><div><div class="h5">
<div><br>Thanks.<br>Paul<br><br></div>
<div class="gmail_quote">On Tue, Mar 6, 2012 at 11:39 AM, Kevin <span dir="ltr"><<a href="mailto:kchisholm@ca.inter.net" target="_blank">kchisholm@ca.inter.net</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote"><u></u>
<div bgcolor="#ffffff">
<div><font face="Arial">Dear Paul</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Why not start with simple mild steel screen, of
various sizes, and test them to see how long they last?</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Exotic materials will probably last longer, but at a
very much higher cost. </font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Once you have cost and "lifetime" information, then
you can make the best decision about what materials to use.</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Best wishes,</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Kevin</font></div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px" dir="ltr">
<div>
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4"><b>From:</b> <a title="paul.olivier@esrla.com" href="mailto:paul.olivier@esrla.com" target="_blank">Paul Olivier</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="stoves@lists.bioenergylists.org" href="mailto:stoves@lists.bioenergylists.org" target="_blank">Discussion of
biomass cooking stoves</a> </div></div>
<div>
<div style="FONT:10pt arial"><b>Sent:</b> Tuesday, March 06, 2012 12:12
AM</div>
<div style="FONT:10pt arial"><b>Subject:</b> Re: [Stoves] the 150
gasifier in operation in Vietnam</div>
<div><br></div></div>
<div>
<div>446 stainless can handle temperatures as high as 1,200
C.<br>Silicon carbide is quite cheap, and it can handle temperatures as
high as 1,650 C.<br><a href="http://accuratus.com/silicar.html" target="_blank">http://accuratus.com/silicar.html</a><br><br>Thanks.<br>Paul<br><br>
<div class="gmail_quote">On Tue, Mar 6, 2012 at 11:02 AM, Anand Karve <span dir="ltr"><<a href="mailto:adkarve@gmail.com" target="_blank">adkarve@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">
<div>Dear Paul,</div>
<div>I have not worked with that grade of stainless steel and also not
worked with silicon carbide mesh.</div>
<div>Yours</div>
<div>A.D.Karve<br><br></div>
<div>
<div>
<div class="gmail_quote">On Tue, Mar 6, 2012 at 11:58 AM, Paul Olivier
<span dir="ltr"><<a href="mailto:paul.olivier@esrla.com" target="_blank">paul.olivier@esrla.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">A.D.,<br><br>I am looking for a 446 stainless steel
wire mesh.<br>Have you ever worked with silicon carbide mesh?<br>It is
used as an emitter in thermophotovoltaics.<br><br>Paul<br><br>
<div class="gmail_quote">On Tue, Mar 6, 2012 at 10:54 AM, Anand Karve
<span dir="ltr"><<a href="mailto:adkarve@gmail.com" target="_blank">adkarve@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">
<div>Dear Paul,</div>
<div>even stainless steel is no good. At high temperature, it
corrodes and crumbles into pieces.</div>
<div>Yours</div>
<div>A.D.Karve<br><br></div>
<div class="gmail_quote">
<div>
<div>On Mon, Mar 5, 2012 at 4:03 PM, Steve Taylor <span dir="ltr"><<a href="mailto:steve@thetaylorfamily.org.uk" target="_blank">steve@thetaylorfamily.org.uk</a>></span>
wrote:<br></div></div>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">
<div>
<div><br><br>
<div class="gmail_quote">On 5 March 2012 02:56, Paul Olivier <span dir="ltr"><<a href="mailto:paul.olivier@esrla.com" target="_blank">paul.olivier@esrla.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote"><br>I know that a tungsten wire mesh
exists.<br>But no doubt this would be too
expensive.<br><br></blockquote>
<div><br>Tungsten will oxidise to nothing very quickly. Probably
Incoloy would be ideal<br><font color="#888888"><br>Steve<br></font></div></div>
<div></div><br></div></div>
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<p></p><a></a>
<p color="#000000" align="left">No virus found in this message.<br>Checked
by AVG - <a href="http://www.avg.com" target="_blank">www.avg.com</a><br>Version: 2012.0.1913 / Virus Database:
2114/4852 - Release Date: 03/05/12</p>
<p></p>
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Street<br>Dalat<br>Vietnam<br><br>Louisiana telephone: 1-337-447-4124 (rings
Vietnam)<br>Mobile: 090-694-1573 (in Vietnam)<br>Skype address:
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<p color="#000000" align="left">No virus found in this
message.<br>Checked by AVG - <a href="http://www.avg.com" target="_blank">www.avg.com</a><br>Version: 2012.0.1913 / Virus
Database: 2114/4852 - Release Date: 03/05/12</p><p></p><p></p></div></div></blockquote></div>
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