<div>Why I'm going to even answer is beond me, after this last row, but WTF.</div>
<div> </div>
<div> Jim, </div>
<div> </div>
<div> two things come to mind.</div>
<div> </div>
<div> 1) venturi mixing.</div>
<div> </div>
<div> 2) flame arestors (like the miniture versions one puts on an Oxy/Acetelene torch).</div>
<div> </div>
<div> </div>
<div> Venturi Mix is simple, the flame front speed can NOT pass the venturi.</div>
<div> </div>
<div> Arestors are a bit more complex.<br><br>Greg</div>
<div class="gmail_quote">On Mon, May 16, 2011 at 11:55 AM, David G. LeVine <span dir="ltr"><<a href="mailto:dlevine@speakeasy.net">dlevine@speakeasy.net</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div class="im">On 05/16/2011 02:07 AM, jim mason wrote:<br></div>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div class="im">1. keep the mixture outside the flammability limits of the fuel<br>2. keep the gas/air velocity faster than the flame front of the fuel<br></div>3. keep the temp below the autoignition p[o]int of the fuel<br>
</blockquote><br>Another approach: Add a flame holder (coarse grid or screen) in line with the flow. I have seen this done on burners and the flame front backs up to the grid and stops.<br><br>Since autoignition temperatures tend to be pretty high (above 450° F), this is not that big a problem, since if the fuel/air mix IS above autoignition temperatures, nothing downstream will stop it.<br>
<br>Dave 8{)
<div>
<div></div>
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