<br><br><div class="gmail_quote">On Mon, Dec 10, 2012 at 12:41 PM, David G. LeVine <span dir="ltr"><<a href="mailto:dlevine@speakeasy.net" target="_blank">dlevine@speakeasy.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>On 12/09/2012 10:34 PM, jim mason
wrote:<br>
</div>
<blockquote type="cite">other than the explosive risk</blockquote>
<br>
There is an interesting question here:<br>
<br>
Is there an explosion risk if the gasses have not been diluted by
the atmosphere?<br></div></blockquote><div><br></div><div><br></div><div>well, in principle, the gas should not be diluted with air during typical operation, and thus no explosion problem. you are correct. </div><div>
<br></div><div>the problem is typical operation is variable. during start up you always go through a stoich point as you move air out of the system and progressively make gas. even if you leave the system full of gas on shut down, start up in the reactor can pass lots of air until things get up to temp again. this can easily result in a combustible mixture in the system.</div>
<div><br></div><div>we've found this to be a fairly significant operational reality that needs to be addressed for regular users. similar for the impact of backfires from the engine igniting the intake stream. while things are "usually" ok, the marginal events can be quite, umm, compelling . . . we've started adding more pressure relief points where typically not needed to cover these outliers. we're also looking to add a flame arrestor right at the manifold to prevent backfires propagating.</div>
<div><br></div><div>again, you never use these during typical operation. somewhat like an ESP shouldn't cause any problems during regular operation. it is the outliers that are of concern. when you start running these systems regularly, you tend to find all the outliers. and the ones you don't find in house, those out in the fields certainly will.</div>
<div><br></div><div>j</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Let's start with gasoline, if we evacuate a bell jar and inject
enough gasoline so there is a layer of liquid gasoline on the floor
or in a pan, and we generate a hot arc 1/2" above the gasoline, will
there be an explosion? The correct answer is "only if there is an
air leak." <br>
<br>
Without an air leak, there will be no oxidizer, fire (or explosions)
require three things: Fuel, Oxidizer and Ignition. Fuel is
gasoline (in this case), Ignition is the spark, but where is the
oxidizer? <br>
<br>
If woodgas has excess oxidizer as it exits the reaction zone, it
simply burns off the extra gas. So, unless there is an air leak,
the reaction can not occur. However, if there is an air leak in
_any_ fuel system, there will be severe problems.<br>
<br>
Dave 8{)<span class="HOEnZb"><font color="#888888"><br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><br></div><br><br>Jim Mason<br>Website: <a href="http://www.whatiamupto.com" target="_blank">http://www.whatiamupto.com</a><br>Current Projects:<br> - Gasifier Experimenters Kit (the GEK): <a href="http://www.gekgasifier.com" target="_blank">http://www.gekgasifier.com</a><br>
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