[Gasification] pre mixed boiler secrets?

[Greg Manning]

Why I'm going to even answer is beond me, after this last row, but WTF.

 Jim,

 two things come to mind.

 1) venturi mixing.

 2) flame arestors (like the miniture versions one puts on an Oxy/Acetelene
torch).


 Venturi Mix is simple, the flame front speed can NOT pass the venturi.

 Arestors are a bit more complex.

Greg
On Mon, May 16, 2011 at 11:55 AM, David G. LeVine <dlevine at speakeasy.net>wrote:

> On 05/16/2011 02:07 AM, jim mason wrote:
>
>> 1. keep the mixture outside the flammability limits of the fuel
>> 2. keep the gas/air velocity faster than the flame front of the fuel
>> 3. keep the temp below the autoignition p[o]int of the fuel
>>
>
> 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.
>
> 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.
>
> Dave  8{)
>
>
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-- 
 Regards,

Greg Manning,
Brandon, Manitoba, Canada
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