[Gasification] filtration options and their varying discontents

[David G. LeVine]

On 12/10/2012 02:44 PM, jim mason wrote:
> 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.
>
> 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.

Would a flame arrestor (basically a couple of layers of copper screen or 
a layer of copper wool) just before the ESP be sufficient to prevent 
propagation into the rest of the system?  All that needs is a pressure 
relief in the ESP for when there is a "marginal event".  If the throttle 
is before the ESP, not even a pop-off would be needed, but the volume 
sounds like it would be a bit too large that way.

Dave  8{)

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