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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