[TheForge] Natural gas burner?

[Jerry Frost]

Every time I search for flammable gas to air ratios I get a different site. 
This one expressed everything in percentages and I actually had to use a 
claculator! So, everybody here will know what went wrong if my numbers dont 
line out properly. <grin>

A neutral, air : propane ratio is 16.5:1 or 6.06%. The min, max flammable 
range chart I found this time says the flamable range is 2.1% - 10.1%.

Methane min, max flammable range is 5% - 15%. I didn't find the neutral burn 
ratio, it was close to bed time and Red Green was on. <grin>

Assuming the neutral burn ratio is close to the middle of the min-max range, 
10% or a 10:1 air : fuel ratio seems about right for methane. It may NOT be 
right though, I don't have a chart at hand.

And as it works out mid range IS about right for propane at 6.06% or 16.5:1.

All this is interesting but you're going to tune your burners just the same 
way regardless. You'll do it by eye and effect. It is of course handy to 
have a place to start without having to guess at it too wildly.

Frosty
-------------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

http://www.artmetalradio.com/



From: "Rick Korinek" <rickkorinek at verizon.net>


> The energy content of each fuel is:
>
> natural gas  1000 btu per cubic foot (approximately, and at STP)
> propane 2,500 btu per cubic foot
>
> Assuming you will use the same pressure, the cross-sectional size of the
> orifice needs to be 2.5 times as big.  Note that does not mean doubling 
> the
> diameter of the hole.  Area = Pi r*r.
>
> You will also need to decrease the combustion air by about half.  The 
> amount
> of air to burn 1 cubic foot of NG is 10, for propane it is 24 cubic feet.
>
> Sound right to you, Mike Porter?
>
> -Rick