flame color meaning

flame color meaning

PostBy: rberq On: Sat Jan 26, 2008 8:28 pm

Can anyone tell me what different flame colors mean? Am I getting better or more-complete combustion in some cases, compared to others, or maybe better coal? (It's all anthracite) I have noticed these distinct color situations:

1) Yellow: Using charcoal, with coal on top and with lots and lots of air, to start a new coal fire.

2) Blue flames filling the whole firebox above the coal, the first 15 or 20 minutes after getting a stove reload well-established and turning down the air inlet to normal. Is there a lot of out-gassing from the coal that causes this? With some different coal suppliers (I've been experimenting) there are noticeably fewer flames.

3) Short blue flames quite visible over black coal, once a reload has been burning a half-hour or so but the coal bed is not glowing red all the way to the top. With some different coal suppliers the flames are a paler blue and closer to being invisible.

4) No visible flame at all after the whole coal bed is glowing red like the pits of hell.
rberq
 
Hand Fed Coal Stove: DS Machine 1300
Coal Size/Type: Nut -- Kimmel/Blaschak/Reading
Other Heating: Oil hot water radiators, propane