As the rigidizer dries in my first forge, I am anticipating about adjusting
the Zoeller sidedraft propane burner. Seems like there are alot of
variables, but Mr. Zoeller did mention the 'sound'. Besides locating the
burner flare on the 3/4" (1-1/4" to 1-1/2") pipe, there is the location
(3/8", half the pipe inside diameter?) of the orifice to the pipe inlet, the
fuel pressure (8 lbs?) , and the draft damper setting.
. . . .I'm hoping the burner 'talks' to one, when it is tuned and working
I assume getting a neutral flame can have alot of variables too.
Sounds like a rookie has to jump in with both feet and test all the
Posted via a free Usenet account from http://www.teranews.com
The sound is more of a consistent flow from a gentle hiss to a full on
roar. If you hear a spluttering sound then you have to adjust the gas.
I made a forge for my friend, he was in a rush so didn't stick around
for a lesson in tuning. When asking him how he found the forge he
stated that it was spluttering, so I walked him through the tuning
process. He was fine after that :-)
There is a difference between amount of heat, and peak temp.
Think of a one-gallon bucket of hot water, say 140 F. And a five
gallon bucket of water at the same temp. Same temp, but the five
gallon bucket will melt more ice -- more volume of heat.
The sound is directly related to amount of heat, the amount of fuel
burning. The shape and color of the flame is a fair indicator of peak
temperature, how hot the flame is at the hottest. You adjust the
shape of the flame, the blue cone in the middle, to correctly observe
whether there is enough air to burn all the fuel cleanly (neutral
flame), too much air (oxidizing flame), or insufficient air.
Sometimes you want an oxidizing flame when you want to reduce rust or
carbon, sometimes you want to affect carbon less in the forge. You
will want to notice how different materials work in neutral,
oxydizing, or other flames (the adjustment will be subtle, you don't
want a *lot* of extra or insufficient air), Adjust the placement of
the flare, the orifice/nozzle tip placement for this, and to some
extent the air path. You shouldn't have to make much change as the
amount of fuel is increased or decreased (at least, if you aren't near
the max or min limits for the burner).
When running, the flame will make a roaring sound, This will be
related to the amount of fuel burning. The volume of heat. The
temperature will be related to the type of fuel you burn, oxygen
content of the air (usually pretty consistent!), and ratio of oxygen
(air) to fuel -- the shape of the flame.
Any burner will have a maximum limit to how much air and fuel can be
combined. Usually we can increase fuel pressure past the amount of
air we can provide to the flame, which is why forced-air burners were
developed in the first place. Many of us have returned our interest
to naturally aspirated (Zoeller, Ron Reil, etc) burners. There are
different sizes for different volume capacities. On the low end,
getting a very small amount of heat is as much a matter of design as
the max amount. The flared nozzle is one of the key parts for good
operation full-bore and cranked down. One innovation I liked on the
Ron Reil pages was a split fuel line. One side had a valve ro
adjusting the full-bore flame, I think a ball valve. The other side
had needle valve, sort of a 'pilot' setting at the lowest amount of
fuel that would sustain a flame. The larger valve could them be shut
off between heats, but the forge would stay hot on a minimum flame.
And you wouldn't have to re-light.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.