2x4 oil fired evaporator

[A1Builder]

Can any one help me i have a 2x4 grimm oil fired arch and a beckett burner I'm running a 2.50 gph nozzle at 80 degrees solid but i just can't get the syrup pan to boil. My pan is a 2x4 drop flue smokey lake hybrid pro. Am i running the right nozzle and do i need a damper in my stack.

[raptorfan85]

I am by no means an expert, but your nozzle seems plenty big enough for a 2x4. I'm running a homemade oil fired barrel arch with a Beckett burner, .75 gph 80* solid and I can boil 2 steam pans, hard. Do you have any insulation or fire brick? I don't run a damper in the pipe and I don't think you are supposed to with oil fired, but like I said I'm not an expert.

[A1Builder]

yes i have 2 inches inside of arch all the way around. my ceramic blanket is 1 inch from the bottom of my flue pan. My stack temperature is at 500 degree

[wiam]

Tell us more about your arch. Brand? Originally set up for oil? My guess is you flame is too far into the firebox. How does flue part boil?

[A1Builder]

i have 2 inches inside all the way around ceramic blanket. My stack temperature is 500 degrees and insulation is 1 inch from my flues pan underneath.

[wiam]

This might help. https://www.leaderevaporator.com/pdf_files/leader-insulated-oil-arch.pdf Your stack temp is low if you’re measuring about head high.

[A1Builder]

my arch is a Grimm 2x4 has a slope up to the back of the arch and then level to the stack pipe. i have a smokey lake 2x4 drop flue hybrid pan.

[A1Builder]

yes that about head high and its reading about 500 degrees but how do i get it hotter in the stack.

[raptorfan85]

How's the flame look? Should be a bright yellow almost white color. Any soot coming out the stack? Might need to adjust the air mix.

[A1Builder]

The flue pan boils great but no boil on the very front syrup pan. My arch looks like the leader oil fired arches but smaller.

[A1Builder]

No soot out of stack and flame is almost white, seems to be burning right.

[A1Builder]

Seems like my heat is going up the stack do i need a damper to keep the heat in the box.

[raptorfan85]

So it's just the front of the pan that won't boil? If so I'm with wiam, your flame is to far into the firebox. Mine doesn't boil until about 14 inches into the firebox, so I purposely set my pans farther back for that reason. It's never going to boil right over the gun, the closest it's going to boil is about 1/2 way over the flame.

[raptorfan85]

http://i328.photobucket.com/albums/l343/raptorfan85/Mobile%20Uploads/IMG_20180220_193148820_zpslrugi4lw.jpg (http://s328.photobucket.com/user/raptorfan85/media/Mobile%20Uploads/IMG_20180220_193148820_zpslrugi4lw.jpg.html)

Not the greatest picture, but you can see how far back from the gun my boil starts...

[A1Builder]

My syrup pan has two compartments the one closes to the gun doesn't want to boil ether but yours is a little better than mine.

[wiam]

On my gun (much larger but should work similar) I 1-lowered fuel pressure and put a higher gpm nozzle. (Nozzles are rated at 100 psi.) This gives same gpm just closer to the front. 2- I also pointed gun slightly up toward the pan. When I first built it the front half of my 4’ front pan would not boil very well. Now it boils great. Had to play with nozzles/pressure a bit to dial it in.

[raptorfan85]

Honestly I think your flame is just too far in to the firebox and it's just never going to boil in that back section of the pan...

[raptorfan85]

Just be careful lowering the psi to much, get too much below 100psi and you won't get proper atomization and you won't get a good burn from your fuel.

[Haynes Forest Products]

I would play with the transition a little to see if you can get the flame to bounce off it building up a little heat pressure under the pan. If you have some fire blanket you only have to lay it up on the transition area. DONT block the flues but get some turbulence in the combustion chamber. My stack temp is 585 and its the sweet spot. The hotter the stack the less efficient your rig is running. Blocking the flue stack isn't the best way to keep the heat in. It can get messy with soot blowing out the pan cracks and rail gasket.