I have a comment, look at all of the flame coming out the stack, that is not flame that traveled from the fire to the top of the stack, it is unburned wood gasses re-igniting as it gets more air. The real solution it to add AOF, but a slight improvement would be to add a blower, pushing air in over the fire to help burn those gasses where they can help boil the sap.
If you think you will keep that evaporator for 3 or more seasons, consider adding high pressure air over fire (AOF). It will give you more boil on less wood. Read up on the subject, there are few threads on this site about it, and I've linked a study from Vermont Maple Research giving some details.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.
I have a blower on my arch and I can't believe how much it helped to both increase my boil rate and clean up the smoke.
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