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Old February 17th, 2015, 03:39 PM
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How about a variation of "AUF", but in the stack. What I mean is take a regular 3 foot section of stack, cut a hole in it, attach a squirrel cage fan with plenum at a severe angle up ( say only 10-15 degrees off vertical), and let it go.
If it would pull hot exhaust air up through the stack, seems like it may do the job of AUF without touching the natural draft arch itself. Just turn it on and go. No adjusting the fan, no turning it on and off, no smoke or embers out the loading door when firing...
If it'd work, I'd do it. If someone knows it wouldn't work, I'd like to hear why because I don't know.
No break in the cold snap in sight here, even the 10 day doesn't look good.
take care, Mark
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Old February 17th, 2015, 03:48 PM
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Flue gases run from 600-1400 degrees. I do not think there is a blower that would take the heat.
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Old February 17th, 2015, 04:10 PM
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Yeah, I read my first sentence and it said "in" the stack. I meant to say outside the stack, attached to the stack with a transition/plenum, nearly vertical pointing up.
thanks, Mark
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Old February 19th, 2015, 09:52 AM
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In theory, yes. You can induce increased flow through the draft system that way, but you would want a small high velocity stream directed nearly straight up the stack. If you just add a low pressure blower into the base of the stack, even if pointed mostly up, you are likely to add back pressure to the system.

If you look at old film of steam locomotives under load, you can see that the steam exhaust is combined with the combustion exhaust and it is for the purpose of draft enhancement, just like you are talking about. See youtube clip below if interested.

These were called blast pipes and were invented in 1804!



The Ultimate Steam Page

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Old February 19th, 2015, 10:00 AM
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That will work. 2 examples:
On my first homemade rig, I mounted a small fan on a 90 degree sweep that started its life as an exhaust pipe. So the air went into the stack horizontally, then turned 90 degrees to point straight up the stack. I think I welded a curved plate to the sweep to aid in mounting it to the 26 gauge pipe.
A friend has an outdoor boiler for residential heat. It has a very complex, convoluted path for the smoke and flames thru the unit. He also has a squirrel cage type fan mounted on the stack. Not sure how the air enters the stack or how it works, but if the fan isn't running, there isnt much draft.
In both cases here, the fan pumps cold fresh air, not smoke or heat.
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Old February 19th, 2015, 12:00 PM
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Well I guess its time to tinker a bit with some "spare" exhaust stack we have and aren't using now. I get ideas from time to time, some are uh, kwap, a few work. I guess we'll see. Thanks for the responses, I find that encouraging, even if it turns out not to work for us.
take care, Mark
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Old February 19th, 2015, 02:25 PM
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Does the word Venturi effect come to mind.
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Old February 24th, 2015, 06:46 PM
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Mark - Neat idea. It is common in most Electric Generating Plant Boilers - as Forced Draft only boilers - are dirty beasts - especially if coal fired. Mark - I was a Boiler Operator for 12 years - But - that was 30 years ago --- So---The memory thing. Anyway - the boilers I fired - had two Induced Draft Fans and two Forced Draft Fans and when up to full load - all four fans were operating. However - They were tied together with boiler controls to maintain .3 inches of draft (If I remember right) Always - more Induced Draft than Forced Draft to keep boiler furnace from going under pressure. Now - A Power Plant Boiler has to be more efficient than a maple syrup arch - But - Yep - I think You could do it. It would be a mite tricky the way you describe - but fun to play with. ---Mike---
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Old February 24th, 2015, 07:00 PM
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Quote:
Originally Posted by Ausable View Post
However - They were tied together with boiler controls to maintain .3 inches of draft (If I remember right) Always - more Induced Draft than Forced Draft to keep boiler furnace from going under pressure.
Mike, can you elaborate on the amount of draft needed to maintain an efficient system?

I have one of these: Low-Pressure Differential Gauge

Would I want to take readings at the front, near the arch door (when closed)?
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Old February 25th, 2015, 10:15 AM
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On my first arch build I set up a venturi effect system that did work. Had a dual squirrel cage fan with one side pushing air under the fire, and one side to the stack pipe.
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