Putting my AA130 to use

 
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StokerDon
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Joined: Mon. Nov. 11, 2013 11:17 am
Location: PA, Southern York County!
Stoker Coal Boiler: Gentleman Janitor GJ-5, Van Wert VA-600, Axeman Anderson130 X3.
Hand Fed Coal Furnace: Harman SF3500 reduced down to 3 grates connected to its own plenum
Coal Size/Type: Rice, Chestnut and whatever will fit through the door on the Harman
Other Heating: Noth'in but COAL! Well, Maybe a little tiny bit of wood

Post by StokerDon » Sun. Feb. 18, 2024 7:11 pm

Retro_Origin wrote:
Sat. Feb. 17, 2024 9:21 pm
I'm not sure how to wrap my mind around the inkbird thermocouple only seeing radiant heat...if I can control my boiler with the same probe typed in an immersion well than how will air temperature not drastically effect it's performance?
With out trying to give a class on electromagnetic phenomena and wave propagation, here is the basic idea.
There are 3 kinds of heat,
1) Conduction = You touch it and you feel the heat.
2) Convection = Air being heated to a higher temp than the surrounding air.
3) Radiant = The heat that you feel with out touching it or feeling the air that is heated.

Radiant heat is radiation from a heating device that emits radiation in the Infra red part of the spectrum. I think of it the same way I think of omni-directional transmit and receive antennas. The heat is being emitted in all directions and the sensor sees the heat from all directions.

Another thing to think about is if a thermal imaging camera saw air temperature instead of radiant heat, the temperature of the air would completely block its view.

-Don

 
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Retro_Origin
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Joined: Sun. Feb. 21, 2021 7:46 pm
Location: Schuylkill county
Stoker Coal Boiler: 1957 Axeman Anderson 130
Coal Size/Type: Buckwheat / Pea

Post by Retro_Origin » Sun. Feb. 18, 2024 8:01 pm

StokerDon wrote:
Sun. Feb. 18, 2024 7:11 pm
Another thing to think about is if a thermal imaging camera saw air temperature instead of radiant heat, the temperature of the air would completely block its view.
That actually makes a lot of sense.


 
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Retro_Origin
Member
Posts: 988
Joined: Sun. Feb. 21, 2021 7:46 pm
Location: Schuylkill county
Stoker Coal Boiler: 1957 Axeman Anderson 130
Coal Size/Type: Buckwheat / Pea

Post by Retro_Origin » Fri. Mar. 22, 2024 7:56 pm

So I finally resolved an ongoing problem, outfires, it seemed to happen after a nighttime heat call, then the day would get warm and the fire would go out, it happened once last week and then almost again this week, I've been noticing that many times during idle there would be this little cluster of burning coal crawling up the transfer tube, I checked the flapper door gap and then assumed it must be air being drawn around the transfer head gap where it meets the boiler, but then one day when the bin had run empty I noticed I could hear the fan through the auger....that was an aha moment for me, I verified it with the draft gauge and now that I'm sure to have several buckets in the bin, the problem has completely disappeared and there is no red coals visible at idle.

It makes sense because the auger does not offer much air resistance due to the center being hollow.



I think this is what caused my low and slow tests to be unrepeatable, the high riding coal would create dead spots in the fire and also starve the lower part of the fire for air


I noticed most other guys are feeding out of a multi ton hopper so maybe they wouldn't see the same issue .

It's kind of like an EFM except backwards! Not enough coal in the hopper makes the air go the wrong way!
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