Keystoker KA-6 Efficiency

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
Post Reply
danwesson623
New Member
Posts: 7
Joined: Mon. Jan. 27, 2014 7:01 pm
Stoker Coal Boiler: Keystoker ka-6

Post Fri. Jan. 31, 2014 10:52 pm

Is it more efficient to have the pusher set to feed more coal and produce the more BTU's and heat the boiler faster or feed less coal and heat slower?

User avatar
2001Sierra
Member
Posts: 1845
Joined: Wed. May. 20, 2009 8:09 am
Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
Coal Size/Type: Rice
Other Heating: Buderus Oil Boiler 3115-34
Stove/Furnace Model: Keystoker 90 Chimney Vent
Location: Wynantskill NY, 10 miles from Albany

Post Fri. Jan. 31, 2014 11:07 pm

If the ash is the same then it does not matter. Also stack temperature does come into play. I like low and slow, but that is my opinion and you know they are like a$$holes everyone has one :P

User avatar
KLook
Member
Posts: 3636
Joined: Sun. Feb. 17, 2008 1:08 pm
Stoker Coal Boiler: Harman VF 3000
Coal Size/Type: rice, bagged, Blaschak
Other Heating: Gas boiler backup/main
Stove/Furnace Model: VF 3000
Location: Chattanooga, Tenn

Post Fri. Jan. 31, 2014 11:17 pm

I am a proponent of the law of physics that states that the greater the temperature differential the greater the transfer rate. So, running a hot fire for shorter periods should be the most efficient. I want mine up to max temp as soon as possible.

Kevin

Visit Alternate Heating Sytems

danwesson623
New Member
Posts: 7
Joined: Mon. Jan. 27, 2014 7:01 pm
Stoker Coal Boiler: Keystoker ka-6

Post Fri. Jan. 31, 2014 11:34 pm

I think you are right. I have been trying to cut back on the coal feed to save coal but I am beginning to think the hotter the fire the better

User avatar
KLook
Member
Posts: 3636
Joined: Sun. Feb. 17, 2008 1:08 pm
Stoker Coal Boiler: Harman VF 3000
Coal Size/Type: rice, bagged, Blaschak
Other Heating: Gas boiler backup/main
Stove/Furnace Model: VF 3000
Location: Chattanooga, Tenn

Post Fri. Jan. 31, 2014 11:53 pm

Not sure where you are located but the guys in the more temperate areas(not so cold) can get away with things that others cannot. When it is cold, make heat. That is the only thing that works. I agree that pumping only enough heat to satisfy the demand for longer periods is better for comfort(shorter swings in temp from high to low) but to make the heat needed, getter done. Much is discussed about having oversized boilers that idle to much, and much is discussed about having undersized boilers that run to hard.

Kevin

Pacowy
Member
Posts: 2742
Joined: Tue. Sep. 04, 2007 10:14 pm
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite
Location: Dalton, MA

Post Sat. Feb. 01, 2014 1:02 am

If you have a hot water system my vote would be to run low and slow so the combustion gases are moving their slowest over the heat exchange surfaces. If you have a steam system my vote would be to run hard so the system spends the smallest possible amount of time making steam and the most possible time at rest.

Mike

Visit Alternate Heating Sytems

User avatar
oliver power
Member
Posts: 2266
Joined: Sun. Apr. 16, 2006 9:28 am
Stoker Coal Boiler: KEYSTOKER Kaa-2
Hand Fed Coal Stove: Hitzer 50-93 & 30-95, Vigilant (pre-Vigilant-II), D.S. 1600 Circulator
Baseburners & Antiques: MANY (Mostly when burning wood)
Location: Near Dansville, NY

Post Sat. Feb. 01, 2014 7:27 am

KLook wrote:Not sure where you are located but the guys in the more temperate areas(not so cold) can get away with things that others cannot. When it is cold, make heat. That is the only thing that works. I agree that pumping only enough heat to satisfy the demand for longer periods is better for comfort(shorter swings in temp from high to low) but to make the heat needed, getter done. Much is discussed about having oversized boilers that idle to much, and much is discussed about having undersized boilers that run to hard.

Kevin
I don't know as if it matters but, I'm with KLook. If demand is big, and you are going to need heat, you had better be making heat. Get ready for the next call from thermostat. If outside temps are higher, and the boiler doesn't need to be cranking, it will idle back anyways. Then the long slow idle fire will continue to build / store heat. And that's my opinion.

User avatar
Carbon12
Member
Posts: 2230
Joined: Tue. Oct. 11, 2011 6:53 pm
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace
Location: Harrisburg, PA

Post Sat. Feb. 01, 2014 8:41 am

I adjust my feed rate to provide just enough burn to satisfy the current load. If it's "warmer" outside, I back the feed rate down a little. If it's friggin' cold out, I set the feed rate to give 1 inch of dead ash on the grate. HOWEVER,....I seem to burn about the same amount of coal on a per degree day basis regardless of feed rate so I'm not sure adjusting the feed rate really accomplishes anything meaningful. I have noticed that coal consumption is not entirely linear. On warmer days I burn about 2 pounds per degree day. On colder days it's 2.5 pounds per degree day. This may have to do with the heat loss with greater differential between indoor and outdoor temperatures.
No matter where you go,......there you are.

User avatar
Wiz
Member
Posts: 926
Joined: Sun. Nov. 27, 2011 8:45 pm
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(
Location: Tannersville Pa

Post Sat. Feb. 01, 2014 8:54 am

I spent countless time on the same question asked. I've got answers comparing apples to apples ( Ka-6). Running boiler with the aggressive burn leaving 2 inch of dead ash during run time will be the BEST performance for ka6. Boiler will always be ready for any demand it calls for, set it leave it period. doing this is less unburnt. others will argue this point.
Randy
If you have time to make a post looking for free advice, then show some appreciation and say thank you.

Post Reply

Return to “Stoker Coal Boilers Using Anthracite (Hydronic and Steam)”