AHS S130 Coalgun- Puffbacks & Explosions

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.
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Rob R.
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Posts: 11342
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sun. Oct. 21, 2012 12:43 pm

This talk about the volatiles is interesting...I have always preferred coal with a high volatile content for its easy starting and ability to hold a fire.

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lsayre
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Posts: 12185
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sun. Oct. 21, 2012 4:48 pm

Rob R. wrote:This talk about the volatiles is interesting...I have always preferred coal with a high volatile content for its easy starting and ability to hold a fire.
Rob, when you burned Lehigh, did it cause any problems due to its low volatility?
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Rob R.
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Posts: 11342
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sun. Oct. 21, 2012 5:00 pm

I didn't have any problems with it, but I only burned it in hand-fired equipment. I do remember that it was a little more sensitive to the "rules" of starting and maintaining an anthracite fire in a hand-fed unit. i.e. the coal bed must be 6" deep or more, you must cover the entire grate before starting a fire so no air can bypass the coal, and you must maintain a steady draft at all times.

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watkinsdr
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Posts: 242
Joined: Sat. Mar. 24, 2007 8:14 pm
Stoker Coal Boiler: AHS S260 Boiler
Location: Kensington, New Hampshire

Post Sun. Oct. 21, 2012 8:55 pm

I'm convinced this puff-back problem with AHS boilers is really easy to solve. You simply need to ensure there's an open flame to burn volatiles off before they can accumulate. Keeping the fire high enough in the sight tube area resolves this part of the problem; but, due to varying load, weather, etc., it's a pain in the butt to keep changing the PLC "set variable" to keep the fire high in the sight tube area.

Again, the existing AHS design is an open loop control system. Their design really needs to be changed to a closed loop control system; with, a second thermocouple monitoring (and keeping) the fire high in the sight tube area---but not so high you burn up into the storage hopper.

I had puff-backs with my S130---they were simply much smaller.

Gas volatiles occur naturally when when solid fuels transition through their kindling point and combust---this is a completely normal chemical process. No volatiles---no combustion---no heat. It's nonsense to contemplate and compare white ash, red ash, deep mined, strip mined, etc.
AHS S260 "BEAST" Burning Lehigh Pea Anthracite
Kensington, NH

pete6500
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Posts: 15
Joined: Wed. Sep. 14, 2011 8:38 pm
Stove/Furnace Model: AHS130

Post Sat. Oct. 27, 2012 5:46 pm

I run my ahs130 without a controller only the timer based grate shaker. As I posted some time ago as long as the fire is as high as I dare go there is no bangs.Now last spring after I cleaned out the hopper and all ash I decided to try something different. I bought a dwyer controller and thermocouple with my specs and put the thermocouple in the coal feed tube enclosed in a secondary protective sheath with the tip exposed. I can adjust the amount of travel of the t-couple in the feed tube just before the coal exits into the fire pot. This will give me some idea what kind of temps in that area. I plan to set the control to cooling cycle to turn on grate when temp goes to my high set value. The grate will run until the temp drops as fresh coal enters. I can then determine my diff. setting. This year for the first half of the heating season I'll be using the grate timer and only monitoring the temps with a log at which my fire is optimum with the controller readout. If I'm satisfied I'll switch over to the controller to operate the grate. With this setup it should also keep the fire from climbing into feed tube but still keep the fire high where I want it. watkinsdr mentioned a second t-couple. I 'm sure that would work too. We'll see what happens. Thanks

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McGiever
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Posts: 5997
Joined: Sun. May. 02, 2010 11:26 pm
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Coal Size/Type: PEA / ANTHRACITE
Other Heating: Ground Source Heat Pump
Stove/Furnace Make: Hydro Heat /Mega Tek
Location: Junction of PA-OH-WV

Post Sat. Oct. 27, 2012 7:18 pm

Sounds like a interesting experiment there *pete6500*. :idea:

Let us know what you find out. :!:
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dchartt
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Posts: 172
Joined: Fri. Sep. 02, 2011 5:22 pm
Stoker Coal Boiler: AHS 130
Hand Fed Coal Stove: Glacier Bay

Post Sun. Oct. 28, 2012 10:51 am

wonder if my ahs130 will take me into space and perhaps land me on the moon?

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lsayre
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Posts: 12185
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sun. Oct. 28, 2012 11:08 am

dchartt wrote:wonder if my ahs130 will take me into space and perhaps land me on the moon?
Doubtful. In my experience at least, puffbacks are way overrated. They are more like occasional brief whooshes. And with a bit of adjustment, you can make them all but completely go away.

Your mileage may vary though. Obviously the experiences of some of the forum members have been much more than just a mild whoosh.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Rob R.
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Posts: 11342
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sun. Oct. 28, 2012 1:01 pm

dchartt wrote:wonder if my ahs130 will take me into space and perhaps land me on the moon?
Doubtful, but your baro might make it into a low orbit.

dchartt
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Posts: 172
Joined: Fri. Sep. 02, 2011 5:22 pm
Stoker Coal Boiler: AHS 130
Hand Fed Coal Stove: Glacier Bay

Post Mon. Oct. 29, 2012 2:25 pm

mine did last year

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MATTHEW D.
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Posts: 238
Joined: Tue. Apr. 20, 2010 1:44 pm
Stove/Furnace Make: AXEMAN-ANDERSON & EFM
Stove/Furnace Model: 130 & 900 x 2
Location: Pottsville, Pa.

Post Wed. Oct. 31, 2012 9:17 pm

Haven't had time to read this thread but my AA130 has been blowing my baro across my garage for the last 6 months. Start happening when I switched from pea to buck? Today the puff back shook the house :!: I took the plug out of the sight hole cover as quoted from Axeman when you switch to buck. I think I need to drill more holes in it???? I'll read more of this thread to try to catch up to what you guys are talking about.................be back soon. MATT

Pacowy
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Posts: 2731
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 Wed. Oct. 31, 2012 11:53 pm

I'm happy not to have any experience in this area, but I'm concerned that what you're describing seems to have the potential to rupture the smokepipe. The joints on universal elbows are often pretty flimsy; a boom that shoots a baro across a garage seems like it could blow apart an elbow. Does that type of damage ever occur?

Mike

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Rob R.
Site Moderator
Posts: 11342
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Thu. Nov. 01, 2012 8:38 am

Pacowy wrote:I'm happy not to have any experience in this area, but I'm concerned that what you're describing seems to have the potential to rupture the smokepipe. The joints on universal elbows are often pretty flimsy; a boom that shoots a baro across a garage seems like it could blow apart an elbow. Does that type of damage ever occur?

Mike
Finally Up and Running With S-260

Far So Good After Tweaks to AHS S260

Pacowy
Member
Posts: 2731
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 Thu. Nov. 01, 2012 9:04 am

Hopefully the people who have these units in their houses are using heavy-duty and secured smokepipe components as described in those threads.

Mike

chevymatt
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Posts: 81
Joined: Sun. Sep. 11, 2011 1:51 pm
Stoker Coal Boiler: AHS S260
Location: Oneonta NY

Post Sat. Nov. 03, 2012 7:57 am

The links rob posted was my boiler that blew the chimney apart. It was scary when it happened but I learned a lot and hopefully my mishap has helped others. I'm on storm work repairing people's power but when I get home I have a pic from the puff back that shows one of the rings of the flex 90 stuck a 1/4" into a 2x6. It could have killed someone. Be careful everyone

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