K6 Rice coal burning to hot?

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Adam
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Joined: Mon. Dec. 30, 2019 11:01 pm
Stoker Coal Boiler: K6
Baseburners & Antiques: Radiant/baseboard
Coal Size/Type: Rice

Post by Adam » Mon. Dec. 30, 2019 11:08 pm

I have a k6 stoker. Heating a 2 story home and garage. I’m currently 13 turns out. I have my air down to nothing and yet the coal is burning so hot it is caking and not sliding down very well. Any thoughts ideas? Also 2 pins every 15 mins . Also using the k6 for my DHW.

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

Post by Rob R. » Tue. Dec. 31, 2019 6:16 am

Welcome.

Are you adjusting the main air flap? Or only the one on the secondary flower that runs all the time?

 
Adam
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Posts: 6
Joined: Mon. Dec. 30, 2019 11:01 pm
Stoker Coal Boiler: K6
Baseburners & Antiques: Radiant/baseboard
Coal Size/Type: Rice

Post by Adam » Tue. Dec. 31, 2019 7:15 am

I have my secondary blower completely shut. My main blower neck down just about as much as it will go.

 
Rob R.
Site Moderator
Posts: 14089
Joined: Fri. Dec. 28, 2007 4:26 pm
Location: Chazy, NY
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Post by Rob R. » Tue. Dec. 31, 2019 7:34 am

You can try increasing the feed, but it sounds like you got some coal that is prone to creating clinkers. I would try different coal.

Visit Alternate Heating Sytems

 
Adam
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Posts: 6
Joined: Mon. Dec. 30, 2019 11:01 pm
Stoker Coal Boiler: K6
Baseburners & Antiques: Radiant/baseboard
Coal Size/Type: Rice

Post by Adam » Tue. Dec. 31, 2019 11:00 am

Yeah I think I will unfortunately I bought 5 ton for the year so guess I’ll work threw it for this winter.

 
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PRengert
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Joined: Thu. Jan. 20, 2011 11:47 am
Location: Livingston county, NYS
Stoker Coal Boiler: Keystoker K6

Post by PRengert » Tue. Jan. 14, 2020 8:58 am

I had that problem (Lehigh coal). I used duct tape to close off the primary air more than the flapper would allow (there is a big hole where the shaft for the gear reduction box goes through). Also closed the secondary blower way down and reduced the feed rate. Keystoker recommended mixing in some buck to resolve things. Looks like the right mix is about 30% buck based on what I am seeing this year. You might want to shut down and sand the grates just in case you have some rough spots.

 
Adam
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Posts: 6
Joined: Mon. Dec. 30, 2019 11:01 pm
Stoker Coal Boiler: K6
Baseburners & Antiques: Radiant/baseboard
Coal Size/Type: Rice

Post by Adam » Sun. Jan. 19, 2020 11:25 am

I took advantage of the warmer weather last week. Shut down sanded my grates fired back up and is working (better) still clinkering but not as bad. It is enough to drive a guy crazy. I did the same thing with the duck tape. I know have the tape off and back to my normal air settings. Might change where I get my coal next year.

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