Stoker bed coal depth?

Stoker bed coal depth?

PostBy: swyman On: Tue Jan 31, 2017 12:29 am

I have noticed inconsistencies in the depth of the coal on the stoker beds. One morning I'll check it and it will be just about to the top of the sides and the next morning it might only fill the bed half way if that makes and sense? Is there any way to control this? Mind you these changes take place with no adjustments. I think it makes a big difference in output if the bed is full.
swyman
 
Stoker Coal Boiler: Leisure Line AA-220

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Re: Stoker bed coal depth?

PostBy: Uglysquirrel On: Tue Jan 31, 2017 4:52 pm

Assuming we both have the same stoker (Pocono here) , the machine has demonstrated over a 6-7 year time frame a uniform never changing bed height that is 1.25" to 1.5" below the top edge of the grate. This is using Blaschak (totally dry) rice which has minimal fines.

This " 1.25"- 1.5" below top edge" height generally corresponds to the upper edge of the slot rearward of where the coal is dropped from the bin.

Several speculations could be proposed as why your issue is happening. It could involve the grate's increased surface roughness (erosion) under exceptionally hard long term running, also potentially some sort of clinking that is holding back the coal as well as coal particulate size differences that could hold back the coal from a reasonably smooth slide down the chute especially if the coal is wet (with considerable coal dust).
Uglysquirrel
 
Stove/Furnace Model: Pocono

Re: Stoker bed coal depth?

PostBy: swyman On: Wed Feb 01, 2017 12:15 am

[quote="Uglysquirrel"]Assuming we both have the same stoker (Pocono here) , the machine has demonstrated over a 6-7 year time frame a uniform never changing bed height that is 1.25" to 1.5" below the top edge of the grate. This is using Blaschak (totally dry) rice which has minimal fines.

This " 1.25"- 1.5" below top edge" height generally corresponds to the upper edge of the slot rearward of where the coal is dropped from the bin.
quote]

This is about where one of my stokers is at and the other is about 1/2" down from the top of the side. I am running dry Lehigh rice right now but getting ready to switch back to buck in the next 2 days. I have noticed this phenomenon last year also which is why I question it now. This is my 2nd season with a brand new AA-220 boiler so there is no wear on the stoker bed. I did a cleanout after burning 5 ton and to my surprise there were only about 5 plugged air holes between both stoker beds. Also as you stated I am getting "clinkers" but after further investigation it was determined that the coal is just "caking" since is breaks apart very easily and it has had some effect on consistency of feeding on the bed but not a show stopper. I will pay more attention to fine tuning once I get the buck back in there.
swyman
 
Stoker Coal Boiler: Leisure Line AA-220

Re: Stoker bed coal depth?

PostBy: Rob R. On: Wed Feb 01, 2017 6:54 am

The variability you are seeing is likely due to the clinkering of the ashes, or not, depending on how often/hard the stoker is running. If the boiler is heating the house and the fire looks reasonable I would not stress over it.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Stoker bed coal depth?

PostBy: 2001Sierra On: Wed Feb 01, 2017 10:35 am

Rob R. wrote:The variability you are seeing is likely due to the clinkering of the ashes, or not, depending on how often/hard the stoker is running. If the boiler is heating the house and the fire looks reasonable I would not stress over it.


I agree with Rob. On my Keystoker which is a flat plate design I notice when the demand for heat is high the ash bed runs deeper. When the demand is low the ash depth tends to run shallower.
2001Sierra
 
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

Re: Stoker bed coal depth?

PostBy: swyman On: Thu Feb 02, 2017 1:19 am

I will try and take better notice if the weather gets cold again??? Calling for more very mild temps for the next week. Switching to buck this morning so that will throw everything out the window again!
swyman
 
Stoker Coal Boiler: Leisure Line AA-220

Re: Stoker bed coal depth?

PostBy: blrman07 On: Thu Feb 02, 2017 6:33 am

swyman wrote:I will try and take better notice if the weather gets cold again??? Calling for more very mild temps for the next week. Switching to buck this morning so that will throw everything out the window again!


If your looking for everything to remain constant it's not going to do that. This is not a trip through physics where everything is consistant.
Enjoy the burn :D
blrman07
 
Hand Fed Coal Boiler: Bucket a Day
Hand Fed Coal Stove: Vigilant Casting 2310
Coal Size/Type: Pea/Nut/Wood in the VC and anything that will fit in the Bucket a Day. It's not fussy.

Re: Stoker bed coal depth?

PostBy: Rob R. On: Thu Feb 02, 2017 6:55 am

swyman wrote:I will try and take better notice if the weather gets cold again??? Calling for more very mild temps for the next week. Switching to buck this morning so that will throw everything out the window again!


The secret is to stop opening the door and looking at the fire. I understand that you will have to make some adjustments when you switch to buck, but once you make them just let it run.

blrman07 wrote: If your looking for everything to remain constant it's not going to do that.


If the thermometer in the house is remaining constant, all is well. :)
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Visit Leisure Line Stove

Re: Stoker bed coal depth?

PostBy: swyman On: Thu Feb 02, 2017 7:16 am

[quote="Rob R."]

The secret is to stop opening the door and looking at the fire. quote]

Who doesn't like watching a fire! Actually I bought the absolute worst coal burner in the industry for watching the fire........you just about have to stand on your head to see it! Guess those guys just designed it to make heat and it does that well! Been a really good year, kinda boring.
swyman
 
Stoker Coal Boiler: Leisure Line AA-220