sawdust artist wrote:Just learning how to run this thing. So far I'm impressed. I was wondering if my ash quality is normal or if I'm putting out too much unburned coal. The black ash that is remaing looks kinda like wood coals with cracks but it is still hard, is there any heat remainging in that stuff? Boiler is located in an outdoor insulated shed that stays above 60 degrees with the heat off the boiler. Ashing temp set at 110 degrees. These pictures of ash are after 2 days of 17 degrees and windy.
I am heating about 7000 sq ft. House 3 floors, garage, and shop.
I'm new to this posting thing also, got my pictures in the wrong order.
After vigorously rubbing thru 1/2" X 1/2" screen.
Fine powder shaken out thru screen.
The way it comes from under boiler
My Rice Coal ash in my KAA-4-1 looked exactly like that until I changed the timer settings to 2 minutes at 15 minutes and 2 minutes 15 seconds at the 30 minute mark on the 30 minute Intermatic Timer. I realise this is for my keystoker but it has worked and I fill an ash basket in three days on average in milder weather.
ON a heat call I get the wide open burn with a one inch band of ash falling off the stoker and 3 inches of burning coals during a heat call with the blue flames reaching the steam chest and 3 inches of un burned coal with the dancing blue ladies coming off the rice coal that is being pushed to the fire bed.
I have had a consistant hold fire with no out fires since I changed the water temperatures and the pusher plate stroke.
Rehandling it and screening what you think is good coal it only leads to out fires, been there done that, and that is why I gradually slowed the feed rate to 9 plus threads on the stokers pusher plate and reduced my low limit to 120 and my high limit to 150 with a 15 degree differential leaving my dump temperature at 180.
If you can change your water temperature settings to a lower temperature gradually over time like I did I think you will see a huge difference in ash condition as the fiure will burn hotter and longer when needed and when the system is satisfied it will keep up and you will have a finer more burned ash. In my saying that the boiler will cycle more but the coal ash will be much better with little to any un burned coal in it.
I would slow the feed rate down and reduce your high and low limit water temperatures.
By doing that all you need to do is push up the thermostat to make heat and the stoker will
always be working and keeping a hot fire which will make a finer more burned coal ash.
I have had complete success with these lower settings now that I have thrown the Hydrostat 3250 Plus digital controls to the curb and replaced them with Honeywell controls and a B+G RB122-E Low Water Cut Off.
Do you have a direct drive combustion fan or the belt driven option? A lot of the AHS owner folks have had issues with the direct drive units failing due to excess heat apparently.