I have an Anchor stoker, very simular to Will-Burt underfeed Bituminous Stokers.
The next advancment is the adition of the rotating ring around the grate shaped like a circle, breaks any clinker and keeps the grate burning clear. Prill, Coal King, ect.
I've heard of overfeed heads that went on units like mine these essentally replaced the wind box and twyers with a grate located below the auger with air coming from below, similar in concept to the KeyStoker line, feeding onto a sloped grate, except I have a 3" auger, instead of a pusher block. A cutaway view of the Liesure line looks similar to my underfeed, pushing up past a grate.
Found this abstact on the web http://www.ags.gov.ab.ca/publications/a ... EP_46.html
I think I found the artical one night, discusing efficiancy and claiming better Nox output, I'm looking for the ash to fall off the grate and into a pit or drag chain, currently I need to clear ash from around my underfeed twyers twice a day, high ash coal, this always results in some coal and smoke getting out of the fire box, stinks up the garage ect.
Who has experiance with an overfeed stoker in the 30#/hr range with 7,500 BTU/lb coal ?
I'm thinking about building an overfeed head for my spare parts stoker, using grates form Hern Iron works or possibly KeyStoker, any sugestions on grates ?
I'm not talking about the Detroit moving grate overfeed stoker, those are million BTU and up.