pozarns wrote:Regarding the hopper fire issue....
My idea was to install a hinged "flap" at the entrace to the stoker where the carpet feeds the fuel. When the carpet retracts, it will create a barrrier between the burning fuel and hopper, thus preventing fires. Am I dreaming? I hate to pass up a good deal, but if it is truly not possible to burn other fuels, I could end up with a 500# paper weight.
I don't think you are dreaming, I would give it a try, I would try it without the flap first, but I bet the first thing you'll notice, that the feed motor would be too slow , coal burns slower, and the slow movement of the carpet is a good match for the burning of coal, the other factor is the weight, and that is matched with the thickness of the Carpet/slider.
in order for your project to succeed, most likely you need the pusher type stokers ( keystoker/Harman ) and somehow increase the feed rate, otherwise you are looking at far less BTU's output.
These are my educated guesses, but I think they have merits.
The good news are: you can find the same form factor motor with reduction gears that has a higher RPM, and you can always modify the carpet/slider easily.