Some of the details about the initial experiment:
The test firing used six, five gallon buckets of Wyoming soft coal, and the ash resultant was 1/2 of an ash bin. The air chamber was for the 200,000 BTU output stoker, but only a used 100,000 BTU pot was available. The maximum setting of coal feed was 5 teeth; about half the capacity of an efm stoker, without pushing coal over the top of the ring. The air setting was 8. The test stoker was unplugged at 10 pm and left to sit overnight unattended. At 7 am the next morning, it was plugged in again and the fire took off without the need of a Wil-burt timer. So, it held fire for 9 hours without any feed or air.
When the stoker was installed into an efm boiler, the resultant smoke in the chimney was the same as seen in the video; a small amount of white smoke. There was no need for any supplemental over-the-fire-air.
The best set-up was found to be the use of the S-20 efm stoker, with a Prill pot, and a 2 1/2" worm and pipe. This solved the problem of the various sizes of coal, as it is available in Wyoming, called stoker coal.
Last edited by stoker-man
on Thu Jul 31, 2008 11:15 am, edited 1 time in total.