Post
by lzaharis » Sat. Jan. 28, 2023 11:43 am
Hello K-2
Based on my experience with my current Intermatic 30-minute timer settings, the lower high limit temperatures of 170 degrees Fahrenheit high limit temperature, the low limit water temperature of 150 degrees Fahrenheit with the ten degree differential, the 190 degree Fahrenheit dump zone temperature with the ten degree differential plus the placement of the steel flat stock blocking 4 inches of the hoppers draw point I know you can save fuel, I have saved fuel, money and wear and tear on my coal stoker and my house is warmer.
My stoker motor, gearing and the pusher plate is straining much less from the reduced weight of the coal over the pusher plate as a narrower lighter rectangular weight of rice coal is dropping on the stokers pusher plate at all times.
I replaced my first koker stoker motor last year and I am still using the same combustion blower the boiler came with and I need to purchase a spare to have one on hand.
Based on my past experience by filling half the firebox volume to the breech of my old hand fed wood and coal boiler I will be lining the floor and dry walls of the stoker of the kaa-4-1 boiler with full firebrick to hold even more heat in the boiler which will absorb some of the heat created by the combustion of the rice coal and radiate this heat from the fire brick back into the fire box which will be absorbed by the 2 water walls and the dry walls of the boiler.
With the slower coal flow and my feed rate of 12 threads out I have a very small amount of coal that spills over the sides of the pusher plate and the fire roars when the stoker is operating on a heat call and the fire reaches the bottom of the steam chest.
I will be using 3 inch wide pieces of flat stock in the next heating season if not sooner to test the reduced fuel use using even less rice coal for fuel with my current settings.
If full firebrick mudded in with furnace cement the floor of the Axeman Anderson 130S and 260S I am sure the owners of these units will also save a great deal of Anthracite Pea Coal.
There is a very good reason the old hand fed coal boilers were filled full of firebrick.
I will have fallen off my soap box by now :^)