Sunny Boy wrote:
That's pretty slick William. Yeah, over 100 years ago, they sure knew a thing or two about burning coal didn't they ?
Makes me think about somehow incorporating a steel secondary air tube into the top of my 118 firebrick when I get around to re-lining the pot. Or, passageways cast into the firebrick from a heated air source like the ash drawer ? Like that parlor stove with vertical channels cast into it, that I if I remember correctly, you posted about a week ago ?
Like the old say, "There's nothing new under the Sun."
a coal fire will only produce enough gas to burn when a new load of coal is initially put on, once it begins to burn through, there's not enough methane gas produced to ignite. This usually occurs when the red coal level reaches the surface of the coal batch, there's not enough gas being produced to burn.
modern stoves with the fixed glass vents, burn off the methane in a similar fashion, across the top of the coal bed, until there's no gas left. You really don't need a secondary air metering tube- all you need is a fixed slit air vent in the front upper door, to feed constant air over the fire in a metered amount. It will light off and burn by itself as it rises off the fire.
With the Harman I when I get up at around 5-6 AM, and the house is still dark with no lights on, I can turn the main draft knob a 1/4 turn either way open and closed, and the blue gas flames on the coal fire will go up and down with the draft adjustment, just like a natural gas or propane kitchen stove will on the burners. It's kinda neat to watch, and it's amazing that draft knob has that kind of precise control. I was watching this phenom this morning and it never ceases to amaze me.