Jan and Bill,
Here is a photo of a charcoal unit built in a propane tank that uses a 1" nozzle. Run time 1/2 hr. to 45 min, but very easy to add more char via the stainless Baine Marie. I built this in 2012. If you put some slightly moist charcoal in a sealed can, and it is dry, there will be no condensation on the underside of the lid. If so, wipe it off, close the lid, and repeat. Dry char lights quick, and the flare will too. To much moist char makes too much steam in the flare. Water vapor is less dense than dry air, so the water rises, like clouds, to the top.
A 1" dia. steel pipe nozzle wrapped in stainless steel eventually melted into the slag, and was replaced and then wrapped in ceramic insulation, and the whole thing inserted into a ceramic coffee cup with a 1" outlet.
I have since made several more spare nozzles using castable refractory around the pipe with a TIG nozzle at the end. When refilling the hopper, I ran a steel rod downward to break up any void over the cup, and accidentally hit and cracked the coffee cup, but it works nevertheless, even with the crack because the ceramic wool is still there. Without water drip, just make a bunch of spare nozzles. The main problem with my propane tank set up is the nozzle is only accessible via the hopper, and my hand barely fits, plus all the char and slag need to be removed and screened.