The triple skinned experimental producer is on hold while I chase some cash for sensors and test equipment - in the meantime I've set myself the goal of making a simple Imbert style gas producer using only stuff that was laying around the workshop, no fabricated tubes or expensive inputs beyond the stainless steel tubes and bends that the scrap dealer gave me
The shell is a standard household LPG bottle, the hearth is the flange end of some old water mains pipe and it will have a drop in restricter that can be changed to suit various needs, along with a single downtube air inlet that can also be changed out for different requirements.
Cut top to suit hearth
Drop hearth in and weld, but...
...let 30 or 40mm project inside
weld in tangential gas outlet
hearth "ring" will sit below outlet
use waste heat to preheat incoming air
split larger bend for easy assembly
putting the jigsaw together, gas outlet on the right
square air inlet sits loose on the pipe and will be welded to the hopper, it will have a flap to let air in but not out
removable monorator shell made from 330mm dia' auto lpg tank
Monorator shell slips over hearth and through channel ring. Ring is welded to hopper and fits tight to shell