I decided to build a clean out near the bottom of the gasifier so I can clean clinkers out from time to time. After emptying the unit out I took this picture of the nozzle with 157 miles on it. It still looks very good.
This 4 inch pipe coupling with a brass clean out plug cut on an angle will be welded on and I am hoping to be able to find clinkers by feel and remove them without emptying the charcoal.
I also plan on insulating the bottom 10 inches of the reactor with 2 inch thick ceramic blanket to make the shell cooler and keep the heat where I want it.