What about simply buying a bag of cone 13 clay (refractory body), and forming your own riser liner? could be pressed, coil-pot style, between two pieces of pipe that have a 2" difference (6"dia and 8"dia, or 8"dia and 10"dia) such that you are left with a clay pipe with a 1" thickness. Firing the liner before installation would be ideal, but kilns of that size are problematic in location and use... still, they do exist. As an alternative, you could keep the liner in the two-pipes form, install it in a system, and have an initial "burn-out" phase wherein you intentionally burn out the first liner, thereby crudely firing the clay liner in place. Seemingly simple, this possibility has issues as well since the temperatures would vary greatly between the top and bottom
Matt Walker wrote:I'm sorry to say I doubt it's tough enough to handle what you have drawn there, unfortunately. It's still very clay rich, which means it doesn't go anywhere with the heat, but it powders fairly easily upon abrasion. Your sharp corners and metal grate area and all that just would eventually turn to powder with this mix. To build yours, I think you'll need to look to the premixed refractory blends or something along those lines. You could do something similar to my mix but with a lot more furnace cement, but at that point it would probably be more economical to just buy the good stuff.
What I've shared in the video is an improved mix over what I've been burning in my home for a year now. It's great for a basic J tube, the feed area cooks hard enough to handle the abuse, and if it wears it can be patched with a handful of more of the same. I don't think it will be appropriate for your complex design though. I could certainly be wrong though, I'm pretty good at that!
Shane McKenna wrote:... Not this brand. It is good stuff, but not meant for anything but insulation. It will tear, chip, and chunk-out if impacted, or rubbed against. Usually, it is protected by some other material. I don't think it would work well as the inside of the burn tube, however, that said, I think it might be a good substrate to cast onto and hold the shape until the clay is heat set.
Balint Bartuszek wrote:There is a similar design. But the owner had to modify the system so that the air supply cools the feed tube. Otherwise the fuel cooked in the tube. (complete with smoke and creosote in the pipe)
link for his page