This looks promising. Despite being actively involved in making biochar for years, I can't really say that I have effectively managed to use the heat for a very useful purpose. I experiment with cooking small vegetables, but I am intrigued by the possibilities that some of you have developed. Thanks for posting. As H. Ross Perot would say, show me what you got-I'm all ears!
Ive cast a heat riser from perlite and calcium aluminate cement.
Despite motor oil and and plastic, it does not want to release.
Its probably to dense anyway, with too much cement too little perlite, too thick altogether.
With a lot of finangling I able to remove massive heat riser from the boiler.
I may try a refractory heat riser again in the future,but its one innovative to far right now.
I will replace it with a steel can, or perhsps a stainless steel bain marie with the bottom cut out.
Mean while I have a prop for a B.C. comic and I've added legs to the boiler.