We get some ash production right at the interface. But if there is a thick bed of char, which there is by the end of the burn if it is going correctly, then air (oxygen) cannot penetrate much up into the hot char.
Hi Josh, I changed my kontiki kiln the way you did and tested the char on filtering red raspberry juice as an experiment to my daughter's class. I did not yet measure the temp during gasification but it glowed red and was very hot run. We built the filter in a plastic coca cola buttle, filled with only the crushed char. The juice after filtration became totally transparent and clear water. Another advantage is the option to drink this water and test if sweet taste is left. I can sent you few pictures if you like. Thanks!
Does the grate on the bottom not cause excessive ash production in later stages of the burn? Or do you close it off with mud before that happens?
I typically start my pyramid kiln burns by building a platform of biomass about halfway up in the kiln to ensure very hot burn from the start.
We get some ash production right at the interface. But if there is a thick bed of char, which there is by the end of the burn if it is going correctly, then air (oxygen) cannot penetrate much up into the hot char.
Hi Josh, I changed my kontiki kiln the way you did and tested the char on filtering red raspberry juice as an experiment to my daughter's class. I did not yet measure the temp during gasification but it glowed red and was very hot run. We built the filter in a plastic coca cola buttle, filled with only the crushed char. The juice after filtration became totally transparent and clear water. Another advantage is the option to drink this water and test if sweet taste is left. I can sent you few pictures if you like. Thanks!
What a great visual demonstration! That is a good idea - I'll have to remember it for a demo sometime. For sure send pics and stories!
I sent it to your email.