In many of the Scientific publications it was reported that biochar was produced in the muffle furnace at varying temperature. Stainless steel/aluminium box or in some cases crucibles with lid were used as container. There seems two problems: a) maintaining oxygen free conditions and b) release of syngas or separation of syngas and bio-oil from biochar.
1) How we can maintain oxygen free atmosphere in the muffle furnace.
2) What happen to the syngas and bio-oil produced during the pyrolysis process in box/ crucible. Doesn't it impact the quality of biochar in terms of its pore size, structure and surface chemistry?
Please have a look at this useful ResearchGate link.
https://www.researchgate.net/post/How_to_prepare_Biochar_in_lab_scale_muffle_furnace
Hi Nasser,
I am not familiar with that type of reactor but from my desk research I can maybe give you a hint about question nr 2.
If the gas is not stripped by N2 then the vapor residence time will be high. As the vapor residence time increases , repolymerization of biomass particles occurs resulting in elevater biochar yield.
Source- Article Effect of process parameters on production of biochar from b...
Hi Naseer,
Regarding on how can you maintain an oxygen free atmosphere in the muffle furnace, perhaps you could consider feeding an inert gas, e.g., nitrogen.
Rather than thinking that the syngas and bio-oil will affect the biochar is more the effect of temperature, gaseous environment, residence time and heating rate that will modify the pore size, structure and surface chemistry. Volatiles and bio-oil (if any, depending on the process conditions) are just products of the process. Thus, you will have to modify your operation conditions depending on the desired properties of the biochar.
Cheers,
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