[Stoves] [Biochar] Energy utilization from process

[Crispin Pemberton-Pigott]

Dear Paul

>> They discuss "producer gas" and "The main product of the gasification-based or top-lit updraft (TLUD) cookstoves is the fuel gas, (18)<javascript:void(0);> whose thermochemical process is conducted similarly to the downdraft reactors. (19)<javascript:void(0);>"

>PSA:  That is not true.    The error is continued in their Figure 14:  Where they show oxidation zones and reduction zones above the pyrolysis zone, which would be the UP draft representation of what is in DOWN draft gasifiers which are designed to CONSUME the charcoal to make CO, not preserve the charcoal that can be called biochar.

I cannot find anything wrong with the description in Figure 14. What is the complaint?  Any gasifier can be made to create char by altering the air feed rate.

A downdraft reactor with fuel added continuously or episodically from above like the 350 kW one at YDD, Yogyakarta, is quite different from the Indian style updraft reactor made for decades by Hirendra Chakrabarti where the fuel is also fed from above.  There is a significant difference in the energy of the gas (in the latter case it is higher).  Essentially you choose which gas composition (and treatment you want to do) by picking one of those approaches.

Regards
Crispin

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