[Stoves] Biomass Reactor Systems Was: Re: Fuel Testing

[Kevin Chisholm]

Dear AJH
>
....del...

> Paul has raised an interesting question about where the fixed carbon
> comes from, I'll see if I can provoke some further thought on this.
>
I think it is as simple as the following:

1: TLUD System:

Biomass + Primary Air ---> Char + Pyrolysis gases + Nitrogen

Pyrolysis gases are burned WITHIN the stove as follows:
Pyrolysis Gases + Secondary Air ---> CO2 + H2O + Nitrogen + Heat

Char is burned EXTERNALLY elsewhere as follows:
Char + Secondary Air ---> CO2 + Nitrogen + Heat

Products LEAVING TLUD System:
CO2 + H2O + N2 (Initially) + Char (At end) + Heat

2: Biomass Gasifier:

Biomass + Primary Air ---> Char + Pyrolysis gases + Nitrogen + Heat

Pyrolysis gases are reacted with the char  WITHIN the gasifier as follow:
Char + Pyrolysis Gases + Heat ---> Ash + CO + H2 + Nitrogen  (Ash + Gasifier
Gas)

Gasifier gas is burned EXTERNALLY as follows:
Gasifier Gas + Secondary Air ---> CO2 + H2O + Nitrogen + Heat

Products LEAVING Gasifier:
Gasifier Gas

3: Biomass Burning Stove:

Biomass + Primary Air ---> Char + Pyrolysis gases + Nitrogen

Pyrolysis gases are burned WITHIN the stove as follows:
Pyrolysis Gases + Secondary Air ---> CO2 + H2O + Nitrogen + Heat

Char is burned  WITHIN the stove as follows:
Char + Secondary Air ---> CO2 + Nitrogen + Heat

Products LEAVING a Biomass Burning Stove:
CO2 + H2O + Heat

4: Classic Charcoal Making Kiln System

Biomass + Primary Air ---> Char + Pyrolysis gases + Nitrogen

Pyrolysis gases are vented from the kiln and are not burned

Char is burned EXTERNALLY as follows:
Char + Secondary Air ---> CO2 + Nitrogen + Ash + Heat

Products LEAVING a classic Charcoal Kiln:
Pyrolysis gases + CO2 + H2O + N2 (Initially) + Char (At end) + Heat

This approach seeks to describe various "biomass reactor systems" in terms 
of their function and outputs.

Best wishes,

Kevin