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

[Kevin Chisholm]

----- Original Message ----- 
From: "AJH" <list at sylva.icuklive.co.uk>
To: "Kevin Chisholm" <kchisholm at ca.inter.net>
Cc: <stoves at listserv.repp.org>
Sent: Monday, October 09, 2006 6:15 PM
Subject: Re: Biomass Reactor Systems Was: Re: [Stoves] Fuel Testing


On Sun, 8 Oct 2006 23:37:45 -0300, Kevin Chisholm wrote:

>>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.

> but misses the point as to which part of the biomass the remaining
char actually originated from.

True, but the above approach was simply intended to categorize various 
reaction systems, and not to explain the reason for different char yields 
attained with different biomass feedstocks.

Best wishes,

Kevin

> AD Karve has given us an insight that
char from paper (taken to be nearer to cellulose than wood) yields 30%
at a temperature where we would expect wood to yield nearer to 45% of
the dry matter. In fact I have seen a graph from research by Beall et
al in 1974 that quite plainly does show the that lignin contributes
most then hemicellulose and the char from cellulose is under 10% of
the initial weight of cellulose by 600C.

AJH