do a google search on : pyrolysis mass flow analysis and see if that
helps you. i think it may well do so if you will spend some time reading.
regards,
ronald von den husten
On 23.04.2013 14:21, [email protected] wrote:
Literature:
When the wood is dry and heated to around 280°C, it begins to
spontaneously break down to produce charcoal plus water vapor,
methanol, acetic acid and more complex chemicals, chiefly in the form
of tars and non-condensable gas consisting mainly of hydrogen, carbon
monoxide and carbon dioxide. Air is admitted to the carbonizing kiln
or pit to allow some wood to be burned and the nitrogen from this air
will also be present in the gas. The oxygen of the air is used up in
burning part of the wood charged.The spontaneous breakdown or
carbonization of the wood above a temperature of 280°C liberates
energy and hence this reaction is said to be *exothermic*. This
process of spontaneous breakdown or carbonization continues until only
the carbonized residue called charcoal remains. Unless further
external heat is provided, the process stops and the temperature
reaches a maximum of about 400°C.
ADAM:
Comment: "exothermic" is still *a kind of mystery for me, *because I
often realized that If the wood chamber of a retort already heats up
to ~300°C -- still a lot of heat Is needed from *outside* to push
gasification.
I am really tempted to make a laboratory experiment. Place a piece of
oven dry wood in a small container, and place it in in electric oven
by 500°C., record the temperature inside the small container wood,
ideally the temperature should jump up more quickly above 280°C,
because of additional "exothermic" heat supplied from "inside the
wood-charcoal piece?
*But I don't recall to have seen such a jump in a plotted graph?Also
anyone has an idea about that"amount" of that expected "exothermic"
heat??*
THANKS Chris
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