[Gasification] Pyrolytic gasifiers

[Paul S. Anderson]

Again to the Stovers and GasL members,

Mr Hao in China has a stove that is extremely like the T-LUD gasifiers (ala
Reed, Anderson, Belonio, and others), except that it is not top-lit but has a
well-closed top to the fuel container, meaning primary air will not leak in
from the top.

According to the discussion and what I saw with Mr Hao, the ignition is via a
side-hole near the bottom, and draft of gases outward via a 4 centimeter hole
in the top can be further constricted.  So, the heat inside should be making
pyrolysis gases (smoke), and not supporting a typical burning pile of wood nor
what is traditionally understood as an "updraft gasifier."

Something similar to this was shown (I think) at ETHOS 2005 by a Chinese
participant.

My question is:  When the unit has been started and is functioning normally, the
primary air will enter into an area of charcoal that was created in the initial
minutes.  Will the oxygen of the limited air be all or mostly taken up by the
hot carbon (becoming CO or CO2??), and will that favor or hinder the desired
pyrolysis  process of the remaining raw biomass?

Is it correct and important to distinguish this pyrolytic (bottom-lit) updraft
gasifier from the more traditional updraft gasifiers that are bottom burning
but are doing carbon gasification as well as the pyrolytic gasificaton?  If
yes, is there an accepted terminology already?

I ask with true serious-ness, if T-LUD has a sister named B-LUD, what is their
"family name" and would B-LUD be known as a pyrolytic gasifier and NOT lead to
any confusion with the historically traditional updraft gasifiers (carbon
gasifiers) that are also bottom lit?

And are there any other forms of "pyrolytic gasifiers?"

Paul


-- 
Paul S. Anderson, Ph.D., Geography professor - Emeritus
Telephone:  USA-309-452-7072 (residence and office)
Internet site:  www.ilstu.edu/~psanders
For my gasifier stoves info, go to:
http://bioenergylists.org/contributors#Paul_Anderson





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