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<DIV><FONT face=Arial size=2><STRONG>Hi Ben,</STRONG></FONT></DIV>
<DIV><FONT face=Arial size=2><STRONG></STRONG></FONT> </DIV>
<DIV><FONT face=Arial size=2><STRONG>You ask:</STRONG></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>>I do not post to this list much, but I enjoy
reading it, it is very helpful too me, thank you. <BR>>I have been
thinking about filtration of gas, and ways too do this. Given a tar
free gas, and the ability to cool and dehumidify it to a reasonable
degree; I am looking at ceramic filter >candles, and wondering with the
large range of these that are available for water filtration if any of these are
suitable or more suitable for wood gas? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><STRONG>Kevin has already offered advised about
using ceramic water filters, and I am not aware of any other ceramic filters
that are porous enough as a cheap alternative to the real thing. As far as I can
establish, only Gosfume </STRONG><A
href="http://www.glosfume.com/show_pic.php?id=big_home_1&alt=Hot+Gas+Filtration+Systems+-+Installing+Ceramic+Filters">http://www.glosfume.com/show_pic.php?id=big_home_1&alt=Hot+Gas+Filtration+Systems+-+Installing+Ceramic+Filters</A> </FONT></DIV>
<DIV><FONT face=Arial size=2><STRONG>in the UK make them specifically for
gaseous flows. From memory, we use about 76 of them in our Andes Class Gasifier
development programme in California, but they require compressed pulsing from
time to time when they reach 8"WG.</STRONG></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><STRONG>Being wood gas, you will find that filter
bags are very difficult to use due to the high moisture content, and it is
difficult to prevent condensation in the bags during start-up, which saturates
the filter cake. Even if you cyclone the gas, there will be all the particulates
over 10 micron still in the gas, and this is the stuff to catch before the dew
point of the condensate. Bags are OK for charcoal gasifiers, as they do not
usually have condensate unless over supplied with steam.</STRONG></DIV>
<DIV> </DIV>
<DIV>As my work is on a small scale and on a budget, I am of course looking for
solutions that exist in industry that are easy to adopt rather than coming up
with something new.</DIV>
<DIV> </DIV>
<DIV><STRONG>You might like to take this idea and run with it. I have
always wanted to try and use the waste charcoal crushed to some small even size,
and mix it with a bonding agent to</STRONG> <STRONG>make a domed construction of
large surface area. I imagined that I might have to bake it in an oven, which
would harden it off to make it quite robust. Any takers??<BR><BR>Hope this
stimulates some creativity of practical value, because filtration needs a nudge
in the right direction for this application.</STRONG></DIV>
<DIV><STRONG>Doug Williams,</STRONG></DIV>
<DIV><STRONG>Fluidyne</STRONG>.</FONT></DIV></BODY></HTML>