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<DIV><FONT size=2 face=Corbel>We have found that many smaller plants use a
floating dome to hold the gas. It is fairly</FONT></DIV>
<DIV><FONT size=2 face=Corbel>effective to use lime water as the liquid under
the dome and bubble the gas through it.</FONT></DIV>
<DIV><FONT size=2 face=Corbel>Much of the CO2 is removed and takes up less
volume in the dome.</FONT></DIV>
<DIV><FONT size=2 face=Corbel></FONT> </DIV>
<DIV><FONT size=2 face=Corbel>Our primary concern is H2S. It deteriorates the
steel containers many have used and </FONT></DIV>
<DIV><FONT size=2 face=Corbel>posses a safety hazard.</FONT></DIV>
<DIV><FONT size=2 face=Corbel></FONT> </DIV>
<DIV><FONT size=2 face=Corbel>You can compress almost any gas
or liquid with almost no energy input if you have a deep shaft</FONT></DIV>
<DIV><FONT size=2 face=Corbel>or a small mountain. Mix the gas and liquid
together and feed it into a very strong pipe that </FONT></DIV>
<DIV><FONT size=2 face=Corbel>in unaffected by H2S. When the mixture is at the
bottom of the pipe the pressure is approximately</FONT></DIV>
<DIV><FONT size=2 face=Corbel>one PSI for every two feet it has traveled down
the pipe. At the bottom separate the liquid from the</FONT></DIV>
<DIV><FONT size=2 face=Corbel>gas and you have
two power sources. We use this method to compress gas
</FONT><FONT size=2 face=Corbel>for gas turbine generators.
</FONT></DIV>
<DIV><FONT size=2 face=Corbel>One of the weaknesses of gas turbines is the
necessity to compress the fuel.</FONT></DIV>
<DIV><FONT size=2 face=Corbel>The compressors rob power from the turbine
lowering power output. </FONT></DIV>
<DIV><FONT size=2 face=Corbel></FONT> </DIV>
<DIV><FONT size=2 face=Corbel>Location is the key, not everyone lives next to a
mountain or a deep cave, but the gas or pressurized </FONT></DIV>
<DIV><FONT size=2 face=Corbel>liquid can be piped long distances because it is
pressurized for almost nothing. You can use this</FONT></DIV>
<DIV><FONT size=2 face=Corbel>method to replace steam in stationary steam
generators or hydraulic motors. You are only limited</FONT></DIV>
<DIV><FONT size=2 face=Corbel>by your imagination: your choice of the gas and
liquid.</FONT></DIV>
<DIV><FONT size=2 face=Corbel></FONT> </DIV>
<DIV><FONT size=2 face=Corbel>Brent</FONT></DIV>
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style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=alex@sistemabiobolsa.com
href="mailto:alex@sistemabiobolsa.com">Alexander Eaton</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=digestion@lists.bioenergylists.org
href="mailto:digestion@lists.bioenergylists.org">For Discussion of Anaerobic
Digestion</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 23, 2010 9:58
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Digestion] Compressing of
biogas</DIV>
<DIV><BR></DIV>We go around this issue frequently, as end users often come up
with the same idea. It is hard to tell them no, so we always take a
fresh look under the circumstances. At the end of the day filtration of
CO2 i always ruled out, and that means 40% of the volume of gas you are
compressing serves no energetic purpose. Add that to the fact that
methane does not like to be compressed, and we arrive again at a "no"
response. <BR><BR>The one option we always examine is the non-compressed
transportation of large gas reservoirs. This we have tried for distances
that are too long for a simple gas line, and short enough to be practical by
cart. Since we can make durable gas reservoirs of any size and shape,
this is not unfeasible. Once transported, the gas is connected and used
as usual, while a second reservoir is filling. If you can create value
for this use, and the transport logistics to not out-weight the value of the
energy provided, you may have an option for success. Others have used
large truck inner-tubes in the same way, that are then rolled down the street
to the end use. I suspect that in certain locations, systems that
considered low-pressure distribution could gain some traction.
<BR><BR>Saludos,<BR><BR>A <BR><BR>
<DIV class=gmail_quote>On Tue, Nov 23, 2010 at 6:21 AM, Vianney Tumwesige
<SPAN dir=ltr><<A
href="mailto:trustvianney@gmail.com">trustvianney@gmail.com</A>></SPAN>
wrote:<BR>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0pt 0pt 0pt 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>Hello Harold,<BR><BR>I completely agree withYvonne, it
will be economically expensive to compress the gas.<BR><BR>P.S. Yvonne,
could you send me a copy of the paper and ppt as well? <BR><BR>Best
regards<BR><BR>
<DIV style="DISPLAY: inline"></DIV>
<DIV class=gmail_quote>
<DIV>
<DIV></DIV>
<DIV class=h5>On Tue, Nov 23, 2010 at 1:49 PM, Harold leffertstra <SPAN
dir=ltr><<A href="mailto:haroldleffertstra@yahoo.no"
target=_blank>haroldleffertstra@yahoo.no</A>></SPAN>
wrote:<BR></DIV></DIV>
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class=gmail_quote>
<DIV>
<DIV></DIV>
<DIV class=h5>
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<DIV>hello</DIV>
<DIV>Got a question from the owner of a small biogass plant in
Tanzania.</DIV>
<DIV>He is expanding a small existing biogas plant to be able
to digest waste from 200 households and manure from 100
cows. </DIV>
<DIV>He is interested in using the biogas for fueling
vehicles. In our part of the world we think it will be
necessary with cleaning, uppgrading of the gas and
compressing.</DIV>
<DIV>Do any of you have experience/ideas about whether this is
feasible for such a small plant?</DIV>
<DIV>1)What is necessary to use the biogas for fueling
vehicles and 2) what are the technical and economical
consequences?</DIV>
<DIV>Thank you</DIV>
<DIV>Harold Leffertstra</DIV>
<DIV>Senior Advisor</DIV>
<DIV>Norwegian Climate and Pollution Agency</DIV>
<DIV>Oslo </DIV></TD></TR></TBODY></TABLE></DIV></TD></TR></TBODY></TABLE><BR><BR></DIV></DIV>_______________________________________________<BR>Digestion
mailing list<BR><BR>to Send a Message to the list, use the email
address<BR><A href="mailto:Digestion@bioenergylists.org"
target=_blank>Digestion@bioenergylists.org</A><BR><BR>to UNSUBSCRIBE or
Change your List Settings use the web page<BR><A
href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org"
target=_blank>http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</A><BR><BR>for
more information about digestion, see<BR>Beginner's Guide to Biogas<BR><A
href="http://www.adelaide.edu.au/biogas/"
target=_blank>http://www.adelaide.edu.au/biogas/</A><BR>and the Biogas
Wiki <A href="http://biogas.wikispaces.com/"
target=_blank>http://biogas.wikispaces.com/</A><BR><BR><BR></BLOCKQUOTE></DIV><FONT
color=#888888><BR><BR clear=all><BR>-- <BR>Vianney Tumwesige<BR>
<DIV style="DISPLAY: inline"></DIV>
<DIV style="DISPLAY: inline"></DIV>Director - Green Heat (U) Ltd <IMG
alt=Picture src="" width=20 height=20><BR>P.O. Box
10235<BR>Kampala-Uganda<BR>256 (0) 71 237 9889<BR>
<DIV style="DISPLAY: inline"></DIV><BR>"The more people are self sufficient
in cooking fuel, the more personal and financial freedom they have." - Emma
Casson<BR>
<DIV style="DISPLAY: inline"></DIV><BR><A
href="http://trustvianney.wordpress.com/" target=_blank><BR></A>
<DIV style="DISPLAY: inline"></DIV>
<DIV
style="DISPLAY: inline"></DIV><BR></FONT><BR>_______________________________________________<BR>Digestion
mailing list<BR><BR>to Send a Message to the list, use the email
address<BR><A
href="mailto:Digestion@bioenergylists.org">Digestion@bioenergylists.org</A><BR><BR>to
UNSUBSCRIBE or Change your List Settings use the web page<BR><A
href="http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org"
target=_blank>http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org</A><BR><BR>for
more information about digestion, see<BR>Beginner's Guide to Biogas<BR><A
href="http://www.adelaide.edu.au/biogas/"
target=_blank>http://www.adelaide.edu.au/biogas/</A><BR>and the Biogas Wiki
<A href="http://biogas.wikispaces.com/"
target=_blank>http://biogas.wikispaces.com/</A><BR><BR><BR></BLOCKQUOTE></DIV><BR><BR
clear=all><BR>-- <BR>Alexander Eaton<BR>Sistema
Biobolsa<BR>IRRI-Mexico<BR>RedBioLAC<BR><BR>Mex cel: (55) 11522786<BR>US cel:
970 275 4505<BR><BR><A href="mailto:alex@irrimexico.org"
target=_blank>alex@irrimexico.org</A><BR><A
href="mailto:alex@sistemabiobolsa.com"
target=_blank>alex@sistemabiobolsa.com</A><BR><BR><A
href="http://sistemabiobolsa.com" target=_blank>sistemabiobolsa.com</A><BR><A
href="http://www.irrimexico.org" target=_blank>www.irrimexico.org</A><BR><A
href="http://www.redbiolac.org" target=_blank>www.redbiolac.org</A><BR><BR>
<P>
<HR>
<P></P>_______________________________________________<BR>Digestion mailing
list<BR><BR>to Send a Message to the list, use the email
address<BR>Digestion@bioenergylists.org<BR><BR>to UNSUBSCRIBE or Change your
List Settings use the web
page<BR>http://lists.bioenergylists.org/mailman/listinfo/digestion_lists.bioenergylists.org<BR><BR>for
more information about digestion, see<BR>Beginner's Guide to
Biogas<BR>http://www.adelaide.edu.au/biogas/<BR>and the Biogas Wiki
http://biogas.wikispaces.com/<BR><BR></BLOCKQUOTE></BODY></HTML>