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<DIV><FONT face=Arial size=2><STRONG>Hi Luke,</STRONG></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Doug,<BR>you wrote,<BR>the Mk2 Mega Class gasifier
was able to make enough gas to supply nine of these engines flat out, so testing
one at a time placed no stress on the gas supply. <BR><BR><STRONG>This is the
output of the gasifier working at the top end of it's output for a base load
application. Actually, the Mk2 could make a lot more gas than this, but fuel
supply was a major issue at that development site, so was cut back to more
manageable consumption.</STRONG></FONT></DIV><FONT face=Arial
size=2><STRONG></STRONG>
<DIV><BR>How do they achieve this kind of turndown ratio, apparently at least
nine to one?</DIV>
<DIV> </DIV>
<DIV><STRONG>The design for this series of gasifiers, had
parameters matched to produce the optimum quality gas for engine powered
electrical generation on base load. Not many 2 MWe engines operating in a
variable load application on producer gas, but if the specifications called for
a turndown capability, depending on the duration of the turndown, one might use
two smaller gasifiers set up in parallel, and switch one off for lower
outputs. </STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>For testing these small engines, the gas was drawn from the total
output which was being flared in a combustion oxidation chamber, then into a
stack. If you have not seen this, you can review the Mega Class reports up to
February 2008 on the Fluidyne Archive <A
href="http://www.fluidynenz.250x.com">www.fluidynenz.250x.com</A> </STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>Gasifier turndown ratios are like any other specification set to
some yardstick, so care must be taken when reviewing literature or any
other persons results. The fuel plays a key role for stable gas making in most
downdraft systems, and the turndown determined by either gas analysis, or
more simple observations, like tar beginning to form in both the engine
manifolds and gas cooling condensates.</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>Hope this explains things missed out first time(:-)</STRONG></DIV>
<DIV><STRONG></STRONG> </DIV>
<DIV><STRONG>Doug Williams,</STRONG></DIV>
<DIV><STRONG>Fluidyne. <BR></STRONG><BR></DIV></FONT></BODY></HTML>