[Gasification] OT - Six Stroke Engine

[gfwhell at aol.com]

We should check out USA patent 887989,  to see how the engineers of yesteryear,  managed to upgrade the performance of their engines,  when running on rubbish gas! 
The re-addition of carbon to the exhaust gas can be "re burned". It might behoove us to add such additions to  the  system already employed on our "Emission control" paraphernalia ?

And will some one please do the Math on US patent 5,159,900 and let me know what the energy input is?

GF 

-----Original Message-----
From: doug.williams <Doug.Williams at orcon.net.nz>
To: Discussion of biomass pyrolysis and gasification <gasification at listserv.repp.org>
Cc: Jim Fournier <jim at planetwork.net>; agua Das <aguadas at onebox.com>
Sent: Sun, 10 Jun 2007 1:13 am
Subject: Re: [Gasification] OT - Six Stroke Engine



Hi Tom R, and Colleagues
Tom, you raise an interesting observation:
>I know that there are statements that  the flame speed of producer gas
is low compared to gasoline, and that it requires a slower turning engine.
You will find this confirmed with all the necessary formulas, in the FAO 
ublication Wood Gas as an Engine Fuel.
ttp://www.fao.org/DOCREP/T0512E/T0512e00.htm
he information in this book was edited by Prof. Bjorn Kjellstrom, the 
erson who first drew attention to gasification back in the 70's.  It 
emains the only source of information that I refer every one, as it 
ontains the core information that most people need to understand producer 
as for engines.
>On the other hand, the high hydrogen content of producer gas gives it a
wide combustion range and fast burning properties.
I would totally agree, but it has to be remembered that on average, producer 
as has only 40% of it's volume as combustible gas, and only about 50% of 
hat, is H2, which has less effect on the behaviour of the gas as the speed 
ncreases over about 2,500RPM.
> Motorcycles are
regularly converted to producer gas and they have high RPM.
The fact that high RPM can be achieved, is only relevant in how it transfers 
o power at the end use. Last month, our guys in Australia took their Tasman 
lass out for a drive in their pickup (utility), and found that they had to 
rive along at 50 kms/hr in third gear (of four), with the engine over 3,000 
PM at times. Engine exhaust temperature was 750C, gas cooling started at 
50C. It drove like a pig, to quote them!  The same engine on their 
enerator, runs at 1,500RPM, and the gas cooling starts at 360C. They too 
osed the question of why stick to 2,500RPM as the limiting factor.
Translated into plain practical terms, once the engine speed exceeds the 
lame speed, the engine cannot respond to load change demand, critical for 
ost rural power generation, not so, for those who have lesser standards of 
eed, and don't like to walk. (:-)
<So I wouldn't worry about it.
I worry about every possible statement since an idiot of my former 
cquaintance, presented the H2 content out of context to less informed 
eople.
>The low speed reports may apply to producer gas from coal which have
very low hydrogen content.
More the reason to ensure that historical information has a line drawn under 
t, and some serious editing done to all new publications to weed out cross 
echnology assumptions.
>Do it.
Totally agree, but we must start from an informed base for the application.
egards,
oug Williams.

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