On 16/10/2012 6:00 AM, [email protected] wrote:
Thanks, Doug. That was very useful.
On a related note, I was at an ORC seminar yesterday where an ERK
licensee was discussing the issues - including calorific variation -
associated with burning producer gas in large scale gasification
plants. He was emphasising that tight control of the feedstock was of
paramount importance
Regards
David
------------------------------
Message: 2
Date: Mon, 15 Oct 2012 15:07:54 +1300
From: "doug.williams"<[email protected]>
To: "Discussion of biomass pyrolysis and gasification"
<[email protected]>
Subject: Re: [Gasification] Using LPG/natural gas burners with
producer gas
Message-ID:<EDB2ABF595E945DA811AE092921D55B0@dougspc>
Content-Type: text/plain; charset="iso-8859-1"
Hello David,
Not sure if I can answer your question in a way that is of immediate relevance,
as it's ongoing practical work in progress.
I've just been doing some work comparing the costs of thermal energy
from biomass systems against LPG/natural gas.
Our development project in California at their location, has substantial
financial advantage over LPG for glass house heating.
A number of industry
references pointed out the importance of correctly configuring burners
to use gas of different calorific values. How is this best achieved with
producer gas where the calorific values can vary quite a bit?
We went down the road of trying to use standard gas and oil type burners back
around 1979-80 for producer gas, and found after nearly four years, that we
were flogging a dead horse. Another year to 1985 saw the design of our cyclomix
burner become reality, allowing it's proof of concept to be established.
I made quite a few for our Pacific Class systems 90Nm3/hr of gas, and larger
ones for a number of other special projects. Unfortunately, I never had an
opportunity to set up a real testing programme dedicated to just these burners,
so while they burn very well for their applications, we still are fine tuning
their sizing parameters and emission control of NOX etc.
All our new work on burners is being done as part of the development programme
at CalForests gasification project in California. You can see some of the
burners in action on the Fluidyne Archive www.fluidynenz.250x.com under the
File Producer Gas Flares, Gasification Testing in Chile, and some of the
larger ones in the Californian Andes Gasifier Files.
What I can tell you about producer gas combustion, is that if not completely
mixed before ignition, the CO will enter the high temperature flame without
igniting and revert to soot and CO2. This of course comes back to dealing with
the variations of gas quality, which in our cyclomix burner, the flame just
lengthens or shortens, but never blows out so long as some gas is present.
Having said all this in a general way, the specifics of the gas making process
determine the outcomes, just like the engine application and the problems that
manifest in all manner of ways.
Hope this may be of interest to you.
Doug Williams,
Fluidyne...
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