RE: GAS-L: Flame speed in producer gas.

["Jensen, Torben Kvist" <tkj@mek.dtu.dk>]

The flame speeds given here are determined for a synthetic fuel with the same composition as a gas produced from gasification of wood chips in i a two-stage gasifier with an externally heated pyrolysis unit (see www.bgg.mek.dtu.dk). The earlier given flame speeds are valid at 6-7 atm. The flame speed at 1 atm and T_unburned=298 K is 0.65 m/s at lambda=1.0 and 0.50 m/s at lambda =1.25.

Torben Kvist Jensen




___________________________________________________________


The paper lists the flame speed as the flame approaches the 
combustion chamber wall when the pressure will be ~ 10 bar.
I am interested in the flame speed at 1 atm.  Is that data
available?  

Mike Norris

-----Original Message-----
From: Jensen, Torben Kvist 
Sent: 4. november 2002 09:03
To: Mike Norris; gasification@crest.org
Subject: RE: GAS-L: Flame speed in producer gas.


At the Technical University of Denmark we have determined the laminar flame speed of producer gas and mixtures of producer gas and natural gas. This was done applying a spherical combustion bomb containing a mixture of fuel and air. Electrodes located at the center of the bomb ignited this mixture and the laminar flame speed was calculated from a measured pressure-time history. For a producer gas with the composition CH4=2%, CO=15%, H2=35%, N2=30% and CO2=18, the laminar flame found to be 2.0 m/s @ lambda=1.0 and 1.1 m/s @ lambda=1.25. Further details about the determination of the flame speed and the flame speed of mixtures of producer gas and natural gas can be found in the SAE paper 1999-01-1571. In the SAE paper 2000-01-2824 we have reported different fuel properties of mixtures producer gas and natural gas (as e.g. flame speed) deduced from combustion engine experiments.


Torben Kvist Jensen. Assistant professor, Ph.D.
Department of Mechanical Engineering
e-mail: tkj@mek.dtu.dk
web: www.bgg.mek.dtu.dk

-----Original Message-----
From: Mike Norris [mailto:mnorris@dekaresearch.com]
Sent: 2. november 2002 00:56
To: gasification@crest.org
Subject: GAS-L: Flame speed in producer gas.


I'm looking for the flame speed of producer gas.  Does someone know
the values or where I can find them.  I can find the flame speed of H2 and 
CO, but I don't know how calculate the flame speed for the mixture.

Mike Norris





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