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

["Tom Reed" <tombreed@attbi.com>]

Dear Mike and All:

The North American Combustion Handbook, V 1, 3rd edition,m lists the flame
speed of "a producer gas" (probably from coal, not biomass, but probably not
much different) as 0.26 m/s.  (For comparison, CO is .52   and H2 is 2.83.
I presume N2 is 0, so reduces the flame speed in producer gas in
proportion.)

The flame speed of producer gas is an important issue in combustion in
internal combustion engines, since the flame should finish combustion before
the exhaust gas pops.  As a result it is generally found that engines
running on producer gas reuire spark advance of 30-40 degrees (and possibly
should be more).

I doubt if flame speed is very important in our WoodGas stoves, but the
presence of methane and tars will further cloud the issue.

Onward...         TOM REED            BEF

----- Original Message -----
From: "Mike Norris" <mnorris@dekaresearch.com>
To: <gasification@crest.org>
Sent: Friday, November 01, 2002 4:56 PM
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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