[Gasification] pre mixed boiler secrets?

[Thomas Reed]

Dear Alex and all

Several years ago I a spent year or so measuring flame speeds of combustion for various gasolines, and reading about them.  My memory is that CO HAD THE SLOWEST FLAME SPEED OF ALL, O.2 ft/sec; almost all other gases WERE 0.5 ft/sec; and hydrogen (and probably acetylene) were 5 ft/sec. This is my memory, but I might be off.  

TOM reed


Dr Thomas B Reed
President, The Biomass Energy Foundation
www.Woodgas.com

On May 18, 2011, at 9:44 PM, Alex English <english at kingston.net> wrote:

> My father in law did some of the early work on pure acetylene detonation at Los Alamos in the 1950s. He tells the story of taking the "shocking" results to Eisenhower's science advisor to warn of the dangers. Advice that was dismissed until an industrial plant blew up.
> 
> He was in to nuclear gasification. Lets make a harbor in Alaska.
> 
> 
> 
> As for premixed producer gas. Does any one have a top speed for an optimum producer gas flame?  Then can't you just calculate or trial the pipe diameter leading to the burner that keeps the premix moving faster than that speed.
> 
> Top speed for hydrogen in air is around 12 ft/sec. Can you live with that?
> 
> 
> Alex
> 
> On 5/18/2011 8:27 PM, David G. LeVine wrote:
>> On 05/17/2011 10:41 PM, Anand Karve wrote:
>>> Dear List,
>>> A pure gas inside the cylinder or inside a hose pipe would not burn
>>> unless it is mixed with oxygen. One can hold a candle in front of the
>>> nozzle of a cylinder full of combustible gas like LPG or CNG and then
>>> open the valve. The gas would burn only when it comes out of the
>>> cylinder. Migration of the flame into the transmission hose is
>>> possible only if somehow oxygen enters the hose.
>>> Yours
>>> A.D.Karve
>> 
>> Actually, while acetylene doesn't burn without oxygen, it can decompose
>> (usually due to pressure) and generate significant heat and pressure.
>> Often this is called an explosion (it isn't, exactly, but the results
>> are spectacular.)
>> 
>> Dave 8{)
>> 
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> 
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