[Gasification] Air Inlet Nozzles/Air Flow Ratio

Mon May 29 08:53:49 CDT 2006

Dear all,

i'm sure that in these books i will find what i need, but actually i'm still
waiting the book I ordered more than 1 month ago :( and unfortunately i have
no more time to wait it or others...

so I ask , if i have to calculate the air flow for a gasifier, what i have
to do is to calculate the air needing for a complete combustion and take
more or less 26-29% of it?

thanks,

mario

	--------- Original Message --------
	Da: Thomas Reed <tombreed at comcast.net>
	To: gasman <gasman at welho.com>
	        Cc: GASIFICATION at LISTSERV.REPP.ORG
	Oggetto: Re: [Gasification] Air Inlet Nozzles/Air Flow Ratio
	Data: 29/05/06 00:41

	> 
> 
> 
> 
>   
> 
> 
> Dear Gasifier Designers:
> 
> I am glad to see this discussion of gasifier design and dimensions
> here.  The Imbert (nozzle type) gasifier was the most widely used
> biomass gasifier so far (over a million cars, trucks and buses during
> WWII).  It is very important to size the gasifier correctly to the gas
> and power generation desired.  
> 
> Having developed the "stratified downdraft gasifier" (at NREL,
> 1980-1988) and the inverted downdraft gasifier-stove, I have long
> thought that the Imbert design was inferior and that we could do better
> today.  So far, no one has done better.  Those gasifiers cost ~ $1,000
> (1983 dollars) and were operated from 
> 
> The FAO book is good on this subject.  However, in our books there is
> much more detail.  I spent the morning today studying the scaling
> factors shown in the much larger dimensioning tables in our books:
> 
> GENGAS: THE SWEDISH CLASSIC ON WOOD FUELED VEHICLES:
>  (SERI-1979) T. Reed, D. Jantzen and A. Das,
> with index. This is the "Old Testament" of gasification, written
> English translation, of "Gen-Gas", written by the Swedish Royal Academy
> at the end of WW II after successfully converting 90% of transportation
> of WW II Sweden to wood gasifiers.
> ISBN 1-890607-01-0                                      
> 340pp                               $35
> 
>  and 
> 
> BIOMASS DOWNDRAFT GASIFIER ENGINE
> SYSTEMS HANDBOOK:   T. Reed and A.
> Das, (SERI-1988) Over a million wood gasifiers were used to power cars
> and trucks during World War II. Yet, there are now only a few companies
> manufacturing gasifier systems. The authors, who have spent more than
> 20 years working with various gasifier systems, discuss the factors
> that must be correct to have a successful "gasifier power system." Our
> most popular book, the "new Testament" of gasification.
> ISBN 1-890607-00-2                                     
> 140pp                               $30
> 
> available at our website www.woodgas.com along with a number of other
> books on both the theory and practice of gasifier design and
> construction.  
> 
> Yours truly,
> 
> TOM REED             THE BIOMASS ENERGY FOUNDATION
>  
> 
> 
> 
> gasman wrote:
> 
>   
> Hello Mario!
>   
>   
> On the front page of the same download book, up
>   
> in the right corner, you can find the PDF version
>   
> of the same book. It has a lower quality, but with
>   
> a good magnifying glass, you will be capable to
>   
> read it, and the GRAPHICS!!!
>   
>   
> There are all the original graphic charts missing
>   
> from the HTML version.
>   
>   
> There are nozzle tip areas to hearth areas, and
>   
> many more! Go on!
>   
> Remember though, that these are for cold air, and
>   
> for preheated air, you have to enlarge them in
>   
> proportion to the air enlargement along the
>   
> "Kelvin scale"!
>   
>   
> Max
>   
>   
>   
> ----- Original Message ----- From: "Mariodg77"
> 
>   
> To: 
>   
> Sent: Friday, May 26, 2006 6:12 PM
>   
> Subject: [Gasification] Air Inlet Nozzles/Air Flow Ratio
>   
>   
>   
>   dear forum,
>     
>     
> studying the fao's book (woodgas as an engine fuel) i'm understanding a
> lot
>     
> of things....
>     
>     
> now, trying to make calculations about the plant in Loma Plata, i see
> that
>     
> the graphs to calculate the dimensions of the air inlet nozzles
> depending on
>     
> the throat diameter (from which depends the diameter of the fire box,
> the
>     
> Ratio between nozzle flow area and throat area, the nozzle top ring
> diameter
>     
> ecc ...
>     
>
http://www.fao.org/documents/show_cdr.asp?url_file=/DOCREP/T0512E/T0512e00.htm
>     
> )
>     
> have a maximum value for the troath diameter of 300 mm .
>     
>     
> i estimated a throath diameter for a single gasifier in loma plata of
> about
>     
> 4300 mm.
>     
> how can i calculate the values of inlet nozzles? (read also how can i
>     
> calculate the air flow ratio in a single gasifier?)
>     
>     
> can someone suggest me more detailed graphs?
>     
>     
>   
> 
> 
> 
> 
> 
>   thanks,
>     
>     
> mario
>     
>     
> --
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