[Gasification] Air Inlet Nozzles/Air Flow Ratio

[Thomas Reed]

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 < 10 kW to ~ 80 kW by ordinary 
civilians and fit on the back of a car or truck. 

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" <mariodg77 at email.it>
> To: <gasification at listserv.repp.org>
> 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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>>
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>
>