[Stoves] air for gazification

Thomas Reed tombreed at comcast.net
Thu Jun 14 16:09:22 EDT 2007 

Dear Frank:

In Denver 1 g/sec = 1 liter (1000 cm3)/sec.  At sea level 1 liter weighs 
1.3 g.

Where can I get a copy of the Andreatta report?

Thanks   

TOM REED

BEF
------------------------------------------------------------------------

frank at compostlab.com wrote:
> Tom, 
> I have a report titled "A report on some experiments with the Top-Lit up
> Draft(TLUD)Stove" by Dale Andreatta.  
>
> It has a lot of great info. It seems to have all the info I want and a table
> with the results I would like to produce using different fuels. In addition I
> would like to report the different characteristics of the fuels (as best as I
> can with the equipment I have available). 
>
> But once again I run into problems with the units. The flow rate for the
> primary air is reported as [ Primary air flow(g/sec) ]???? Typical numbers are
> 0.4 to 0.9 g/sec.
>
> Is there any way to convert g/sec to cm/sec? And what are the grams they are
> referring to? Is it the rate fuel is being oxidized? Or carbon (and carbon
> products) going to the secondary??
>
> Thanks for any help.
>
> Frank
>
>
>
>
>
>
>
> On Sun, 10 Jun 2007 09:01:11 -0700, Tom Miles wrote
>   
>> Frank,
>>
>> Go to the Biomass Cooking Stoves Website
>>
>> Select Design->Fan
>> http://www.bioenergylists.org/en/taxonomy/term/193
>>
>> You'll find a report by Mark Witt with fan calculations and computer 
>> fan data.
>>
>> Several other stoves have been built with fans, especially by CSU Students
>> and others at the Aprovecho camp last year. There are some pictures 
>> in the reports of those stoves but no useful fan data.
>>
>> You can also enter "fan" or "computer fan" in the discussion 
>> archives Search which will get you the messages about computer fans 
>> from both the stoves and gasification lists.
>>
>> Tom Miles
>>
>> -----Original Message-----
>> From: stoves-bounces at listserv.repp.org
>> [mailto:stoves-bounces at listserv.repp.org] On Behalf Of frank at compostlab.com
>> Sent: Saturday, June 09, 2007 8:32 PM
>> To: Discussion of biomass cooking stoves; 'Kevin Chisholm'
>> Subject: Re: [Stoves] air for gazification
>>
>> Dear Martin and stovers,
>>
>> <snip>
>>     
>>> My assume:
>>> -I expect for a normal 10cm diameter can to play with a power of 
>>> about 1kw
>>> (That is roughly: 1kw / 80square-centimetres) -To begin with 1/2 the 
>>> amount of the total burning air (I think or even hope, it will be 
>>> less for merely smoke making) In cifers: 1/2 of the total amount is: 
>>> 20 cubic feet of air per hour, that are 566.339 litres per hour, or 
>>> 9.439 litres per minute, or 157 millilitres per second.
>>>
>>> - 10 litres per minute are in the upper range of a normal oxygen-rotameter
>>> in anaesthesia-equipment. Such a rotameter would fit.
>>>
>>> - Transformed to the square-measure-unit 1 square-centimetre: 0.125 litres
>>> per minute.
>>>       
>> So, if my calculations are correct, our goal is an air flow of 
>> ~2cm/sec that will produce 0.22 BTU/cm2/sec at the surface where the 
>> primary burn takes place. This is the estimated ideal air flow be it 
>> forced air from a fan or heat convection?
>>
>> Can anyone give me the pressure produced from a computer fan? I have
>> compressed air but would like to simulate a computer fan blasting up 
>> the raw fuel chamber to the primary.
>>
>> Thanks
>> Frank
>>
>>     
>>> Let us have fun!
>>>
>>> Best wishes!
>>>
>>> Martin
>>>
>>>       
>>>> -----Ursprüngliche Nachricht-----
>>>> Von: Kevin Chisholm [mailto:kchisholm at ca.inter.net]
>>>> Gesendet: Samstag, 9. Juni 2007 01:59
>>>> An: boll.bn at t-online.de
>>>> Betreff: Re: [Stoves] air for gazification
>>>>
>>>> PERSONAL TOP SECRET INSIDER INFORMATION!!! :-)
>>>>
>>>> Dear Martin
>>>>
>>>> One cubic foot of air, under stoichiometric conditions will support
>>>> combustion that releases 100 BTU
>>>>
>>>> If you want 1 kw in 1 hour, ie, 1 kwh, you have to liberate 3412 BTU
>>>>
>>>> Therefore, you need, in theory, 34.12 cubic feet of air.
>>>>
>>>> Be\cause of poor mixing, etc, you will probably need about 15% top 25%
>>>> excess. Say 20% excess, or say a total of roughly 40 cubic feet of air
>>>> per hour.
>>>>
>>>> Now, roughly 1/2 should be blown in below the grate, as primary air, to
>>>> make gas, and the other half should be blown in above teh fuel, as
>>>> secondary air, to burn the gas to completion.
>>>>
>>>> That will be our little secret!! :-)
>>>>
>>>> Best wishes,
>>>>
>>>> Kevin
>>>>
>>>> Boll, Martin Dr. wrote:
>>>>         
>>>>> Dear all,
>>>>>
>>>>>
>>>>>
>>>>> where can I find a rough and ready-number, of the needed air (oxygen)
>>>>>           
>>>> amount
>>>>         
>>>>> for e.g. the release of 1kw heat-making wood-gas-amount in a
>>>>>           
>> T-LUD-type
>>     
>>>>> burner?
>>>>>
>>>>> - I am aware that moisture will make differences.
>>>>>
>>>>> - How many litres air per minute?
>>>>>
>>>>>
>>>>>
>>>>> Regards
>>>>>
>>>>>
>>>>>
>>>>> Martin
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>>
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>>>       
>> --
>> Frank Shields
>> Soil Control Lab
>> 42 Hangar Way
>> Watsonville, CA  95076
>> (831) 724-5422tel
>> (831) 724-3188fax
>> www.compostlab.com
>> www.greenrooflab.com
>>
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>>     
>
>
> --
> Frank Shields
> Soil Control Lab
> 42 Hangar Way
> Watsonville, CA  95076
> (831) 724-5422tel
> (831) 724-3188fax
> www.compostlab.com
> www.greenrooflab.com
>
>
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>   

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