[Stoves] Fuel equivalents

[frank]

Dear Tom and stovers,

At the site  www.woodgas.com/proximat.htm has the statement:


"""Biomass fuels are characterized by what is called the "Proximate and 
Ultimate analyses".  The "proximate" analysis gives moisture content, 
volatile content (when heated to 950 C), the free carbon remaining at 
that point,  the ash (mineral) in the sample and the high heating value 
(HHV) based on the complete combustion of the sample to carbon dioxide 
and liquid water. (The low heating value, LHV,  gives the heat released 
when the hydrogen is burned to gaseous water, corresponding to most 
heating applications and can be calculated from the HHV and H2 fraction.)"""

This part of the sentence I am having trouble understanding.

volatile content (when heated to 950 C), the free carbon remaining at 
that point, 

Does carbon remain in a sample after heating it to 950C? and leaving it 
at that temperature for a time?   If that is true then how hot does it 
need to get to determine total carbon - the value used in the kj/g 
calculation?  Our Leco is set for 1050 C in pure oxygen. Is that high 
enough?

Most methods we use measure organic carbon at 550 deg. C.  I am 
wondering if the Free carbon is carbon between 550 and 950 and I am not 
reading this correctly.
And it seems we need not worry about carbonates (?) because they are not 
in most organic matter anyways, except perhaps in some dung.

Thanks for any insight.

Frank








Tom Miles wrote:

>See: 
>
>Biomass Cooking Stoves -> Fuels->Properties->Moisture Content
>http://www.bioenergylists.org/en/taxonomy/term/965
>
>Biomass Cooking Stoves -> Fuels->Properties->Heating Value
>http://www.bioenergylists.org/en/taxonomy/term/967
>
>Biomass Cooking Stoves -> Fuels->Wood
>http://www.bioenergylists.org/en/taxonomy/term/32
>
>Biomass Cooking Stoves -> Fuels->Charcoal
>http://www.bioenergylists.org/en/taxonomy/term/15/1
>
>etc.
>
>Tom Miles
>
>
>  
>
>>-----Original Message-----
>>From: stoves-bounces at listserv.repp.org [mailto:stoves-
>>bounces at listserv.repp.org] On Behalf Of Sharon Gordon
>>Sent: Tuesday, June 05, 2007 5:32 AM
>>To: stoves at listserv.repp.org
>>Subject: [Stoves] Fuel equivalents
>>
>>Is there a set of  equations I can use to figure out from a fuel
>>standpoint how much
>>green wood = dry wood = charcoal fuel = charcoal debris
>>for specific types of wood?
>>
>>And where are some good charts for looking at the different amounts of
>>energy available in different varieties of wood?  I can interlibrary
>>loan print resources if there are some good ones available that are not
>>archived on the internet.
>>
>>Sharon
>>gordonse at one.net
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>>Stoves mailing list
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>>http://info.bioenergylists.org
>>    
>>
>
>
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>  
>

-- 
Frank Shields
Soil Control Lab
42 Hangar way
Watsonville, CA  95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
www.compostlab.com