[Stoves] Metals in biofuels
frank at compostlab.com
Wed Jan 28 13:20:07 CST 2009
A few questions:
I noticed boron was not included but boron is a big factor in glass
making. Just wondering if it was looked into?
Also; titanium is included but that seems to be a rare constituent in
biomass. Where would that come from? Is that really important?
Wondering if carbonates are only in the ash where a carbonate is added
(lime) or if it can form at the right temperature? I find a lot of
carbonates in ash samples.
If dirt is included in the biomass is the oxides that are already formed
at the start a problem with slagging? or is it neutral and the problems
come during elements in the biomass structure converting to oxides at
the high heat?
Is Si in soil (quartz) a problem or only the Si that has been taken up
by plants (phytoliths)?
How is oxygen directly measured?
I think we should also add lead, arsenic and cadmium, perhaps zinc and
selenium as toxins that come from treated wood, plant accumulation and
additives that make toxic emissions.
I am thinking (hoping) that only the elements that dissolve in a hot
acid digest along with sulfate, chloride and phosphate is important for
us and not the 'rock' material left behind in the acid treatment when
Thanks - great report! My head a centimeter bigger.
Tom Miles wrote:
>For evaluating potential problems for slagging and fouling in gasifiers and
>combustors (e.g. stoves) we use ten elements in the ash reported as oxides:
>Carbon Dioxide (CO2) is measured to estimate losses on fusion.
>We measure total chloride in the fuel and of source sulfur. These elements
>volatilize during combustion and can cause fusion and deposits.
>You can see how we use these analyses in the report, "Alkali Deposits in
>Biomass Boiler", TRM Miles 1995 lined from my website www.trmiles.com or
>directly at http://www.trmiles.com/alkali/alkali.htm
>Many thanks for your help with the Gasifier Experimenters Kit (GEK) at ETHOS
>this weekend. It was a big distraction for Charlie to set it up but I think
>it was worthwhile.
>From: stoves-bounces at listserv.repp.org
>[mailto:stoves-bounces at listserv.repp.org] On Behalf Of frank
>Sent: Tuesday, January 27, 2009 4:35 PM
>To: Discussion of biomass cooking stoves
>Subject: [Stoves] Metals in biofuels
>Dear Stovers, charcoal makers and brick makers,
>Of the list of elements below I am wanting to know the ones that would
>be of interest in regards to causing problems, volatile toxins and of
>I have already added As, Cd, Pb, Zn, to my list for possible toxins.
>I have added Ca, Mg, K, P for possible nutrients in left over char and ash
>I have added Na, and K that may be problems in making an ash that forms
>Any comments of problems or concern or interest of the following will
>help me to put together a test program for testing biofuels.
>Soil Control Lab
>42 Hangar way
>Watsonville, CA 95076
>(831) 724-5422 tel
>(831) 724-3188 fax
>frank at compostlab.com
>Stoves mailing list
>Stoves at listserv.repp.org
Soil Control Lab
42 Hangar way
Watsonville, CA 95076
(831) 724-5422 tel
(831) 724-3188 fax
frank at compostlab.com
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