[Stoves] Metals in biofuels

[Tom Miles]

Peter,

The Phyllis Database (now Biodat) http://www.ecn.nl/phyllis/  has
information on coconut but very little in the way of ash characteristics. I
see ash values of 0.5-5%. We may find information as part of a specific
study.   

MMBTu is million British Thermal Units. There are several SI conversion
utilities. We tend to work in both.   

Tom




-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of Peter Verhaart
Sent: Wednesday, January 28, 2009 4:27 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] Metals in biofuels

Tom,

Are there any figures available for coconut shells? I would expect a 
very low ash content.
What is a MMBtu? Mean Mega British thermal unit?
Way back at an introductory physics lecture, the professor, explaining 
units, praised the unit of time, the second. "Even the British use it", 
he said.

Peter (strictly SI) Verhaart


Tom Miles wrote:
> Frank,
>
> You can get slag in the firepot of a pellet stove which is only about 4-6
in
> (100-150 mm) diameter and about 4-6 inches deep. A good high temperature
in
> the GEK will slag walnut shells. We measured concentrations of alkali,
> primarily potassium, of 0.71-1.065 lb/MMBtu in walnut hulls and blows.
> (Alkali Report Appendix C.8 Nut, Pits and Shells) Because the amount of
ash
> is small it takes time to accumulate it. Almond hulls are worse at 4
> lb/MMBtu.


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