Hi Crispin and Jock,
Interesting to see these new devices take shape.
I have seen prices for high percentage grass or oat pellets (mixed with
10-20% wheat shorts) and pure oat hull pellets in the 135-150$/tonne
range, in bulk. I think the moisture might typically be higher than wood
pellets, or at least more variable than premium wood pellets, and of
course 5-10 times the ash. Some of these have left significant deposits
on boiler heat exchangers, could/should be better with pyrolysis, but I
guess that's what beta testing is for :)
Alex
On 13/09/2012 4:28 PM, Crispin Pemberton-Pigott wrote:
Dear Jock
I am interested to know how the economics of the pellet stoves that
produce a char byproduct compare economically with natural gas. It is
noted in the article that the sales of pellet stoves have fallen off
largely because of cheaper natural gas, a situation which may change soon.
If NG is the fuel of economic choice, I am wondering how the economics
look for biomass pellets (burned whole) and for biomass which does not
burn all the available carbon (which contains about 2/3 of the energy
in the pellet when loaded).
If about ½ the carbon is remaining as char (yielding 25% char) there
is a 33% fuel cost penalty for the same amount of energy.
It sounds as if you may have the numbers to go with these solutions.
If it looks good, then people using the char like greenhouses may find
the grass pellet option attractive (as is the case in Ontario at the
moment for switchgrass pellets).
Thanks
Crispin
+++++++
Bob et al:
I hope you will find this of interest. Please feel free to share.
I look forward to hearing from you.
Regards,
Jock
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