Comparative VS softwood pellets, advice and feedback?

Heating, insulation, ventilation, VMC, cooling ... short thermal comfort. Insulation, wood energy, heat pumps but also electricity, gas or oil, VMC ... Help in choosing and implementation, problem solving, optimization, tips and tricks ...
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Did67
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Re: Comparative Softwood VS pellets, reviews and feedback?




by Did67 » 06/12/17, 11:16

fabio.gel wrote:
If your boiler is set on hardwood, do not change especially (if you have access to the admin code of the motherboard to change the settings).
I had done the test on my old pellet stove that is set on softwood, poor combustion result and much too much ash.



Correct: the quantity of oxygen necessary for complete combustion actually depends on the PCI (roughly speaking, the PCI is the number of bonds -CC- and - C - H) of a fuel. So the more there are of these bonds to "crack" and the more it will be necessary to "stick" of oxygen atoms on these covalent bonds ...

So a fuel with a higher "dry" PCI therefore requires more O² [NB: if the PCI drops due to humidity, this has no effect; it is therefore the PCI of the perfectly dry fuel that must be considered].

The "ratio" between the pellet feed screw and the control of the combustion air feed fan must then be changed.

The sign: a "blackening" at the level of the burner (elsewhere, the deposition of a black feurage of C particles is inevitable) sign of incomplete combustion (and greater releases of toxic CO!)
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Christophe
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Re: Comparative Softwood VS pellets, reviews and feedback?




by Christophe » 14/05/18, 11:30

Illustration of the change from 80% hardwood / 20% resinous pellets to 100% resinous "very first price" pellets (3,19 per bag): the ashes are much darker and thicker ...

What does chemically a darker ash mean?

3 photos with progressive zoom:

cendres_pellets_1.jpg


cendres_pellets_2.jpg


cendres_pellets_3.jpg


It looks like slag ... (not that great ???) ... yet all the pellets I used were DIN PLUS ...
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Re: Comparative Softwood VS pellets, reviews and feedback?




by Did67 » 15/05/18, 14:23

Darker = more carbon = more incomplete combustion, possibly at lower temperature.

The "top" of the combustion gives gray ashes, "pure mineral" ...
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Christophe
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Re: Comparative Softwood VS pellets, reviews and feedback?




by Christophe » 15/05/18, 15:03

I was also thinking of a higher carbon content, thank you for confirming.

Well here are the DIN PLUS first price is not so good ...
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Re: Comparative Softwood VS pellets, reviews and feedback?




by Did67 » 15/05/18, 15:37

After that, it's a question of calculation (apart from pollution): for x% less yield, what is the price difference y in% ??? Except that to know "x" !!!!!!
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Julie dubourg
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Re: Comparative Softwood VS pellets, reviews and feedback?




by Julie dubourg » 27/08/20, 14:24

How to choose the right pellet between the different types of wood that can compose it? I think this article will also interest you: -https: //www.simplyfeu.com/blog/granules-de-bois-pellets/

Published by Remundo: it is limit limit of SPAM. I leave it for information
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Christophe
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Re: Comparative Softwood VS pellets, reviews and feedback?




by Christophe » 27/08/20, 16:59

It's not at the limit, is!

Don't hesitate to type a warning (I did it there) as soon as this kind of case happens ...
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