Pollution burning pellets or pellets

[stef5555]

carbidesn methyl alcohol, cronolitic and amyl alcohol, ether, FORMALDEHYDE acetone, acetic, butyric, valeric acids and nitrogenous compounds of ammoniacal form.

bless you........

[Woodcutter]

[...] just plain wood that burns with very little oxygen in the inserts [...]

Uh ... the starting point is about granulated and, it seems to me, we are far from being in these conditions!

Now, for a more general scope of the discussion, each theory, each idea, each gesture, each invention has its opponents and if they are expressed, that's good, because it proves that we are still a little (or that we have the illusion ...) in a free country.

After, it is necessary to cross-check the information that we find, to question the value of the results, etc ...

Well, if you search a little, I'm sure you can find people who will tell you that global warming is a sham ...

[Leon_pp]

Hello everyone,

I would like to tell you that I know the subject particularly well, since I work in a factory which manufactures close to 10 tonnes of pellets per year.

FYI, yes we use coal to create hot air and dehydrated sawdust (change from 50% to 7% final humidity)
We need about 8T of coal to make 160T of pellets (daily production) and to that is added a lot of Kw Electric.

But I remind you that the fuel oil must be refined, the gas must be compressed ...

It is on the energy balance of any sources is not zero, the transport is always present, the logistics too.
But you have to see what it also changes in the end for the client.
Between burnt 4500L of Fuel oil and 10T of pellets, I think the balance is more favorable at a lot of level.

If you have any questions about manufacturing, don't hesitate, I think I know what I'm talking about.

[Christophe]

Hi Leon, welcome here.

It feels good to get figures from a sector pro! Thank you!

Does your company have a site explaining the manufacturing process with the different stages and the energies used in the manufacturing of wood pellets?

Otherwise would you have some doc (.pdf or .doc) that you could provide here?

If yes I think we should create a new subject named for example:

"Manufacturing and embodied energy of wood pellets or pellets" because this subject is more oriented "combustion".

[Christophe]

Here is a document that answers, at least partially, the original question:

combustion analysis for wood and biomass boilers

[Christophe]

Documents arrive:

Analysis of combustion and pollution of wood pellets and agropellets

[Christophe]

Analysis from this document combination of solar energy and wood for the home



Tar = tar = soot
VOC = VOC = volatile organic compound

Wood is therefore clean only on CO2... and we can clearly see the advantage of pellets: burning very dry wood

[Did67]

Wood is therefore clean only on CO2... and we can clearly see the advantage of pellets: burning very dry wood

And on SO² too, I believe (acid rain - we don't talk about it anymore). Again, there is fuel oil. Between the cheapest and the extra (desuffled, etc ...).

The figures date from a conference held in 2000. Since then, pellet boilers have made further progress.

I give you the figures for an Okofen PESK 15 (condensing), in mg / MJ and in mg / kWh (knowing that 1 MJ = 0,278 kWh)

at nominal power:

CO: 21 mg / MJ or 75 mg / kWh
NOx: 72 mg / MJ i.e. 260 mg / kWh
OGC: 2 mg / MJ or 7 mg / kWh
Dust: 6 mg / MJ or 25 mg / kWh

at 30% of nominal power:

CO: 70 mg / MJ or 250 mg / kWh
NOx: 64 mg / MJ i.e. 230 mg / kWh
OGC: 2 mg / MJ or 7 mg / kWh
dust: not measured

In terms of particles, it seems to me that there is a technological leap there!

I could bring out the same data for the Hargassner (which was clearly below the emission rates of the Okofen, without condensation - it is also very stable, with similar rates between nominal power and reduced power).

I don't know the equivalence of OGC ("organically bound carbon") and VOCs ... And I don't have VOCs! Nor the tars ...

I regret that the current "against" wood articles speak generically of "wood burning".

We would make a considerable leap in terms of pollution reduction if all stoves, boilers, wood fireplaces (logs) were replaced by pellet boilers ...

That said, we must be honest enough to say that if we replaced all fuel oil boilers with pellet boilers:

- it would be a huge step forward for greenhouse gases, therefore global warming (tons of CO² less for a house)

- but there would be an increase in pollution in particles, CO, NOx, VOC ... (I estimate, roughly speaking, at 2 or 3 times more - or a few pounds for a house) ... That said, these compounds must be degraded otherwise we would be suffocated since time that humanity blazes wood (in particular to clear, burn crops in Africa, to heat, to cook ...), right?

The real question: will we have a choice forever ?????

[stone-ernest]

Another method to heat wood without polluting: put your old paper in the trash instead of recycling it.
Household waste is an increasingly attractive source of energy with increasing petroleum. And what is paper, if not wood!

But we find it normal and very ecological to burn wood when it is in the form of logs or pellets, andsave wood when it's in paper form ... weird, weird ...

[Christophe]

Uh there are still some filth in the printing paper: chlorine at the head but also all the inks ...

And I'm not talking about the glossy paper used for a lot of advertising (80% I would say) ...

Observe the flame of the paper: if it is green it is chlorine ...