Unpublished production of miscanthus straw wood pellets

[stefff]

Message deleted by the author

[greg]

I'm interested, or can we see this machine?
greg

[dirk pitt]

without prejudging the perhaps great process that you have implemented, only part of the energy necessary for the manufacture of wood pellets is used for the press.
it is also necessary grinding / calibration and especially drying (which is done on the basis of pellet heating, it is true)

the quality and consistency of the final product depends very much on the quality of the sawdust as input. it is also the interest of large volumes compared to a small production: the variations are smoothed.

there are already small low-power presses like the one below

[bobono]

What slows down the development of production lines for sawdust pellets, etc. is the cost of the investment. Drying included.

Can you tell us the price for a small and medium production line. Thank you

[Christophe]

The energy costs of drying and grinding are high but are not that important, less than the costs of refining fuel oil for example.

Here are the numbers: gray energy from pellets and other petroleum fuels

[Capt_Maloche]

Besides, it's not easy to produce a clean granule

Isn't there too much dust coming off?

There is a sector which is developing strongly in our regions, it is called CALYS:

An alternative to wood pellets exists today, usable with the major brands of pellet wood boilers designed with moving bottom fireplaces (Gunter brand for example); this new type of pellet called Agro Pellet is made from locally available vegetable raw materials.

Its undeniable advantage is undoubtedly its annual renewal rate unlike wood, the rate of which will be greater than 20 years. This pellet ensures good quality combustion with no trace of clinker or acidic vapors and has a higher energy balance than wood pellet.

This new TOTALLY RENEWABLE energy source consists of an assembly consisting solely of plant co-products. The concept makes it possible to valorize all kinds of plant residues according to the locality: Broken seeds, silo sorting gaps, non-exploited vegetable matter. This source of material represents today 4000Tonnes annual in the region of Etampes (1% of cereal production)

The agricultural cooperative of Ile de France Sud established in the industrial area of ​​Morigny offers this sector from the beginning of 2009, and will be able to distribute at first more than 500Tons and ultimately 2500Tons of high quality compound pellets, for 60 % grain, 10% oilseed meal, 20/30% oak and beech lumber from sawmills and shavings and a mineral catalyst responsible for eliminating clinker and acid vapors ;

These granules of a new type can be stored in the same silos as the grains, thus allowing the cooperative to ensure a guaranteed stock of 6 months of combustible material at a price lower than wood pellets and at a cost 2 times less than domestic fuel oil.

https://www.econologie.info/share/partag ... tP8HUZ.pdf

Diet
The feed hoppers are used to empty the
contents of a big-bag or a small bucket.
They are equipped with:
• a dynamic devourer allowing a perfect
flow of matter;
• a protective grid;
• a recovery screw located under the hopper, ensuring
the extraction of the material.
The incorporation of additive
A special hopper allows to incorporate and
metering additives very precisely
in powder form.
Weighing - dosing
Upon entry of products into the Compact Unit of
Granulation, they are weighed continuously. This allows
precisely define the proportion
of each raw material.
Grinding
A pre-grinder followed by a hammer mill (refiner) allows
reduce the grain size:
• the pre-shredder breaks up coarse elements
(lumps, dumplings, chips);
• the refiner is fitted with hammers (steel blades) which strike
and explode the material and force it to pass through a grid
made of perforated sheet. The material is reduced to the state of flour
in order to give the final granule an impeccable appearance.
The mixture
• The ribbon mixer performs the mixing
different raw materials.
• A spray of water makes it possible to correct, if necessary,
humidity of the product.
• The mixture is then transferred by equipment
handling (elevator and Archimedes screw) to the unit
granulation.

Granulation
The presses do the job of
compaction of matter by forcing it
through the compression channels
of the industry.
The presses do this job thanks to
two compression rollers.
The volume of the material is reduced by 4 and the
granules obtained have a temperature
around 100 ° C.

The recooling
Cooling involves passing from
room temperature air in the bed
granules.
The horizontally circulating air absorbs the
heat contained in the granules, on contact
fresh air these cool.
The sieve placed below the cooler
remove fines before storage or
bagging granules.

[Christophe]

Besides, it's not easy to produce a clean granule

Isn't there too much dust coming off?

It is included in the standards, it is called "durability" (if it is not invented):

https://www.econologie.com/proprietes-de ... -3623.html
https://www.econologie.com/biocombustibl ... -3622.html

a) For pellets intended for individuals

- Origin: wood not chemically treated.
- Humidity: M08 (<8% relative).
- Durability: DU97,5 (which means that after sieving, see "Find out more", 97,5% or more of the pellets must remain intact).
- Diameter: D06 or D08 (6 or 8 mm).
- Length: <4 or 5 times the diameter, i.e. 30 mm maximum for D06.
- Ash content: <A0,5 (<0,5% volume)
- Sulfur: <S0,02
- Nitrogen: <N0,3
- Close: <Cl0,01
- PCI:> = Q16.9 (i.e. 16.9 MJ / kg or 4,69 kWh / kg)
- Bulk density MMV: BD650 (> 650 kg / m3)

[the middle]

Hello Stefff,
In Belgium, we are interested in your grass,
Take a look here: (keyword: Valbion- Miscanthus)
They have a lab too, it seems.
http://agriculture.wallonie.be/apps/spi ... ontres.pdf

[Christophe]

In Belgium, we are interested in your grass,

I confirm! I even have a plant in the garden that resumes well there, would like one more photo to make this AM!

[I Citro]

Good to recap:
- This company manufactures, among other things, pellet presses or pelletizers and grinders to condition the materials to be pelletized.
- Your entry level starts at 7.5kW in 380V Three-phase.

I already touched on the subject forum, and found, in France, Chinese products that start with machines less than 3kW (at € 600).

My thinking was as follows:
Our bins overflow with combustible materials, many of which invade us against our will (advertisements, packaging, garden waste ...) and we pay (taxes on household waste) to get rid of them.

So I imagined that we could recycle these fuels as it exists with "manual newspaper presses". For having tried such presses, I was able to appreciate the validity of the concept but not that of the product.

Can we therefore consider a compact shredder / pelletizer of less than 3600W in mono 230V (16A) at less than 1500 € TTC.

It remains to define the amount of material necessary to meet these own needs.