Which are the productive processes for obtaining tannin
from the wood of chestnut trees?
How can natural pellets be produced from processing spent wood?
Let's find out with Ledoga.
Ledoga, an arm of the Silvateam Group,
is a market leader in the sector, with a share of 60%
and a production of about 15000t per year of extract,
which is used mainly in the manufacture of soles
for high-quality footwear.
Silvateam's headquarters were set up years ago in San Michele Mondovì,
located in the foothills of the Alps,
very well placed for supply of high-class Piedmont timber.
It's exactly here in this plant
that processing is carried out of spent chestnut wood,
the residues of tannin extraction transformed into 100% natural,
class A1 pellets for burning with ash of less than 0.7%,
heating power of 4.6kWh per kilogram,
without added bonding and bleaching agents.
We catch up with engineer Mr. Vieno
to find out how cogeneration was set up inside the Ledoga facility.
What led Ledoga to choose cogeneration?
Ledoga is a big consumer of both electrical and thermal energy
and indeed energy costs make up about 25% of total product cost.
The intervention in relation to reducing energy costs
therefore leads to a benefit
especially from the commercial point of view
and an increase in market competitivity.
Which production processes in your company
require the greatest amounts of electrical and thermal energy?
Ledoga's electricity consumption makes up about 70% of our total need,
while Silvachimica uses 30%.
As for thermal energy,
Ledoga uses about 60% and Silvachimica 40%.
The biggest thermal energy user is the tannins department.
Why did you choose to install the plant in this in-building solution
and how was the plant integrated into your facility?
We chose to install the motor inside the old central power room,
which is the effective heartbeat of the facility.
This meant that we could optimise
both the electrical and the thermal connections,
since they already existed, and thus optimise the investment.
The motor has a 2700KW power rating
and almost entirely covers the facility's needs,
i.e. Silvachimica plus Ledoga,
and we have also found in two months of operations
that we have attained an overall performance of about 95%,
made up of 44% electrical and 51% thermal yield.
The motor's thermal energy is used in the pellet dryer
and the tannin department.
What advantages has Ledoga achieved?
The advantage is surely economical,
as energy costs have been reduced by more than 10%,
also leading to a competitive edge on the markets,
as we can, in practice, reduce production costs
to compete more effectively on the markets.
A further advantage
is the reduction in CO2 emissions into the atmosphere.
We have seen a reduction of about 5000 tonnes per year
with respect to a traditional plant,
and furthermore the emissions of both Nox and CO
are about a quarter of the authorised amounts.
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