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Torrefied Wood Pellets is an Evolution for Biomass Fuel .pdf



Original filename: Torrefied Wood Pellets is an Evolution for Biomass Fuel.pdf
Title: Azeus Machinery Co.ltd
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Azeus Machinery Co.ltd

Email: info@biopelletmachine.com
Website: www.biopelletmachine.com

Torrefied Wood Pellets is an Evolution for Biomass Fuel

Keywords: torrefied wood
pellets,biomass pellet mill

pellets,biomass

pellets

making,biomass

wood

TOR wood pellet, nowadays, is getting active in biomass fuel market because of its
outstanding performance in industrial heating. With a black surface and higher energy

density, it is likely called man made coal or bio coal. Then, what’s torrefied wood
pellets and how’s it made?

What is torrefaction for biomass pellets making?
What makes torrefied wood pellets special is the raw materials that it’s made of. The
raw materials for torrefied wood pellets is produced under torrefaction effect. Raw
material is also the key difference between biomass wood pellets and the torrefied
wood pellet. Processed by torrefaction effect, the raw materials are changed to obtain
a
combustion.

much

better

fuel

quality

for

Torrefaction Process
Reaction conditions: normal atmospheric pressure; low oxygen condition; temperature
220℃ ~ 320℃; reaction time 20 ~ 30 minutes.
Reaction process: Step 1: As temperature rises up, the water contained in the biomass
as well as superfluous volatiles are released.
Step 2: The biopolymers in biomass materials such as lignin,
hemicellulose and cellulose partly decompose to give off various types of volatiles.
The final torrefied biomass materials are solid, dry and blackened.
Parameter Comparing of Torrefied Wood Pellets with Wood Pellets and Coal

Species

Wood Pellets

Torrefied Wood Pellets

Coal

Moisture Content(wt%)

7.0-10.0

1.0-5.0

10.0-15.0

Volatiles(%db)

70-75

55-65

15-30

Calorific Value(GJ/t)

16-20

20-24

17-28

Bulk Density(t/m³)

550-750

700-850

800-850

Volumetric Energy Density(GJ/m³)

7.0-11.0

15-19

18-24

Ash(%)

1

1

9

Hard grove Grind ability Index

30

50

50

Superior Performance of Torrefied Wood Pellets
With a higher energy density, less water content, pure composition, torrefied wood
pellet has a lot of advantages comparing with wood pellets and even coal.
1. With a higher energy density, torrefied wood pellets performs more efficiently than
common wood pellets in power plant to replace coal.
2. With less water content, it is not easy to get damp, thus to save longer.
3. Torrefied wood pellet is a carbon neutral product. No polluting gases is be released
during its burning.
4. After torrefied, biomass materials turn out to have a higher grindability index and
they are easier to pelletize by biomass pellet mill.
5. More dense, the shipping cost of torrefied wood pellets is less than that of wood
pellets.


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