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Torrefied Wood Pellets is an Evolution for Biomass Fuel

Keywords: torrefied wood pellets,biomass pellets making,biomass woodpellets,biomass pellet mill

TOR wood pellet, nowadays, is getting active in biomass fuel market because of itsoutstanding 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 woodpellets 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. Theraw materials for torrefied wood pellets is produced under torrefaction effect. Rawmaterial is also the key difference between biomass wood pellets and the torrefiedwood pellet. Processed by torrefaction effect, the raw materials are changed to obtaina much better fuel quality forcombustion.

Torrefaction ProcessReaction conditions: normal atmospheric pressure; low oxygen condition; temperature220℃ ~ 320℃; reaction time 20 ~ 30 minutes.

Reaction process: Step 1: As temperature rises up, the water contained in the biomassas 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

Superior Performance of Torrefied Wood Pellets

With a higher energy density, less water content, pure composition, torrefied woodpellet has a lot of advantages comparing with wood pellets and even coal.

1. With a higher energy density, torrefied wood pellets performs more efficiently thancommon 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 releasedduring its burning.

4. After torrefied, biomass materials turn out to have a higher grindability index andthey are easier to pelletize by biomass pellet mill.

5. More dense, the shipping cost of torrefied wood pellets is less than that of woodpellets.

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