Working Paper Communication Version 2 This version is not peer-reviewed

Water Resistance of Torrefied Wood Pellets Prepared by Two Methods

Version 1 : Received: 29 September 2020 / Approved: 30 September 2020 / Online: 30 September 2020 (10:15:52 CEST)
Version 2 : Received: 5 October 2020 / Approved: 5 October 2020 / Online: 5 October 2020 (16:39:37 CEST)

How to cite: Yoshida, T.; Kuroda, K.; Kamikawa, D.; Kubojima, Y.; Nomura, T.; Watada, H.; Sano, T.; Ohara, S. Water Resistance of Torrefied Wood Pellets Prepared by Two Methods. Preprints 2020, 2020090735 Yoshida, T.; Kuroda, K.; Kamikawa, D.; Kubojima, Y.; Nomura, T.; Watada, H.; Sano, T.; Ohara, S. Water Resistance of Torrefied Wood Pellets Prepared by Two Methods. Preprints 2020, 2020090735

Abstract

To examine the hydrophobicity of torrefied wood fuel, the water resistances of torrefied pellets prepared by two different methods were evaluated using exposure tests under indoor and outdoor conditions. Torrefied pellets from the xylem of Japanese cedar (Sugi, Cryptomeria japonica) and oak (Konara, Quercus serrata) were prepared by two methods: the torrefaction of wood chips followed by pelletization and the pelletization of wood chips followed by torrefaction. It was found that the pellets prepared by pelletization followed by torrefaction had much lower moisture levels than those prepared by the other method and they showed almost no change in diameter after an outdoor weathering test. These characteristics are unique and indicate that the pellets can be applied not only for industrial use but also for residential and commercial purposes.

Subject Areas

wood pellet; torrefaction; hydrophobicity; water resistance

Comments (1)

Comment 1
Received: 5 October 2020
Commenter: Takahiro Yoshida
Commenter's Conflict of Interests: Author
Comment: 1. In line 16 in the abstract, "oak" -> "chestnut oak"
2. Figure 1 had been already presented in the domestic conference in 2012. The reference was added as [18] .
 " Yoshida, T.; Sano, T.; Kuroda, K.; Ohara, S.; Watada, H.; Nomura, T.; Itoh, T. Fundamental study on production of “Hyper wood pellet” (5) Effect of superheated steam treatment during torrefaction on properties of the torrefied pellets”, Proc. 30th Annual Conf. on Wood Technological Association of Japan, Tokyo, Oct. 2017, O14, p.35-36, (in Japanese)."
3. Line 270-271 was revised.
 "Torrefied pellets can make a significant contribution to the development of wood-based bioenergy utilization, although further studies are needed on lowering production costs."
4. The reference number after 18 was revised.
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