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  3. Forestry and Resource Conservation / 森林環境暨資源學系
  4. Production of torrefied solid bio-fuel from pulp industrywaste
 
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Production of torrefied solid bio-fuel from pulp industrywaste

Journal
Energies
Journal Volume
10
Journal Issue
7
Date Issued
2017
Author(s)
Huang M.
Chang C.-C.
Yuan M.-H.
Chang C.-Y.
Wu C.-H.
Shie J.-L.
Chen Y.-H.
Chen Y.-H.
Ho C.
Chang W.-R.
Yang T.-Y.
FAR-CHING LIN  
DOI
10.3390/en10070910
URI
https://scholars.lib.ntu.edu.tw/handle/123456789/461161
URL
https://www2.scopus.com/inward/record.uri?eid=2-s2.0-85025125623&doi=10.3390%2fen10070910&partnerID=40&md5=45e6e8e36f36cbfc63d955a02f3fbdae
Abstract
The pulp industry in Taiwan discharges tons of wood waste and pulp sludge (i.e., wastewater-derived secondary sludge) per year. The mixture of these two bio-wastes, denoted as wood waste with pulp sludge (WPS), has been commonly converted to organic fertilizers for agriculture application or to soil conditioners. However, due to energy demand, the WPS can be utilized in a beneficial way to mitigate an energy shortage. This study elucidated the performance of applying torrefaction, a bio-waste to energy method, to transform the WPS into solid bio-fuel. Two batches of the tested WPS (i.e., WPS1 and WPS2) were generated from a virgin pulp factory in eastern Taiwan. The WPS1 and WPS2 samples contained a large amount of organics and had high heating values (HHV) on a dry-basis (HHD) of 18.30 and 15.72 MJ/kg, respectively, exhibiting a potential for their use as a solid bio-fuel. However, the wet WPS as received bears high water and volatile matter content and required de-watering, drying, and upgrading. After a 20 min torrefaction time (tT), the HHD of torrefied WPS1 (WPST1) can be enhanced to 27.49 MJ/kg at a torrefaction temperature (TT) of 573 K, while that of torrefiedWPS2 (WPST2) increased to 19.74 MJ/kg at a TT of 593 K. The corresponding values of the energy densification ratio of torrefied solid bio-fuels ofWPST1 andWPST2 can respectively rise to 1.50 and 1.25 times that of the raw bio-waste. The HHD ofWPST1 of 27.49 MJ/kg is within the range of 24-35 MJ/kg for bituminous coal. In addition, the wet-basis HHV ofWPST1 with an equilibrium moisture content of 5.91 wt % is 25.87 MJ/kg, which satisfies the Quality D coal specification of the Taiwan Power Co., requiring a value of above 20.92 MJ/kg. © 2017 by the authors.
Subjects
Bio-waste; Biomass; Pulp industry waste; Solid bio-fuel; Torrefaction; Torrefied bio-waste
SDGs

[SDGs]SDG2

Other Subjects
Anaerobic digestion; Biofuels; Biomass; Bituminous coal; Fertilizers; Soil conditioners; Agriculture applications; Bio-waste; Equilibrium moisture contents; High heating values; Industry wastes; Organic fertilizers; Solid bio-fuels; Torrefaction; Pulp; Biomass; Fuels; Pulp Industry; Taiwan; Wood Waste
Type
journal article

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