Home About Browse Search
Svenska


Does Mechanical Screening of Contaminated Forest Fuels Improve Ash Chemistry for Thermal Conversion?

Bozaghian, Marjan and Strandberg, Anna and Thyrel, Mikael and Bergström, Dan and Larsson, Sylvia (2020). Does Mechanical Screening of Contaminated Forest Fuels Improve Ash Chemistry for Thermal Conversion? Energy and Fuels. 34 , 16294-16301
[Journal article]

[img] PDF
2MB

Abstract

The effect of mechanical screening of severely contaminated forest fuel chips was investigated, focusing on main ashforming elements and slagging tendency and other properties with relevance for thermal conversion. In this study, screening operations were performed according to practice on an industrial scale by combining a star screen and a supplementary windshifter in six different settings and combinations. Mechanical screening reduced the amount of ash and fine particles in the accept fraction. However, the mass losses for the different screening operations were substantial (20−50 wt %). Fuel analyses of the non-screened and the screened fuels showed that the most significant screening effect was a reduction of Si and Al, indicating an effective removal of sand and soil contaminations. However, the tested fuel’s main ash-forming element’s relative concentration did not indicate any improved combustion characteristics and ash-melting behavior. Samples of the accept fractions and non-screened material were combusted in a single-pellet thermogravimetric reactor, and the resulting ashes’ morphology and elemental composition were analyzed by scanning electron microscopy−energy dispersive X-ray spectrometry and the crystalline phases by powder X-ray diffraction. Results from both these analyses confirmed that screening operations had no, or minor, effects on the fuels’ ash chemistry and slagging tendencies, i.e., the fuels’ proneness to ash melting was not improved. However, the reduction of ash and fine particles can reduce slagging and other operational problems in smaller and more sensitive combustion units.

Authors/Creators:Bozaghian, Marjan and Strandberg, Anna and Thyrel, Mikael and Bergström, Dan and Larsson, Sylvia
Title:Does Mechanical Screening of Contaminated Forest Fuels Improve Ash Chemistry for Thermal Conversion?
Series Name/Journal:Energy and Fuels
Year of publishing :2020
Volume:34
Page range:16294-16301
Number of Pages:8
ISSN:0887-0624
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 209 Industrial Biotechnology > Bioenergy
URN:NBN:urn:nbn:se:slu:epsilon-p-109213
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109213
Additional ID:
Type of IDID
DOI10.1021/acs.energyfuels.0c03196
ID Code:19661
Faculty:S - Faculty of Forest Sciences
Department:(S) > Department of Forest Biomaterials and Technology
Deposited By: SLUpub Connector
Deposited On:17 Dec 2020 10:43
Metadata Last Modified:15 Jan 2021 19:19

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits