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Lignocellulosic residues for bioenergy : effects of storage, fuel design, and combustion characteristics

Bozaghian Bäckman, Marjan (2022). Lignocellulosic residues for bioenergy : effects of storage, fuel design, and combustion characteristics. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-955-1
eISBN 978-91-7760-956-8
[Doctoral thesis]

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Utilization of lignocellulosic residues for bioenergy raises storage, handling, and combustion challenges. The ash-forming elements in biomass may cause ash-related problems during combustion, such as slagging, fouling, corrosion, or bed agglomeration. Most of these problems are linked to ash-chemical reactions involving alkali. The overall objective of this thesis was to evaluate the impact of storage, fuel design measures, and process adaptation for improving combustion characteristics of lignocellulosic residues to mitigate ash-related operational problems. This was done by monitoring storage-induced changes in bark influencing final material characteristics. Mechanical screening and Ca-additivation on forest and agricultural residues were done as a fuel design measure. In addition, the performance of different bed materials was evaluated in bubbling fluidized bed combustion. Significant changes in the lignocellulosic matrix near pile surfaces were observed during storage of bark, and these changes will not affect the combustion characteristics. Screening efficiently reduced the amount of ash but was associated with significant fuel mass losses and did not change the ash chemistry; thus, combustion characteristics and ash melting behavior can be expected to remain unchanged. The Ca-addition significantly increased the total defluidization temperatures but implied an elevated risk for forming corrosive species and high CO (g) concentrations. High interactions between fuel ash and quartz bed particles and low interactions between fuel ash, olivine, and feldspar bed particles were observed. The feldspar bed material reduced defluidization temperature due to the increased amount of alkali in the bed by diffusion of alkali from feldspar grains. Overall, a good understanding of the ash transformation reactions is needed to mitigate ashrelated problems. In addition, fuel design measures must affect the ash chemistry in the fuel to be worthwhile.

Authors/Creators:Bozaghian Bäckman, Marjan
Title:Lignocellulosic residues for bioenergy : effects of storage, fuel design, and combustion characteristics
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number of Pages:88
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-955-1
ISBN for electronic version:978-91-7760-956-8
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Renewable Bioenergy Research
Keywords:lignocellulosic residues, bark storage, combustion, ash-related operational problems, ash-transformation reactions
Permanent URL:
ID Code:28444
Faculty:S - Faculty of Forest Sciences
Department:(S) > Department of Forest Biomaterials and Technology
Deposited By: SLUpub Connector
Deposited On:12 Aug 2022 14:25
Metadata Last Modified:12 Sep 2022 08:18

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