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Torrefaction of Agricultural Residues: Effect of Temperature and Residence Time on the Process Products Properties
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.ORCID iD: 0000-0003-2088-5793
Wroclaw University of Science and Technology, Poland.
Silesian University of Technology, Poland..
Wroclaw University of Science and Technology, Poland..
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2020 (English)In: Journal of energy resources technology, ISSN 0195-0738, E-ISSN 1528-8994, Vol. 142, no 7, p. 070908-1-070908-8Article in journal (Refereed) Published
Abstract [en]

To date, few studies on the potential utilization of agricultural residue torrefaction products have been performed. Thus, torrefaction product characterization aimed at its potential utilization was performed. Wheat–barley straw pellets and wheat–rye chaff were used in the study. The impact of the torrefaction temperature (280–320 °C) on polycyclic aromatic hydrocarbons (PAHs) content in the biochar and noncondensable gas (noncondensables) composition was investigated. The impact of the torrefaction time (30–75 min) on the composition of the condensable volatiles (condensables) and their toxicity were also studied. The torrefaction process was performed in a batch-scale reactor. The PAH contents were measured using high-performance liquid chromatography (HPLC), and the noncondensables composition was measured online using a gas analyzer and then gas chromatograph with flame ionization detector (GC-FID). The condensables composition and main compound quantification were determined and quantified using gas chromatography–mass spectrometry (GC/MS). Three toxicity tests, for saltwater bacteria (Microtox® bioassay), freshwater crustaceans (Daphtoxkit F magna®), and vascular plants (Lemna sp. growth inhibition test), were performed for the condensables. The PAHs content in the biochar, regardless of the torrefaction temperature, allows them to be used in agriculture. The produced torgas shall be co-combusted with full-caloric fuel because of its low calorific value. Toxic compounds (furans and phenols) were identified in the condensable samples, and regardless of the processing time, the condensables were classified as highly toxic. Therefore, they can be used either as pesticides or as an anaerobic digestion substrate after their detoxification.

Place, publisher, year, edition, pages
ASME Press, 2020. Vol. 142, no 7, p. 070908-1-070908-8
Keywords [en]
biomass, polycyclic aromatic hydrocarbons, toxicity tests, energy from biomass, renewable energy
National Category
Engineering and Technology Energy Systems
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-269114DOI: 10.1115/1.4046275OAI: oai:DiVA.org:kth-269114DiVA, id: diva2:1411691
Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04

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Jagodzińska, KatarzynaYang, Weihong

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Energy and Furnace TechnologyMaterials Science and EngineeringApplied Thermodynamics and Refrigeration
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