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Ash transformation during single-pellet gasification of agricultural biomass with focus on potassium and phosphorus
Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå, Sweden.
Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå, Sweden; RISE ETC (Energy Technology Centre) AB, Box 726, Piteå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. Umeå University, Faculty of Science and Technology, Department of Chemistry.ORCID iD: 0000-0002-5777-9241
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2021 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 217, article id 106805Article in journal (Refereed) Published
Abstract [en]

Agricultural biomasses and residues can play an important role in the global bioenergy system but their potential is limited by the risk of several ash-related problems such as deposit formation, slagging, and particle emissions during their thermal conversion. Therefore, a thorough understanding of the ash transformation reactions is required for this type of fuels. The present work investigates ash transformation reactions and the release of critical ash-forming elements with a special focus on K and P during the single-pellet gasification of different types of agricultural biomass fuels, namely, poplar, grass, and wheat grain residues. Each fuel was gasified as a single pellet at three different temperatures (600, 800, and 950 °C) in a Macro-TGA reactor. The residues from different stages of fuel conversion were collected to study the gradual ash transformation. Characterization of the residual char and ash was performed employing SEM-EDS, XRD, and ICP with the support of thermodynamic equilibrium calculations (TECs). The results showed that the K and P present in the fuels were primarily found in the residual char and ash in all cases for all studied fuels. While the main part of the K release occurred during the char conversion stage, the main part of the P release occurred during the devolatilization stage. The highest releases – less than 18% of P and 35% of K – were observed at the highest studied temperature for all fuels. These elements were present in the residual ashes as K2Ca(CO3)2 and Ca5(PO4)3OH for poplar; K-Ca-rich silicates and phosphosilicates in mainly amorphous ash for grass; and an amorphous phase rich in K-Mg-phosphates for wheat grain residues.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 217, article id 106805
Keywords [en]
Agricultural biomass fuels, Ash transformation, Gasification, Phosphorus, Potassium, Release
National Category
Bioenergy Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-181784DOI: 10.1016/j.fuproc.2021.106805ISI: 000647475600010Scopus ID: 2-s2.0-85102537881OAI: oai:DiVA.org:umu-181784DiVA, id: diva2:1541592
Funder
Swedish Research Council Formas, 2017-01613Swedish Research Council, 2016-04380Swedish Energy Agency, 41877-1Available from: 2021-04-01 Created: 2021-04-01 Last updated: 2023-09-05Bibliographically approved

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Boman, ChristofferSkoglund, Nils

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