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Ash transformation during single-pellet gasification of agricultural biomass with focus on potassium and phosphorus
Luleå University of Technology, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy. Luleå University of Technology, Sweden.
Umeå University, Sweden.
Umeå University, Sweden.
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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. © 2021 The Author(s)

Place, publisher, year, edition, pages
Elsevier B.V. , 2021. Vol. 217, article id 106805
Keywords [en]
Agricultural biomass fuels, Ash transformation, Gasification, Phosphorus, Potassium, Release, Biomass, Calcium compounds, Fuels, Grain (agricultural product), Magnesium compounds, Pelletizing, Silicates, Agricultural biomass, Agricultural biomass fuel, Bio-energy systems, Deposit formation, Residual ash, Residual char, Transformation Reactions, Wheat grains
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ri:diva-52623DOI: 10.1016/j.fuproc.2021.106805Scopus ID: 2-s2.0-85102537881OAI: oai:DiVA.org:ri-52623DiVA, id: diva2:1539792
Note

Funding details: Svenska Forskningsrådet Formas, 2017-01613; Funding details: Vetenskapsrådet, VR, 2016-04380; Funding details: Energimyndigheten, 41877-1; Funding text 1: The financial support from the ERA-NET Bioenergy for the GrateAdvance project (Swedish Energy Agency, Sweden project number 41877-1) and the Swedish Research Council, Sweden, project 2016-04380 are gratefully acknowledged. Further, Nils Skoglund gratefully acknowledges the financial support from the FORMAS project 2017-01613, Sweden. We thank prof. Klaus Hack (GTT Technologies), Dr. Moritz to Baben (GTT Technologies), and Prof. Rainer Backman (Ume? University) for productive discussion regarding thermodynamic equilibrium calculations.

Available from: 2021-03-25 Created: 2021-03-25 Last updated: 2021-03-25Bibliographically approved

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