Fate of phosphorus in pulverized fuel co-combustion of sewage sludge and agricultural residues

Häggström, Gustav (author): Luleå tekniska universitet,Energivetenskap,Swerim AB, Box 812, SE-971 25, Luleå, Sweden

Hannl, Thomas Karl, M.Sc. 1993- (author): Luleå tekniska universitet,Energivetenskap

Holmgren, Per (author): Umeå universitet,Institutionen för tillämpad fysik och elektronik,Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University

Broström, Markus (author): Umeå universitet,Institutionen för tillämpad fysik och elektronik,Thermochemical Energy Conversion Laboratory (TEC-Lab),Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University

Skoglund, Nils (author): Umeå universitet,Institutionen för tillämpad fysik och elektronik,Thermochemical Energy Conversion Laboratory (TEC-Lab),Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University

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Abstract Subject headings

The fate of phosphorus concerning its distribution in the thermal process and chemical speciation was studied during the co-combustion of sewage sludge with wheat straw and sunflower husks in powder combustion conditions. Co-combustion experiments were performed in a lab-scale entrained flow reactor (EFR) at 1000 °C and 1400 °C. SEM-EDS and ICP-OES analyses were used for studies of deposits collected on a probe, bottom ash, and particulate matter samples collected during experiments. Deposition probe samples were further studied and interpreted using powder X-ray diffraction (XRD) and thermochemical equilibrium calculations (TECs). The inorganic material in the different fuel particles mainly interacted through a molten phase observed on deposition probes. Crystalline P was mainly identified in β-Ca3(PO4)2 whitlockites. TECs support the experimental findings and suggest that a mostly homogenous melt occurs at 1400 °C, whereas Fe-oxides and Ca-phosphates precipitate during the cooling of the formed deposits. It was found that <5 % of incoming P was collected in fine particulate matter (<1 µm), indicating that the majority of P can be found in deposits and bottom ash. This outcome implies that P recovery efforts should be focused on these ash fractions.

By the author/editor: Häggström, Gusta ...; Hannl, Thomas Ka ...; Holmgren, Per; Broström, Markus; Skoglund, Nils; Öhman, Marcus, 1 ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

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