The ash formation during co-combustion of wood and sludge in industrial fluidized bed boilers

Jouko Latva-Somppi (Corresponding Author), Esko Kauppinen, Tuomas Valmari, Petri Ahonen, Abhijit Gurav, Toivo Kodas, Bo Johanson

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Ashes from an industrial bubbling fluidized bed (BFB) and a circulating fluidized bed (CFB) boilers burning biomass and paper mill sludges are characterized. Bulk sampling was carried out with a simultaneous low pressure impactor sampling (BLPI) and with on-line monitoring of submicron ash gas phase size distribution.
The principal ash forming mechanism was sintering of 1–10 μm inorganic paper filler particles, into 5–200 μm ash agglomerates. Despite few spherical particles no ash melting was detected. The fraction of vaporized and condensed ash was below 0.1 mass% in both units as determined with BLPI and with on-line monitoring. According to elemental mass size distributions no significant vaporization of any main element occurred including sodium and potassium.
Wall deposit observed on refractory lining in BFB furnace was composed of sintered ash binding large ash and sand particles in the structure. No molten phases were detected to participate in the layer growth. Most quartz sand grains in the bed were covered by a thin layer of small ash particles, below 5 μm in size.
Original languageEnglish
Pages (from-to)79-94
JournalFuel Processing Technology
Volume54
Issue number1-3
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

Fingerprint

Ashes
Sewage sludge
Fluidized beds
Boilers
Wood
Sand
Fluidized bed furnaces
Sampling
Quartz
Monitoring
Vaporization
Linings
Refractory materials

Keywords

  • fluidized beds

Cite this

Latva-Somppi, J., Kauppinen, E., Valmari, T., Ahonen, P., Gurav, A., Kodas, T., & Johanson, B. (1998). The ash formation during co-combustion of wood and sludge in industrial fluidized bed boilers. Fuel Processing Technology, 54(1-3), 79-94. https://doi.org/10.1016/S0378-3820(97)00061-1
Latva-Somppi, Jouko ; Kauppinen, Esko ; Valmari, Tuomas ; Ahonen, Petri ; Gurav, Abhijit ; Kodas, Toivo ; Johanson, Bo. / The ash formation during co-combustion of wood and sludge in industrial fluidized bed boilers. In: Fuel Processing Technology. 1998 ; Vol. 54, No. 1-3. pp. 79-94.
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abstract = "Ashes from an industrial bubbling fluidized bed (BFB) and a circulating fluidized bed (CFB) boilers burning biomass and paper mill sludges are characterized. Bulk sampling was carried out with a simultaneous low pressure impactor sampling (BLPI) and with on-line monitoring of submicron ash gas phase size distribution. The principal ash forming mechanism was sintering of 1–10 μm inorganic paper filler particles, into 5–200 μm ash agglomerates. Despite few spherical particles no ash melting was detected. The fraction of vaporized and condensed ash was below 0.1 mass{\%} in both units as determined with BLPI and with on-line monitoring. According to elemental mass size distributions no significant vaporization of any main element occurred including sodium and potassium. Wall deposit observed on refractory lining in BFB furnace was composed of sintered ash binding large ash and sand particles in the structure. No molten phases were detected to participate in the layer growth. Most quartz sand grains in the bed were covered by a thin layer of small ash particles, below 5 μm in size.",
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Latva-Somppi, J, Kauppinen, E, Valmari, T, Ahonen, P, Gurav, A, Kodas, T & Johanson, B 1998, 'The ash formation during co-combustion of wood and sludge in industrial fluidized bed boilers', Fuel Processing Technology, vol. 54, no. 1-3, pp. 79-94. https://doi.org/10.1016/S0378-3820(97)00061-1

The ash formation during co-combustion of wood and sludge in industrial fluidized bed boilers. / Latva-Somppi, Jouko (Corresponding Author); Kauppinen, Esko; Valmari, Tuomas; Ahonen, Petri; Gurav, Abhijit; Kodas, Toivo; Johanson, Bo.

In: Fuel Processing Technology, Vol. 54, No. 1-3, 1998, p. 79-94.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The ash formation during co-combustion of wood and sludge in industrial fluidized bed boilers

AU - Latva-Somppi, Jouko

AU - Kauppinen, Esko

AU - Valmari, Tuomas

AU - Ahonen, Petri

AU - Gurav, Abhijit

AU - Kodas, Toivo

AU - Johanson, Bo

PY - 1998

Y1 - 1998

N2 - Ashes from an industrial bubbling fluidized bed (BFB) and a circulating fluidized bed (CFB) boilers burning biomass and paper mill sludges are characterized. Bulk sampling was carried out with a simultaneous low pressure impactor sampling (BLPI) and with on-line monitoring of submicron ash gas phase size distribution. The principal ash forming mechanism was sintering of 1–10 μm inorganic paper filler particles, into 5–200 μm ash agglomerates. Despite few spherical particles no ash melting was detected. The fraction of vaporized and condensed ash was below 0.1 mass% in both units as determined with BLPI and with on-line monitoring. According to elemental mass size distributions no significant vaporization of any main element occurred including sodium and potassium. Wall deposit observed on refractory lining in BFB furnace was composed of sintered ash binding large ash and sand particles in the structure. No molten phases were detected to participate in the layer growth. Most quartz sand grains in the bed were covered by a thin layer of small ash particles, below 5 μm in size.

AB - Ashes from an industrial bubbling fluidized bed (BFB) and a circulating fluidized bed (CFB) boilers burning biomass and paper mill sludges are characterized. Bulk sampling was carried out with a simultaneous low pressure impactor sampling (BLPI) and with on-line monitoring of submicron ash gas phase size distribution. The principal ash forming mechanism was sintering of 1–10 μm inorganic paper filler particles, into 5–200 μm ash agglomerates. Despite few spherical particles no ash melting was detected. The fraction of vaporized and condensed ash was below 0.1 mass% in both units as determined with BLPI and with on-line monitoring. According to elemental mass size distributions no significant vaporization of any main element occurred including sodium and potassium. Wall deposit observed on refractory lining in BFB furnace was composed of sintered ash binding large ash and sand particles in the structure. No molten phases were detected to participate in the layer growth. Most quartz sand grains in the bed were covered by a thin layer of small ash particles, below 5 μm in size.

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DO - 10.1016/S0378-3820(97)00061-1

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JF - Fuel Processing Technology

SN - 0378-3820

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