Ultrafine ash particle formation during waste sludge incineration in fluidized bed reactors

Jouko Latva-Somppi, Esko Kauppinen, Juha Kurkela, Unto Tapper, Marcus Öhman, Anders Nordin, Bo Johanson

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Ash formation during the bubbling fluidized bed (BFB) combustion of bark and pulp mill sludge has been studied on an industrial and bench scale. During co-firing in an industrial BFB a submicron fly ash mode was formed via condensation of volatilized K, Na, Sand Cl species at 0.05–0.3 μm.
The submicron mass mode below 0.3 μm made up 2.2–5.0% of the fly ash, while the share of the supermicron mass fraction was 93.6–97.2%. Elements depleted in the ultra fine ash were Ca, Si, Al, Mg, Fe, Mn, P and Ti. The bench-scale test showed that the ultrafine particle concentration was increased by a higher bed temperature and decreased due to sludge moisture. As, Cd, Pb and Rb were enriched in the ultrafine ash on a bench scale, while Ba, Co, Sr and V were depleted.
Cu and Zn were enriched in the ultrafine ash during the combustion of dried sludge, but not when wet sludge was fired. Micron-size ash particles composed of non-volatile species, Ca, Si, Mg, Al, P and Mn, adhered to the bed sand, presumably by surface forces, and sintering densified the ash layer.
Original languageEnglish
Pages (from-to)433-455
JournalCombustion Science and Technology
Volume134
Issue number1-6
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

Fingerprint

Ashes
incinerators
sludge
Waste incineration
Sewage sludge
ashes
Fluidized beds
beds
reactors
Coal Ash
seats
fly ash
Fly ash
sands
Sand
Fluidized bed combustion
Paper and pulp mills
moisture
Ultrafine
Condensation

Keywords

  • fluidized beds

Cite this

Latva-Somppi, Jouko ; Kauppinen, Esko ; Kurkela, Juha ; Tapper, Unto ; Öhman, Marcus ; Nordin, Anders ; Johanson, Bo. / Ultrafine ash particle formation during waste sludge incineration in fluidized bed reactors. In: Combustion Science and Technology. 1998 ; Vol. 134, No. 1-6. pp. 433-455.
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abstract = "Ash formation during the bubbling fluidized bed (BFB) combustion of bark and pulp mill sludge has been studied on an industrial and bench scale. During co-firing in an industrial BFB a submicron fly ash mode was formed via condensation of volatilized K, Na, Sand Cl species at 0.05–0.3 μm. The submicron mass mode below 0.3 μm made up 2.2–5.0{\%} of the fly ash, while the share of the supermicron mass fraction was 93.6–97.2{\%}. Elements depleted in the ultra fine ash were Ca, Si, Al, Mg, Fe, Mn, P and Ti. The bench-scale test showed that the ultrafine particle concentration was increased by a higher bed temperature and decreased due to sludge moisture. As, Cd, Pb and Rb were enriched in the ultrafine ash on a bench scale, while Ba, Co, Sr and V were depleted. Cu and Zn were enriched in the ultrafine ash during the combustion of dried sludge, but not when wet sludge was fired. Micron-size ash particles composed of non-volatile species, Ca, Si, Mg, Al, P and Mn, adhered to the bed sand, presumably by surface forces, and sintering densified the ash layer.",
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author = "Jouko Latva-Somppi and Esko Kauppinen and Juha Kurkela and Unto Tapper and Marcus {\"O}hman and Anders Nordin and Bo Johanson",
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Latva-Somppi, J, Kauppinen, E, Kurkela, J, Tapper, U, Öhman, M, Nordin, A & Johanson, B 1998, 'Ultrafine ash particle formation during waste sludge incineration in fluidized bed reactors', Combustion Science and Technology, vol. 134, no. 1-6, pp. 433-455. https://doi.org/10.1080/00102209808924144

Ultrafine ash particle formation during waste sludge incineration in fluidized bed reactors. / Latva-Somppi, Jouko; Kauppinen, Esko; Kurkela, Juha; Tapper, Unto; Öhman, Marcus; Nordin, Anders; Johanson, Bo.

In: Combustion Science and Technology, Vol. 134, No. 1-6, 1998, p. 433-455.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Ultrafine ash particle formation during waste sludge incineration in fluidized bed reactors

AU - Latva-Somppi, Jouko

AU - Kauppinen, Esko

AU - Kurkela, Juha

AU - Tapper, Unto

AU - Öhman, Marcus

AU - Nordin, Anders

AU - Johanson, Bo

PY - 1998

Y1 - 1998

N2 - Ash formation during the bubbling fluidized bed (BFB) combustion of bark and pulp mill sludge has been studied on an industrial and bench scale. During co-firing in an industrial BFB a submicron fly ash mode was formed via condensation of volatilized K, Na, Sand Cl species at 0.05–0.3 μm. The submicron mass mode below 0.3 μm made up 2.2–5.0% of the fly ash, while the share of the supermicron mass fraction was 93.6–97.2%. Elements depleted in the ultra fine ash were Ca, Si, Al, Mg, Fe, Mn, P and Ti. The bench-scale test showed that the ultrafine particle concentration was increased by a higher bed temperature and decreased due to sludge moisture. As, Cd, Pb and Rb were enriched in the ultrafine ash on a bench scale, while Ba, Co, Sr and V were depleted. Cu and Zn were enriched in the ultrafine ash during the combustion of dried sludge, but not when wet sludge was fired. Micron-size ash particles composed of non-volatile species, Ca, Si, Mg, Al, P and Mn, adhered to the bed sand, presumably by surface forces, and sintering densified the ash layer.

AB - Ash formation during the bubbling fluidized bed (BFB) combustion of bark and pulp mill sludge has been studied on an industrial and bench scale. During co-firing in an industrial BFB a submicron fly ash mode was formed via condensation of volatilized K, Na, Sand Cl species at 0.05–0.3 μm. The submicron mass mode below 0.3 μm made up 2.2–5.0% of the fly ash, while the share of the supermicron mass fraction was 93.6–97.2%. Elements depleted in the ultra fine ash were Ca, Si, Al, Mg, Fe, Mn, P and Ti. The bench-scale test showed that the ultrafine particle concentration was increased by a higher bed temperature and decreased due to sludge moisture. As, Cd, Pb and Rb were enriched in the ultrafine ash on a bench scale, while Ba, Co, Sr and V were depleted. Cu and Zn were enriched in the ultrafine ash during the combustion of dried sludge, but not when wet sludge was fired. Micron-size ash particles composed of non-volatile species, Ca, Si, Mg, Al, P and Mn, adhered to the bed sand, presumably by surface forces, and sintering densified the ash layer.

KW - fluidized beds

U2 - 10.1080/00102209808924144

DO - 10.1080/00102209808924144

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SP - 433

EP - 455

JO - Combustion Science and Technology

JF - Combustion Science and Technology

SN - 0010-2202

IS - 1-6

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