Halide aerosols in circulating fluidised bed co-combustion

Role of coal bound kaolin

Pasi Vainikka (Corresponding Author), J. Silvennoinen, Raili Taipale, C. van Alphen, Antero Moilanen, R. Falcon, P. Yrjas, M. Hupa

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

An experimental campaign was carried out with a circulating fluidised bed (CFB) pilot scale combustor to study the role of coal bound kaolin in the fate of solid recovered fuel (SRF) originated halide aerosols. A combustion experiment was carried out with SRF–Spruce Bark mixture as a reference. High kaolinite coal and paper pigment kaolin, one at a time, were mixed with the SRF–Bark in increasing proportions until dp < 1 μm fine particles were absent as measured from 780 °C combustion gases by means of a dilution probe and low pressure impactor (LPI). This fine particle mode was absent after mixing sufficiently either coal or kaolin with SRF–Bark and only traces of water soluble alkali metal salts were found in the CFB fly ash. These conditions were achieved when kaolin was mixed with the SRF–Bark for 52 times on a molar basis compared to the Na + K initially found in the aerosols. This proportioning was found to be the same for the additive kaolin and coal bound kaolinite. Na and K in the fly ash seem to be bound chemically to the kaolin as alkali aluminosilicates rather than in water soluble alkali sulphates. This is indicated by their solubility behaviour.
Original languageEnglish
Pages (from-to)1738-1749
Number of pages12
JournalFuel Processing Technology
Volume92
Issue number9
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Kaolin
Coal
Aerosols
Kaolinite
Coal Ash
Fly ash
Alkalies
Aluminosilicates
Alkali metals
Alkali Metals
Combustors
Pigments
Dilution
Water
Solubility
Salts
Sulfates
Gases

Keywords

  • Co-combustion
  • kaolin
  • fluidised bed combustion
  • solid recovered fuel
  • aerosol
  • fine particle

Cite this

Vainikka, P., Silvennoinen, J., Taipale, R., van Alphen, C., Moilanen, A., Falcon, R., ... Hupa, M. (2011). Halide aerosols in circulating fluidised bed co-combustion: Role of coal bound kaolin. Fuel Processing Technology, 92(9), 1738-1749. https://doi.org/10.1016/j.fuproc.2011.04.027
Vainikka, Pasi ; Silvennoinen, J. ; Taipale, Raili ; van Alphen, C. ; Moilanen, Antero ; Falcon, R. ; Yrjas, P. ; Hupa, M. / Halide aerosols in circulating fluidised bed co-combustion : Role of coal bound kaolin. In: Fuel Processing Technology. 2011 ; Vol. 92, No. 9. pp. 1738-1749.
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abstract = "An experimental campaign was carried out with a circulating fluidised bed (CFB) pilot scale combustor to study the role of coal bound kaolin in the fate of solid recovered fuel (SRF) originated halide aerosols. A combustion experiment was carried out with SRF–Spruce Bark mixture as a reference. High kaolinite coal and paper pigment kaolin, one at a time, were mixed with the SRF–Bark in increasing proportions until dp < 1 μm fine particles were absent as measured from 780 °C combustion gases by means of a dilution probe and low pressure impactor (LPI). This fine particle mode was absent after mixing sufficiently either coal or kaolin with SRF–Bark and only traces of water soluble alkali metal salts were found in the CFB fly ash. These conditions were achieved when kaolin was mixed with the SRF–Bark for 52 times on a molar basis compared to the Na + K initially found in the aerosols. This proportioning was found to be the same for the additive kaolin and coal bound kaolinite. Na and K in the fly ash seem to be bound chemically to the kaolin as alkali aluminosilicates rather than in water soluble alkali sulphates. This is indicated by their solubility behaviour.",
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Vainikka, P, Silvennoinen, J, Taipale, R, van Alphen, C, Moilanen, A, Falcon, R, Yrjas, P & Hupa, M 2011, 'Halide aerosols in circulating fluidised bed co-combustion: Role of coal bound kaolin', Fuel Processing Technology, vol. 92, no. 9, pp. 1738-1749. https://doi.org/10.1016/j.fuproc.2011.04.027

Halide aerosols in circulating fluidised bed co-combustion : Role of coal bound kaolin. / Vainikka, Pasi (Corresponding Author); Silvennoinen, J.; Taipale, Raili; van Alphen, C.; Moilanen, Antero; Falcon, R.; Yrjas, P.; Hupa, M.

In: Fuel Processing Technology, Vol. 92, No. 9, 2011, p. 1738-1749.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Halide aerosols in circulating fluidised bed co-combustion

T2 - Role of coal bound kaolin

AU - Vainikka, Pasi

AU - Silvennoinen, J.

AU - Taipale, Raili

AU - van Alphen, C.

AU - Moilanen, Antero

AU - Falcon, R.

AU - Yrjas, P.

AU - Hupa, M.

PY - 2011

Y1 - 2011

N2 - An experimental campaign was carried out with a circulating fluidised bed (CFB) pilot scale combustor to study the role of coal bound kaolin in the fate of solid recovered fuel (SRF) originated halide aerosols. A combustion experiment was carried out with SRF–Spruce Bark mixture as a reference. High kaolinite coal and paper pigment kaolin, one at a time, were mixed with the SRF–Bark in increasing proportions until dp < 1 μm fine particles were absent as measured from 780 °C combustion gases by means of a dilution probe and low pressure impactor (LPI). This fine particle mode was absent after mixing sufficiently either coal or kaolin with SRF–Bark and only traces of water soluble alkali metal salts were found in the CFB fly ash. These conditions were achieved when kaolin was mixed with the SRF–Bark for 52 times on a molar basis compared to the Na + K initially found in the aerosols. This proportioning was found to be the same for the additive kaolin and coal bound kaolinite. Na and K in the fly ash seem to be bound chemically to the kaolin as alkali aluminosilicates rather than in water soluble alkali sulphates. This is indicated by their solubility behaviour.

AB - An experimental campaign was carried out with a circulating fluidised bed (CFB) pilot scale combustor to study the role of coal bound kaolin in the fate of solid recovered fuel (SRF) originated halide aerosols. A combustion experiment was carried out with SRF–Spruce Bark mixture as a reference. High kaolinite coal and paper pigment kaolin, one at a time, were mixed with the SRF–Bark in increasing proportions until dp < 1 μm fine particles were absent as measured from 780 °C combustion gases by means of a dilution probe and low pressure impactor (LPI). This fine particle mode was absent after mixing sufficiently either coal or kaolin with SRF–Bark and only traces of water soluble alkali metal salts were found in the CFB fly ash. These conditions were achieved when kaolin was mixed with the SRF–Bark for 52 times on a molar basis compared to the Na + K initially found in the aerosols. This proportioning was found to be the same for the additive kaolin and coal bound kaolinite. Na and K in the fly ash seem to be bound chemically to the kaolin as alkali aluminosilicates rather than in water soluble alkali sulphates. This is indicated by their solubility behaviour.

KW - Co-combustion

KW - kaolin

KW - fluidised bed combustion

KW - solid recovered fuel

KW - aerosol

KW - fine particle

U2 - 10.1016/j.fuproc.2011.04.027

DO - 10.1016/j.fuproc.2011.04.027

M3 - Article

VL - 92

SP - 1738

EP - 1749

JO - Fuel Processing Technology

JF - Fuel Processing Technology

SN - 0378-3820

IS - 9

ER -

Vainikka P, Silvennoinen J, Taipale R, van Alphen C, Moilanen A, Falcon R et al. Halide aerosols in circulating fluidised bed co-combustion: Role of coal bound kaolin. Fuel Processing Technology. 2011;92(9):1738-1749. https://doi.org/10.1016/j.fuproc.2011.04.027