Towards controlling PCDD/F production in a multi-fuel fired BFB boiler using two sulfur addition strategies: Part III: Cu speciation in the fly ash

Cyril Bajamundi (Corresponding Author), Pasi Vainikka, I. Hyytiäinen, Kirsi Korpijärvi, M. Lahtinen, W. Klysubun, J. Konttinen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

PCDD/F abatement strategies - sulfur pellet addition and peat co-combustion - were tested for a BFB boiler facility utilizing SRF-bark-sludge as fuel. In this paper chemical and physical analyses of electrostatic precipitator (ESP) fly ashes were used to explain the differences in the performance of these strategies. These analyses revealed a difference between the coarse and fine fly ashes collected in the ESP. Chemical analysis of the fine fly ashes revealed high concentration of easily volatilized elements while the SEM micrographs showed that fine ash are composed of clusters of spherical particles, thereby leading to a conclusion that fine ashes were originally in a gas phase in the high temperature zones of the boiler. Variation in the distribution of active and passive forms of Cu in fly ashes was revealed using X-ray absorption spectroscopy (XANES mode). It was also found that peat co-combustion led to increased formation of Cu oxides that may act as active catalysts in de novo synthesis. Furthermore, XANES revealed the formation of CuSO4 for all the test cases. By applying the empirical ratio between mole fractions of the active and passive species of Cu, the role of Cu speciation to PCDD/F production was emphasized. It is concluded that sulfur pellet addition is more effective than peat addition as a PCDD/F abatement strategy for the BFB facility understudy.
Original languageEnglish
Pages (from-to)178-186
Number of pages9
JournalFuel
Volume132
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Coal Ash
Ashes
Fly ash
Sulfur
Boilers
Peat
Electrostatic precipitators
X ray absorption spectroscopy
Oxides
Gases
Scanning electron microscopy
Catalysts
Chemical analysis
Temperature

Keywords

  • PCDD/F
  • emissions
  • bubbling fluidized bed boilers
  • copper
  • sulfurs
  • spectroscopy

Cite this

Bajamundi, Cyril ; Vainikka, Pasi ; Hyytiäinen, I. ; Korpijärvi, Kirsi ; Lahtinen, M. ; Klysubun, W. ; Konttinen, J. / Towards controlling PCDD/F production in a multi-fuel fired BFB boiler using two sulfur addition strategies : Part III: Cu speciation in the fly ash. In: Fuel. 2014 ; Vol. 132. pp. 178-186.
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abstract = "PCDD/F abatement strategies - sulfur pellet addition and peat co-combustion - were tested for a BFB boiler facility utilizing SRF-bark-sludge as fuel. In this paper chemical and physical analyses of electrostatic precipitator (ESP) fly ashes were used to explain the differences in the performance of these strategies. These analyses revealed a difference between the coarse and fine fly ashes collected in the ESP. Chemical analysis of the fine fly ashes revealed high concentration of easily volatilized elements while the SEM micrographs showed that fine ash are composed of clusters of spherical particles, thereby leading to a conclusion that fine ashes were originally in a gas phase in the high temperature zones of the boiler. Variation in the distribution of active and passive forms of Cu in fly ashes was revealed using X-ray absorption spectroscopy (XANES mode). It was also found that peat co-combustion led to increased formation of Cu oxides that may act as active catalysts in de novo synthesis. Furthermore, XANES revealed the formation of CuSO4 for all the test cases. By applying the empirical ratio between mole fractions of the active and passive species of Cu, the role of Cu speciation to PCDD/F production was emphasized. It is concluded that sulfur pellet addition is more effective than peat addition as a PCDD/F abatement strategy for the BFB facility understudy.",
keywords = "PCDD/F, emissions, bubbling fluidized bed boilers, copper, sulfurs, spectroscopy",
author = "Cyril Bajamundi and Pasi Vainikka and I. Hyyti{\"a}inen and Kirsi Korpij{\"a}rvi and M. Lahtinen and W. Klysubun and J. Konttinen",
year = "2014",
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language = "English",
volume = "132",
pages = "178--186",
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Towards controlling PCDD/F production in a multi-fuel fired BFB boiler using two sulfur addition strategies : Part III: Cu speciation in the fly ash. / Bajamundi, Cyril (Corresponding Author); Vainikka, Pasi; Hyytiäinen, I.; Korpijärvi, Kirsi; Lahtinen, M.; Klysubun, W.; Konttinen, J.

In: Fuel, Vol. 132, 2014, p. 178-186.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Towards controlling PCDD/F production in a multi-fuel fired BFB boiler using two sulfur addition strategies

T2 - Part III: Cu speciation in the fly ash

AU - Bajamundi, Cyril

AU - Vainikka, Pasi

AU - Hyytiäinen, I.

AU - Korpijärvi, Kirsi

AU - Lahtinen, M.

AU - Klysubun, W.

AU - Konttinen, J.

PY - 2014

Y1 - 2014

N2 - PCDD/F abatement strategies - sulfur pellet addition and peat co-combustion - were tested for a BFB boiler facility utilizing SRF-bark-sludge as fuel. In this paper chemical and physical analyses of electrostatic precipitator (ESP) fly ashes were used to explain the differences in the performance of these strategies. These analyses revealed a difference between the coarse and fine fly ashes collected in the ESP. Chemical analysis of the fine fly ashes revealed high concentration of easily volatilized elements while the SEM micrographs showed that fine ash are composed of clusters of spherical particles, thereby leading to a conclusion that fine ashes were originally in a gas phase in the high temperature zones of the boiler. Variation in the distribution of active and passive forms of Cu in fly ashes was revealed using X-ray absorption spectroscopy (XANES mode). It was also found that peat co-combustion led to increased formation of Cu oxides that may act as active catalysts in de novo synthesis. Furthermore, XANES revealed the formation of CuSO4 for all the test cases. By applying the empirical ratio between mole fractions of the active and passive species of Cu, the role of Cu speciation to PCDD/F production was emphasized. It is concluded that sulfur pellet addition is more effective than peat addition as a PCDD/F abatement strategy for the BFB facility understudy.

AB - PCDD/F abatement strategies - sulfur pellet addition and peat co-combustion - were tested for a BFB boiler facility utilizing SRF-bark-sludge as fuel. In this paper chemical and physical analyses of electrostatic precipitator (ESP) fly ashes were used to explain the differences in the performance of these strategies. These analyses revealed a difference between the coarse and fine fly ashes collected in the ESP. Chemical analysis of the fine fly ashes revealed high concentration of easily volatilized elements while the SEM micrographs showed that fine ash are composed of clusters of spherical particles, thereby leading to a conclusion that fine ashes were originally in a gas phase in the high temperature zones of the boiler. Variation in the distribution of active and passive forms of Cu in fly ashes was revealed using X-ray absorption spectroscopy (XANES mode). It was also found that peat co-combustion led to increased formation of Cu oxides that may act as active catalysts in de novo synthesis. Furthermore, XANES revealed the formation of CuSO4 for all the test cases. By applying the empirical ratio between mole fractions of the active and passive species of Cu, the role of Cu speciation to PCDD/F production was emphasized. It is concluded that sulfur pellet addition is more effective than peat addition as a PCDD/F abatement strategy for the BFB facility understudy.

KW - PCDD/F

KW - emissions

KW - bubbling fluidized bed boilers

KW - copper

KW - sulfurs

KW - spectroscopy

U2 - 10.1016/j.fuel.2014.04.075

DO - 10.1016/j.fuel.2014.04.075

M3 - Article

VL - 132

SP - 178

EP - 186

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -