Investigation of the gypsum quality at three full-scale wet flue gas desulphurisation plants

Brian Brun Hansen, Søren Kiil, Jan Erik Johnsson

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In the present study the gypsum (CaSO4·2H2O) quality at three full-scale wet flue gas desulphurisation (FGD) plants and a pilot plant were examined and compared. Gypsum quality can be expressed in terms of moisture content (particle size and morphology dependent) and the concentration of residual limestone and other impurities. The particle size distributions (PSD) in the holding tanks of the investigated plants were similar, apart from a slightly higher fraction of small particles in the full-scale plants. These high levels of small particles could originate from nucleation, attrition or accumulation of fly ash and impurities from the sorbent. The crystal morphology obtained in the pilot plant was columnar with distinct crystal faces as opposed to the rounded shapes found at the full-scale plants. All the investigated full-scale plants consistently produced high quality gypsum (High purity, low moisture content and low impurity content). An episode concerning a sudden deterioration in the gypsum dewatering properties was furthermore investigated, and a change in crystal morphology, as well as an increased impurity content (aluminium, iron and fluoride), was detected.
Original languageEnglish
JournalFuel
Volume90
Issue number10
Pages (from-to)2965-2973
ISSN0016-2361
DOIs
Publication statusPublished - 2011

Keywords

  • FDG
  • PSD
  • Gypsum
  • Calcium sulphate
  • Full-scale

Cite this

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title = "Investigation of the gypsum quality at three full-scale wet flue gas desulphurisation plants",
abstract = "In the present study the gypsum (CaSO4·2H2O) quality at three full-scale wet flue gas desulphurisation (FGD) plants and a pilot plant were examined and compared. Gypsum quality can be expressed in terms of moisture content (particle size and morphology dependent) and the concentration of residual limestone and other impurities. The particle size distributions (PSD) in the holding tanks of the investigated plants were similar, apart from a slightly higher fraction of small particles in the full-scale plants. These high levels of small particles could originate from nucleation, attrition or accumulation of fly ash and impurities from the sorbent. The crystal morphology obtained in the pilot plant was columnar with distinct crystal faces as opposed to the rounded shapes found at the full-scale plants. All the investigated full-scale plants consistently produced high quality gypsum (High purity, low moisture content and low impurity content). An episode concerning a sudden deterioration in the gypsum dewatering properties was furthermore investigated, and a change in crystal morphology, as well as an increased impurity content (aluminium, iron and fluoride), was detected.",
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author = "Hansen, {Brian Brun} and S{\o}ren Kiil and Johnsson, {Jan Erik}",
year = "2011",
doi = "10.1016/j.fuel.2011.05.008",
language = "English",
volume = "90",
pages = "2965--2973",
journal = "Fuel",
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Investigation of the gypsum quality at three full-scale wet flue gas desulphurisation plants. / Hansen, Brian Brun; Kiil, Søren; Johnsson, Jan Erik.

In: Fuel, Vol. 90, No. 10, 2011, p. 2965-2973.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Investigation of the gypsum quality at three full-scale wet flue gas desulphurisation plants

AU - Hansen, Brian Brun

AU - Kiil, Søren

AU - Johnsson, Jan Erik

PY - 2011

Y1 - 2011

N2 - In the present study the gypsum (CaSO4·2H2O) quality at three full-scale wet flue gas desulphurisation (FGD) plants and a pilot plant were examined and compared. Gypsum quality can be expressed in terms of moisture content (particle size and morphology dependent) and the concentration of residual limestone and other impurities. The particle size distributions (PSD) in the holding tanks of the investigated plants were similar, apart from a slightly higher fraction of small particles in the full-scale plants. These high levels of small particles could originate from nucleation, attrition or accumulation of fly ash and impurities from the sorbent. The crystal morphology obtained in the pilot plant was columnar with distinct crystal faces as opposed to the rounded shapes found at the full-scale plants. All the investigated full-scale plants consistently produced high quality gypsum (High purity, low moisture content and low impurity content). An episode concerning a sudden deterioration in the gypsum dewatering properties was furthermore investigated, and a change in crystal morphology, as well as an increased impurity content (aluminium, iron and fluoride), was detected.

AB - In the present study the gypsum (CaSO4·2H2O) quality at three full-scale wet flue gas desulphurisation (FGD) plants and a pilot plant were examined and compared. Gypsum quality can be expressed in terms of moisture content (particle size and morphology dependent) and the concentration of residual limestone and other impurities. The particle size distributions (PSD) in the holding tanks of the investigated plants were similar, apart from a slightly higher fraction of small particles in the full-scale plants. These high levels of small particles could originate from nucleation, attrition or accumulation of fly ash and impurities from the sorbent. The crystal morphology obtained in the pilot plant was columnar with distinct crystal faces as opposed to the rounded shapes found at the full-scale plants. All the investigated full-scale plants consistently produced high quality gypsum (High purity, low moisture content and low impurity content). An episode concerning a sudden deterioration in the gypsum dewatering properties was furthermore investigated, and a change in crystal morphology, as well as an increased impurity content (aluminium, iron and fluoride), was detected.

KW - FDG

KW - PSD

KW - Gypsum

KW - Calcium sulphate

KW - Full-scale

U2 - 10.1016/j.fuel.2011.05.008

DO - 10.1016/j.fuel.2011.05.008

M3 - Journal article

VL - 90

SP - 2965

EP - 2973

JO - Fuel

JF - Fuel

SN - 0016-2361

IS - 10

ER -