Demonstration of plasma excited atomic resonance line spectroscopy for on-line measurement of alkali metals in a 20 kW bubbling fluidized bed

Ville Häyrinen (Corresponding Author), Rolf Hernberg, Martti Aho

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

An instrument based on Plasma Excited Atomic Resonance Line Spectroscopy (PEARLS) was applied to measurements of vapor and aerosol phase Na and K in atmospheric combustion conditions. The PEARLS method is based on dissociation of alkali compounds by a direct current plasma torch and subsequent determination of alkali concentration by atomic absorption spectroscopy. The measurements were carried out in a 20 kW bubbling fluidized bed reactor during co-combustion of biomass and coal. The capability of the instrument to operate under atmospheric high-ash conditions was demonstrated. The analysis was made directly from hot (880 °C) particulate laden sample gas. The fuels were pine bark mixed with South African coal and Finnish forest residue mixed with Polish lignite. Thirty percent addition of coal or lignite to biomass reduced measured alkali concentrations by 44–64%. The reduction is explained by conversion of alkali chlorides and hydroxides to sulfates and silicates.
Original languageEnglish
Pages (from-to)791 - 797
Number of pages7
JournalFuel
Volume83
Issue number7-8
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Alkali Metals
Coal
Alkali metals
Fluidized beds
Alkalies
Demonstrations
Spectroscopy
Lignite
Ashes
Plasmas
Biomass
Plasma torches
Atomic spectroscopy
Absorption spectroscopy
Hydroxides
Aerosols
Silicates
Vapors
Sulfates
Chlorides

Keywords

  • alkali measurement
  • DC plasma
  • absorption spectroscopy
  • co-combustion
  • corrosion
  • fluidized beds

Cite this

Häyrinen, Ville ; Hernberg, Rolf ; Aho, Martti. / Demonstration of plasma excited atomic resonance line spectroscopy for on-line measurement of alkali metals in a 20 kW bubbling fluidized bed. In: Fuel. 2004 ; Vol. 83, No. 7-8. pp. 791 - 797.
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abstract = "An instrument based on Plasma Excited Atomic Resonance Line Spectroscopy (PEARLS) was applied to measurements of vapor and aerosol phase Na and K in atmospheric combustion conditions. The PEARLS method is based on dissociation of alkali compounds by a direct current plasma torch and subsequent determination of alkali concentration by atomic absorption spectroscopy. The measurements were carried out in a 20 kW bubbling fluidized bed reactor during co-combustion of biomass and coal. The capability of the instrument to operate under atmospheric high-ash conditions was demonstrated. The analysis was made directly from hot (880 °C) particulate laden sample gas. The fuels were pine bark mixed with South African coal and Finnish forest residue mixed with Polish lignite. Thirty percent addition of coal or lignite to biomass reduced measured alkali concentrations by 44–64{\%}. The reduction is explained by conversion of alkali chlorides and hydroxides to sulfates and silicates.",
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Demonstration of plasma excited atomic resonance line spectroscopy for on-line measurement of alkali metals in a 20 kW bubbling fluidized bed. / Häyrinen, Ville (Corresponding Author); Hernberg, Rolf; Aho, Martti.

In: Fuel, Vol. 83, No. 7-8, 2004, p. 791 - 797.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Demonstration of plasma excited atomic resonance line spectroscopy for on-line measurement of alkali metals in a 20 kW bubbling fluidized bed

AU - Häyrinen, Ville

AU - Hernberg, Rolf

AU - Aho, Martti

PY - 2004

Y1 - 2004

N2 - An instrument based on Plasma Excited Atomic Resonance Line Spectroscopy (PEARLS) was applied to measurements of vapor and aerosol phase Na and K in atmospheric combustion conditions. The PEARLS method is based on dissociation of alkali compounds by a direct current plasma torch and subsequent determination of alkali concentration by atomic absorption spectroscopy. The measurements were carried out in a 20 kW bubbling fluidized bed reactor during co-combustion of biomass and coal. The capability of the instrument to operate under atmospheric high-ash conditions was demonstrated. The analysis was made directly from hot (880 °C) particulate laden sample gas. The fuels were pine bark mixed with South African coal and Finnish forest residue mixed with Polish lignite. Thirty percent addition of coal or lignite to biomass reduced measured alkali concentrations by 44–64%. The reduction is explained by conversion of alkali chlorides and hydroxides to sulfates and silicates.

AB - An instrument based on Plasma Excited Atomic Resonance Line Spectroscopy (PEARLS) was applied to measurements of vapor and aerosol phase Na and K in atmospheric combustion conditions. The PEARLS method is based on dissociation of alkali compounds by a direct current plasma torch and subsequent determination of alkali concentration by atomic absorption spectroscopy. The measurements were carried out in a 20 kW bubbling fluidized bed reactor during co-combustion of biomass and coal. The capability of the instrument to operate under atmospheric high-ash conditions was demonstrated. The analysis was made directly from hot (880 °C) particulate laden sample gas. The fuels were pine bark mixed with South African coal and Finnish forest residue mixed with Polish lignite. Thirty percent addition of coal or lignite to biomass reduced measured alkali concentrations by 44–64%. The reduction is explained by conversion of alkali chlorides and hydroxides to sulfates and silicates.

KW - alkali measurement

KW - DC plasma

KW - absorption spectroscopy

KW - co-combustion

KW - corrosion

KW - fluidized beds

U2 - 10.1016/j.fuel.2003.10.013

DO - 10.1016/j.fuel.2003.10.013

M3 - Article

VL - 83

SP - 791

EP - 797

JO - Fuel

JF - Fuel

SN - 0016-2361

IS - 7-8

ER -