A field study on ash behavior during circulating fluidized-bed combustion of biomass

1. Ash formation

Tuomas Valmari, Terttaliisa Lind, George Sfiris, Kristina Nilsson, Willy Maenhaut, E.I. Kauppinen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Ash formation was studied experimentally during combustion of forest residue and willow in a 35 MW circulating fluidized-bed co-generation plant. Ash particles and vapors were sampled downstream of the process cyclone at flue gas temperatures of 810−850 °C. Inorganic vapors and fly ash particles were collected separately on filters. Size-classified fly ash particle samples were collected with an impactor. Elemental analysis methods and electron microscopy were used for ash characterization. During combustion of forest residue, about 30−40% of the total ash and a similar percentage of Ca and P was attached on the bed-material particles and were eventually removed from the bed along with bottom ash. K was retained with a higher efficiency (about 50%). S and Cl were volatilized in the furnace and were not retained in the bed. During combustion of forest residue, 80% of S had already reacted with species present in supermicrometer ash particles when detected after the process cyclone at 810−850 °C. When willow was combusted, about one-half of the sulfur remained as SO2. More than one-half of the particle-phase S was present as alkali sulfate fine particles that were almost nonexistent during forest residue combustion. Cl was present as gaseous species (KCl and presumably HCl) at 810−850 °C with both fuels.
Original languageEnglish
Pages (from-to)379-389
Number of pages11
JournalEnergy & Fuels
Volume13
Issue number2
DOIs
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed

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Ashes
Fluidized bed combustion
Coal Ash
Biomass
Salix
Fly ash
Vapors
Cogeneration plants
Alkalies
Flue gases
Sulfur
Fluidized beds
Electron microscopy
Sulfates
Furnaces

Keywords

  • fluidized beds

Cite this

Valmari, T., Lind, T., Sfiris, G., Nilsson, K., Maenhaut, W., & Kauppinen, E. I. (1999). A field study on ash behavior during circulating fluidized-bed combustion of biomass: 1. Ash formation. Energy & Fuels, 13(2), 379-389. https://doi.org/10.1021/ef980085d
Valmari, Tuomas ; Lind, Terttaliisa ; Sfiris, George ; Nilsson, Kristina ; Maenhaut, Willy ; Kauppinen, E.I. / A field study on ash behavior during circulating fluidized-bed combustion of biomass : 1. Ash formation. In: Energy & Fuels. 1999 ; Vol. 13, No. 2. pp. 379-389.
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abstract = "Ash formation was studied experimentally during combustion of forest residue and willow in a 35 MW circulating fluidized-bed co-generation plant. Ash particles and vapors were sampled downstream of the process cyclone at flue gas temperatures of 810−850 °C. Inorganic vapors and fly ash particles were collected separately on filters. Size-classified fly ash particle samples were collected with an impactor. Elemental analysis methods and electron microscopy were used for ash characterization. During combustion of forest residue, about 30−40{\%} of the total ash and a similar percentage of Ca and P was attached on the bed-material particles and were eventually removed from the bed along with bottom ash. K was retained with a higher efficiency (about 50{\%}). S and Cl were volatilized in the furnace and were not retained in the bed. During combustion of forest residue, 80{\%} of S had already reacted with species present in supermicrometer ash particles when detected after the process cyclone at 810−850 °C. When willow was combusted, about one-half of the sulfur remained as SO2. More than one-half of the particle-phase S was present as alkali sulfate fine particles that were almost nonexistent during forest residue combustion. Cl was present as gaseous species (KCl and presumably HCl) at 810−850 °C with both fuels.",
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Valmari, T, Lind, T, Sfiris, G, Nilsson, K, Maenhaut, W & Kauppinen, EI 1999, 'A field study on ash behavior during circulating fluidized-bed combustion of biomass: 1. Ash formation', Energy & Fuels, vol. 13, no. 2, pp. 379-389. https://doi.org/10.1021/ef980085d

A field study on ash behavior during circulating fluidized-bed combustion of biomass : 1. Ash formation. / Valmari, Tuomas; Lind, Terttaliisa; Sfiris, George; Nilsson, Kristina; Maenhaut, Willy; Kauppinen, E.I. (Corresponding Author).

In: Energy & Fuels, Vol. 13, No. 2, 1999, p. 379-389.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - A field study on ash behavior during circulating fluidized-bed combustion of biomass

T2 - 1. Ash formation

AU - Valmari, Tuomas

AU - Lind, Terttaliisa

AU - Sfiris, George

AU - Nilsson, Kristina

AU - Maenhaut, Willy

AU - Kauppinen, E.I.

PY - 1999

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AB - Ash formation was studied experimentally during combustion of forest residue and willow in a 35 MW circulating fluidized-bed co-generation plant. Ash particles and vapors were sampled downstream of the process cyclone at flue gas temperatures of 810−850 °C. Inorganic vapors and fly ash particles were collected separately on filters. Size-classified fly ash particle samples were collected with an impactor. Elemental analysis methods and electron microscopy were used for ash characterization. During combustion of forest residue, about 30−40% of the total ash and a similar percentage of Ca and P was attached on the bed-material particles and were eventually removed from the bed along with bottom ash. K was retained with a higher efficiency (about 50%). S and Cl were volatilized in the furnace and were not retained in the bed. During combustion of forest residue, 80% of S had already reacted with species present in supermicrometer ash particles when detected after the process cyclone at 810−850 °C. When willow was combusted, about one-half of the sulfur remained as SO2. More than one-half of the particle-phase S was present as alkali sulfate fine particles that were almost nonexistent during forest residue combustion. Cl was present as gaseous species (KCl and presumably HCl) at 810−850 °C with both fuels.

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JO - Energy & Fuels

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