Measuring the sintering tendency of ash by a laboratory method

Mikko Hupa, Bengt-Johan Skrifvars, Antero Moilanen

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)

Abstract

A laboratory method for measuring ash-sintering tendency was developed and applied to peat gasification ashes and to flue gas dust from recovery furnaces of kraft pulp mills. The method is based on compression-strength measurements of sintered pellets, and it can be used in two ways: for comparing the sintering tendency of different fly ashes collected from flue gases; and for testing the influence of different factors on fly ash sintering by means of synthetic samples.
The synthetic sample - which can be a laboratory ash or a mixture of chemical compounds - is first melted in a controlled gas atmosphere, and the slag obtained in this way is crushed and screened. The particle size of 100.mu.m is selected for pelletizing and sintering tests; variations in particle size are thus eliminated. If sintering of fly ash collected from flue gases is investigated, the pre-melt crushing and screening stage is excluded, and pellets are made directly from the collected fly ash.
Examples are presented of results obtained from synthetic samples and fly ash collected from flue gases, and from microscopic studies of sintered samples. Sintering is significantly affected by, for example, the potassium and chloride contents of the recovery boiler dust. Various peat-gasification ashes differed in their sintering tendency; the main variable was iron content.
Original languageEnglish
Pages (from-to)131-137
JournalJournal of the Institute of Energy
Volume62
Issue number452
Publication statusPublished - 1989
MoE publication typeA1 Journal article-refereed

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Ashes
ashes
fly ash
sintering
tendencies
Sintering
Fly ash
flue gases
Flue gases
peat
gasification
Peat
Gasification
pellets
Dust
dust
recovery
Particle size
Pelletizing
Recovery

Cite this

Hupa, M., Skrifvars, B-J., & Moilanen, A. (1989). Measuring the sintering tendency of ash by a laboratory method. Journal of the Institute of Energy, 62(452), 131-137.
Hupa, Mikko ; Skrifvars, Bengt-Johan ; Moilanen, Antero. / Measuring the sintering tendency of ash by a laboratory method. In: Journal of the Institute of Energy. 1989 ; Vol. 62, No. 452. pp. 131-137.
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abstract = "A laboratory method for measuring ash-sintering tendency was developed and applied to peat gasification ashes and to flue gas dust from recovery furnaces of kraft pulp mills. The method is based on compression-strength measurements of sintered pellets, and it can be used in two ways: for comparing the sintering tendency of different fly ashes collected from flue gases; and for testing the influence of different factors on fly ash sintering by means of synthetic samples. The synthetic sample - which can be a laboratory ash or a mixture of chemical compounds - is first melted in a controlled gas atmosphere, and the slag obtained in this way is crushed and screened. The particle size of 100.mu.m is selected for pelletizing and sintering tests; variations in particle size are thus eliminated. If sintering of fly ash collected from flue gases is investigated, the pre-melt crushing and screening stage is excluded, and pellets are made directly from the collected fly ash. Examples are presented of results obtained from synthetic samples and fly ash collected from flue gases, and from microscopic studies of sintered samples. Sintering is significantly affected by, for example, the potassium and chloride contents of the recovery boiler dust. Various peat-gasification ashes differed in their sintering tendency; the main variable was iron content.",
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Hupa, M, Skrifvars, B-J & Moilanen, A 1989, 'Measuring the sintering tendency of ash by a laboratory method', Journal of the Institute of Energy, vol. 62, no. 452, pp. 131-137.

Measuring the sintering tendency of ash by a laboratory method. / Hupa, Mikko; Skrifvars, Bengt-Johan; Moilanen, Antero.

In: Journal of the Institute of Energy, Vol. 62, No. 452, 1989, p. 131-137.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Measuring the sintering tendency of ash by a laboratory method

AU - Hupa, Mikko

AU - Skrifvars, Bengt-Johan

AU - Moilanen, Antero

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N2 - A laboratory method for measuring ash-sintering tendency was developed and applied to peat gasification ashes and to flue gas dust from recovery furnaces of kraft pulp mills. The method is based on compression-strength measurements of sintered pellets, and it can be used in two ways: for comparing the sintering tendency of different fly ashes collected from flue gases; and for testing the influence of different factors on fly ash sintering by means of synthetic samples. The synthetic sample - which can be a laboratory ash or a mixture of chemical compounds - is first melted in a controlled gas atmosphere, and the slag obtained in this way is crushed and screened. The particle size of 100.mu.m is selected for pelletizing and sintering tests; variations in particle size are thus eliminated. If sintering of fly ash collected from flue gases is investigated, the pre-melt crushing and screening stage is excluded, and pellets are made directly from the collected fly ash. Examples are presented of results obtained from synthetic samples and fly ash collected from flue gases, and from microscopic studies of sintered samples. Sintering is significantly affected by, for example, the potassium and chloride contents of the recovery boiler dust. Various peat-gasification ashes differed in their sintering tendency; the main variable was iron content.

AB - A laboratory method for measuring ash-sintering tendency was developed and applied to peat gasification ashes and to flue gas dust from recovery furnaces of kraft pulp mills. The method is based on compression-strength measurements of sintered pellets, and it can be used in two ways: for comparing the sintering tendency of different fly ashes collected from flue gases; and for testing the influence of different factors on fly ash sintering by means of synthetic samples. The synthetic sample - which can be a laboratory ash or a mixture of chemical compounds - is first melted in a controlled gas atmosphere, and the slag obtained in this way is crushed and screened. The particle size of 100.mu.m is selected for pelletizing and sintering tests; variations in particle size are thus eliminated. If sintering of fly ash collected from flue gases is investigated, the pre-melt crushing and screening stage is excluded, and pellets are made directly from the collected fly ash. Examples are presented of results obtained from synthetic samples and fly ash collected from flue gases, and from microscopic studies of sintered samples. Sintering is significantly affected by, for example, the potassium and chloride contents of the recovery boiler dust. Various peat-gasification ashes differed in their sintering tendency; the main variable was iron content.

M3 - Article

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