Partitioning of trace elements in pressurised fluidised-bed combustion

Wahab Mojtahedi (Corresponding Author), Matti Nieminen, Seppo Hulkkonen, Antero Jahkola

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

The relative distribution of a few selected trace elements in the effluent streams of a 15 cm diameter pressurised fluidised-bed combustor is investigated. The effect of in-bed desulphurisation as well as high-temperature, high-pressure particle removal on trace element emissions is studied and some of the results are reported in this paper.

An extractive sampling technique, used to measure the trace element concentrations in the vapour phase, is briefly discussed. This was designed to enable a more accurate assessment of the volatilisation of selected trace elements in the bed.
The results show that a relatively small proportion of the fuel-bound trace metals investigated leaves the combustor in the vapour phase. A much greater proportion exists in the form of fine solid particles (the particulates).
Samples taken from the bottom ash, the cyclone catch and the filter dust, and analysed for the trace element content, show that more than 99% of most metals studied remain in the bed or are removed with the solid particles elutriated from the bed.
It seems that an efficient particulate control system will reduce the trace metal concentrations in the flue gas to very low levels.

Original languageEnglish
Pages (from-to)83-97
JournalFuel Processing Technology
Volume26
Issue number2
DOIs
Publication statusPublished - 1990
MoE publication typeA1 Journal article-refereed

Fingerprint

Trace Elements
Trace elements
Ashes
Combustors
Vapors
Coal Ash
Vaporization
Flue gases
Dust
Effluents
Metals
Sampling
Control systems
Temperature
Trace metals

Keywords

  • fluidized bed combustion
  • fluidized beds

Cite this

Mojtahedi, Wahab ; Nieminen, Matti ; Hulkkonen, Seppo ; Jahkola, Antero. / Partitioning of trace elements in pressurised fluidised-bed combustion. In: Fuel Processing Technology. 1990 ; Vol. 26, No. 2. pp. 83-97.
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title = "Partitioning of trace elements in pressurised fluidised-bed combustion",
abstract = "The relative distribution of a few selected trace elements in the effluent streams of a 15 cm diameter pressurised fluidised-bed combustor is investigated. The effect of in-bed desulphurisation as well as high-temperature, high-pressure particle removal on trace element emissions is studied and some of the results are reported in this paper.An extractive sampling technique, used to measure the trace element concentrations in the vapour phase, is briefly discussed. This was designed to enable a more accurate assessment of the volatilisation of selected trace elements in the bed. The results show that a relatively small proportion of the fuel-bound trace metals investigated leaves the combustor in the vapour phase. A much greater proportion exists in the form of fine solid particles (the particulates). Samples taken from the bottom ash, the cyclone catch and the filter dust, and analysed for the trace element content, show that more than 99{\%} of most metals studied remain in the bed or are removed with the solid particles elutriated from the bed. It seems that an efficient particulate control system will reduce the trace metal concentrations in the flue gas to very low levels.",
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Partitioning of trace elements in pressurised fluidised-bed combustion. / Mojtahedi, Wahab (Corresponding Author); Nieminen, Matti; Hulkkonen, Seppo; Jahkola, Antero.

In: Fuel Processing Technology, Vol. 26, No. 2, 1990, p. 83-97.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Partitioning of trace elements in pressurised fluidised-bed combustion

AU - Mojtahedi, Wahab

AU - Nieminen, Matti

AU - Hulkkonen, Seppo

AU - Jahkola, Antero

PY - 1990

Y1 - 1990

N2 - The relative distribution of a few selected trace elements in the effluent streams of a 15 cm diameter pressurised fluidised-bed combustor is investigated. The effect of in-bed desulphurisation as well as high-temperature, high-pressure particle removal on trace element emissions is studied and some of the results are reported in this paper.An extractive sampling technique, used to measure the trace element concentrations in the vapour phase, is briefly discussed. This was designed to enable a more accurate assessment of the volatilisation of selected trace elements in the bed. The results show that a relatively small proportion of the fuel-bound trace metals investigated leaves the combustor in the vapour phase. A much greater proportion exists in the form of fine solid particles (the particulates). Samples taken from the bottom ash, the cyclone catch and the filter dust, and analysed for the trace element content, show that more than 99% of most metals studied remain in the bed or are removed with the solid particles elutriated from the bed. It seems that an efficient particulate control system will reduce the trace metal concentrations in the flue gas to very low levels.

AB - The relative distribution of a few selected trace elements in the effluent streams of a 15 cm diameter pressurised fluidised-bed combustor is investigated. The effect of in-bed desulphurisation as well as high-temperature, high-pressure particle removal on trace element emissions is studied and some of the results are reported in this paper.An extractive sampling technique, used to measure the trace element concentrations in the vapour phase, is briefly discussed. This was designed to enable a more accurate assessment of the volatilisation of selected trace elements in the bed. The results show that a relatively small proportion of the fuel-bound trace metals investigated leaves the combustor in the vapour phase. A much greater proportion exists in the form of fine solid particles (the particulates). Samples taken from the bottom ash, the cyclone catch and the filter dust, and analysed for the trace element content, show that more than 99% of most metals studied remain in the bed or are removed with the solid particles elutriated from the bed. It seems that an efficient particulate control system will reduce the trace metal concentrations in the flue gas to very low levels.

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KW - fluidized beds

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