Submicron fly ash penetration through electrostatic precipitators at two coal power plants

Martin Mohr, Sampo Ylätalo, Norbert Klippel, Esko Kauppinen

Research output: Contribution to journalArticleScientificpeer-review

61 Citations (Scopus)

Abstract

Simultaneous measurements of the size distribution were performed for fine particulate matter (diameter d < 0.5 μm) at the inlet and outlet of the electrostatic precipitators (ESP) of two full-scale pulverized coal power stations (615 MW, 510 MW). For a comparative study of the performance of the ESP the same high resistivity coal was burned at both sites. In addition, measurements were carried out for an easy to handle coal at the newer state-of-the-art power station. Effects on the size distribution caused by nonintermittent pulse energization of the ESP were also investigated. The results revealed a significantly stronger influence of the boiler than of the coal type on the size distribution at the inlet of the ESPs. In all cases the distribution was unimodal and a pronounced peak could be observed around 100 nm particle diameter. The ESP outlet distributions varied much more and showed also a dependence on the coal type. The maximum of the penetration through the ESP was determined in the range from 300 to 400 nm for all configurations. At the newer power station the number of ultrafine particles (< 30 nm) at the ESP outlet exceeded the inlet concentration under certain conditions. This effect was strongly influenced by the ESP energization and seemed to be related to the denitrification unit (DeNOx) installed upstream of the ESP where ammonia is injected as reducing agent. We conclude that ultrafine particles are formed inside the ESP and suggest that the ammonia injection has a decisive influence on their formation.
Original languageEnglish
Pages (from-to)191-204
Number of pages14
JournalAerosol Science and Technology
Volume24
Issue number3
DOIs
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

Fingerprint

Coal Ash
Electrostatic precipitators
Coal
Fly ash
fly ash
power plant
Power plants
penetration
coal
ammonia
Ammonia
denitrification
particulate matter
electrical resistivity
comparative study
Particulate Matter
Denitrification
Reducing Agents
Reducing agents
Boilers

Cite this

Mohr, Martin ; Ylätalo, Sampo ; Klippel, Norbert ; Kauppinen, Esko. / Submicron fly ash penetration through electrostatic precipitators at two coal power plants. In: Aerosol Science and Technology. 1996 ; Vol. 24, No. 3. pp. 191-204.
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abstract = "Simultaneous measurements of the size distribution were performed for fine particulate matter (diameter d < 0.5 μm) at the inlet and outlet of the electrostatic precipitators (ESP) of two full-scale pulverized coal power stations (615 MW, 510 MW). For a comparative study of the performance of the ESP the same high resistivity coal was burned at both sites. In addition, measurements were carried out for an easy to handle coal at the newer state-of-the-art power station. Effects on the size distribution caused by nonintermittent pulse energization of the ESP were also investigated. The results revealed a significantly stronger influence of the boiler than of the coal type on the size distribution at the inlet of the ESPs. In all cases the distribution was unimodal and a pronounced peak could be observed around 100 nm particle diameter. The ESP outlet distributions varied much more and showed also a dependence on the coal type. The maximum of the penetration through the ESP was determined in the range from 300 to 400 nm for all configurations. At the newer power station the number of ultrafine particles (< 30 nm) at the ESP outlet exceeded the inlet concentration under certain conditions. This effect was strongly influenced by the ESP energization and seemed to be related to the denitrification unit (DeNOx) installed upstream of the ESP where ammonia is injected as reducing agent. We conclude that ultrafine particles are formed inside the ESP and suggest that the ammonia injection has a decisive influence on their formation.",
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Submicron fly ash penetration through electrostatic precipitators at two coal power plants. / Mohr, Martin; Ylätalo, Sampo; Klippel, Norbert; Kauppinen, Esko.

In: Aerosol Science and Technology, Vol. 24, No. 3, 1996, p. 191-204.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Mohr, Martin

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N2 - Simultaneous measurements of the size distribution were performed for fine particulate matter (diameter d < 0.5 μm) at the inlet and outlet of the electrostatic precipitators (ESP) of two full-scale pulverized coal power stations (615 MW, 510 MW). For a comparative study of the performance of the ESP the same high resistivity coal was burned at both sites. In addition, measurements were carried out for an easy to handle coal at the newer state-of-the-art power station. Effects on the size distribution caused by nonintermittent pulse energization of the ESP were also investigated. The results revealed a significantly stronger influence of the boiler than of the coal type on the size distribution at the inlet of the ESPs. In all cases the distribution was unimodal and a pronounced peak could be observed around 100 nm particle diameter. The ESP outlet distributions varied much more and showed also a dependence on the coal type. The maximum of the penetration through the ESP was determined in the range from 300 to 400 nm for all configurations. At the newer power station the number of ultrafine particles (< 30 nm) at the ESP outlet exceeded the inlet concentration under certain conditions. This effect was strongly influenced by the ESP energization and seemed to be related to the denitrification unit (DeNOx) installed upstream of the ESP where ammonia is injected as reducing agent. We conclude that ultrafine particles are formed inside the ESP and suggest that the ammonia injection has a decisive influence on their formation.

AB - Simultaneous measurements of the size distribution were performed for fine particulate matter (diameter d < 0.5 μm) at the inlet and outlet of the electrostatic precipitators (ESP) of two full-scale pulverized coal power stations (615 MW, 510 MW). For a comparative study of the performance of the ESP the same high resistivity coal was burned at both sites. In addition, measurements were carried out for an easy to handle coal at the newer state-of-the-art power station. Effects on the size distribution caused by nonintermittent pulse energization of the ESP were also investigated. The results revealed a significantly stronger influence of the boiler than of the coal type on the size distribution at the inlet of the ESPs. In all cases the distribution was unimodal and a pronounced peak could be observed around 100 nm particle diameter. The ESP outlet distributions varied much more and showed also a dependence on the coal type. The maximum of the penetration through the ESP was determined in the range from 300 to 400 nm for all configurations. At the newer power station the number of ultrafine particles (< 30 nm) at the ESP outlet exceeded the inlet concentration under certain conditions. This effect was strongly influenced by the ESP energization and seemed to be related to the denitrification unit (DeNOx) installed upstream of the ESP where ammonia is injected as reducing agent. We conclude that ultrafine particles are formed inside the ESP and suggest that the ammonia injection has a decisive influence on their formation.

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