Physical and chemical characteristics of flue-gas particles in a large pulverized fuel-fired power plant boiler during co-combustion of coal and wood pellets

Fanni Mylläri, Panu Karjalainen, Raili Taipale, Pami Aalto, Anna Häyrinen, Jani Rautiainen, Liisa Pirjola, Risto Hillamo, Jorma Keskinen, Topi Rönkkö (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Fossil fuel combustion should be decreased in future years in order to lower the CO2 emissions of energy production. The reduction can be achieved by increasing the amount of CO2-neutral fuels in energy production. Here 6-13% of coal was substituted with industrial or roasted pellets in a pulverized fuel-fired power plant without making any changes to fuel grinding or low-NOx burners. The effect of pellet addition for the flue gas particles was studied with direct sampling from the boiler super heater area. Based on primary dilution ratio tests, transmission electron microscope images, and the natural electric charge of the particles, it was observed that particles in the flue gas are spherical and have been formed in the boiler at high temperatures. The pellet addition lowered the total particle number concentrations with all of the studied pellet-coal mixtures in comparison to the coal combustion. The 10.5% industrial pellet addition caused a second mode in the particle number size distribution. In addition, based on the chemical analysis of the collected size-fractioned particle samples, results indicated that the pellet addition did not increase the corrosion risk of the boiler. However, the changes in the particle number size distribution and total particle number concentration can affect the operation of electrostatic precipitators and flue gas cleaning.
Original languageEnglish
Pages (from-to)554-566
Number of pages13
JournalCombustion and Flame
Volume176
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Pulverized fuel
flue gases
Coal
boilers
power plants
Flue gases
pellets
coal
Boilers
Wood
Power plants
Electrostatic precipitators
Electric charge
Coal combustion
Fuel burners
Fossil fuels
Dilution
Cleaning
Electron microscopes
Particle size

Keywords

  • biomass combustion
  • high temperature aerosol
  • total particle number concentration
  • particle number size distribution
  • pulverized fuel
  • coal

Cite this

Mylläri, Fanni ; Karjalainen, Panu ; Taipale, Raili ; Aalto, Pami ; Häyrinen, Anna ; Rautiainen, Jani ; Pirjola, Liisa ; Hillamo, Risto ; Keskinen, Jorma ; Rönkkö, Topi. / Physical and chemical characteristics of flue-gas particles in a large pulverized fuel-fired power plant boiler during co-combustion of coal and wood pellets. In: Combustion and Flame. 2017 ; Vol. 176. pp. 554-566.
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title = "Physical and chemical characteristics of flue-gas particles in a large pulverized fuel-fired power plant boiler during co-combustion of coal and wood pellets",
abstract = "Fossil fuel combustion should be decreased in future years in order to lower the CO2 emissions of energy production. The reduction can be achieved by increasing the amount of CO2-neutral fuels in energy production. Here 6-13{\%} of coal was substituted with industrial or roasted pellets in a pulverized fuel-fired power plant without making any changes to fuel grinding or low-NOx burners. The effect of pellet addition for the flue gas particles was studied with direct sampling from the boiler super heater area. Based on primary dilution ratio tests, transmission electron microscope images, and the natural electric charge of the particles, it was observed that particles in the flue gas are spherical and have been formed in the boiler at high temperatures. The pellet addition lowered the total particle number concentrations with all of the studied pellet-coal mixtures in comparison to the coal combustion. The 10.5{\%} industrial pellet addition caused a second mode in the particle number size distribution. In addition, based on the chemical analysis of the collected size-fractioned particle samples, results indicated that the pellet addition did not increase the corrosion risk of the boiler. However, the changes in the particle number size distribution and total particle number concentration can affect the operation of electrostatic precipitators and flue gas cleaning.",
keywords = "biomass combustion, high temperature aerosol, total particle number concentration, particle number size distribution, pulverized fuel, coal",
author = "Fanni Myll{\"a}ri and Panu Karjalainen and Raili Taipale and Pami Aalto and Anna H{\"a}yrinen and Jani Rautiainen and Liisa Pirjola and Risto Hillamo and Jorma Keskinen and Topi R{\"o}nkk{\"o}",
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Mylläri, F, Karjalainen, P, Taipale, R, Aalto, P, Häyrinen, A, Rautiainen, J, Pirjola, L, Hillamo, R, Keskinen, J & Rönkkö, T 2017, 'Physical and chemical characteristics of flue-gas particles in a large pulverized fuel-fired power plant boiler during co-combustion of coal and wood pellets', Combustion and Flame, vol. 176, pp. 554-566. https://doi.org/10.1016/j.combustflame.2016.10.027

Physical and chemical characteristics of flue-gas particles in a large pulverized fuel-fired power plant boiler during co-combustion of coal and wood pellets. / Mylläri, Fanni; Karjalainen, Panu; Taipale, Raili; Aalto, Pami; Häyrinen, Anna; Rautiainen, Jani; Pirjola, Liisa; Hillamo, Risto; Keskinen, Jorma; Rönkkö, Topi (Corresponding Author).

In: Combustion and Flame, Vol. 176, 2017, p. 554-566.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Physical and chemical characteristics of flue-gas particles in a large pulverized fuel-fired power plant boiler during co-combustion of coal and wood pellets

AU - Mylläri, Fanni

AU - Karjalainen, Panu

AU - Taipale, Raili

AU - Aalto, Pami

AU - Häyrinen, Anna

AU - Rautiainen, Jani

AU - Pirjola, Liisa

AU - Hillamo, Risto

AU - Keskinen, Jorma

AU - Rönkkö, Topi

PY - 2017

Y1 - 2017

N2 - Fossil fuel combustion should be decreased in future years in order to lower the CO2 emissions of energy production. The reduction can be achieved by increasing the amount of CO2-neutral fuels in energy production. Here 6-13% of coal was substituted with industrial or roasted pellets in a pulverized fuel-fired power plant without making any changes to fuel grinding or low-NOx burners. The effect of pellet addition for the flue gas particles was studied with direct sampling from the boiler super heater area. Based on primary dilution ratio tests, transmission electron microscope images, and the natural electric charge of the particles, it was observed that particles in the flue gas are spherical and have been formed in the boiler at high temperatures. The pellet addition lowered the total particle number concentrations with all of the studied pellet-coal mixtures in comparison to the coal combustion. The 10.5% industrial pellet addition caused a second mode in the particle number size distribution. In addition, based on the chemical analysis of the collected size-fractioned particle samples, results indicated that the pellet addition did not increase the corrosion risk of the boiler. However, the changes in the particle number size distribution and total particle number concentration can affect the operation of electrostatic precipitators and flue gas cleaning.

AB - Fossil fuel combustion should be decreased in future years in order to lower the CO2 emissions of energy production. The reduction can be achieved by increasing the amount of CO2-neutral fuels in energy production. Here 6-13% of coal was substituted with industrial or roasted pellets in a pulverized fuel-fired power plant without making any changes to fuel grinding or low-NOx burners. The effect of pellet addition for the flue gas particles was studied with direct sampling from the boiler super heater area. Based on primary dilution ratio tests, transmission electron microscope images, and the natural electric charge of the particles, it was observed that particles in the flue gas are spherical and have been formed in the boiler at high temperatures. The pellet addition lowered the total particle number concentrations with all of the studied pellet-coal mixtures in comparison to the coal combustion. The 10.5% industrial pellet addition caused a second mode in the particle number size distribution. In addition, based on the chemical analysis of the collected size-fractioned particle samples, results indicated that the pellet addition did not increase the corrosion risk of the boiler. However, the changes in the particle number size distribution and total particle number concentration can affect the operation of electrostatic precipitators and flue gas cleaning.

KW - biomass combustion

KW - high temperature aerosol

KW - total particle number concentration

KW - particle number size distribution

KW - pulverized fuel

KW - coal

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U2 - 10.1016/j.combustflame.2016.10.027

DO - 10.1016/j.combustflame.2016.10.027

M3 - Article

VL - 176

SP - 554

EP - 566

JO - Combustion and Flame

JF - Combustion and Flame

SN - 0010-2180

ER -