Physical and combustion characteristics of biomass particles prepared by different milling processes for suspension firing in utility boilers

Chungen Yin, Maryam Momenikouchaksaraei, Søren Knudsen Kær

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

The physical and combustion properties of roller-milled and hammer-milled wood pellets for suspension-firing are characterized both experimentally and numerically. The particle size and shape distribution is measured based on dynamical digital image processing. The traditional coal roller mills produce larger biomass particles than hammer mills do. The true density of the particles, measured by ethanol displacement method, does not remarkably vary with the different mills. Combustion tests of the milled biomass particles are performed in a single particle combustion reactor under conditions close to suspension-fired boilers. The ignition, devolatilization and burnout times of the milled particles under different combustion conditions are analysed. A one-dimensional transient model, properly accounting for the particle-ambient flow interaction and appropriately addressing the key sub-processes within the particle, is also developed to predict the combustion behaviours. The good agreement between the model predictions and the experimental results serves as a cross validation of both the tests and the model. Without changes in the infrastructure, biomass pelletizing may not be a viable pre-treatment for large-scale biomass combustion in the existing pulverized coal-fired utility boilers.
Original languageEnglish
Title of host publicationProceedings of 9th International Conference on Multiphase Flow, May 22-27, 2016, Firenze, Italy
Number of pages5
PublisherInternational Conference on Multiphase Flow
Publication dateMay 2016
Publication statusPublished - May 2016
EventThe 9th International Conference on Multiphase Flow - Firenze, Italy
Duration: 22 May 201627 May 2016
http://www.aidic.it/icmf2016/

Conference

ConferenceThe 9th International Conference on Multiphase Flow
CountryItaly
CityFirenze
Period22/05/201627/05/2016
Internet address

Fingerprint

boilers
biomass
hammers
rollers
coal
burnout
particle size distribution
pellets
pretreatment
ignition
image processing
ethyl alcohol
physical properties
reactors
predictions

Keywords

  • Biomass pellet
  • Suspension combustion
  • Roller mill
  • Hammer mill
  • Pulverized fuel boiler

Cite this

Yin, C., Momenikouchaksaraei, M., & Kær, S. K. (2016). Physical and combustion characteristics of biomass particles prepared by different milling processes for suspension firing in utility boilers. In Proceedings of 9th International Conference on Multiphase Flow, May 22-27, 2016, Firenze, Italy International Conference on Multiphase Flow.
Yin, Chungen ; Momenikouchaksaraei, Maryam ; Kær, Søren Knudsen. / Physical and combustion characteristics of biomass particles prepared by different milling processes for suspension firing in utility boilers. Proceedings of 9th International Conference on Multiphase Flow, May 22-27, 2016, Firenze, Italy. International Conference on Multiphase Flow, 2016.
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abstract = "The physical and combustion properties of roller-milled and hammer-milled wood pellets for suspension-firing are characterized both experimentally and numerically. The particle size and shape distribution is measured based on dynamical digital image processing. The traditional coal roller mills produce larger biomass particles than hammer mills do. The true density of the particles, measured by ethanol displacement method, does not remarkably vary with the different mills. Combustion tests of the milled biomass particles are performed in a single particle combustion reactor under conditions close to suspension-fired boilers. The ignition, devolatilization and burnout times of the milled particles under different combustion conditions are analysed. A one-dimensional transient model, properly accounting for the particle-ambient flow interaction and appropriately addressing the key sub-processes within the particle, is also developed to predict the combustion behaviours. The good agreement between the model predictions and the experimental results serves as a cross validation of both the tests and the model. Without changes in the infrastructure, biomass pelletizing may not be a viable pre-treatment for large-scale biomass combustion in the existing pulverized coal-fired utility boilers.",
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Yin, C, Momenikouchaksaraei, M & Kær, SK 2016, Physical and combustion characteristics of biomass particles prepared by different milling processes for suspension firing in utility boilers. in Proceedings of 9th International Conference on Multiphase Flow, May 22-27, 2016, Firenze, Italy. International Conference on Multiphase Flow, The 9th International Conference on Multiphase Flow, Firenze, Italy, 22/05/2016.

Physical and combustion characteristics of biomass particles prepared by different milling processes for suspension firing in utility boilers. / Yin, Chungen; Momenikouchaksaraei, Maryam; Kær, Søren Knudsen.

Proceedings of 9th International Conference on Multiphase Flow, May 22-27, 2016, Firenze, Italy. International Conference on Multiphase Flow, 2016.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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N2 - The physical and combustion properties of roller-milled and hammer-milled wood pellets for suspension-firing are characterized both experimentally and numerically. The particle size and shape distribution is measured based on dynamical digital image processing. The traditional coal roller mills produce larger biomass particles than hammer mills do. The true density of the particles, measured by ethanol displacement method, does not remarkably vary with the different mills. Combustion tests of the milled biomass particles are performed in a single particle combustion reactor under conditions close to suspension-fired boilers. The ignition, devolatilization and burnout times of the milled particles under different combustion conditions are analysed. A one-dimensional transient model, properly accounting for the particle-ambient flow interaction and appropriately addressing the key sub-processes within the particle, is also developed to predict the combustion behaviours. The good agreement between the model predictions and the experimental results serves as a cross validation of both the tests and the model. Without changes in the infrastructure, biomass pelletizing may not be a viable pre-treatment for large-scale biomass combustion in the existing pulverized coal-fired utility boilers.

AB - The physical and combustion properties of roller-milled and hammer-milled wood pellets for suspension-firing are characterized both experimentally and numerically. The particle size and shape distribution is measured based on dynamical digital image processing. The traditional coal roller mills produce larger biomass particles than hammer mills do. The true density of the particles, measured by ethanol displacement method, does not remarkably vary with the different mills. Combustion tests of the milled biomass particles are performed in a single particle combustion reactor under conditions close to suspension-fired boilers. The ignition, devolatilization and burnout times of the milled particles under different combustion conditions are analysed. A one-dimensional transient model, properly accounting for the particle-ambient flow interaction and appropriately addressing the key sub-processes within the particle, is also developed to predict the combustion behaviours. The good agreement between the model predictions and the experimental results serves as a cross validation of both the tests and the model. Without changes in the infrastructure, biomass pelletizing may not be a viable pre-treatment for large-scale biomass combustion in the existing pulverized coal-fired utility boilers.

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KW - Suspension combustion

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KW - Hammer mill

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Yin C, Momenikouchaksaraei M, Kær SK. Physical and combustion characteristics of biomass particles prepared by different milling processes for suspension firing in utility boilers. In Proceedings of 9th International Conference on Multiphase Flow, May 22-27, 2016, Firenze, Italy. International Conference on Multiphase Flow. 2016