Model for char combustion particle size distribution and inventory in air and oxy-fuel combustion in fluidized beds

Jaakko Saastamoinen (Corresponding Author), Antti Tourunen

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

A shrinking particle model with apparent reaction rate parameters is frequently applied in the modeling of burning of coal particles in boilers. In oxy-fuel combustion, the nitrogen in the gas atmosphere is replaced by carbon dioxide and water vapor, enhancing the burning rate by gasification. A shrinking particle model, including the gasification taking place inside the particles, is presented. Boundary layer combustion of CO reduces the burning rate of char because of consumption of oxygen, allowing for less to reach the particle surface. This is accounted by an effective Sherwood number. Analytical and numerical solutions for combustion of char and char inventory in the bed are extended to include the effect of internal gasification and boundary layer combustion of CO. Measured char inventories in air and oxy-fuel conditions in pilot-scale circulating fluidized-bed combustion are compared to calculated char inventories. The modeling results are also applicable for pulverized fuel combustion.
Original languageEnglish
Pages (from-to)407-416
JournalEnergy & Fuels
Volume26
Issue number1
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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Particle size analysis
Fluidized beds
Air
Gasification
Carbon Monoxide
Boundary layers
Pulverized fuel
Fluidized bed combustion
Coal
Steam
Carbon Dioxide
Water vapor
Reaction rates
Boilers
Carbon dioxide
Nitrogen
Gases
Oxygen

Cite this

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title = "Model for char combustion particle size distribution and inventory in air and oxy-fuel combustion in fluidized beds",
abstract = "A shrinking particle model with apparent reaction rate parameters is frequently applied in the modeling of burning of coal particles in boilers. In oxy-fuel combustion, the nitrogen in the gas atmosphere is replaced by carbon dioxide and water vapor, enhancing the burning rate by gasification. A shrinking particle model, including the gasification taking place inside the particles, is presented. Boundary layer combustion of CO reduces the burning rate of char because of consumption of oxygen, allowing for less to reach the particle surface. This is accounted by an effective Sherwood number. Analytical and numerical solutions for combustion of char and char inventory in the bed are extended to include the effect of internal gasification and boundary layer combustion of CO. Measured char inventories in air and oxy-fuel conditions in pilot-scale circulating fluidized-bed combustion are compared to calculated char inventories. The modeling results are also applicable for pulverized fuel combustion.",
author = "Jaakko Saastamoinen and Antti Tourunen",
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year = "2012",
doi = "10.1021/ef201362h",
language = "English",
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pages = "407--416",
journal = "Energy & Fuels",
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Model for char combustion particle size distribution and inventory in air and oxy-fuel combustion in fluidized beds. / Saastamoinen, Jaakko (Corresponding Author); Tourunen, Antti.

In: Energy & Fuels, Vol. 26, No. 1, 2012, p. 407-416.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Model for char combustion particle size distribution and inventory in air and oxy-fuel combustion in fluidized beds

AU - Saastamoinen, Jaakko

AU - Tourunen, Antti

N1 - Project code: 32762

PY - 2012

Y1 - 2012

N2 - A shrinking particle model with apparent reaction rate parameters is frequently applied in the modeling of burning of coal particles in boilers. In oxy-fuel combustion, the nitrogen in the gas atmosphere is replaced by carbon dioxide and water vapor, enhancing the burning rate by gasification. A shrinking particle model, including the gasification taking place inside the particles, is presented. Boundary layer combustion of CO reduces the burning rate of char because of consumption of oxygen, allowing for less to reach the particle surface. This is accounted by an effective Sherwood number. Analytical and numerical solutions for combustion of char and char inventory in the bed are extended to include the effect of internal gasification and boundary layer combustion of CO. Measured char inventories in air and oxy-fuel conditions in pilot-scale circulating fluidized-bed combustion are compared to calculated char inventories. The modeling results are also applicable for pulverized fuel combustion.

AB - A shrinking particle model with apparent reaction rate parameters is frequently applied in the modeling of burning of coal particles in boilers. In oxy-fuel combustion, the nitrogen in the gas atmosphere is replaced by carbon dioxide and water vapor, enhancing the burning rate by gasification. A shrinking particle model, including the gasification taking place inside the particles, is presented. Boundary layer combustion of CO reduces the burning rate of char because of consumption of oxygen, allowing for less to reach the particle surface. This is accounted by an effective Sherwood number. Analytical and numerical solutions for combustion of char and char inventory in the bed are extended to include the effect of internal gasification and boundary layer combustion of CO. Measured char inventories in air and oxy-fuel conditions in pilot-scale circulating fluidized-bed combustion are compared to calculated char inventories. The modeling results are also applicable for pulverized fuel combustion.

U2 - 10.1021/ef201362h

DO - 10.1021/ef201362h

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SP - 407

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JO - Energy & Fuels

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