Numerical modeling of fine particle and deposit formation in a recovery boiler

A. Leppänen (Corresponding Author), H. Tran, Raili Taipale, E. Välimäki, Antti Oksanen

Research output: Contribution to journalArticleScientificpeer-review

29 Citations (Scopus)

Abstract

In kraft pulp mills, black liquor is concentrated and burned in recovery boilers to produce steam and power and to recover pulping chemicals. Black liquor contains a large amount of alkali compounds, which form ash with low melting temperatures upon combustion. This causes many problems in recovery boiler operation, including fouling of the heat transfer surfaces, plugging of the flue gas passages, reduction of the heat transfer rate, and corrosion of the superheater tubes. This paper presents a model for simulating fine fume particles formed as a result of condensation of alkali compound vapors in the recovery boiler. The modeling method combines CFD modeling, equilibrium chemistry, and fine particle dynamics in a way that enables simulation of a full scale three-dimensional boiler environment. The model has been partially validated with measurements performed in an operating recovery boiler. The modeling results, particularly for the fume particle composition, agree well with the actual measurements.
Original languageEnglish
Pages (from-to)45-53
Number of pages9
JournalFuel
Volume129
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Boilers
Deposits
Recovery
Fumes
Alkalies
Ashes
Superheater tubes
Heat transfer
Kraft pulp
Paper and pulp mills
Steam
Fouling
Flue gases
Melting point
Condensation
Computational fluid dynamics
Vapors
Corrosion
Chemical analysis

Keywords

  • kraft recovery boiler
  • alkali metal,
  • fine particle
  • deposition
  • computational fluid dynamics

Cite this

Leppänen, A. ; Tran, H. ; Taipale, Raili ; Välimäki, E. ; Oksanen, Antti. / Numerical modeling of fine particle and deposit formation in a recovery boiler. In: Fuel. 2014 ; Vol. 129. pp. 45-53.
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title = "Numerical modeling of fine particle and deposit formation in a recovery boiler",
abstract = "In kraft pulp mills, black liquor is concentrated and burned in recovery boilers to produce steam and power and to recover pulping chemicals. Black liquor contains a large amount of alkali compounds, which form ash with low melting temperatures upon combustion. This causes many problems in recovery boiler operation, including fouling of the heat transfer surfaces, plugging of the flue gas passages, reduction of the heat transfer rate, and corrosion of the superheater tubes. This paper presents a model for simulating fine fume particles formed as a result of condensation of alkali compound vapors in the recovery boiler. The modeling method combines CFD modeling, equilibrium chemistry, and fine particle dynamics in a way that enables simulation of a full scale three-dimensional boiler environment. The model has been partially validated with measurements performed in an operating recovery boiler. The modeling results, particularly for the fume particle composition, agree well with the actual measurements.",
keywords = "kraft recovery boiler, alkali metal,, fine particle, deposition, computational fluid dynamics",
author = "A. Lepp{\"a}nen and H. Tran and Raili Taipale and E. V{\"a}lim{\"a}ki and Antti Oksanen",
note = "Project code: 76997",
year = "2014",
doi = "10.1016/j.fuel.2014.03.046",
language = "English",
volume = "129",
pages = "45--53",
journal = "Fuel",
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Numerical modeling of fine particle and deposit formation in a recovery boiler. / Leppänen, A. (Corresponding Author); Tran, H.; Taipale, Raili; Välimäki, E.; Oksanen, Antti.

In: Fuel, Vol. 129, 2014, p. 45-53.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Numerical modeling of fine particle and deposit formation in a recovery boiler

AU - Leppänen, A.

AU - Tran, H.

AU - Taipale, Raili

AU - Välimäki, E.

AU - Oksanen, Antti

N1 - Project code: 76997

PY - 2014

Y1 - 2014

N2 - In kraft pulp mills, black liquor is concentrated and burned in recovery boilers to produce steam and power and to recover pulping chemicals. Black liquor contains a large amount of alkali compounds, which form ash with low melting temperatures upon combustion. This causes many problems in recovery boiler operation, including fouling of the heat transfer surfaces, plugging of the flue gas passages, reduction of the heat transfer rate, and corrosion of the superheater tubes. This paper presents a model for simulating fine fume particles formed as a result of condensation of alkali compound vapors in the recovery boiler. The modeling method combines CFD modeling, equilibrium chemistry, and fine particle dynamics in a way that enables simulation of a full scale three-dimensional boiler environment. The model has been partially validated with measurements performed in an operating recovery boiler. The modeling results, particularly for the fume particle composition, agree well with the actual measurements.

AB - In kraft pulp mills, black liquor is concentrated and burned in recovery boilers to produce steam and power and to recover pulping chemicals. Black liquor contains a large amount of alkali compounds, which form ash with low melting temperatures upon combustion. This causes many problems in recovery boiler operation, including fouling of the heat transfer surfaces, plugging of the flue gas passages, reduction of the heat transfer rate, and corrosion of the superheater tubes. This paper presents a model for simulating fine fume particles formed as a result of condensation of alkali compound vapors in the recovery boiler. The modeling method combines CFD modeling, equilibrium chemistry, and fine particle dynamics in a way that enables simulation of a full scale three-dimensional boiler environment. The model has been partially validated with measurements performed in an operating recovery boiler. The modeling results, particularly for the fume particle composition, agree well with the actual measurements.

KW - kraft recovery boiler

KW - alkali metal,

KW - fine particle

KW - deposition

KW - computational fluid dynamics

U2 - 10.1016/j.fuel.2014.03.046

DO - 10.1016/j.fuel.2014.03.046

M3 - Article

VL - 129

SP - 45

EP - 53

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -