Modeling the slag behavior in three dimensional CFD simulation of a vertically-oriented oxy-coal combustor

Lei Chen, Sze Yong, Ahmed F. Ghoniem

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Slagging and fouling are important phenomena associated with ash handling and discharge in coal combustion and gasification. A slag model has been developed for modeling the ash/slag fate including char/ash deposition, char wall burning, molten slag flow, as well as solid slag layer formation on the reactor wall. The submodels are implemented as user defined functions in a three-dimensional computational fluid dynamics (CFD) code, and applied for the simulation of a pilot scale coal slagging combustion facility. The results on the two-dimensional cylindrical reactor wall show uneven char/ash deposition distribution due to the non-axisymmetric flowfield and char trajectories in the reactor. Molten ash properties such as the temperature of critical viscosity (Tcv) and slag viscosity are critical to the slag layer buildup and solid slag layer formation, and eventually affect the ash partition between slag and fly ash. The proportion of ash captured on the cylindrical wall decreases from 44.1% to 23.5% when Tcv increases from 1580 K to 1780 K. Since the reactor is configured with refractory-brick wall, the slag layer has limited impact on the heat transfer through the wall due to its small thickness.

Original languageEnglish (US)
Pages (from-to)106-117
Number of pages12
JournalFuel Processing Technology
Volume112
DOIs
StatePublished - Apr 8 2013
Externally publishedYes

Fingerprint

Ashes
Coal
Combustors
Slags
Computational fluid dynamics
Computer simulation
Coal combustion
Viscosity
Molten materials
Ash handling
Coal Ash
Coal gasification
Brick
Fouling
Fly ash
Refractory materials
Trajectories
Heat transfer
Temperature

Keywords

  • CFD
  • Coal combustion
  • Gasification
  • Modeling
  • Slag

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Modeling the slag behavior in three dimensional CFD simulation of a vertically-oriented oxy-coal combustor. / Chen, Lei; Yong, Sze; Ghoniem, Ahmed F.

In: Fuel Processing Technology, Vol. 112, 08.04.2013, p. 106-117.

Research output: Contribution to journalArticle

@article{688e5b8f54fa4bca9d02e5a39f5da38f,
title = "Modeling the slag behavior in three dimensional CFD simulation of a vertically-oriented oxy-coal combustor",
abstract = "Slagging and fouling are important phenomena associated with ash handling and discharge in coal combustion and gasification. A slag model has been developed for modeling the ash/slag fate including char/ash deposition, char wall burning, molten slag flow, as well as solid slag layer formation on the reactor wall. The submodels are implemented as user defined functions in a three-dimensional computational fluid dynamics (CFD) code, and applied for the simulation of a pilot scale coal slagging combustion facility. The results on the two-dimensional cylindrical reactor wall show uneven char/ash deposition distribution due to the non-axisymmetric flowfield and char trajectories in the reactor. Molten ash properties such as the temperature of critical viscosity (Tcv) and slag viscosity are critical to the slag layer buildup and solid slag layer formation, and eventually affect the ash partition between slag and fly ash. The proportion of ash captured on the cylindrical wall decreases from 44.1{\%} to 23.5{\%} when Tcv increases from 1580 K to 1780 K. Since the reactor is configured with refractory-brick wall, the slag layer has limited impact on the heat transfer through the wall due to its small thickness.",
keywords = "CFD, Coal combustion, Gasification, Modeling, Slag",
author = "Lei Chen and Sze Yong and Ghoniem, {Ahmed F.}",
year = "2013",
month = "4",
day = "8",
doi = "10.1016/j.fuproc.2013.02.010",
language = "English (US)",
volume = "112",
pages = "106--117",
journal = "Fuel Processing Technology",
issn = "0378-3820",
publisher = "Elsevier",

}

TY - JOUR

T1 - Modeling the slag behavior in three dimensional CFD simulation of a vertically-oriented oxy-coal combustor

AU - Chen, Lei

AU - Yong, Sze

AU - Ghoniem, Ahmed F.

PY - 2013/4/8

Y1 - 2013/4/8

N2 - Slagging and fouling are important phenomena associated with ash handling and discharge in coal combustion and gasification. A slag model has been developed for modeling the ash/slag fate including char/ash deposition, char wall burning, molten slag flow, as well as solid slag layer formation on the reactor wall. The submodels are implemented as user defined functions in a three-dimensional computational fluid dynamics (CFD) code, and applied for the simulation of a pilot scale coal slagging combustion facility. The results on the two-dimensional cylindrical reactor wall show uneven char/ash deposition distribution due to the non-axisymmetric flowfield and char trajectories in the reactor. Molten ash properties such as the temperature of critical viscosity (Tcv) and slag viscosity are critical to the slag layer buildup and solid slag layer formation, and eventually affect the ash partition between slag and fly ash. The proportion of ash captured on the cylindrical wall decreases from 44.1% to 23.5% when Tcv increases from 1580 K to 1780 K. Since the reactor is configured with refractory-brick wall, the slag layer has limited impact on the heat transfer through the wall due to its small thickness.

AB - Slagging and fouling are important phenomena associated with ash handling and discharge in coal combustion and gasification. A slag model has been developed for modeling the ash/slag fate including char/ash deposition, char wall burning, molten slag flow, as well as solid slag layer formation on the reactor wall. The submodels are implemented as user defined functions in a three-dimensional computational fluid dynamics (CFD) code, and applied for the simulation of a pilot scale coal slagging combustion facility. The results on the two-dimensional cylindrical reactor wall show uneven char/ash deposition distribution due to the non-axisymmetric flowfield and char trajectories in the reactor. Molten ash properties such as the temperature of critical viscosity (Tcv) and slag viscosity are critical to the slag layer buildup and solid slag layer formation, and eventually affect the ash partition between slag and fly ash. The proportion of ash captured on the cylindrical wall decreases from 44.1% to 23.5% when Tcv increases from 1580 K to 1780 K. Since the reactor is configured with refractory-brick wall, the slag layer has limited impact on the heat transfer through the wall due to its small thickness.

KW - CFD

KW - Coal combustion

KW - Gasification

KW - Modeling

KW - Slag

UR - http://www.scopus.com/inward/record.url?scp=84875740430&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84875740430&partnerID=8YFLogxK

U2 - 10.1016/j.fuproc.2013.02.010

DO - 10.1016/j.fuproc.2013.02.010

M3 - Article

AN - SCOPUS:84875740430

VL - 112

SP - 106

EP - 117

JO - Fuel Processing Technology

JF - Fuel Processing Technology

SN - 0378-3820

ER -