Large-eddy simulation of ash deposition in a large-scale laboratory furnace

被引：37

作者：

Zhou, Min-min ^{[1
]}

Parra-Alvarez, John C. ^{[1
]}

Smith, Philip J. ^{[1
]}

Isaac, Benjamin J. ^{[1
]}

Thornock, Jeremy N. ^{[1
]}

Wang, Yueming ^{[1
]}

Smith, Sean T. ^{[1
]}

机构：

[1] Univ Utah, Dept Chem Engn, Inst Clean & Secure Energy, Salt Lake City, UT 84112 USA

来源：

PROCEEDINGS OF THE COMBUSTION INSTITUTE | 2019年 / 37卷 / 04期

关键词：

Large-eddy simulation; Ash deposition; Coal combustion; Wall heat transfer; Boiler design; OXY-COAL COMBUSTION; REBOUND BEHAVIOR; HEAT-TRANSFER; MODEL; PARTICLES; IMPACT; ADHESION; STICKING; TUBE;

D O I：

10.1016/j.proci.2018.09.034

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A computational fluid dynamics model is presented that allows for the investigation of the ash deposition and provides an economical approach for studying design changes in new boilers and retrofit options for existing units. This study proposes a detailed description of ash deposition integrating three separate particle-sticking criteria: melt fraction, viscosity, and energy conservation upon collision. Also, a detailed model for predicting the thermal properties of existing deposit layers (thermal conductivity and emissivity) is implemented into a one-dimensional wall heat-transfer model. The coupled ash-deposition and wall heat-transfer model is implemented into a large-eddy simulation (LES) framework to predict the heat-flux profile, deposition rates, slagging and fouling for industrial boilers. The results of this approach are validated with experimental data from the University of Utah's 100 kW down-fired, oxy-fuel combustion (OFC) furnace. Two OFC cases with different geometries are studied for their coal combustion and dynamic ash-deposit growth in this large-scale laboratory furnace. Comparisons of the deposition rates and gas temperature agree within 4.82% and 17.58%, respectively, of the measured data. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

引用

页码：4409 / 4418

页数：10

共 45 条

[1] Impact, recoil and splashing of molten metal droplets [J].

Aziz, SD ;

Chandra, S .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2000, 43 (16) :2841-2857

[2] Measurements and CFD modeling of a pulverized coal flame with emphasis on ash deposition [J].

Beckmann, A. M. ;

Mancini, M. ;

Weber, R. ;

Seebold, S. ;

Mueller, M. .

FUEL, 2016, 167 :168-179

[3]

Bohren C., 2008, WILEY SCI SERIES

[4] MULTIPLE-SCATTERING OF LIGHT AND SOME OF ITS OBSERVABLE CONSEQUENCES [J].

BOHREN, CF .

AMERICAN JOURNAL OF PHYSICS, 1987, 55 (06) :524-533

[5]

BOOW J, 1969, J I FUEL, V42, P412

[6] A temperature-history based model for the sticking probability of impacting pulverized coal ash particles [J].

Brink, Anders ;

Lindberg, Daniel ;

Hupa, Mikko ;

de Tejada, Marta Escoto ;

Paneru, Manoj ;

Maier, Joerg ;

Scheffknecht, Guenter ;

Pranzitelli, Alessandro ;

Pourkashanian, Mohamed .

FUEL PROCESSING TECHNOLOGY, 2016, 141 :210-215

[7]

Diaz- Ibarra O. H., 2017, THESIS

[8]

Fox R.O., 2003, Computational Models for Turbulent Reacting Flows, DOI 10.1017/CBO9780511610103

[9] A DYNAMIC SUBGRID-SCALE EDDY VISCOSITY MODEL [J].

GERMANO, M ;

PIOMELLI, U ;

MOIN, P ;

CABOT, WH .

PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1991, 3 (07) :1760-1765

[10] THERMAL-CONDUCTIVITY OF PACKED METAL POWDERS [J].

HADLEY, GR .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1986, 29 (06) :909-920

← 1 2 3 4 5 →