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Research Papers

Study of the Heat Transfer of a Large-Scale Tunnel Furnace Based on Numerical Modeling

[+] Author and Article Information
Umran Ercetin, Nimeti Doner

Engineering Faculty,
Mechanical Engineering Department,
Dumlupinar University,
Kutahya 43270, Turkey

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 21, 2017; final manuscript received October 5, 2017; published online January 23, 2018. Assoc. Editor: Matthew Oehlschlaeger.

J. Thermal Sci. Eng. Appl 10(3), 031002 (Jan 23, 2018) (9 pages) Paper No: TSEA-17-1172; doi: 10.1115/1.4038560 History: Received May 21, 2017; Revised October 05, 2017

The aim of this work is to perform a thermal analysis of the operational conditions of a large-scale roller conveyor furnace in a ceramic factory. The entire furnace was divided into three subzones according to the combustion conditions, and the temperature and gas (CO2, H2O vapor, and O2) distributions of each subzone were evaluated. The computational fluid dynamics (CFD) approach was employed to simulate the flow, temperature profile, and heat transfer. The realizable k–ε model was applied for turbulence simulation of the fluid flow coming from the burners. The discrete ordinates method (DOM) and weighted sum of gray gases (WSGG) model were used for simulation of the radiative heat transfer of the furnace. The high accuracy of the simulation methods was validated with the temperature data of the furnace measured by an infrared thermal camera. From the comparisons between the furnace's operating conditions and the numerical simulations, it was concluded that the simulation methods yielded successful results, and relative deviations of up to 22% were observed in the side wall.

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Figures

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Fig. 1

Schematic picture of the tunnel furnace

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Fig. 2

Heating parts of the tunnel furnace

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Fig. 3

Temperatures of the burners at the beginning, middle, and end parts of the preheating zone

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Fig. 4

Temperatures of the burners at the beginning, middle, and end parts of the heating zone

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Fig. 5

Images of the heating zone of the furnace

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Fig. 6

Temperature values of the tunnel furnace

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Fig. 7

Comparisons of heat transfer results of the furnace for the (a) side, (b) top, and (c) bottom walls

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Fig. 8

Contours of CO2 at z = 8, 20, 25, and 35 m in the furnace

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Fig. 9

Contours of H2O vapor at z = 8, 20, 25, and 35 m in the furnace

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Fig. 10

Contours of O2 at z = 8, 20, 25, and 35 m in the furnace

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Fig. 11

Contours of gas density at z = 8, 20, 25, and 35 m in the furnace

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Fig. 12

Contours of temperature at z = 8, 20, 25, and 35 m in the furnace

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