Research Papers

Numerical Simulation and Optimization of the Thermodynamic Process of the Molten Salt Furnace

[+] Author and Article Information
Lian Ning

School of Energy and Power Engineering,
Central South University,
Hunan 410083, China
e-mail: ninglian@csu.edu.cn

Dong Fu

Center for Innovation through
Visualization and Simulation (CIVS),
Purdue University Calumet,
Hammond, IN 46323
e-mail: fudong1985@gmail.com

Chenn Q. Zhou

Center for Innovation Through
Visualization and Simulation (CIVS),
Purdue University Calumet,
Hammond, IN 46323
School of Energy and Power Engineering,
Central South University,
Hunan 410083, China
e-mail: czhou@purduecal.edu

Jiemin Zhou

School of Energy and Power Engineering,
Central South University,
Hunan 410083, China
e-mail: jmzhou@csu.edu.cn

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received June 24, 2014; final manuscript received September 29, 2014; published online November 18, 2014. Assoc. Editor: Ranganathan Kumar.

J. Thermal Sci. Eng. Appl 7(1), 011009 (Mar 01, 2015) (5 pages) Paper No: TSEA-14-1152; doi: 10.1115/1.4028907 History: Received June 24, 2014; Revised September 29, 2014; Online November 18, 2014

In this paper, a numerical model of the molten salt furnace process was developed, by using computational fluid dynamics (CFD) technique and considering the gas flow, the combustion and the radiation heat transfer. The results demonstrate that the performances of the salt furnace could be improved by optimization using the numerical model. The temperatures along the circumference of the furnace coil and outside shell are quite even, and the deviant combustion phenomenon is not observed. A back-flow formed in the upper part of the furnace chamber enhances the circulation and the mixing of the gas and effectively stabilizes the combustion in the furnace. The behaviors of CO, CO2, NOx, and H2O are presented in terms of the gas flow, temperature distribution and volumetric concentration distribution. It is concluded that the furnace with the constant air flow rate of 15,500 Nm3/h and the guiding vane angle at 48–50 deg is optimized for the combustion effectiveness.

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Fig. 1

Geometry of molten salt furnace: (a) dimensions and (b) 3D schematic of the location for data plot

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Fig. 3

Schematic of the burner

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Fig. 10

Temperature distribution of Y-axis at Z = 5500 mm

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Fig. 9

Temperature distribution of the furnace outside shell at Z = 5500 mm

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Fig. 8

Effect of oxidizer flow rate on flue temperature

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Fig. 7

Z-axis temperature distribution of several conditions at x = 0 and y = 0

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Fig. 6

Temperature distribution: (a) along Z-axis at X = 0, Y = 0 and (b) along Y-axis at Z = 3000, 5500, and 8000 mm

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Fig. 5

Contours at the X = 0 cross section: (a) gas temperature and (b) gas velocity

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Fig. 4

Gas flow characteristics: (a) streamline and (b) velocity vector distribution Z = 3000, 5500, and 8000 mm cross section




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