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Thermal test and numerical simulation of cooling stave with internal ribbed tube

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Abstract

A new type of cooling stave with internal ribbed tube was proposed, and the heat transfer performance of the stave was studied by means of thermal test and numerical simulation. The temperature of cooling stave was monitored in the conditions of furnace gas temperature of 200–700 °C and cooling water velocity of 0.2–1.0 m/s. The thermal test results show that the internal rib structure can form swirl in the water pipe and improve the cooling capacity of the cooling stave. The higher the furnace temperature or the lower the cooling water flow rate, the more obvious the advantage of the cooling stave with internal ribbed tube. The mathematical model of the cooling stave with internal ribbed tube was established by FLUENT software, and the influence of the internal rib structure parameters on the heat transfer performance of the cooling stave was discussed. It is suggested that the parameters of the internal ribbed tube should be 4 ribs, 1 mm in height, 5–7 mm in width, and 20–30 mm in lead. In the same common working conditions of the cooling stave, the maximum temperature of the newly designed cooling stave with internal ribbed tube is reduced by 5.6% compared with that of common cooling stave with round tube. The water flow rate in the internal ribbed tube only needs 0.9 m/s to reach the cooling effect of 2 m/s in the common tube cooling stave, which can save 55% of water. In case of water shortage accident of cooling stave, the maximum temperature of the cooling stave with internal ribbed tube is decreased by 22.4% compared with that of common round tube, which can effectively reduce the harm of water shortage and protect the cooling stave.

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Abbreviations

a :

Thermal diffusivity of fluid (m2/s)

d :

Inner diameter of water pipe (mm)

D :

Outer diameter of water pipe (mm)

h :

Height of rib (mm)

h g :

Composite heat transfer coefficient between gas and hot surface of cooling stave [W/(m2 °C)]

h k :

Natural heat transfer coefficient between cold surface and ambient air [W/(m2 °C)]

h w :

Heat transfer coefficient between hot surface and furnace gas [W/(m2 °C)]

k :

Turbulent fluctuating kinetic energy (J)

l :

Lead of rib (mm)

p :

Pressure of fluid (Pa)

∆p :

Pressure difference between inlet and outlet of water pipe (Pa)

\(\dot{q}_{1}\) :

Heat flux on hot surface (W/m2)

\(\dot{q}_{2}\) :

Heat flux on cold surface (W/m2)

t :

Time (s)

T :

Temperature (°C)

T 1 :

Temperature of hot surface (°C)

T 2 :

Temperature of cold surface (°C)

T a :

Atmospheric temperature (°C)

T g :

Temperature of furnace gas (°C)

T max :

Maximum temperature of cooling stave (°C)

T hmin :

Minimum temperature of hot surface (°C)

T cmax :

Maximum temperature of cold surface (°C)

T cmin :

Minimum temperature of cold surface (°C)

T wo :

Temperature of cooling water outlet (°C)

u :

Velocity of fluids (m/s)

v :

Velocity of cooling water (m/s)

w :

Width of rib (mm)

ε :

Dissipation rate (%)

λ :

Thermal conductivity [W/(m °C)]

ρ :

Density (kg/m3)

υ :

Kinematic viscosity (m/s)

x, y, z :

Direction along thickness, width, and height of cooling stave

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Acknowledgements

This research subject is funded by the National Natural Science Foundation of China (51574179) and Nantong Science and Technology Project (JC2019154).

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Authors and Affiliations

  1. Xinglin College, Nantong University, Nantong, 226000, Jiangsu, China

    Xun Xu

  2. School of Mechanical Engineering, Tongji University, Shanghai, 201804, China

    Li-jun Wu & Zhao-kuo Yuan

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  1. Xun Xu
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  2. Li-jun Wu
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  3. Zhao-kuo Yuan
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Correspondence to Xun Xu.

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Xu, X., Wu, Lj. & Yuan, Zk. Thermal test and numerical simulation of cooling stave with internal ribbed tube. J. Iron Steel Res. Int. 29, 1194–1204 (2022). https://doi.org/10.1007/s42243-022-00765-9

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  • DOI: https://doi.org/10.1007/s42243-022-00765-9

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