INVESTIGATION OF COOLING EFFICIENCY OF THE ROTATING HIGH TEMPERATURE FURNACE FAN
https://doi.org/10.17073/0368-0797-2015-9-662-666
Abstract
The experimental dependence of convective heat transfer from the open surface of the high-temperature furnace fan shaft to an environment at a different frequency of its rotation was obtained. It is shown that under comparable conditions the average heat transfer coefficient of the rotating shaft surface is 40 – 60 % higher than for single fixed cylinder being blown with air fl ow in the transverse direction. The method of rotating shaft cooling calculating is proposed and the mathematical formula that is suitable for estimating the bearings area temperature depending on fan design parameters and furnace operations is obtained. Calculations have shown that the shaft rotation speed increasing rapidly decreases bearings heating temperature in the range of 100 to 600 rpm. In case of further increase of the shaft speed the bearing temperature is almost stabilized. From the analysis of proposed estimated dependence that reduces the bearings heating at the selected speed and diameter of the shaft it is necessary to increase the shaft open surface length or to use materials with the least possible thermal conductivity. The presented dependencies can be used to develop high-temperature fans for heating and heat treatment furnaces.
About the Authors
L. A. Zainullin
OJSC “Scientific Research Institute of Metallurgical Heat Engineering” (“VNIIMT”)
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor, General Director,
16, Studencheskaya str., Ekaterinburg, 620137
M. V. Kalganov
OJSC “Scientific Research Institute of Metallurgical Heat Engineering” (“VNIIMT”)
Russian Federation
Russian Federation
Research Associate,
16, Studencheskaya str., Ekaterinburg, 620137
D. V. Kalganov
OJSC “Scientific Research Institute of Metallurgical Heat Engineering” (“VNIIMT”)
Russian Federation
Russian Federation
Research Associate,
16, Studencheskaya str., Ekaterinburg, 620137
V. F. Yarchuk
Ural Federal University named after the first President of Russia B.N. Yeltsin
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair “Thermal Physics and Informatics in Metallurgy”,
19, Mira str., Ekaterinburg, 620002
References
1. Druzhinin G.M., Ashikhmin A.A., Maslov P.V., Popov A.B., Loshkarev N.B., Galkin S.A. Furnace with a hybrid heating system. Steel in Translation. 2015, vol. 45, no. 3, pp. 216–220.
2. Zainullin L.A., Kalganov M.V., Kalganov D.V., Loshkarev N.B., Fatkhutdinov A.R., Pugin A.I. Furnace electric heaters with radiantconvective heat transfer. Steel in Translation. 2015, vol. 45, no. 3, pp. 221–223.
3. Apterman V.N. Tymchak V.M. Protyazhnye pechi [Strand-type furnaces]. Moscow: Metallurgiya. 1969, 320 p. (In Russ.).
4. Zainullin L.A., Kalganov M.V., Kalganov D.V., Spirin N.A., Dzyubailo R.V., Li V.A. Furnace of thermal degreasing of fi berglass, equipped with radiation-convection electric heaters. Stal’, 2015, no. 3, pp. 80–82. (In Russ.).
5. Solomakhova T.S., Chebysheva K.V. Tsentrobezhnye ventilyatory: spravochnik [Centrifugal fans: Reference book]. Moscow: Mashinostroenie. 1980, 175 p. (In Russ.).
6. Kalganov V.M., Zainullin L.A., Mekhryakov D.V. etc. Sposob termicheskoi obrabotki liftovykh trub malogo diametra tipa «truba v trube» [A method of heat treating of a small diameter tubing such as “pipe in pipe”]. Patent RF no. 2467077 RF, MPK C 21 D 9/08 (2006.01), F 21 B 17/00 (2006.01), F 27 D 7/04 (2006.01). 2012, Byulleten’ izobretenii, no. 32 (In Russ.).
7. Bloom W. Jet heat reparation of waste furnace gases on strip lines. Iron and Steel Engineer, 1979, no. 12, pp. 32–37.
8. Martin H. Heat and mass transfer between impinging gas jets and solid surfaces. Advances in Heat Transfer, 1977. Vol. 13, pp. 1–60.
9. Launder B.E., Rodi W. The turbulent wall jet. Prog. Aerospace Science, 1981. Vol. 19, pp. 81–128.
10. Mikheev M.A., Mikheeva I.M. Osnovy teploperedachi [Basics of heat transfer]. Moscow: Energiya. 1977, 343 p. (In Russ.).
Review
For citations:
Zainullin L.A., Kalganov M.V., Kalganov D.V., Yarchuk V.F. INVESTIGATION OF COOLING EFFICIENCY OF THE ROTATING HIGH TEMPERATURE FURNACE FAN. Izvestiya. Ferrous Metallurgy. 2015;58(9):662-666. (In Russ.) https://doi.org/10.17073/0368-0797-2015-9-662-666
Views:
596
Email this article 