Using Deform-2d Software to Study Heat-Insulation Materials as Protection of Air Tuyeres Against Burnout
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USING DEFORM-2D SOFTWARE TO STUDY HEAT-INSULATION MATERIALS AS PROTECTION OF AIR TUYERES AGAINST BURNOUT V. N. Titov,1 S. D. Saifullaev,2 M. M. Skripalenko,3 A. I. Ternovykh,4 and A. A. Sidorov5
UDC 669.16.22:621.793
To analyze the dynamics of heating of an air tuyere by the finite-element method (axisymmetric problem), DEFORM-2D software is used. Different heat-insulation materials protecting air tuyeres against burnout were studied. It is recommended to test tuyeres with cones made from siliconized carbon-fiber fabric and ceramics with slip coating. Keywords: blast furnace, air tuyere, DEFORM-2D, temperature field, tuyere burnout, heat insulation, slip coating.
Thermal-spray coatings can be used to improve the durability of metallurgical equipment [1–4] and the quality of metal products [5–8]. A tuyere is one of the major efficiency-critical components of a blast furnace. Failure of tuyeres necessitates blowing out the furnace to replace the failed tuyere. The burnout of air tuyeres as one of the major causes of their replacement was studied in [9–11]. Furnace outage leads to a substantial reduction in the iron output and an increase in the coke consumption. Moreover, tuyeres account for 30% of all heat losses in a furnace. Therefore, it is important to improve their heat resistance and to decrease the heat losses on their surface. This issue is currently resolved by applying thermal-spray coatings and heat-insulation materials of low heat conductivity to the tuyere surface [12–15], lining the air passage with refractories [16–18], etc. To increase the durability of air tuyeres and to decrease the heat losses on their surface, it is reasonable to model their thermal stress state [19–23]. Our goal here is to use modern software to study the thermal state of a blast-furnace tuyere with different types of heat insulation contacting with hot metal. Method of Study We analyzed the thermal losses by a tuyere using the procedure from [24, 25]. The steady-state heatconduction equations for plane and cylindrical walls were used [26]. The procedure allows us to calculate the heat flow through the tuyere surface and the steady-state temperature distribution over it. 1 2 3 4 5
Novolipetsk Steel, Lipetsk, Russia; e-mail: [email protected].
National University of Science and Technology (MISiS), Moscow, Russia; e-mail: [email protected].
National University of Science and Technology (MISiS), Moscow, Russia; e-mail: [email protected]. Novolipetsk Steel, Lipetsk, Russia; e-mail: [email protected].
Moscow State Technological University (STANKIN), Moscow, Russia; e-mail: [email protected].
Translated from Metallurg, Vol. 64, No. 5, pp. 15–20, May, 2020. Original article submitted March 26, 2020. 388
0026-0894/20/0506-0388
© 2020
Springer Science+Business Media, LLC
USING DEFORM-2D SOFTWARE TO STUDY HEAT-INSULATION MATERIALS AS PROTECTION OF AIR TUYERES AGAINST BURNOUT
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Fig. 1. Geometry of air tuyere for DEFORM-2D: 1, air passage; 2, water cooler (of (a) body and (b) nose); 3, outer wall; 4, inner wall; 5, nose
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