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| Thermal calculation and analysis of bearings lubricating and cooling system of molten salt pump |
| Shan Chunxian1， Yang Minguan1， Wang Xin2 |
| (1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Mechanical and Electronic Technology Institute, Taizhou Polytechnic College, Taizhou, Jiangsu 225300, China) |
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Abstract The factors affecting the temperature rise of molten salt pump bearing lubrication and cooling system mainly come from bearing friction heat and heat transfer from high temperature molten salt. With the method of thermal nodes network the thermal balance equations were established for bearing lubrication and cooling system of molten salt pumps. Through the calculation of the bearing friction heat and the cooling system thermal resistance and heat transfer, the influence of shaft rotating speed, molten salt temperature, lubricating oil temperature and flow on bearing temperature was obtained. Higher pump rotating speed, the more bearing friction heat. When the shaft rotating speed increased from 500 r/min to 1 500 r/min, the bearing temperature was raised about 20 ℃. When the molten salt temperature was less than 400 ℃, its influence on lubrication system was lesser. When the molten salt temperature was higher than 550 ℃, the bearing temperature was raised rapidly. By keeping the lubricating oil temperature below 40 ℃, and flow rate within 1.5~2.5 L/min, the best effect of the lubrication cooling could be achieved.
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Received: 03 July 2010
Published: 30 November 2010
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