蒸汽动能磨分级机轴承油冷却性能研究

Study on Cooling Performance of Turbine Classifier Bearing for Steam-Powered Jet Mill

利用ANSYS建立过热蒸汽条件下蒸汽动能磨分级机轴承的有限元模型,探讨不同分级机转速轴承摩擦生热、过热蒸汽、油冷却对分级机轴承温升的影响。数值模拟结果表明:分级机转速越高,分级机轴承自身发热温升越高,且上下轴承温升差值越来越大;过热蒸汽传热对分级机轴承温升影响较大,且使得上下轴承的温度差值进一步变大;采用油冷却的方式可使分级机轴承温度低于要求的最高使用温度75℃,而分级腔主轴段温度高于100℃,避免了过热蒸汽出现冷凝的情况。轴承温升实测数据与模拟结果基本一致,表明采用ANSYS数值模拟的方法可有效预测过热蒸汽状态下主轴轴承温度。

The finite element model of turbine classifier bearing for steam jet mill under the condition of superheated steam was established based on ANSYS.The effects of friction heating of the bearings, superheated steam and oil cooling on the temperature rising of classifier bearings were discussed under different classifier rotating speed. The results show that the higher the classifier rotating speed is, the higher the self-heating temperature of classifier bearing is, and the larger the temperature difference between upper bearing and lower bearing becomes.The heat transfer of superheated steam has great influence on temperature rising of classifier bearings , which results in the increase of the temperature difference between the bearings.The method of oil cooling can make the temperature of classifier bearing less than the maximum service tem- perature of 75 ℃ ,and the temperature of classifier spindle higher than 100 ℃ to avoid the steam condensation.Compared the measured data with the simulation results of temperature rising, it shows the temperature of the spindle bearing under the condition of superheated steam could be predicted using the numerical simulation method based on ANSYS.