Turbine support bearing and thrust bearing temperature changes cause and effect

Turbine support bearing and thrust bearing temperature change reasons and influence - 2019 05 - 28 LuKunChen with inexpensive ( Yang west power plant running with learning platform) Support bearing temperature (1) reasons: (1) bearing reduced the volume of feed into sundry, poor oil return hole; (2) cold lubrication and oil temperature; (3) turbine load increases the axial heat transfer increases; (4) the shaft seal leakage is too large; (5) bearing sharply shell, melting wear or cracking; 6 bearing vibration is too large, destroy an oil film, bad lubrication; All landowners deterioration of oil, the oil in the water. [2] the influence of the bearing temperature changes: (1) bearing temperature rise, want to look at the relationship between the bearing temperature and oil temperature, average return oil temperature is less than the bearing temperature, analyzed is the bearing is generally higher, or an individual bearing temperature, check the oil pressure and oil flow, bearing temperature rise generally, as a general rule, be cooled oil is the oil temperature rise high or low oil pressure of causes; (2) the bearing temperature rise, should also pay attention to the bearing, the oil temperature, general provisions shall not exceed 20 ℃, the temperature difference is too big, that might have inside bearing fault or lubricating oil quantity is insufficient, should strengthen the monitoring of bearing; (3) if a bearing return oil temperature and temperature drop at the same time, the corresponding pressure also decreases, and the oil at constant temperature, usually is caused by the broken tile sharply, at this time should be according to the tile to load and position make corresponding accident forecast and countermeasures, and timely report the relevant departments of the meter reading, analysis on a regular basis. Thrust bearing temperature (1) reasons: (1) turbine load changes, the axial thrust change; (2) after turbine load change, uneven tile demanding, the individual segment temperature change; (3) the temperature too low or the water impact; (4) more vacuum decline; (5) leaf blade serious scaling; 6 shaft seal steam pressure changes; All landowners thrust bearing input change; End thrust segment wear or damage to the unit or just putting-in-service proactively oily errand segment with fat; Pet-name ruby cold oil, the oil temperature change. 2 thrust tile the influence of the temperature change: (1) thrust bearing is composed of thrust tile work and non-work thrust segment. It is under the axial thrust of the rotor, general single-cylinder steam turbine, steam along the flow direction of the direction of the axial thrust, thrust segment by work to bear; Multi-cylinder steam turbine due to the high and middle pressure cylinder steam flow reverse flow, the axial thrust by the difference of the two, if the high pressure cylinder thrust is greater than medium pressure cylinder thrust, can form the axial negative thrust, the non-working thrust segment, under thrust temperature is varied with the change of axial thrust and the corresponding change, sometimes working thrust tile non-working thrust segment have different temperature, an individual segment temperature is very high, it is uneven in under the action of thrust tile demanding or a fault segment, caused by the poor lubrication, the need to strengthen the monitoring, prevent segment all or partial melting, causing serious damage to the parts on steam; (2) the change of the axial thrust, thrust tile of the oil film pressure sensitive than thrust tile temperature changes quickly, the change of the temperature of thrust tile than thrust bearing is sensitive to temperature changes. No push oil film pressure and temperature of thrust tile mark whatever unit, temperature monitoring of thrust bearing more should pay attention to, sometimes thrust bearing temperature rise only 1 ~ 2 ℃, sharply to wear a lot, if the temperature rise of 8 ~ 15 ℃, is not only sharply has melted, and tile itself have also been badly worn.