Suzhou industrial lubricant aging reasons

Factors that contribute to the aging of lubricants include: gas effects, disappearance of additives, oil oxidation, decomposition, evaporation of light components, solid effects, liquid effects, and radiation effects.

First, the presence of oil in the oil will accelerate the aging of the oil and produce emulsification; the same time, the role of additives in the oil to promote its decomposition, leading to equipment corrosion. So to find the main reason for the water in the oil is to find the main reason for the emulsification of oil.

The following analysis of the main causes of oil in water, in practice found that the main cause of oil in the water there are several aspects:

1. Seal radial clearance adjustment is too large, the shaft seal leakage along the shaft flew into the bearing chamber, resulting in oil with water. Unit maintenance, in order to avoid starting during the high-speed rotation of the shaft due to critical speed vibration or rotor thermal expansion and touch the shaft seal tines. Generally increase the shaft seal seal clearance adjustment. In the normal operation of the unit affected the tightness of the shaft seal, causing the shaft seal leak into the bearing chamber along the shaft, which is the root cause of water in the oil.

2. Shaft seal lodging, reducing the sealing effect of oil in water. During the radial clearance adjustment of the shaft seal, considering the expansion of the rotor and the incomplete vibration of the shaft system, the radial clearance of the shaft seal is too small, causing the shaft seal tines and the rotor collision caused by the rotor expansion and shaft vibration Grinding, sharp teeth lodging, reducing the sealing effect, resulting in leakage seal shaft, so that steam along the shaft fleeing into the bearing room.

3. Shaft seal into the steam header for steam pressure is too large, the shaft seal chamber becomes a positive pressure, resulting in shaft seal leakage.

4. Shaft suction pump suction pressure is insufficient, the suction pipe is blocked, resulting in insufficient negative pressure, so that the steam sprays along the shaft, resulting in leakage seal shaft.

Rotation of the gear plate or the back wheel blow the suction effect, resulting in a partial negative bearing housing, inhaling steam. In addition to the main tank exhaust fan exhaust too much, so that bearing negative pressure increases, the shaft seal leakage, easier access to the lubricating oil system.

6. Cylinder surface deformation, the seal is not tight, resulting in steam leaks, into the bearing chamber, the oil with water.

7. Abnormal operating parameters led to the oil cooler side pressure cooling water pressure, and oil cooler leaks.

Second, the oil dissolved in air, especially at high temperatures, will accelerate the oxidation of oil deterioration. Turbine operation, Suzhou industrial lubricants due to the gasification metamorphism produced naphthenic acid soap, colloid and other substances are emulsifiers, the oil more easily emulsified.

Third, the turbine oil emulsification, and additives in the oil properties are also related. Turbine oil additives (such as antioxidants and rust inhibitors), mostly compounds with a certain surface activity or mixture. The molecular structure of these substances, one end is a lipophilic non-polar groups, the other end is a certain surface activity of hydrophilic polar groups. Although all of them are dissolved in oil and do not dissolve in water, the polar groups have certain affinities to water at a certain rotational speed, which increases the difficulty of oil-water separation and promotes the emulsification of oil.

Fourth, intense mixing. When the steam turbine revolves at a high speed, the oil and water are intensely and fully stirred and are in an emulsion state. At this point, the hydrophilic polar groups have the opportunity to fully affinity with water, when the affinity is strong, it will be firmly combined with water. And because lipophilic non-polar groups can dissolve in the oil, so that through the role of this substance so that water and oil together. Therefore, water can not be separated from the oil at this time, that is, emulsification occurs.