关键词: 离心压缩机, 轴瓦, 温度波动, 润滑油, 漆膜

Abstract: The temperature fluctuation of the support bearing bush of the ethylene refrigeration compressor of a domestic 1000 KTA ethylene plant project has affected the safety and stability of the production of the plant. Combining with the operation status monitoring, lubricating oil detection, and bearing bush structure, this paper analyzes the causes of the temperature fluctuation fault of the bearing bush. And it is found that the oxidation of the lubricating oil and the formation of paint film are the direct causes of the temperature fluctuation of the bearing bush in compressor, and structural factors such as the lower limit of the bearing bush installation clearance and the small diameter of the oil inlet hole lead to higher temperature of the bearing bush, which accelerates the oxidation process of the lubricant oil and occurrence of paint film. Through online replacement of lubricating oil and installation of pneumatic oil filter for paint film, the problem of temperature fluctuation of the bearing bush in ethylene refrigeration compressor has been solved effectively, and no temperature alarm has occurred, which meets the requirements for safe and stable production of ethylene plants.

Key words: centrifugal compressor, bearing bush, temperature fluctuation, lubricant oil, paint film