Improvement of the method of complex determination of the nature of cavitation destruction of mineral turbine oil components
DOI:
https://doi.org/10.46299/j.isjea.20250402.10Keywords:
oil-filled equipment, turbine oil, equipment vibration, acoustic cavitation, dissolved gases, additive, nuclear power plantAbstract
Nuclear power plant (NPP) equipment containing turbine oils often operates under conditions of high vibrations. This can: affect the development of acoustic cavitation in turbine oils during their operation in equipment; lead to degradation of turbine oil components and deterioration of its quality. An urgent problem is to determine the nature of the simultaneous effect of acoustic cavitation and temperature on the destruction of turbine oil components. The aim of the study is to improve the method for comprehensively determining the nature of cavitation destruction of mineral turbine oil components with the determination of the content of gases and additives in it and the content of gaseous components in the air or water above the surface of this turbine oil. The subjects of the research are fresh mineral turbine oil “TP-22S (grade 1)”, which contains additives “Ionol”, “B-15/41”, “D-157” and air or hydrogen flows above the surface of this turbine oil. During the research: 1) an installation was improved to comprehensively determine the nature of destruction of turbine oil components in the atmosphere of air or hydrogen under static conditions under the influence of acoustic cavitation at ultrasonic vibration frequencies of 28 kHz or 40 kHz and/or temperature in the temperature range of 20–80 0C; 2) it was established that in the presence of air and under the influence of ultrasonic vibrations on turbine oil in the temperature range of 20–80 0C and the frequencies of these vibrations of 28 kHz and 40 kHz, in turbine oil С2Н6, С2Н4, С2Н2, СН4, Н2, СО, СО2, СОS, СS2, NO, NO2 gases are generated; additives are subject to degradation and reduce their concentrations; an increase in temperature leads to an increase in the concentrations of generated gases in turbine oil; an increase in the frequency of ultrasonic vibrations from 28 kHz to 40 kHz leads to a decrease in the effect on the cavitation degradation of turbine oil components. 3) A similar result was obtained when studying the effect of ultrasonic vibrations in the presence of hydrogen on turbine oil. At the same time, the gases С2Н6, С2Н4, С2Н2, СН4, Н2, СО, СО2, H2S, NH3 are generated in its volume. The obtained results make it possible to use the values of the concentrations of COS, CS2, NO+NO2 gases in the air atmosphere or H2S, NH3 gases in the hydrogen atmosphere above the mineral turbine oil during its operation to identify defects in the oil-filled power equipment of NPPs caused by cavitation in mineral turbine oils. Further research prospects are to determine the effect of acoustic cavitation on the “acid number” and “pH of the water extract” for mineral turbine oils.References
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