Method and device for controlling vibration of heat transfer tube excited by lubricating oil of oil cooler

Abstract

The embodiment of the invention provides a method and device for controlling vibration of a heat transfer pipe excited by lubricating oil of an oil cooler. The method comprises the steps: acquiring the peak frequency of the fluid pulsating pressure of a lubricating oil inlet pipeline of the oil cooler, and if the absolute difference between the peak frequency of the fluid pulsating pressure and the structural natural frequency of the heat transfer pipe or the excitation frequency of cooling water excitation in the heat transfer pipe is reduced to a preset threshold value, determining the volume of the gas to be increased based on the pre-acquired relationship between the volume fraction of the gas in the lubricating oil and the peak frequency of the fluid pulsating pressure obtained in advance, thereby injecting the gas into the lubricating oil inlet pipeline. According to the actually measured relationship between the fluid pulsating pressure frequency spectrum of the lubricating oiland the gas phase fraction, the gas phase fraction of the lubricating oil inlet pipeline is increased to change the fluid pulsating pressure frequency spectrum, so that the peak frequency of the fluidpulsating pressure frequency spectrum avoids the structural natural frequency of the heat transfer pipe and the excitation frequency of cooling water excitation in the heat transfer pipe; and resonance of the heat transfer pipe caused by excitation of the lubricating oil inlet fluid of the oil cooler is avoided.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of vibration control of heat transfer tubes, and more specifically, relate to a control method and device for vibration control of heat transfer tubes excited by lubricating oil of an oil cooler. Background technique [0002] In the steam turbine, the lubricating oil passes through various users and collects to the oil cooler to exchange heat with the cooling water. [0003] When the peak frequency of the fluid pulsation pressure at the lubricating oil inlet of the oil cooler is close to or consistent with the structural natural frequency of the heat transfer tube or the main peak frequency of the pulsation pressure of the cooling water fluid in the heat transfer tube, it will cause resonance and decrease in the heat transfer tube of the oil cooler. The safety, reliability and service life of the oil cooler. [0004] At present, the vibration control of the heat transfer tube of the oi...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for controlling the vibration of the heat transfer tube excited by lubricating oil of the oil cooler, which is used to solve the problem that the vibration control structure of the heat transfer tube of the oil cooler in the prior art cannot be adjusted after the design is completed, and cannot meet the needs of changing work. The defects of the vibration control requirements under the conditions are realized, and the control of the vibration of the heat transfer tube excited by the lubricating oil is realized

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