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Lubricating oil residual service life evaluation method based on differential scanning calorimetry

A technology of differential scanning calorimetry and life evaluation, applied in the field of lubricating oil detection, can solve problems such as high disassembly and maintenance costs, loss of parking capacity, and immeasurable comprehensive costs, so as to improve accuracy, expand scope, and estimate The effect of failure time

Inactive Publication Date: 2019-09-10
浙江方圆检测集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, an ordinary wind turbine needs several tons of high-viscosity lubricating oil to be filled at one time, and the cost of a single oil change is as high as tens of thousands of yuan, and the disassembly and maintenance costs of each oil change are very high. The overall cost is immeasurable due to the loss of production capacity caused by parking

Method used

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  • Lubricating oil residual service life evaluation method based on differential scanning calorimetry
  • Lubricating oil residual service life evaluation method based on differential scanning calorimetry
  • Lubricating oil residual service life evaluation method based on differential scanning calorimetry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Oxidation stability test

[0043] Select unused transformer oil and conduct oxidation stability test according to the test requirements of GB / T 12581 "Determination of Oxidation Characteristics of Mineral Oil with Inhibitors". In this embodiment, the measuring instrument is JSH3401 plus inhibitor mineral oil oxidation characteristic tester. During the test period, take samples with test time of 0h, 500h, 1000h, 1500h, 2000h, 2500h, 3000h, 3500h, 4000h, and measure their acid value and viscosity at 40°C respectively to obtain a series of data, as shown in Table 1. Plot the corresponding acid value and 40℃ viscosity curve.

[0044] Table 1 Acid value and viscosity under different oxidation time

[0045]

[0046] Such as figure 1 As shown in the figure, as the oxidation time increases, the acid value and viscosity of the oil sample are increasing. The acid value and viscosity of the oil sample in the early stage of oxidation increase slowly. At a certain time of oxid...

Embodiment 2

[0047] Example 2: DSC test

[0048] The number of the unoxidized new oil is 005, and its remaining service life is 100%. The oil sample that has been oxidized for 4000 hours is numbered 001, and its remaining service life is 0%. Take oil samples with oxidation time of 2550 hours, 1750 hours, and 950 hours respectively, numbered 002, 003, and 004. After determining the DSC test conditions, DSC tests were performed on these five samples. In this embodiment, the DSC test uses a DSC-8000 differential scanning calorimeter.

[0049] The temperature condition of DSC test generally has two kinds of constant temperature method and programmed temperature method. In this embodiment, the heat flow curve of the DSC records the power difference between the input to the sample and the reference, and draws the DSC heat flow graph with time or temperature as the abscissa.

[0050] Such as figure 2 versus image 3 Shown, using the constant temperature method under high-pressure oxygen conditions ...

Embodiment 3

[0064] Example 3: Environmental test of tablet pressing

[0065] In order to verify the degree of influence of the oxygen environment on the test results, a comparison test of the sample preparation environment was carried out.

[0066] Such as Picture 9 versus Picture 10 As shown, take samples of unused transformer oil submitted for inspection, take 2 copies of 10ml each, and number them as new oil 5 and new oil 6. The new oil 5 is compressed in an atmospheric air environment, and the new oil 6 is compressed in an atmospheric oxygen environment. Compare the initial oxidation time and the size of the oxidation exothermic peak when the oil sample is degraded in the two maps. It can be clearly seen that the initial oxidation time of the two test samples is about 18 minutes, which can explain that the parallelism of the two test samples meets the conditions; and the exothermic peak of test sample 2 (oxygen environment compression) is larger. Conducive to the observation and analys...

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Abstract

The invention discloses a lubricating oil residual service life evaluation method based on differential scanning calorimetry, which is related to the technical field of lubricating oil detection and solves the current problem of relatively high cost of periodically changing lubricating oil and serious environmental pollution. A technical scheme of the method has the following key points: acquiringa to-be-detected lubricating oil sample and a reference compound; determining starting oxidation time of oxidation inducing of the sample through the differential scanning calorimetry; establishing aquantitative relation between the starting oxidation time of DSC oxidation inducing and residual service life according to a determination result; evaluating the residual service life of the sample according to the quantitative relation, and obtaining an evaluation result. The method has the effects of learning states of the lubricating oil in equipment timely, estimating failure time of the lubricating oil, avoiding causing accidents by over-due usage of the lubricating oil, consequently improving economic benefits of enterprises and guaranteeing safe operation of the enterprises.

Description

Technical field [0001] The invention relates to the technical field of lubricating oil detection, more specifically, it relates to a method for evaluating the remaining service life of lubricating oil based on differential scanning calorimetry. Background technique [0002] Lubricants can be divided into multiple types according to different operating conditions, but their main functions are basically the same, all of which provide lubrication, anti-wear, cooling and sealing for mechanical parts. During use, the lubricating oil undergoes oxidative degradation due to the effects of high temperature, mechanical shear, catalytic oxidation, etc., which reduces the performance index of the lubricating oil, affects the protective ability of the lubricating oil to the mechanical equipment, and causes the equipment to be damaged. Major accidents will occur. [0003] According to statistics, my country's lubricating oil production in 2013 was close to 7 million tons, and the demand for lub...

Claims

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Application Information

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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 朱凯莫征杰董丹丹叶涛吴智慧凌飞余德清鹿燕胡丹廖上富
Owner 浙江方圆检测集团股份有限公司
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