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Method for detecting whether diesel oil in diesel oil pump leaks into lubricating oil

A lubricating oil and diesel pump technology, applied in the field of analytical chemistry, can solve problems such as not particularly effective and timely methods, metal wear, unstable metal ion content, etc., and achieve the effect of improving specificity and stability

Active Publication Date: 2017-03-22
SGS STANDARD TECHNICAL SERVICES SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Methods to monitor whether diesel oil leaks into lubricating oil include: visually observe whether the lubricating oil level rises, whether the lubricating oil becomes thinner, and judge whether the lubricating oil smells like diesel oil, etc., but these are not particularly effective and timely methods
[0006] The most common instrument-assisted monitoring method is to measure the content of metal ions in lubricating oil, and judge whether there is leakage or not by the change of the content of metal ions. The problem is that the content of metal ions in different batches of lubricating oil and diesel oil is inherently different. It is unstable, and the diesel pump will also have metal wear during operation, so the method of metal ion monitoring is not very accurate
Other methods include the use of gas chromatography to monitor the changes in diesel and lubricating oil components, but the components of diesel and lubricating oil overlap to a large extent, making identification difficult

Method used

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  • Method for detecting whether diesel oil in diesel oil pump leaks into lubricating oil
  • Method for detecting whether diesel oil in diesel oil pump leaks into lubricating oil

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Monitoring diesel oil leakage from high-pressure diesel pumps

[0028] 1) Accurately mix Fluorescent Yellow 131SC fluorescent agent into the diesel oil used, the content of Fluorescent Yellow 131SC fluorescent agent is 2g / kg. Monitor the normal operation of the high-pressure diesel pump for a period of time.

[0029] 2) Take 1g of lubricating oil sample from diesel pump lubricating oil, add n-hexane to dilute to 10mL, take 10uL for liquid chromatography analysis.

[0030] 3) Instrument parameters of liquid chromatography fluorescence detector

[0031] Chromatographic column: ZORBAX XDB C18 2.5mm*46mm (or similar chromatographic column)

[0032] Column temperature: 40°C

[0033] Column flow rate: 1.0mL / min

[0034] Injection volume: 10μL

[0035] Mobile phase: methanol + tert-butyl methyl ether = 10 + 90

[0036] Analysis time: 20min

[0037] The wavelength of the fluorescence detector is set as follows: the excitation wavelength is 494nm, and the emiss...

Embodiment 2

[0040] Example 2: Monitoring diesel oil leakage from high-pressure diesel pumps

[0041] 1) Accurately mix Fluorescent Yellow 131SC fluorescent agent into the diesel oil used, so that the content of Fluorescent Yellow 131SC fluorescent agent is 5g / kg. Monitor the normal operation of the high-pressure diesel pump for a period of time.

[0042] 2) Take 1g of lubricating oil sample from diesel pump lubricating oil, add n-hexane to dilute to 10mL, take 10uL for liquid chromatography analysis.

[0043] 3) Instrument parameters of liquid chromatography fluorescence detector

[0044] Chromatographic column: ZORBAX XDB C18 2.5mm*46mm (or similar chromatographic column)

[0045] Column temperature: 40°C

[0046] Column flow rate: 1.0mL / min

[0047] Injection volume: 10μL

[0048] Mobile phase: methanol + tert-butyl methyl ether = 10 + 90

[0049] Analysis time: 20min

[0050] The wavelength settings of the fluorescence detector are: the excitation wavelength is 494nm, and the em...

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Abstract

The invention belongs to the technical field of analytical chemistry and relates to a method for detecting whether diesel oil in a diesel oil pump leaks into lubricating oil. The method comprises 1) adding a fluorescent probe compound into diesel oil, 2) determining whether diesel oil pump lubricating oil contains the fluorescent probe compound through a liquid chromatography fluorescence detector combined method, and 3) according to the detection result of the step 2, determining whether the diesel oil leaks into the lubricating oil and determining the content of the fluorescent probe compound. Compared with the prior art, the method comprises adding the fluorescent probe compound into diesel oil in advance and regularly monitoring the fluorescent probe compound content.The diesel and lubricating oil do not contain the fluorescent probe compound and the fluorescent agent is stable at a high temperature so that the fluorescent agent is suitable for the diesel engine high temperature operating environment, and the method has high specificity and stability and is suitable for rapid monitoring of leakage of diesel oil in the diesel oil pump into the lubricating oil.

Description

[0001] [technical field] [0002] The invention belongs to the technical field of analytical chemistry, in particular to a method for detecting whether diesel oil in a diesel pump leaks into lubricating oil. [0003] [Background technique] [0004] Diesel pump is an important part of diesel engine, but poor sealing or poor sealing performance during use is a big problem faced by diesel pumps. Due to poor sealing, the diesel in the diesel pump will leak out of the diesel pump, and the lubricating oil will Mixing, resulting in poor lubrication performance, serious wear and tear of the diesel pump, resulting in a larger amount of diesel leakage, which not only seriously affects the performance of diesel locomotives, but also greatly increases energy consumption and wastes energy. Therefore, it is necessary to monitor in time whether the diesel pump is well sealed during operation and whether the diesel oil leaks into the lubricating oil. [0005] The methods for monitoring whethe...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N21/64
CPCG01N21/64G01N30/02G01N2021/6417
Inventor 刘平年冯颖颜立新俞安敏杜佳斌
Owner SGS STANDARD TECHNICAL SERVICES SHANGHAI CO LTD
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