A method for analyzing and monitoring lubricating oil of a marine main engine

Abstract

The application discloses a kind of ship main engine lubricating oil product analysis monitoring methods, for monitoring and guaranteeing ship main engine lubricating oil quality;Based on offline detection and online detection, the oil quality sensitive parameters of the lubricating oil of multiple main engines of ship are collected and the corresponding dielectric constant, form the relationship curve of oil quality sensitive parameters and dielectric constant based on the cumulative sailing time of ship main engine, can determine the alarm threshold of dielectric constant according to ship age, when its reaches the alarm threshold of the above dielectric constant, alarm, with comprehensiveness, economy and timeliness, the timeliness and accuracy of ship safety monitoring are improved.

Description

Technical Field

[0001] This invention relates to a method for analyzing and monitoring the quality of lubricating oil for marine main engines, used to monitor and ensure the quality of lubricating oil for marine main engines. Background Technology

[0002] The main engine, or marine propulsion unit, is the machinery that provides power to all types of ships. The main engine and its auxiliary equipment provide propulsion and are the heart of the vessel. Currently, there are five main types of main engines: steam engines, steam turbines, diesel engines, gas turbines, and nuclear power plants. Modern transport ships primarily use diesel engines, which are the most numerous. Steam engines once played a crucial role in shipbuilding history, but are now almost entirely obsolete. Steam turbines have long held an advantage on high-powered ships, but are increasingly being replaced by diesel engines. Gas turbines and nuclear power plants are only being tested on a few ships and have not yet been widely adopted. Lubrication is essential for any type of machinery on board. To ensure the stable operation of the main engine under prolonged, high-load conditions, it is necessary to provide effective lubrication to the transmission components of the main engine for extended periods. The lubrication system of the main engine is responsible for lubricating and cooling the transmission structure, thereby reducing friction and the heat generated by friction, preventing damage and overheating of parts. The lubrication system not only provides cooling for the main engine but also removes debris or impurities generated during friction between gears and shafts. Marine lubricating oil is used in the lubrication system of marine main engines. Marine main engine lubricating oil has the characteristics of high load-bearing capacity, excellent thermal oxidation stability, sufficient total alkalinity to neutralize acidic substances to prevent corrosion and wear, excellent detergency and dispersibility, water resistance, and thermal conductivity. Therefore, the key to the high or low lubrication efficiency of the lubrication system lies in ensuring the health and life of the lubricating oil. At present, there is little research on how to monitor the health and life of marine main engine lubricating oil. It is often replaced periodically according to the usage time of the lubricating oil and the number of voyages of the ship. However, this replacement method is prone to the following problems: (1) When the transmission system of the marine main engine experiences abnormal wear due to mechanical failure, a large amount of heat and metal debris will be generated, which will cause the health of the lubricating oil to drop rapidly. This will in turn further accelerate the wear of the main engine. Since the lubricating oil has not reached the predetermined replacement time, it will not be replaced actively. The main engine will continue to operate in a high-wear state, reducing transmission efficiency, increasing oil consumption, and even causing damage to the main engine. (2) When the lubricating oil is in a high health state, it is replaced because the scheduled lubricating oil replacement time has been reached, resulting in the waste of lubricating oil. At the same time, the frequency of ship maintenance is increased, the ship's working time is reduced, and over time, the ship's operation becomes less economical and efficient.

[0003] Therefore, the health of a ship's main engine lubricating oil is crucial for safe navigation and economic efficiency. An important means of ensuring the health of the ship's main engine lubricating oil is its automatic monitoring. Thus, it is necessary to utilize automated and information-based technologies to assist management personnel in automatic monitoring, timely detection of problems, and prompt alerts. Currently, lubricating oil testing is mainly divided into offline testing and online testing.

[0004] Traditional offline methods require sampling before analysis, resulting in high costs per test, long testing cycles, and significant expenditure of manpower, resources, and capital. Furthermore, the analysis results are often delayed and cannot reflect the real-time lubrication status of the equipment. Additionally, the testing process involves numerous contamination points, leading to substantial information loss during sample processing and heavy reliance on the experience and skill of individual operators. This hinders early diagnosis and prevention of mechanical system failures and makes the methods unsuitable for field use. Online monitoring overcomes these problems. Online lubricant monitoring refers to the continuous, in-situ monitoring of the physicochemical, contamination, and wear performance parameters of the lubricant in use through online sensors on the system or equipment without stopping operation. Based on the constant changes in monitored oil parameters, the operating conditions and status of the system or equipment are determined or predicted, diagnosing abnormal components and providing a basis for targeted maintenance and repair, thereby effectively and promptly preventing accidents. However, online monitoring technology requires the additional installation of numerous high-precision sensors and processing systems throughout the ship's hull, making it not only expensive but also costly and cumbersome to maintain. Once an abnormal value is detected, it is impossible to determine whether it is caused by sensor malfunction or a genuine abnormal value. Furthermore, the number of measurable parameters is limited, making it impossible to comprehensively cover relevant data. In addition, the measurement accuracy is limited, which can easily lead to false alarms, resulting in unnecessary maintenance and reduced economic benefits. Summary of the Invention

[0005] To address the above problems, this invention provides a method for analyzing and monitoring marine main engine lubricating oil, comprising the following steps:

[0006] S1. Determine the parent ship type and select multiple oil quality sensitive parameters for main engine lubricating oils;

[0007] The specific steps are as follows: Select a ship of age T1 as the parent ship, and determine the oil quality sensitive parameters M1...M of multiple main engine lubricating oils. n Sensitive parameters for oil quality include water content, abrasive content, viscosity, and temperature.

[0008] S2. Measure the relationship curve between the oil quality sensitive parameter and the dielectric constant K based on the cumulative sailing time of the ship's main engine; step S2 includes the following steps S21-S22; wherein...

[0009] S21: During the cumulative sailing time of the main engine after the ship's main engine is replaced with new lubricating oil, the main engine lubricating oil is sampled at specific time intervals t and tested offline to obtain the oil quality sensitive parameter M1 and dielectric constant K at different times. After multiple measurements, the relationship curve L1 between the oil quality sensitive parameter M1 and dielectric constant K based on the cumulative sailing time of the main engine of the ship with an age of T1 is obtained.

[0010] S22: Oil quality sensitive parameters M2...M for different main engine lubricating oils n The oil quality sensitivity parameters M2...M at different times are obtained by using step S21. n And the corresponding dielectric constant K, after multiple measurements, the oil quality sensitive parameter M2...M for a ship of age T1 based on the cumulative sailing time of the ship's main engine is obtained. n The relationship curves between L2 and the corresponding permittivity K are L…L n ;

[0011] S3. Obtain the alarm threshold for dielectric constant based on the alarm threshold of sensitive parameters of oil quality;

[0012] The specific steps are as follows: Based on the replacement requirements of the main engine lubricating oil, preset multiple oil quality sensitive parameters M1...M... n The alarm threshold is M A1 ...M An Based on the aforementioned relationship curves L1...L of the oil quality sensitive parameter M and dielectric constant K based on the cumulative sailing time of the ship's main engine for ships of age T1,... n The above-mentioned oil quality sensitive parameters M1...M were obtained respectively. n Alarm threshold K for different dielectric constants A1 ...K An ; and from K A1 ...K An The boundary value is selected as the alarm threshold K for the dielectric constant. A The above boundary value is the minimum value;

[0013] S4. Replace ships of different ages to obtain the alarm threshold curves of dielectric constant for ships of different ages.

[0014] The specific steps are as follows: Change the ship's age to T2...T n For each ship, repeat steps S1 to S3 to obtain ship ages T2...T. n The alarm threshold K for the dielectric constant of the ship. A2 ...K An A curve P is obtained showing the alarm threshold for different ship ages corresponding to their dielectric constants.

[0015] S5. Determine the alarm threshold for dielectric constant based on the ship's age, detect the dielectric constant of the main engine lubricating oil during ship navigation, and issue an alarm when it reaches the above-mentioned alarm threshold for dielectric constant.

[0016] The specific steps are as follows: Determine the ship's age T; based on the correspondence between the ship's age T and the alarm threshold curve P corresponding to different ship ages for the dielectric constant, obtain the alarm threshold K for the dielectric constant of the ship at age T. A By installing oil dielectric constant sensors on ships, the dielectric constant K of the main engine lubricating oil is monitored online. When the dielectric constant K reaches the alarm threshold K, the system can detect the problem. A When this happens, the system will issue an alarm, prompting you to change the main unit's lubricating oil.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] (1) Since the wear of the main engine is different for different ship ages, the present invention obtains the alarm threshold curve P of the dielectric constant corresponding to different ship ages by conducting tests on the parent ship of different ages. The alarm threshold of the dielectric constant corresponding to different ship ages can be easily obtained through the curve P, which facilitates the monitoring of the dielectric constant of the main engine lubricating oil.

[0019] (2) This invention combines the advantages of offline and online detection, making the detection of main engine lubricating oil simpler, cheaper, and more accurate. It avoids the disadvantages of offline detection, such as high cost and poor timeliness, as well as the disadvantages of online detection, such as the need to install a large number of expensive high-precision sensors, high maintenance costs, and troublesome maintenance. It enables the detection of main engine lubricating oil by simply measuring the dielectric constant.

[0020] (3) This invention can uniformly measure the age of different ships of the same type, and is particularly suitable for ships of the same type and large number of ships such as government ships and maritime surveillance ships. This makes the alarm threshold curve of dielectric constant of similar ships obtained through previous tests have good adaptability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a method for analyzing and monitoring lubricating oil for marine main engines according to the present invention. Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0023] See Figure 1 This invention provides a method for analyzing and monitoring marine main engine lubricating oil, which includes the following steps:

[0024] S1. Determine the parent ship type and select multiple oil quality sensitive parameters for main engine lubricating oils;

[0025] The specific steps are as follows: Select a ship of age T1 as the parent ship, and determine the oil quality sensitive parameters M1...M of multiple main engine lubricating oils. n Sensitive parameters for oil quality include water content, abrasive content, viscosity, and temperature.

[0026] S2. Measure the relationship curve between the oil quality sensitive parameter and the dielectric constant K based on the cumulative sailing time of the ship's main engine; step S2 includes the following steps S21-S22; wherein...

[0027] S21: During the cumulative sailing time of the main engine after the ship's main engine is replaced with new lubricating oil, the main engine lubricating oil is sampled at specific time intervals t and tested offline to obtain the oil quality sensitive parameter M1 and dielectric constant K at different times. After multiple measurements, the relationship curve L1 between the oil quality sensitive parameter M1 and dielectric constant K based on the cumulative sailing time of the main engine of the ship with an age of T1 is obtained.

[0028] S22: Oil quality sensitive parameters M2...M for different main engine lubricating oils n The oil quality sensitivity parameters M2...M at different times are obtained by using step S21. n And the corresponding dielectric constant K, after multiple measurements, the oil quality sensitive parameter M2...M for a ship of age T1 based on the cumulative sailing time of the ship's main engine is obtained. n The relationship curves between L2 and the corresponding permittivity K are L…L n ;

[0029] S3. Obtain the alarm threshold for dielectric constant based on the alarm threshold of sensitive parameters of oil quality;

[0030] The specific steps are as follows: Based on the replacement requirements of the main engine lubricating oil, preset multiple oil quality sensitive parameters M1...M... n The alarm threshold is M A1 ...M An Based on the aforementioned relationship curves L1...L of the oil quality sensitive parameter M and dielectric constant K based on the cumulative sailing time of the ship's main engine for ships of age T1,... n The above-mentioned oil quality sensitive parameters M1...M were obtained respectively. n Alarm threshold K for different dielectric constants A1 ...K An ; and from K A1 ...K An The boundary value is selected as the alarm threshold K for the dielectric constant. A The above boundary value is the minimum value;

[0031] S4. Replace ships of different ages to obtain the alarm threshold curves of dielectric constant for ships of different ages.

[0032] The specific steps are as follows: Change the ship's age to T2...T n For each ship, repeat steps S1 to S3 to obtain ship ages T2...T. n The alarm threshold K for the dielectric constant of the ship. A2 ...K An A curve P is obtained showing the alarm threshold for different ship ages corresponding to their dielectric constants.

[0033] S5. Determine the alarm threshold for dielectric constant based on the ship's age, detect the dielectric constant of the main engine lubricating oil during ship navigation, and issue an alarm when it reaches the above-mentioned alarm threshold for dielectric constant.

[0034] The specific steps are as follows: Determine the ship's age T; based on the correspondence between the ship's age T and the alarm threshold curve P corresponding to different ship ages for the dielectric constant, obtain the alarm threshold K for the dielectric constant of the ship at age T. A By installing oil dielectric constant sensors on ships, the dielectric constant K of the main engine lubricating oil is monitored online. When the dielectric constant K reaches the alarm threshold K, the system can detect the problem. A When this happens, the system will issue an alarm, prompting you to change the main unit's lubricating oil.

[0035] In practical use, this invention achieves the following technical effects: Since the wear and tear of main engines varies with ship age, this invention, by testing with parent ships of different ages, obtains an alarm threshold curve P for the dielectric constant corresponding to different ship ages. The alarm threshold for the dielectric constant corresponding to different ship ages can be easily obtained from curve P, facilitating the monitoring of the dielectric constant of the main engine lubricating oil. This invention combines the advantages of offline and online detection, making the detection of main engine lubricating oil simpler, cheaper, and more accurate. It avoids the disadvantages of expensive and inefficient offline detection, as well as the disadvantages of online detection, such as the need for numerous expensive high-precision sensors, high maintenance costs, and cumbersome maintenance. It enables the detection of main engine lubricating oil quality by simply measuring the dielectric constant. This invention can perform uniform measurements on different ship ages of the same type, making it particularly suitable for government vessels, maritime surveillance vessels, and other ship types with uniform design and large numbers of vessels. The alarm threshold curves for the dielectric constant of similar ships obtained through preliminary testing have good adaptability.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for analyzing and monitoring the quality of marine main engine lubricating oil, characterized in that, Includes the following steps: S1. Select a vessel with age T1 as the parent vessel and determine the oil quality sensitive parameters M1...M for multiple main engine lubricating oils. n ; S2. Measure the relationship curve between the oil quality sensitive parameter and the dielectric constant K based on the cumulative sailing time of the ship's main engine; step S2 also includes the following steps S21-S22; S21: During the cumulative sailing time of the main engine after the ship's main engine is replaced with new lubricating oil, the main engine lubricating oil is sampled at specific time intervals t and tested offline to obtain the oil quality sensitive parameter M1 and dielectric constant K at different times. After multiple measurements, the relationship curve L1 between the oil quality sensitive parameter M1 and dielectric constant K based on the cumulative sailing time of the main engine of the ship with an age of T1 is obtained. S22: Oil quality sensitive parameters M2...M for different main engine lubricating oils n The oil quality sensitivity parameters M2...M at different times are obtained by using step S21. n And the corresponding dielectric constant K, after multiple measurements, the oil quality sensitive parameter M2...M for a ship of age T1 based on the cumulative sailing time of the ship's main engine is obtained. n The relationship curves between L2 and the corresponding permittivity K are L…L n S3. Based on the main engine lubricating oil replacement requirements, preset multiple oil quality sensitive parameters M1...M for the main engine lubricating oil. n The alarm threshold is M A1 ...M An Based on the aforementioned relationship curves L1...L of the oil quality sensitive parameter M and dielectric constant K based on the cumulative sailing time of the ship's main engine for ships of age T1,... n The above-mentioned oil quality sensitive parameters M1...M were obtained respectively. n Alarm threshold K for different dielectric constants A1 ...K An ; and from K A1 ...K An The boundary value is selected as the alarm threshold K for the dielectric constant. A The above boundary value is the minimum value; S4, Change the ship's age to T2...T n For each ship, repeat steps S1 to S3 to obtain ship ages T2...T. n The alarm threshold K for the dielectric constant of the ship. A2 ...K An A curve P is obtained showing the alarm threshold for different ship ages corresponding to their dielectric constants. S5. Determine the ship's age T. Based on the correspondence between the ship's age T and the alarm threshold curve P corresponding to different ship ages for dielectric constant, obtain the alarm threshold K for the dielectric constant of the ship at age T. A By installing oil dielectric constant sensors on ships, the dielectric constant K of the main engine lubricating oil is monitored online. When the dielectric constant K reaches the alarm threshold K, the system can detect the problem. A When this happens, the system will issue an alarm, prompting you to change the main unit's lubricating oil.

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