A method for evaluating the running state of a ship high-temperature fresh water cooling system

Abstract

The present application relates to a kind of overall monitoring of high-temperature fresh water cooling system, more specifically, it is related to a kind of ship high-temperature fresh water cooling system operating state evaluation method, high-temperature fresh water cooling system mainly includes following part: cylinder liner water buffer cabinet, cylinder liner cooling water discharge cabin, cylinder liner cooling water pump, cylinder liner water preheating pump, cylinder liner water preheating device, cylinder liner water cooler.The present application is processed by the data signal collected in system, in combination with the operating characteristics of system and equipment, utilizes logic judgment and hierarchical analysis method data processing, realizes the health state evaluation of high-temperature fresh water cooling system, and the health state evaluation of system whole is completed by the method of comprehensive evaluation analysis, according to real ship data test verification, system operating state judgment accuracy can reach 96% or more.The present application further realizes the relevant requirements of intelligent cabin part in specification, and also provides certain reference and auxiliary decision for the real-time monitoring of ship operation and the operation management of crew.

Description

Technical Field

[0001] This invention relates to a method for overall monitoring of a high-temperature freshwater cooling system, and more specifically, to a method for assessing the operational status of a ship's high-temperature freshwater cooling system. Background Technology

[0002] Compared to the 2015 version, the 2020 edition of the China Classification Society's "Intelligent Ship Specification" has changed the object of health status assessment from "equipment" to "equipment or system" in Chapter 4, the section on intelligent engine rooms. This reflects that the specification now focuses not only on the operational status of individual devices but also elevates the level of monitoring objects, setting corresponding requirements for the health monitoring of operating systems. Furthermore, compared to equipment, the health status of a system more directly reflects the overall operational status of the ship.

[0003] Currently, most requirements for intelligent ship specifications rely on shipyards collecting and summarizing equipment operation data provided by equipment manufacturers or directly accessing the intelligent data results integrated by the equipment manufacturers themselves to assess the health status of engine room equipment. However, due to the highly customized nature of ship system design, it is difficult to complete the overall health status assessment of the system using a single fixed monitoring value. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a health status assessment method for a ship's high-temperature freshwater cooling system. By processing data signals collected from the system and combining the operating characteristics of the system and equipment, the method utilizes logical judgment and hierarchical analysis for data processing to achieve a health status assessment of the high-temperature freshwater cooling system.

[0005] This invention provides a method for evaluating the operational status of a ship's high-temperature freshwater cooling system, comprising the following steps:

[0006] S1. Collect status data, including the following:

[0007] Main engine cylinder liner water buffer tank level H1, main engine cylinder liner cooling fresh water outlet temperature T1, main engine cylinder liner water buffer tank pressure P1, main engine cylinder liner cooling fresh water pump outlet pressure P2, main engine cylinder liner cooling fresh water inlet pressure P3, main engine high temperature water cooler inlet and outlet pressure difference P4.

[0008] Based on the signal attributes of the collected data, it is divided into three types: liquid level, temperature and pressure, which serve as the middle layer of the hierarchical analysis to determine the standard values ​​and corresponding normal fluctuation ranges of each parameter data.

[0009] Liquid level data:

[0010] Standard value of H1 level in the main engine cylinder liner water buffer tank n1 Minimum value H l1 Maximum value H h1 ;

[0011] Temperature data:

[0012] Standard value of the freshwater outlet temperature T1 of the main engine cylinder liner n1 Minimum value T l1 Maximum value T h1 ;

[0013] Stress data:

[0014] Standard value of pressure P1 in the main engine cylinder liner water buffer tank n1 Minimum value P l1 Maximum value P h1 set up;

[0015] Standard value of the outlet pressure P2 of the main engine cylinder liner cooling freshwater pump P2 n2 Minimum value P l2 Maximum value P h2 ;

[0016] Standard value of freshwater inlet pressure P3 for main engine cylinder liner cooling n3 Minimum value P l3 Maximum value P h3 ;

[0017] Standard value of pressure difference P4 between inlet and outlet of the main unit high-temperature water cooler P4 n4 Let the minimum value be P. l4 Maximum value P h4 ;

[0018] S2. Set the weighting coefficients, including the following:

[0019]

[0020] S3, a) Determine whether each collected data is within the corresponding normal range. If the collected data value is higher than the maximum value or lower than the minimum value, the operating status judgment result is fed back as a system fault, reminding the crew to perform maintenance as soon as possible. Otherwise, perform the following calculation.

[0021] b) Calculate the health status of the basic data layer's liquid level, temperature, and pressure based on the collected data results:

[0022] Basic layer liquid level data health status S 11 :

[0023]

[0024] Basic layer temperature data health status S 21 :

[0025]

[0026] Basic layer pressure data health status S 31 S 32 S 33 S 34 :

[0027]

[0028] c) Calculate the health status of the intermediate layer based on the health status and weighting coefficients of the basic layer data:

[0029] The health status S1 of the intermediate layer liquid level data is:

[0030] S1=ω 11 S 11

[0031] The health status S2 of the intermediate layer temperature data is:

[0032] S2=ω 21 S 21

[0033] The intermediate layer pressure data health status S3 is:

[0034]

[0035] d) Calculate the health status S of the high-temperature freshwater cooling system by combining the health status of the intermediate layer and the weighting coefficients:

[0036]

[0037] In the preferred embodiment, the liquid level data in step S1 is: the standard value H1 of the main engine cylinder liner water buffer tank. n1 Take the 50% liquid level value of the tank, minimum value H l1 Take the corresponding start-up liquid level of the transfer pump, which is usually 30% of the maximum liquid level in the buffer tank, with a maximum value of H. h1 The high alarm level for the main engine cylinder liner water buffer tank is usually 90% of the maximum level of the buffer tank.

[0038] In the preferred embodiment, the temperature data in step S1 is: the standard value T1 of the main engine cylinder liner cooling freshwater outlet temperature. n1 The design outlet temperature for the main engine cylinder liner cooling freshwater is typically 90℃, but the specific temperature will be determined based on the manufacturer's requirements for the specific engine model. The minimum value is T. l1 Set to the minimum allowable cylinder liner cooling freshwater outlet temperature, maximum value T h1 The maximum temperature allowed for the cylinder liner cooling freshwater outlet is set to 90±2℃, but the specific temperature range depends on the manufacturer's requirements for the specific model.

[0039] In the preferred embodiment, the pressure data in step S1 is: the standard value P of the main engine cylinder liner water buffer tank pressure P1. n1The minimum working pressure P is set as the design operating pressure for the main engine cylinder liner water buffer tank. l1 The set trigger pressure for the opening of the air supply solenoid valve for the main engine cylinder liner water buffer cabinet is P, with a maximum value of P. h1 Set the pressure to the safety valve setting of the main unit cylinder liner water buffer cabinet.

[0040] In the preferred embodiment, the pressure data in step S1 is: the standard value P2 of the outlet pressure of the main engine cylinder liner cooling freshwater pump. n2 The minimum design outlet pressure P of the main engine cylinder liner cooling freshwater pump is set. l2 The minimum value P is set as the setpoint for the outlet pressure switch of the main engine cylinder liner cooling freshwater pump. l2 Simultaneously, the setpoint for starting the standby pump, the maximum value P h2 Set the head to the shut-off point of the main engine cylinder liner cooling freshwater pump.

[0041] In the preferred embodiment, the pressure data in step S1 is: the standard value P3 of the main engine cylinder liner cooling freshwater inlet pressure. n3 The minimum design pressure P is set as the inlet pressure of the main engine cylinder liner cooling freshwater. l3 Set as the minimum allowable pressure for the main engine cylinder liner cooling freshwater inlet, and the maximum pressure P. h3 The maximum allowable pressure for the main engine cylinder liner cooling freshwater inlet is set. The inlet pressure range is usually required to be 3 to 5 bar, depending on the manufacturer's requirements for the specific model.

[0042] In the preferred embodiment, the pressure data in step S1 is: the standard value P4 of the pressure difference between the inlet and outlet of the main unit's high-temperature water cooler. n4 The minimum pressure loss P is set as the design operating condition for the main unit's high-temperature water cooler. l4 Set to 85% of the standard value, maximum value P h4 Set the standard value to 115%.

[0043] In the preferred embodiment, step S3 calculates the health status S of the high-temperature freshwater cooling system by combining the health status of the intermediate layer and the weighting coefficient. The value of the calculated result S reflects the operational health status of the entire high-temperature freshwater cooling system. Its value ranges from 0 to 1. The larger the value, the higher the health of the system. Generally, when the value of S is greater than 0.8, the system can be considered to be operating well. When the value is between 0.6 and 0.8, it is necessary to continuously monitor the overall trend of the system health status and subsequent operation. When it is less than 0.6, it reflects that there may be potential faults in the system, and it is necessary to check the operating status of the equipment and system pipelines in a timely manner.

[0044] This invention enables comprehensive monitoring of a high-temperature freshwater cooling system and completes an overall health status assessment of the system through a comprehensive evaluation and analysis method. Verified using actual ship data, the system's operational status assessment accuracy reaches over 96%. This invention further fulfills the relevant requirements for the intelligent engine room in the specifications, and also provides certain references and auxiliary decision-making for real-time monitoring of ship operations and crew management. Attached Figure Description

[0045] Figure 1 This is a logic diagram for judging the operating status of a high-temperature freshwater cooling system. Detailed Implementation

[0046] like Figure 1 As shown, this invention is a method for evaluating the operational status of a ship's high-temperature freshwater cooling system, comprising the following steps:

[0047] 1. The status data of key operating points in the acquisition system serves as preliminary judgment data and the basic data layer in hierarchical analysis. The acquired data in the high-temperature freshwater cooling system includes the following:

[0048] The liquid level of the cylinder liner water buffer tank is H1, the outlet temperature of the main engine cylinder liner cooling fresh water is T1, the pressure of the main engine cylinder liner water buffer tank is P1, the outlet pressure of the main engine cylinder liner cooling fresh water pump is P2, the inlet pressure of the main engine cylinder liner cooling fresh water is P3, and the inlet and outlet pressure difference of the main engine high temperature water cooler is P4.

[0049] Based on the signal attributes of the collected data, it is divided into three types: liquid level, temperature and pressure, which serve as the middle layer of the hierarchical analysis. According to the design characteristics of the system and equipment, the standard values ​​and corresponding normal fluctuation ranges of each parameter data are determined.

[0050] Liquid level data:

[0051] Standard value of H1 level in the main engine cylinder liner water buffer tank n1 Take the 50% liquid level value of the tank, minimum value H l1 Take the corresponding start-up liquid level of the transfer pump (usually 30% of the maximum liquid level in the buffer tank), and the maximum value H. h1 The high alarm level of the main unit cylinder liner water buffer tank is set to 90% of the maximum level of the buffer tank.

[0052] Temperature data:

[0053] Standard value of the freshwater outlet temperature T1 of the main engine cylinder liner cooling system n1 The minimum value T is set as the design outlet temperature of the coolant for the main engine cylinder liner (usually 90℃, but the specific temperature depends on the manufacturer's requirements for the engine model). l1 Set to the minimum allowable cylinder liner cooling freshwater outlet temperature, maximum value T h1Set to the maximum allowable temperature of the cylinder liner cooling freshwater outlet. (The typical temperature range is 90±2℃, but the specific range depends on the manufacturer's requirements for the specific model.)

[0054] Stress data:

[0055] Standard value of pressure P1 in the main engine cylinder liner water buffer tank n1 The minimum working pressure P is set as the design operating pressure for the main engine cylinder liner water buffer tank. l1 The set trigger pressure for the opening of the air supply solenoid valve for the main engine cylinder liner water buffer cabinet is P, with a maximum value of P. h1 Set the pressure to the safety valve setting of the main unit cylinder liner water buffer tank;

[0056] Standard value of the outlet pressure P2 of the main engine cylinder liner cooling freshwater pump P2 n2 The minimum design outlet pressure P of the main engine cylinder liner cooling freshwater pump is set. l2 The set value for the outlet pressure switch of the main engine cylinder liner cooling freshwater pump (starting the standby pump) is P, with a maximum value of P. h2 Set the head of the main engine cylinder liner cooling freshwater pump (centrifugal pump) to the shut-off point;

[0057] Standard value of the freshwater inlet pressure P3 for the main engine cylinder liner cooling system n3 The minimum design pressure P is set as the inlet pressure of the main engine cylinder liner cooling freshwater. l3 Set as the minimum allowable pressure for the main engine cylinder liner cooling freshwater inlet, and the maximum pressure P. h3 Set to the maximum allowable pressure of the main engine cylinder liner cooling freshwater inlet (usually the inlet pressure range is required to be 3 to 5 bar, depending on the manufacturer's requirements for the specific model);

[0058] Standard value of pressure difference P4 between inlet and outlet of the main unit high-temperature water cooler P4 n4 The minimum pressure loss P is set as the design operating condition for the main unit's high-temperature water cooler. l4 Set to 85% of the standard value, maximum value P h4 Set the standard value to 115%.

[0059] 2. Set the weight coefficients for each basic data layer and intermediate layer, as follows:

[0060] Table 1. Weight coefficients of each layer in the hierarchical analysis.

[0061]

[0062] 3. a) Determine whether each collected data is within the corresponding normal range. If the collected data value is higher than the maximum value or lower than the minimum value, the operating status judgment result is fed back as a system fault, reminding the crew to perform maintenance as soon as possible. If each parameter is between the corresponding minimum and maximum values, then perform subsequent calculations.

[0063] b) Calculate the health status of the basic data layer's liquid level, temperature, and pressure based on the collected data results:

[0064] Basic layer liquid level data health status S 11 :

[0065]

[0066] Basic layer temperature data health status S 21 :

[0067]

[0068] Basic layer pressure data health status S 31 S 32 S 33 S 34 :

[0069]

[0070] c) Calculate the health status of the intermediate layer based on the health status and weighting coefficients of the basic layer data:

[0071] The health status S1 of the intermediate layer liquid level data is:

[0072] S1=ω 11 S 11

[0073] The health status S2 of the intermediate layer temperature data is:

[0074] S2=ω 21 S 21

[0075] The intermediate layer pressure data health status S3 is:

[0076]

[0077] d) Calculate the health status S of the high-temperature freshwater cooling system by combining the health status of the intermediate layer and the weighting coefficients:

[0078]

[0079] The calculated value of S reflects the operational health status of the entire high-temperature freshwater cooling system. Its value ranges from 0 to 1. The larger the value, the higher the health of the system. Generally, when the S value is greater than 0.8, the system can be considered to be operating well. When the value is between 0.6 and 0.8, it is necessary to continuously monitor the overall trend of the system's health status and subsequent operation. When it is less than 0.6, it reflects that there may be potential faults in the system, and the operating status of the equipment and system pipelines needs to be checked in a timely manner.

[0080] This invention can monitor the overall operating status of a ship's high-temperature freshwater cooling system. Based on the overall analysis of the collected data, it comprehensively processes the characteristic data of the equipment and pipelines to calculate and evaluate the current health status of the high-temperature freshwater cooling system, thus realizing the overall monitoring of the high-temperature freshwater cooling system. The overall health status assessment of the system is completed through a comprehensive evaluation and analysis method. According to actual ship data testing and verification, the accuracy rate of system operating status judgment can reach over 96%, further fulfilling the relevant requirements of the intelligent engine room in the specifications. At the same time, it also provides certain references and auxiliary decision-making for real-time monitoring of ship operation and crew operation management.

[0081] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for evaluating the operational status of a ship's high-temperature freshwater cooling system, characterized in that, Includes the following steps: S1. Collect status data, including the following: Main engine cylinder liner water buffer tank level H1, main engine cylinder liner cooling fresh water outlet temperature T1, main engine cylinder liner water buffer tank pressure P1, main engine cylinder liner cooling fresh water pump outlet pressure P2, main engine cylinder liner cooling fresh water inlet pressure P3, main engine high temperature water cooler inlet and outlet pressure difference P4. Based on the signal attributes of the collected data, it is divided into three types: liquid level, temperature and pressure, which serve as the middle layer of the hierarchical analysis to determine the standard values ​​and corresponding normal fluctuation ranges of each parameter data. Liquid level data: Standard value of H1 level in the main engine cylinder liner water buffer tank n1 Minimum value H l1 Maximum value H h1 ; Temperature data: Standard value of the freshwater outlet temperature T1 of the main engine cylinder liner cooling system n1 Minimum value T l1 Maximum value T h1 ; Stress data: Standard value of pressure P1 in the main engine cylinder liner water buffer tank n1 Minimum value P l1 Maximum value P h1 ; Standard value of the outlet pressure P2 of the main engine cylinder liner cooling freshwater pump P2 n2 Minimum value P l2 Maximum value P h2 ; Standard value of the freshwater inlet pressure P3 for the main engine cylinder liner cooling system n3 Minimum value P l3 Maximum value P h3 ; Standard value of pressure difference P4 between inlet and outlet of the main unit high-temperature water cooler P4 n4 Minimum value P l4 Maximum value P h4 ; S2. Set the weighting coefficients, including the following: S3, a) Determine whether each collected data is within the corresponding normal range. If the collected data value is higher than the maximum value or lower than the minimum value, the operating status judgment result is fed back as a system fault, reminding the crew to perform maintenance as soon as possible. Otherwise, perform the following calculation. b) Calculate the health status of the basic data layer's liquid level, temperature, and pressure based on the collected data results: Basic layer liquid level data health status S 11 : Basic layer temperature data health status S 21 : Basic layer pressure data health status S 31 S 32 S 33 S 34 : c) Calculate the health status of the intermediate layer based on the health status and weighting coefficients of the basic layer data: The health status S1 of the intermediate layer liquid level data is: The health status S2 of the intermediate layer temperature data is: The intermediate layer pressure data health status S3 is: d) Calculate the health status S of the high-temperature freshwater cooling system by combining the health status of the intermediate layer and the weighting coefficients: 。 2. The method for evaluating the operating status of a ship's high-temperature freshwater cooling system according to claim 1, characterized in that, The liquid level data in step S1: the standard value of the liquid level H1 in the main engine cylinder liner water buffer tank. n1 Take the 50% liquid level value of the tank, minimum value H l1 Take the corresponding start-up liquid level of the transfer pump, which is 30% of the maximum liquid level of the buffer tank, with a maximum value of H. h1 The high alarm level of the main unit cylinder liner water buffer tank is set to 90% of the maximum level of the buffer tank.

3. The method for evaluating the operating status of a ship's high-temperature freshwater cooling system according to claim 1, characterized in that, The temperature data in step S1: the standard value of the main engine cylinder liner cooling freshwater outlet temperature T1. n1 The design outlet temperature for the main engine cylinder liner cooling freshwater is set at 90℃, but the specific temperature will be determined based on the manufacturer's requirements for the specific engine model. The minimum value is T. l1 Set to the minimum allowable cylinder liner cooling freshwater outlet temperature, maximum value T h1 The maximum allowable temperature for the freshwater outlet of the cylinder liner cooling system is set to 90±2℃, with the specific temperature range to be determined based on the manufacturer's requirements for the specific model.

4. The method for evaluating the operating status of a ship's high-temperature freshwater cooling system according to claim 1, characterized in that, The pressure data in step S1: the standard value of the pressure P1 in the main engine cylinder liner water buffer tank. n1 The minimum working pressure P is set as the design operating pressure for the main engine cylinder liner water buffer tank. l1 The set trigger pressure for the opening of the air supply solenoid valve for the main engine cylinder liner water buffer cabinet is P, with a maximum value of P. h1 Set the pressure to the safety valve setting of the main unit cylinder liner water buffer cabinet.

5. The method for evaluating the operating status of a ship's high-temperature freshwater cooling system according to claim 1, characterized in that, The pressure data in step S1: the standard value of the outlet pressure P2 of the main engine cylinder liner cooling freshwater pump. n2 The minimum design outlet pressure P is set for the main engine cylinder liner cooling freshwater pump. l2 The minimum value P is set as the setpoint for the outlet pressure switch of the main engine cylinder liner cooling freshwater pump. l2 Simultaneously, the setpoint for starting the standby pump, the maximum value P h2 Set the head to the shut-off point of the main engine cylinder liner cooling freshwater pump.

6. The method for evaluating the operating status of a ship's high-temperature freshwater cooling system according to claim 1, characterized in that, The pressure data in step S1: Standard value of the main engine cylinder liner cooling freshwater inlet pressure P3 P n3 The minimum design pressure P is set as the inlet pressure of the main engine cylinder liner cooling freshwater. l3 Set as the minimum allowable pressure for the main engine cylinder liner cooling freshwater inlet, and the maximum pressure P. h3 The maximum allowable pressure for the main unit cylinder liner cooling freshwater inlet is set to 3~5 bar, depending on the manufacturer's requirements for the specific model.

7. The method for evaluating the operating status of a ship's high-temperature freshwater cooling system according to claim 1, characterized in that, The pressure data in step S1: the standard value of the pressure difference P4 between the inlet and outlet of the main unit's high-temperature water cooler. n4 The minimum pressure loss P is set as the design operating condition for the main unit's high-temperature water cooler. l4 Set to 85% of the standard value, maximum value P h4 Set the standard value to 115%.

8. The method for evaluating the operating status of a ship's high-temperature freshwater cooling system according to claim 1, characterized in that, Step S3 calculates the health status S of the high-temperature freshwater cooling system by combining the health status of the intermediate layer and the weighting coefficient. The value of the calculated result S reflects the operational health status of the entire high-temperature freshwater cooling system. Its value ranges from 0 to 1. The larger the value, the higher the health of the system. When the value of S is greater than 0.8, the system can be considered to be operating well. When the value is between 0.6 and 0.8, it is necessary to continuously monitor the overall trend of the system health status and subsequent operation. When it is less than 0.6, it reflects that there may be potential faults in the system, and it is necessary to check the operating status of the equipment and system pipelines in a timely manner.

Images