Ship cooling water frequency conversion energy-saving system based on multi-parameter monitoring

Abstract

The invention provides a multi-parameter monitoring variable-frequency energy-saving ship cooling water system, which is applied to a ship cooling water system, and comprises a multi-parameter cooperative monitoring module, a fuzzy self-adaptive PID controller module, a self-adaptive maintenance module and an edge controller module, the multi-parameter cooperative monitoring module collects operation parameters of the ship cooling water system in real time; the fuzzy self-adaptive PID controller module dynamically adjusts the operation frequency of a sea water pump in the ship cooling water system according to the collected data, and energy-saving optimization is achieved; the self-adaptive maintenance module realizes automatic dirt treatment and corrosion early warning; and the edge controller module is deployed at each sea water pump driving end, receives the frequency instruction of the adaptive maintenance module or the fuzzy adaptive PID control module in real time, drives a frequency converter to adjust the rotating speed of the sea water pump, and realizes local quick response. Through multi-parameter monitoring and fuzzy self-adaptive PID control, pumping energy consumption is remarkably reduced, the response speed and maintenance efficiency of the system are improved, and efficient and stable operation of the ship cooling water system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of ship cooling water systems and energy-saving control technologies. Specifically, it particularly relates to a variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring. Background Art

[0002] The ship cooling water system is an important auxiliary system of the ship power plant. Its main function is to provide cooling for the ship's main engine, generator and other key equipment to ensure that the equipment operates within a safe and stable temperature range. The cooling water system takes away the heat generated by the equipment through circulating cooling water, thereby maintaining the normal working temperature of the equipment, which is of great significance for ensuring the stability and reliability of the ship power system. The operating efficiency and maintenance status of the cooling water system directly affect the operating cost and safety of the ship.

[0003] Traditional ship cooling water systems are usually designed according to the maximum design load to meet the cooling requirements of the ship under various working conditions. However, during actual operation, the load of the ship's main engine and the seawater temperature will fluctuate greatly with seasons, sea areas and ship speeds. Existing systems mostly focus on the adjustment of a single parameter (such as temperature or flow rate), lacking the ability to synergistically optimize multiple parameters (temperature, pressure, corrosion rate, etc.). In addition, the traditional cooling water system lacks the ability of adaptive adjustment during operation, making it difficult to optimize the operation strategy according to the actual working conditions and unable to achieve energy-saving optimization.

[0004] Existing ship cooling water systems have significant deficiencies in terms of energy-saving effect, intelligent management and maintenance efficiency. The seawater pipeline is in long-term contact with seawater and is easily affected by corrosion and fouling accumulation. Fouling will reduce the heat transfer efficiency and increase the maintenance cost. The traditional cooling water system lacks intelligent maintenance management functions, and crew members need to regularly manually check and maintain, making it difficult to detect potential problems in a timely manner. Therefore, developing a variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring is of great significance for improving the energy-saving effect, operation reliability and maintenance efficiency of the ship cooling water system. Summary of the Invention

[0005] In view of the above technical problems regarding the deficiencies of existing ship cooling water systems in terms of energy-saving effect, intelligent management and maintenance efficiency, a variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring is provided. The present invention realizes the high-efficiency energy-saving and intelligent management of the cooling water system through multi-parameter collaborative monitoring, fuzzy adaptive PID control, edge computing and adaptive maintenance.

[0006] The technical means adopted by the present invention are as follows:

[0007] A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring, which is applied to the ship cooling water system, includes: a multi-parameter collaborative monitoring module, a fuzzy adaptive PID controller module, an adaptive maintenance module, and an edge controller module, where:

[0008] The multi-parameter collaborative monitoring module is used to collect the operation parameters of the ship cooling water system in real time, including temperature, pressure, and corrosion rate;

[0009] The fuzzy adaptive PID controller module is connected to the multi-parameter collaborative monitoring module, and dynamically adjusts the operation frequency of the seawater pump in the ship cooling water system according to the data collected by the multi-parameter collaborative monitoring module to achieve energy-saving optimization;

[0010] The adaptive maintenance module is connected to the fuzzy adaptive PID controller module and is used to realize automatic treatment of dirt and corrosion warning;

[0011] The edge controller module is deployed at the driving end of each seawater pump in the ship cooling water system, connected to the fuzzy adaptive PID controller module and the adaptive maintenance module, and receives the frequency commands of the adaptive maintenance module or the fuzzy adaptive PID control module in real time to drive the frequency converter to adjust the speed of the seawater pump to achieve local rapid response.

[0012] Furthermore, the multi-parameter collaborative monitoring module includes a temperature sensor group, a pressure sensor group, and an electrochemical corrosion sensor, where:

[0013] The temperature sensor group is set at the fresh water outlet of the central cooler in the ship cooling water system and is used to monitor the cooling water temperature in real time;

[0014] The pressure sensor group is installed at the seawater inlet and outlet of the central cooler in the ship cooling water system and is used to collect pipeline pressure and pressure difference data;

[0015] The electrochemical corrosion sensor is embedded in the inner wall of the seawater pipeline and is used to detect the corrosion rate of the pipeline.

[0016] Furthermore, the temperature sensor group also includes a redundant backup sensor and a temperature calibration module, where:

[0017] The redundant backup sensor is set at the parallel position of the fresh water outlet of the central cooler and the seawater inlet of the central cooler in the ship cooling water system, and excludes faulty data through a majority voting mechanism;

[0018] The temperature calibration module is used to regularly correct the sensor accuracy through a standard temperature source.

[0019] Further, the measurement accuracy of the temperature sensor group is not lower than ±0.5°C, and the response time does not exceed 2 seconds; the measurement range of the pressure sensor group is 0-10 bar, and the accuracy is not lower than ±0.2 bar.

[0020] Further, the input variable of the fuzzy adaptive PID controller module is the temperature deviation at the fresh water outlet of the central cooler, and the output variable of the fuzzy adaptive PID controller module is the frequency of the frequency converter. The fuzzy adaptive PID control module determines the fuzzy relationship between the PID parameters and the temperature deviation and the rate of change of the temperature deviation, and online modifies the control parameters of the PID according to the fuzzy control rules to meet the different requirements of the temperature deviation and the rate of change of the temperature deviation at different times for the controller parameters.

[0021] Further, the rotation speed of the seawater pump drive motor is controlled by a frequency converter, and the calculation formula for the frequency of the frequency converter is as follows:

[0022]

[0023] where, K p 、K i 、K d respectively represent the control parameters of the fuzzy adaptive PID; T out -T * represents the temperature deviation at the fresh water outlet; T * = 36°C represents the design reference temperature.

[0024] Further, the adaptive maintenance module includes an intelligent backwashing unit and a corrosion warning unit, where:

[0025] The intelligent backwashing unit is used to automatically trigger the high-speed flushing mode according to the fouling pressure difference coefficient, and the triggering condition is: when the fouling pressure difference ΔP = P in -P out exceeds the threshold value, the intelligent backwashing unit outputs a signal to the edge controller module. After receiving the signal, the edge controller module will output the maximum frequency signal to the seawater pump motor frequency converter, and the rotation speed of the seawater pump will be increased to the rated speed until the fouling pressure difference is less than the fouling pressure difference threshold value of the system;

[0026] The corrosion warning unit is used to obtain the corrosion current density i corr through the electrochemical sensor data, calculate the corrosion rate v corr = k·i corr . If the corrosion rate exceeds the threshold value, maintenance suggestions will be pushed, and the remaining service life of the pipeline will be predicted according to the corrosion rate. When the remaining life is lower than the safety threshold value, a replacement warning will be issued.

[0027] Further, the priority of the frequency command of the adaptive maintenance module is higher than that of the frequency command of the fuzzy adaptive PID controller module. When the fouling pressure difference exceeds the threshold, the edge controller module preferentially outputs the maximum frequency to remove the fouling in the seawater pipeline.

[0028] Further, a short pipe is provided at each of the seawater inlet and outlet of the cooler, and the inner wall of the short pipe is coated with a polyethylene coating to prevent premature corrosion of the short pipe.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring provided by the present invention dynamically adjusts the operating frequency of the seawater pump according to the actual working conditions through the fuzzy adaptive PID control module, avoids the long-term over-operation state of the seawater pump, significantly reduces energy waste, and improves the operating efficiency of the cooling water system.

[0031] 2. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring provided by the present invention, its multi-parameter collaborative monitoring module can monitor the operating state of the cooling water system in real time and discover potential problems in time; the adaptive maintenance module can automatically handle fouling and corrosion problems, ensure the long-term stable operation of the system, and reduce the downtime caused by equipment failures.

[0032] 3. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring provided by the present invention, the intelligent backwashing unit and corrosion warning unit of the adaptive maintenance module can automatically perform maintenance operations and push maintenance suggestions in time, reduce the workload of regular manual inspections by crew members, reduce maintenance costs, and improve maintenance efficiency.

[0033] 4. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring provided by the present invention, the entire system realizes the intelligent management of the cooling water system through technical means such as multi-parameter collaborative monitoring, fuzzy adaptive PID control, adaptive maintenance, and edge computing, and can adaptively adjust the operating strategy according to the actual working conditions to optimize the system performance.

[0034] Based on the above reasons, the present invention can be widely promoted in the fields of ship cooling water systems and energy-saving control. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 This is a diagram of the ship cooling water variable frequency energy-saving system based on multi-parameter monitoring of the present invention.

[0037] Figure 2 This is a diagram of the ship cooling water variable frequency energy-saving system provided by an embodiment of the present invention, which is provided with an electrochemical corrosion sensor.

[0038] Figure 3 This is a diagram of the ship cooling water variable frequency energy-saving system provided by an embodiment of the present invention, which is provided with a temperature calibration module.

[0039] Figure 4 This is a schematic diagram of the fuzzy adaptive PID controller based on the temperature deviation of the present invention.

[0040] Figure 5 This is a logic control diagram of the variable frequency system of the cooling pump motor of the present invention. Detailed implementation manners

[0041] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that the terms "including" and "having" in the description and claims of the present invention and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0043] As Figure 1 shown, the present invention provides a ship cooling water variable frequency energy-saving system based on multi-parameter monitoring, which is applied to a ship cooling water system and includes: a multi-parameter collaborative monitoring module, a fuzzy adaptive PID controller module, an adaptive maintenance module, and an edge controller module, wherein:

[0044] The multi-parameter collaborative monitoring module is used to collect the operation parameters of the ship cooling water system in real time, including temperature, pressure, and corrosion rate;

[0045] The fuzzy adaptive PID controller module is connected to the multi-parameter collaborative monitoring module, and dynamically adjusts the operation frequency of the seawater pump in the ship cooling water system according to the data collected by the multi-parameter collaborative monitoring module to achieve energy-saving optimization;

[0046] The adaptive maintenance module is connected to the fuzzy adaptive PID controller module and is used to realize the automatic processing of dirt and corrosion warning;

[0047] The edge controller module is deployed at the driving ends of the seawater pumps in the ship cooling water system, connected to the fuzzy adaptive PID controller module and the adaptive maintenance module, and receives the frequency commands of the adaptive maintenance module or the fuzzy adaptive PID control module in real time, driving the frequency converter to adjust the speed of the seawater pump to achieve local rapid response.

[0048] In specific implementation, as a preferred implementation manner of the present invention, as Figure 2 shown, the multi-parameter collaborative monitoring module includes a temperature sensor group, a pressure sensor group and an electrochemical corrosion sensor, where:

[0049] The temperature sensor group is arranged at the fresh water outlet of the central cooler in the ship cooling water system and is used to monitor the cooling water temperature in real time;

[0050] The pressure sensor group is installed at the seawater inlet and outlet of the central cooler in the ship cooling water system and is used to collect pipeline pressure and differential pressure data;

[0051] The electrochemical corrosion sensor is embedded in the inner wall of the seawater pipeline and is used to detect the corrosion rate of the pipeline.

[0052] In specific implementation, as a preferred implementation manner of the present invention, as Figure 3 shown, the temperature sensor group further includes a redundant backup sensor and a temperature calibration module, where:

[0053] The redundant backup sensor is arranged at the parallel position of the fresh water outlet of the central cooler and the seawater inlet of the central cooler in the ship cooling water system, and excludes faulty data through a majority voting mechanism;

[0054] The temperature calibration module is used to periodically correct the sensor accuracy through a standard temperature source, and the calibration period can be set to monthly or quarterly.

[0055] In specific implementation, as a preferred implementation manner of the present invention, the measurement accuracy of the temperature sensor group is not lower than ±0.5°C, and the response time does not exceed 2 seconds; the measurement range of the pressure sensor group is 0-10 bar, and the accuracy is not lower than ±0.2 bar.

[0056] In specific implementation, as a preferred implementation manner of the present invention, as Figure 4As shown, the input variable of the fuzzy adaptive PID controller module is the temperature deviation at the fresh water outlet of the central cooler, and the output variable of the fuzzy adaptive PID controller module is the frequency of the frequency converter. The fuzzy adaptive PID control module determines the fuzzy relationship between the PID parameters and the temperature deviation and the rate of change of the temperature deviation, and online modifies the control parameters of the PID according to the fuzzy control rules to meet the different requirements of the temperature deviation and the rate of change of the temperature deviation at different times for the controller parameters.

[0057] In specific implementation, as a preferred implementation manner of the present invention, continue to refer to Figure 4 , the rotation speed of the seawater pump drive motor is controlled by a frequency converter, and the calculation formula of the frequency of the frequency converter is as follows:

[0058]

[0059] where, K p , K i , K d respectively represent the control parameters of the fuzzy adaptive PID; T out -T * represents the temperature deviation at the fresh water outlet; T * =36°C represents the design reference temperature.

[0060] In specific implementation, as a preferred implementation manner of the present invention, the adaptive maintenance module includes an intelligent backwashing unit and a corrosion warning unit, wherein:

[0061] The intelligent backwashing unit is used to automatically trigger the high-speed flushing mode according to the fouling pressure difference coefficient, and the triggering condition is: when the fouling pressure difference ΔP = P in -P out exceeds the threshold, the intelligent backwashing unit outputs a signal to the edge controller module. After receiving the signal, the edge controller module outputs the maximum frequency signal to the seawater pump motor frequency converter, and the seawater pump speed is increased to the rated speed until the fouling pressure difference is less than the fouling pressure difference threshold of the system; as Figure 5 shown, it is the logic control diagram of the cooling pump motor frequency conversion system.

[0062] The corrosion warning unit is used to obtain the corrosion current density i corr through the electrochemical sensor data, calculate the corrosion rate v corr =k·i corr , if the corrosion rate exceeds the threshold, push maintenance suggestions, and predict the remaining service life of the pipeline according to the corrosion rate, and issue a replacement warning when the remaining life is lower than the safety threshold.

[0063] In specific implementation, as a preferred implementation manner of the present invention, the priority of the frequency command of the adaptive maintenance module is higher than that of the frequency command of the fuzzy adaptive PID controller module. When the fouling pressure difference exceeds the threshold, the edge controller module preferentially outputs the maximum frequency to remove the fouling in the seawater pipeline.

[0064] In specific implementation, as a preferred implementation manner of the present invention, a short pipe is provided at each of the seawater inlet and outlet of the cooler, and the inner wall of the short pipe is coated with a polyethylene coating to prevent the short pipe from corroding prematurely.

[0065] In specific implementation, as a preferred implementation manner of the present invention, the ship cooling water system is further provided with a regulating valve. The regulating valve is installed in the pipeline of the cooling water system, usually between the seawater pump and the central cooler, or on the inlet and outlet pipelines of the central cooler. The regulating valve is connected to the outlet of the seawater pump through a pipeline and is also connected to the inlet of the central cooler at the same time, playing a role in controlling the cooling water flow; the other end of the regulating valve is connected to the cooling water return pipeline to ensure that the cooling water can flow back to the inlet of the seawater pump or other related equipment smoothly.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring, which is applied to a ship cooling water system, is characterized in that, It includes: A multi-parameter collaborative monitoring module, a fuzzy adaptive PID controller module, an adaptive maintenance module, and an edge controller module, where: The multi-parameter collaborative monitoring module is used to collect the operation parameters of the ship's cooling water system in real time, including temperature, pressure, and corrosion rate; The fuzzy adaptive PID controller module is connected to the multi-parameter collaborative monitoring module and dynamically adjusts the operation frequency of the seawater pump in the ship's cooling water system according to the data collected by the multi-parameter collaborative monitoring module to achieve energy-saving optimization; The adaptive maintenance module is connected to the fuzzy adaptive PID controller module and is used to automatically handle dirt and corrosion warnings; The edge controller module is deployed at the drive end of each seawater pump in the ship's cooling water system, connected to the fuzzy adaptive PID controller module and the adaptive maintenance module, and receives the frequency instructions of the adaptive maintenance module or the fuzzy adaptive PID control module in real time to drive the frequency converter to adjust the speed of the seawater pump to achieve local rapid response.

2. The variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 1, wherein, The multi-parameter collaborative monitoring module includes a temperature sensor group, a pressure sensor group, and an electrochemical corrosion sensor, where: The temperature sensor group is set at the fresh water outlet of the central cooler in the ship's cooling water system and is used to monitor the cooling water temperature in real time; The pressure sensor group is installed at the seawater inlet and outlet of the central cooler in the ship's cooling water system and is used to collect pipeline pressure and differential pressure data; The electrochemical corrosion sensor is embedded in the inner wall of the seawater pipeline and is used to detect the corrosion rate of the pipeline.

3. The variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 2, characterized in that, The temperature sensor group also includes a redundant backup sensor and a temperature calibration module, where: The redundant backup sensor is set at the parallel position of the fresh water outlet of the central cooler and the seawater inlet of the central cooler in the ship's cooling water system, and the faulty data is excluded through the majority voting mechanism; The temperature calibration module is used to periodically correct the sensor accuracy through a standard temperature source.

4. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 2, characterized in that, The measurement accuracy of the temperature sensor group is not less than ±0.5°C, and the response time does not exceed 2 seconds; the measurement range of the pressure sensor group is 0-10 bar, and the accuracy is not less than ±0.2 bar.

5. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 1, characterized in that, The input variable of the fuzzy adaptive PID controller module is the temperature deviation at the fresh water outlet of the central cooler, the output variable of the fuzzy adaptive PID controller module is the frequency of the frequency converter, and the fuzzy adaptive PID control module determines the fuzzy relationship between the PID parameters and the temperature deviation and the change rate of the temperature deviation, and online modifies the control parameters of the PID according to the fuzzy control rules to meet the different requirements of the temperature deviation and the change rate of the temperature deviation at different times for the controller parameters.

6. The variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 5, characterized in that, The speed of the seawater pump drive motor is controlled by the frequency converter, and the calculation formula of the frequency of the frequency converter is as follows: Among them, K p , K i , K d respectively represent the control parameters of the fuzzy adaptive PID; T out -T * represents the deviation of the fresh water outlet temperature; T * = 36 °C represents the design reference temperature.

7. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 1, characterized in that, The adaptive maintenance module includes an intelligent backwashing unit and a corrosion warning unit, where: The intelligent backwashing unit is used to automatically trigger the high-speed flushing mode according to the dirt pressure difference coefficient, and the triggering condition is: when the dirt pressure difference ΔP = P in -P out exceeds the threshold value, the intelligent backwashing unit outputs a signal to the edge controller module. After receiving the signal, the edge controller module outputs the maximum frequency signal to the seawater pump motor frequency converter, and the speed of the seawater pump is increased to the rated speed until the dirt pressure difference is less than the dirt pressure difference threshold value of the system; The corrosion warning unit is used to obtain the corrosion current density i through the electrochemical sensor data corr , calculate the corrosion rate v corr = k·i corr , if the corrosion rate exceeds the threshold, push maintenance suggestions, predict the remaining service life of the pipeline according to the corrosion rate, and issue a replacement warning when the remaining life is lower than the safety threshold.

8. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 1, characterized in that, The priority of the frequency instruction of the adaptive maintenance module is higher than that of the frequency instruction of the fuzzy adaptive PID controller module. When the dirt differential pressure exceeds the threshold, the edge controller module preferentially outputs the maximum frequency to remove the dirt in the seawater pipeline.

9. A variable-frequency energy-saving system for ship cooling water based on multi-parameter monitoring according to claim 1, characterized in that, A short pipe is provided at each of the seawater inlet and outlet of the cooler, and the inner wall of the short pipe is coated with a polyethylene coating to prevent premature corrosion of the short pipe.

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