An on-line monitoring and evaluation device and method for the energy efficiency of a ship's seawater cooling system

Abstract

The present invention relates to an on-line monitoring and evaluation device and method for the energy efficiency of a ship's seawater cooling system. The device includes an information collection module and an evaluation module. The information collection module is used to collect the current energy efficiency data of the ship's seawater cooling system and upload the collected current energy efficiency data to the evaluation module. The evaluation module is used to evaluate the energy efficiency of the heat exchanger, the seawater pump and the overall energy efficiency of the ship's seawater cooling system according to the current energy efficiency data, and obtain the evaluation result. The present invention uses the on-line monitoring and evaluation device for the energy efficiency of the ship's seawater cooling system to monitor and evaluate the energy efficiency of the ship's seawater cooling system, so that the user can repair or maintain the ship's seawater cooling system according to the energy efficiency evaluation result, and solves the technical problem that the reliability of the main engine, the safety and economy of the ship are reduced due to the too low energy efficiency value of the ship's seawater cooling system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy conservation of ship seawater cooling systems, and particularly to an on-line monitoring and evaluation device and method for the energy efficiency of ship seawater cooling systems. Background Art

[0002] The ship seawater cooling system is a subsystem of the ship's central cooling system. This system uses seawater to cool the low-temperature fresh water in the central cooling system to achieve the circulating cooling of the low-temperature fresh water.

[0003] Currently, most ship seawater cooling systems mainly consist of heat exchangers, variable-frequency seawater pumps, and seawater pipes. During the operation of the ship seawater cooling system, due to the seawater inside the system, scaling and corrosion will occur in the heat exchangers, seawater pumps, and seawater pipes, resulting in a decrease in the efficiency of the heat exchangers and an increase in the power consumption of the variable-frequency seawater pumps. In severe cases, it will also affect the cooling effect of the seawater cooling system, and further affect the reliability of the main engine, as well as the safety and economy of the ship.

[0004] Therefore, there is an urgent need to design an on-line monitoring and evaluation device for the energy efficiency of ship seawater cooling systems to ensure that the ship seawater cooling system is above the normal energy efficiency level. Summary of the Invention

[0005] In view of this, it is necessary to provide an on-line monitoring and evaluation device and method for the energy efficiency of ship seawater cooling systems to solve the technical problems of reducing the reliability of the main engine, as well as the safety and economy of the ship due to too low energy efficiency values of the ship seawater cooling system.

[0006] To solve the above problems, the present invention provides an on-line monitoring and evaluation device for the energy efficiency of ship seawater cooling systems, including an information collection module and an evaluation module;

[0007] The information collection module is used to collect the current energy efficiency data of the ship seawater cooling system and upload the collected current energy efficiency data to the evaluation module;

[0008] The evaluation module is used to evaluate the energy efficiency of the heat exchanger, the energy efficiency of the seawater pump, and the overall energy efficiency of the ship seawater cooling system according to the current energy efficiency data, and obtain an evaluation result;

[0009] Among them, the ship seawater cooling system includes a heat exchanger and a seawater pump. The current energy efficiency data includes the current seawater inlet temperature value of the heat exchanger, the current fresh water inlet temperature value of the heat exchanger, the current fresh water outlet temperature value of the heat exchanger, the current seawater inlet flow value of the heat exchanger, the current fresh water inlet flow value of the heat exchanger, the current seawater outlet pressure value of the seawater pump, and the current power consumption of the seawater pump. The heat exchanger energy efficiency refers to the efficiency of the heat exchanger in transferring the heat of fresh water to seawater. The seawater pump energy efficiency refers to the ratio of the total amount of seawater pumped by the seawater pump to the total power consumption of the seawater pump. The overall energy efficiency refers to the ratio of the total heat exchange of the ship seawater cooling system to the total power consumption of the ship seawater cooling system.

[0010] Optionally, the information collection module includes a temperature collection unit, a flow collection unit, a pressure collection unit, and an electric energy collection unit;

[0011] The temperature collection unit is used to collect the current seawater inlet temperature value, the current fresh water inlet temperature value, and the current fresh water outlet temperature value;

[0012] The flow collection unit is used to collect the current seawater inlet flow value and the current fresh water inlet flow value;

[0013] The pressure collection unit is used to collect the current seawater outlet pressure value;

[0014] The electric energy collection unit is used to collect the current power consumption.

[0015] Optionally, it is characterized in that the evaluation module includes an energy efficiency index evaluation unit, a heat exchanger evaluation unit, and a seawater pump evaluation unit;

[0016] The energy efficiency index evaluation unit is used to calculate the current energy efficiency index from the current energy efficiency data, and compare the current energy efficiency index with the corresponding historical energy efficiency index to obtain the overall energy efficiency evaluation result;

[0017] The heat exchanger evaluation unit is used to calculate the reference fresh water outlet temperature value according to the preset heat exchanger model for the current heat exchanger energy efficiency data, and compare the current fresh water outlet temperature value with the reference fresh water outlet temperature value to obtain the heat exchanger energy efficiency evaluation result;

[0018] The seawater pump evaluation unit is used to calculate the reference power consumption according to the preset seawater pump model for the current seawater pump energy efficiency data, and compare the current power consumption with the reference power consumption to obtain the seawater pump energy efficiency evaluation result;

[0019] Among them, the current heat exchanger energy efficiency data includes the current fresh water inlet temperature value, the current fresh water outlet temperature value, the current seawater inlet temperature value, the current seawater inlet flow rate value, and the current fresh water inlet flow rate value. The current seawater pump energy efficiency data includes the current seawater inlet flow rate value, the current seawater outlet pressure value, and the current power consumption. The heat exchanger energy efficiency refers to the efficiency of the heat exchanger in transferring the heat of fresh water to seawater. The seawater pump energy efficiency refers to the ratio of the total amount of seawater pumped by the seawater pump to the total power consumption of the seawater pump. The overall energy efficiency refers to the ratio of the total heat exchange amount of the ship's seawater cooling system to the total power consumption of the ship's seawater cooling system.

[0020] The present invention also provides an on-line monitoring and evaluation method for the energy efficiency of a ship's seawater cooling system, which is applied to the on-line monitoring and evaluation device for the energy efficiency of a ship's seawater cooling system in any of the above possible implementation manners. The on-line monitoring and evaluation method for the energy efficiency of a ship's seawater cooling system includes the following steps:

[0021] Obtain the current energy efficiency data of the ship's seawater cooling system based on the information acquisition module;

[0022] According to the current energy efficiency data, use the evaluation module to evaluate the heat exchanger energy efficiency, seawater pump energy efficiency, and overall energy efficiency of the ship's seawater cooling system to obtain an evaluation result;

[0023] Among them, the ship's seawater cooling system includes a heat exchanger and a seawater pump. The current energy efficiency data includes the current seawater inlet temperature value of the heat exchanger, the current fresh water inlet temperature value of the heat exchanger, the current fresh water outlet temperature value of the heat exchanger, the current seawater inlet flow rate value of the heat exchanger, the current fresh water inlet flow rate value of the heat exchanger, the current seawater outlet pressure value of the seawater pump, and the current power consumption of the seawater pump.

[0024] Optionally, the step of obtaining the current energy efficiency data of the ship's seawater cooling system based on the information acquisition module includes:

[0025] Obtain the current seawater inlet temperature value, the current fresh water inlet temperature value, and the current fresh water outlet temperature value based on the temperature acquisition unit;

[0026] Obtain the current seawater inlet flow rate value and the current fresh water inlet flow rate value based on the flow rate acquisition unit;

[0027] Obtain the current seawater outlet pressure value based on the pressure acquisition unit;

[0028] Obtain the current power consumption based on the electric energy acquisition unit.

[0029] Optionally, it is characterized in that the step of evaluating the heat exchanger energy efficiency, seawater pump energy efficiency and overall energy efficiency of the ship seawater cooling system by using an evaluation module according to the current energy efficiency data includes:

[0030] Calculating according to the current energy efficiency data to obtain a current energy efficiency index;

[0031] Comparing the current energy efficiency index with the corresponding historical energy efficiency index to obtain an overall energy efficiency evaluation result;

[0032] Calculating the current heat exchanger energy efficiency data by using a preset heat exchanger model to obtain a reference temperature value of the fresh water outlet, and comparing the current fresh water outlet temperature value with the reference temperature value of the fresh water outlet to obtain a heat exchanger energy efficiency evaluation result;

[0033] Calculating the current seawater pump energy efficiency data by using a preset seawater pump model to obtain a reference power consumption, and comparing the current power consumption with the reference power consumption to obtain a seawater pump energy efficiency evaluation result;

[0034] Wherein, the current heat exchanger energy efficiency data includes the current fresh water inlet temperature value, the current fresh water outlet temperature value, the current seawater inlet temperature value, the current seawater inlet flow value and the current fresh water inlet flow value, and the current seawater pump energy efficiency data includes the current seawater inlet flow value, the current seawater outlet pressure value and the current power consumption.

[0035] Optionally, the step of calculating according to the current energy efficiency data to obtain a current energy efficiency index includes:

[0036] Obtaining an energy efficiency index formula;

[0037] Calculating the current energy efficiency data by using the energy efficiency index formula to obtain a current energy efficiency index;

[0038] Wherein, the energy efficiency index formula includes:

[0039]

[0040] In the formula, is the energy efficiency index; is the specific heat capacity of fresh water; is the mass flow rate of fresh water flowing through the heat exchanger; The fresh water outlet temperature of the fresh water flowing through the heat exchanger; The fresh water outlet temperature of the fresh water flowing through the heat exchanger.

[0041] Optionally, the step of comparing the current energy efficiency index with the corresponding historical energy efficiency index to obtain an overall energy efficiency evaluation result includes:

[0042] Screen out historical system operating condition data corresponding to the current system operating condition from the system database according to the current seawater inlet temperature value and the current power consumption;

[0043] Calculate the historical system operating condition data using the energy efficiency index formula to obtain the historical energy efficiency index;

[0044] Calculate the current energy efficiency index and the historical energy efficiency index to obtain the index deviation value;

[0045] When the index deviation value is greater than the preset index deviation threshold, the obtained overall energy efficiency evaluation result is that the system energy efficiency has decreased;

[0046] When the index deviation value is less than the preset index deviation threshold, the obtained overall energy efficiency evaluation result is that the system energy efficiency is normal.

[0047] Optionally, the step of calculating the current heat exchanger energy efficiency data using a preset heat exchanger model to obtain the reference temperature value of the fresh water outlet and comparing the current fresh water outlet temperature value with the reference temperature value of the fresh water outlet includes:

[0048] Input the current fresh water inlet temperature value, the current seawater inlet temperature value, the current seawater inlet flow value, and the current fresh water inlet flow value into the preset heat exchanger model, and calculate based on the preset heat exchanger model to obtain the reference temperature value of the fresh water outlet;

[0049] Calculate the difference between the current fresh water outlet temperature value and the reference temperature value of the fresh water outlet to obtain the temperature deviation value;

[0050] When the temperature deviation value is greater than the preset temperature deviation threshold, the obtained heat exchanger energy efficiency evaluation result is that the heat exchanger energy efficiency has decreased;

[0051] When the temperature deviation value is less than the preset temperature deviation threshold, the obtained heat exchanger energy efficiency evaluation result is that the heat exchanger energy efficiency is normal.

[0052] Optionally, the step of comparing the current seawater pump energy efficiency data with the corresponding historical seawater pump energy efficiency data to obtain the seawater pump energy efficiency evaluation result includes:

[0053] Input the current seawater inlet flow value and the current seawater outlet pressure value into the preset seawater pump model, and calculate based on the preset seawater pump model to obtain the reference power consumption;

[0054] Calculate the difference between the current power consumption and the reference power consumption to obtain the power consumption deviation value;

[0055] When the electricity consumption deviation value is greater than the preset electricity consumption deviation threshold, the obtained energy efficiency evaluation result of the seawater pump is that the energy efficiency of the seawater pump decreases;

[0056] When the electricity consumption deviation value is less than the preset electricity consumption deviation threshold, the obtained energy efficiency evaluation result of the seawater pump is that the energy efficiency of the seawater pump is normal.

[0057] The beneficial effects of adopting the above embodiments are as follows: The on-line monitoring and evaluation device for the energy efficiency of the ship seawater cooling system provided by the present invention collects the current energy efficiency data of the ship seawater cooling system in real time through the information collection module, enabling users to intuitively monitor the current operating conditions of the heat exchanger and the seawater pump. The evaluation module also calculates the current energy efficiency data to obtain the energy efficiency evaluation result of the heat exchanger, the energy efficiency evaluation result of the seawater pump, and the overall energy efficiency evaluation result of the ship seawater cooling system, allowing users to repair or maintain the ship seawater cooling system according to the energy efficiency evaluation results, and solving the technical problem that the reliability of the main engine, as well as the safety and economy of the ship, are reduced due to the too low energy efficiency value of the ship seawater cooling system. Brief Description of the Drawings

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0059] FIG. 1 is a schematic structural diagram of an embodiment of the on-line monitoring and evaluation device for the energy efficiency of the ship seawater cooling system provided by the present invention;

[0060] Figure 2 is a schematic flowchart of an embodiment of the on-line monitoring and evaluation method for the energy efficiency of the ship seawater cooling system provided by the present invention;

[0061] Figure 3 For the present invention Figure 2 is a schematic flowchart of an embodiment of step S210 in the present invention;

[0062] Figure 4 For the present invention Figure 2 is a schematic flowchart of an embodiment of step S220 in the present invention;

[0063] Figure 5 For the present invention Figure 4 is a schematic flowchart of an embodiment of step S420 in the present invention;

[0064] Figure 6 For the present invention Figure 4 is a schematic flowchart of an embodiment of step S430 in the present invention;

[0065] Figure 7 For the present invention Figure 4 is a schematic flowchart of an embodiment of step S440 in the present invention. Specific embodiments

[0066] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0067] It should be understood that the schematic drawings are not drawn to actual scale. The flowcharts used in the present invention illustrate the operations implemented according to some embodiments of the present invention. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without logical context relationships may be reversed or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present invention.

[0068] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present invention. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0069] The embodiments of the present invention provide an on-line monitoring and evaluation device and method for the energy efficiency of a ship seawater cooling system, which will be described separately below.

[0070] Figure 1 is a schematic structural diagram of an embodiment of the on-line monitoring and evaluation device for the energy efficiency of the ship seawater cooling system provided by the present invention. As Figure 1 shown, the on-line monitoring and evaluation device 10 for the energy efficiency of the ship seawater cooling system includes an information collection module 110 and an evaluation module 120;

[0071] The information collection module 110 is used to collect the current energy efficiency data of the ship seawater cooling system and upload the collected current energy efficiency data to the evaluation module 120;

[0072] The evaluation module 120 is used to evaluate the heat exchanger energy efficiency, seawater pump energy efficiency, and overall energy efficiency of the ship seawater cooling system according to the current energy efficiency data to obtain an evaluation result.

[0073] It should be noted that the ship seawater cooling system in the embodiments of the present invention includes, but is not limited to, heat exchangers and seawater pumps. The current energy efficiency data includes, but is not limited to, the current seawater inlet temperature value of the heat exchanger, the current fresh water inlet temperature value of the heat exchanger, the current fresh water outlet temperature value of the heat exchanger, the current seawater inlet flow value of the heat exchanger, the current fresh water inlet flow value of the heat exchanger, the current seawater outlet pressure value of the seawater pump, and the current power consumption of the seawater pump.

[0074] Compared with the prior art, the online monitoring and evaluation device 10 for the energy efficiency of the ship seawater cooling system provided in this embodiment collects the current energy efficiency data of the ship seawater cooling system through the information collection module 110, and then calculates the current energy efficiency data through the evaluation module 120 to obtain the energy efficiency evaluation result of the heat exchanger, the energy efficiency evaluation result of the seawater pump, and the overall energy efficiency evaluation result of the ship seawater cooling system. Thus, the user can repair or maintain the ship seawater cooling system according to the energy efficiency evaluation result, solving the technical problem that the reliability of the main engine, as well as the safety and economy of the ship, are reduced due to the too low energy efficiency value of the ship seawater cooling system.

[0075] In some embodiments of the present invention, the information collection module 110 includes a temperature collection unit 111, a flow collection unit 112, a pressure collection unit 113, and an electric energy collection unit 114;

[0076] The temperature collection unit 111 is used to collect the current seawater inlet temperature value, the current fresh water inlet temperature value, and the current fresh water outlet temperature value;

[0077] The flow collection unit 112 is used to collect the current seawater inlet flow value and the current fresh water inlet flow value;

[0078] The pressure collection unit 113 is used to collect the current seawater outlet pressure value;

[0079] The electric energy collection unit 114 is used to collect the current power consumption.

[0080] Among them, the temperature acquisition unit 112 includes but is not limited to multiple temperature sensors. By respectively arranging the multiple temperature sensors at the seawater inlet, fresh water inlet, and fresh water outlet of the heat exchanger, the current seawater inlet temperature value, the current fresh water inlet temperature value, and the fresh water outlet temperature value can be acquired; the flow rate acquisition unit 112 includes but is not limited to multiple flow meters. By respectively arranging the multiple flow meters at the seawater inlet of the heat exchanger and the fresh water inlet of the heat exchanger, the current seawater inlet flow rate value and the current fresh water inlet flow rate value can be acquired; the pressure acquisition unit 113 includes a pressure sensor, which is arranged at the total seawater outlet pipeline of the seawater pump to acquire the current seawater outlet pressure value; the electric energy acquisition unit 114 includes but is not limited to an electric energy meter, which is arranged at the power input end of the seawater pump to collect the current power consumption of the seawater pump.

[0081] It should be noted that in the embodiment of the present invention, the energy efficiency of the heat exchanger refers to the efficiency of the heat exchanger in transferring the heat of fresh water to seawater in the ship seawater cooling system. The energy efficiency of the seawater pump refers to the ratio of the total amount of seawater pumped by the seawater pump to its own total power consumption. The overall energy efficiency refers to the ratio of the total heat exchange amount of the ship seawater cooling system to its total power consumption. Users can accurately monitor and evaluate the working state of the heat exchanger, the working state of the seawater pump, and the working state of the entire system of the ship seawater cooling system through the energy efficiency of the heat exchanger, the energy efficiency of the seawater pump, and the overall energy efficiency.

[0082] It should be understood that multiple of the above-mentioned sensors and electric energy meters can be set at each location. When the main sensor fails, the standby sensor can be enabled immediately to prevent the failure of the online monitoring and evaluation device 10 for the energy efficiency of the ship seawater cooling system. At the same time, the data uploaded by multiple sensors can be compared to avoid data errors.

[0083] It should also be understood that in the embodiment of the present invention, the temperature acquisition unit 111, the flow rate acquisition unit 112, the pressure acquisition unit 113, and the electric energy acquisition unit 114 can be connected to the evaluation module 120 through a wire harness, and the acquired current energy efficiency data is transmitted to the evaluation module 120 through the wire harness, so that the evaluation module 120 can perform energy efficiency evaluation according to the energy efficiency data; in this embodiment, the energy efficiency data can also be transmitted through a wireless network, and this embodiment does not limit this.

[0084] In some embodiments of the present invention, the evaluation module 120 includes an energy efficiency index evaluation unit 121, a heat exchanger evaluation unit 122, and a seawater pump evaluation unit 123;

[0085] The energy efficiency index evaluation unit 121 is used to calculate the current energy efficiency index from the current energy efficiency data, and compare the current energy efficiency index with the corresponding historical energy efficiency index to obtain the overall energy efficiency evaluation result;

[0086] The heat exchanger evaluation unit 122 is used to calculate the current heat exchanger energy efficiency data according to a preset heat exchanger model to obtain the reference temperature value of the fresh water outlet, compare the current fresh water outlet temperature value with the reference temperature value of the fresh water outlet, and obtain the heat exchanger energy efficiency evaluation result;

[0087] The seawater pump evaluation unit 123 is used to calculate the current seawater pump energy efficiency data according to a preset seawater pump model to obtain the reference power consumption, compare the current power consumption with the reference power consumption, and obtain the seawater pump energy efficiency evaluation result.

[0088] Among them, in some embodiments of the present invention, the evaluation module 120 may be an industrial control computer for calculating and analyzing energy efficiency data; based on the current energy efficiency data and the corresponding historical energy efficiency data, the energy efficiency index evaluation unit 121 can calculate the current energy efficiency index and the historical energy efficiency index according to a preset energy efficiency index operation formula. The corresponding historical energy efficiency data refers to the historical energy efficiency data with the same or similar working conditions as the current working conditions of the ship's seawater cooling system. The historical energy efficiency index calculated through the historical energy efficiency data is the normal energy efficiency index corresponding to the working conditions. By comparing the current energy efficiency data with the historical energy efficiency index, it can be known whether the current energy efficiency index is normal.

[0089] It can be understood that in the embodiments of the present invention, the current heat exchanger energy efficiency data includes the current fresh water inlet temperature value, the current fresh water outlet temperature value, the current seawater inlet temperature value, the current seawater inlet flow value, and the current fresh water inlet flow value; the heat exchanger evaluation unit 122 can calculate the current heat exchanger energy efficiency data based on a preset heat exchanger model to obtain the reference temperature value of the fresh water outlet, compare the current fresh water outlet temperature value with the reference temperature value of the fresh water outlet. If the deviation between the current fresh water outlet temperature value and the historical fresh water outlet temperature value is not large, the heat exchanger energy efficiency is normal. If the deviation is too large, it indicates that the heat exchanger energy efficiency is abnormal.

[0090] In specific implementation, the preset heat exchanger model is a fresh water outlet temperature prediction model established based on LightGBM. The establishment process of the preset heat exchanger model includes: (1) data cleaning, arranging the historical heat exchanger data in ascending order according to the fresh water outlet temperature of the heat exchanger, filling in the missing data according to the difference method, adding the fresh water inlet flow value, fresh water inlet temperature value, seawater inlet temperature value, and seawater inlet flow value of the heat exchanger with the same fresh water outlet temperature respectively and taking the average value, and deleting the data in the historical heat exchanger data with a difference greater than 10% from the above average value; (2) normalizing the input features and dividing the training set and the test set. The formula is as follows:

[0091]

[0092] In the formula, represents The result after normalization, represents the minimum value of feature x, represents the maximum value of feature x; (3) Use the training set data to establish a freshwater outlet temperature prediction model based on LightGBM, determine the hyperparameters through an optimization algorithm, and use the random search algorithm and Bayesian optimization algorithm respectively to optimize the hyperparameter combination search space, compare the best hyperparameter combinations and the corresponding model progress obtained by the two hyperparameter optimization methods, and select the hyperparameter combination with the highest accuracy as the final parameter setting method for the freshwater outlet temperature prediction model of the heat exchanger; (4) Use the test set samples to test the freshwater outlet temperature prediction model, and the accuracy of the model is obtained through the coefficient of determination as follows:

[0093]

[0094] In the formula, represents the predicted value of the freshwater outlet temperature of the heat exchanger for the i th sample, represents the actual value of the freshwater outlet temperature of the heat exchanger for the i th sample, represents the average value of the freshwater outlet temperature of the heat exchanger.

[0095] It should also be understood that in the embodiments of the present invention, the current energy efficiency data of the seawater pump includes the current seawater inlet flow value, the current seawater outlet pressure value, and the current power consumption; the seawater pump evaluation unit 123 can calculate the reference power consumption based on the preset seawater pump model, compare the current power consumption with the reference power consumption, and then know whether the current power consumption is at the normal energy efficiency level. The current power consumption represents the current energy efficiency level of the seawater pump; the preset seawater pump model is a seawater pump power consumption prediction model established based on LightGBM, which can predict the total power consumption of all seawater pumps in the system according to the input seawater inlet flow value and seawater outlet pressure value. The establishment method of this model refers to the above-mentioned freshwater outlet temperature prediction model, and only the characteristic data used becomes the total power consumption of the seawater pump, the seawater main pipe outlet pressure value, and the flow value.

[0096] It should be noted that in the embodiments of the present invention, the number of heat exchangers and seawater pumps in the ship seawater cooling system is not limited and is determined according to the actual needs of the ship cooling system. The current energy efficiency data can be the total data in the ship seawater cooling system, or each heat exchanger and seawater pump has its corresponding energy efficiency data; for example, when there are multiple seawater pumps, the total power consumption of the seawater pumps can be obtained as the current power consumption for overall analysis of the seawater pumps, or the power consumption of a single seawater pump can be obtained for energy efficiency analysis of only this seawater pump. This embodiment does not limit this.

[0097] In an embodiment of the present invention, based on a temperature acquisition unit, a flow rate acquisition unit, a pressure acquisition unit, and an electric energy acquisition unit, the current energy efficiency data of the ship's seawater cooling system is acquired, and the acquired current energy efficiency data is uploaded to an energy efficiency index evaluation unit, a heat exchanger evaluation unit, and a seawater pump evaluation unit, so that the energy efficiency index evaluation unit, the heat exchanger evaluation unit, and the seawater pump evaluation unit can accurately evaluate the overall energy efficiency, the heat exchanger energy efficiency, and the seawater pump energy efficiency of the ship's seawater cooling system according to the current energy efficiency data. Thus, the user can repair or maintain the ship's seawater cooling system according to the energy efficiency evaluation result, solving the technical problem of the reduction of the main engine reliability, the ship's safety, and economy due to the too low energy efficiency value of the ship's seawater cooling system.

[0098] On the other hand, based on the ship's seawater cooling system energy efficiency online monitoring and evaluation device, correspondingly, an embodiment of the present invention further provides a ship's seawater cooling system energy efficiency online monitoring and evaluation method, which is applicable to the ship's seawater cooling monitoring and evaluation device described in any of the above embodiments; as Figure 2 shown, the ship's seawater cooling system energy efficiency online monitoring and evaluation method includes the following steps:

[0099] S210. Obtain the current energy efficiency data of the ship's seawater cooling system based on the information acquisition module;

[0100] S220. According to the current energy efficiency data, use the evaluation module to evaluate the heat exchanger energy efficiency, the seawater pump energy efficiency, and the overall energy efficiency of the ship's seawater cooling system to obtain an evaluation result.

[0101] It should be noted that the ship's seawater cooling system in the embodiment of the present invention includes a heat exchanger and a seawater pump, and the current energy efficiency data includes the current seawater inlet temperature value of the heat exchanger, the current fresh water inlet temperature value of the heat exchanger, the current fresh water outlet temperature value of the heat exchanger, the current seawater inlet flow rate value of the heat exchanger, the current fresh water inlet flow rate value of the heat exchanger, the current seawater outlet pressure value of the seawater pump, and the current power consumption of the seawater pump. The heat exchanger energy efficiency refers to the efficiency of the heat exchanger transferring the heat of the fresh water to the seawater, the seawater pump energy efficiency refers to the ratio of the total amount of seawater pumped by the seawater pump to its own total power consumption, and the overall energy efficiency refers to the ratio of the total heat exchange amount of the ship's seawater cooling system to its total power consumption.

[0102] It should be understood that the execution subject of this embodiment is the ship's seawater cooling system energy efficiency online monitoring and evaluation device, which may be composed of an industrial control computer and peripheral electronic devices. The peripheral electronic devices may also include sensors for obtaining the current energy efficiency data. The industrial control computer calculates and analyzes the current energy efficiency data through a computer program to obtain an evaluation result, and displays the energy efficiency data and the evaluation result to the user in real time through a display panel.

[0103] Compared with the prior art, the online monitoring and evaluation method for the energy efficiency of the ship's seawater cooling system provided by the embodiment of the present invention obtains energy efficiency data in real time, calculates and analyzes the energy efficiency data, obtains the real-time energy efficiency evaluation result of the ship's seawater cooling system, and then repairs or maintains the ship's seawater cooling system according to the energy efficiency evaluation result, ensuring the reliability of the main engine and the safety and economy of the ship.

[0104] In some embodiments of the present invention, as Figure 3 shown, step S210 includes:

[0105] S310. Obtain the current seawater inlet temperature value, the current fresh water inlet temperature value, and the current fresh water outlet temperature value based on the temperature acquisition unit;

[0106] S320. Obtain the current seawater inlet flow value and the current fresh water inlet flow value based on the flow rate acquisition unit;

[0107] S330. Obtain the current seawater outlet pressure value based on the pressure acquisition unit;

[0108] S340. Obtain the current power consumption based on the electric energy acquisition unit.

[0109] It can be understood that in this embodiment, the temperature acquisition unit may be a temperature sensor, the flow rate acquisition unit may be a flow meter, the pressure acquisition unit may be a pressure sensor, and the electric energy acquisition unit may be an electric energy meter. The above-mentioned sensor devices may be replaced by other electronic components, and this embodiment does not limit this.

[0110] In some embodiments of the present invention, as Figure 4 shown, step S220 includes:

[0111] S410. Calculate according to the current energy efficiency data to obtain the current energy efficiency index;

[0112] S420. Compare the current energy efficiency index with the corresponding historical energy efficiency index to obtain the overall energy efficiency evaluation result;

[0113] S430. Calculate the current heat exchanger energy efficiency data using a preset heat exchanger model to obtain the reference temperature value of the fresh water outlet, and compare the current fresh water outlet temperature value with the reference temperature value of the fresh water outlet to obtain the heat exchanger energy efficiency evaluation result;

[0114] S440. Calculate the current seawater pump energy efficiency data using a preset seawater pump model to obtain the reference power consumption, and compare the current power consumption with the reference power consumption to obtain the seawater pump energy efficiency evaluation result.

[0115] Among them, the calculation of the energy efficiency index includes obtaining the energy efficiency index formula and substituting the current energy efficiency data into the energy efficiency index formula to obtain the current energy efficiency index. In this embodiment, the energy efficiency index formula uses the total power consumption of the seawater pumps in the ship's seawater cooling system as the total input of the system and the heat transfer amount of the heat exchanger as the useful power of the system. Then, the energy efficiency index of the ship's seawater cooling system is:

[0116] ;

[0117] In the formula, is the energy efficiency index; is the heat transfer amount of the ship's seawater cooling system through the heat exchanger; is the total power consumption of the seawater pumps; The calculation formula of

[0118] is as follows:

[0119] In the formula, is the specific heat capacity of fresh water; is the mass flow rate of fresh water flowing through the heat exchanger; is the inlet temperature of fresh water flowing through the heat exchanger; is the outlet temperature of fresh water flowing through the heat exchanger. Therefore, the final calculation formula of the energy efficiency index is:

[0120] ;

[0121] By using the above energy efficiency index formula, the energy efficiency index can be obtained to accurately evaluate the overall energy efficiency of the ship's seawater cooling system.

[0122] It should be understood that in the embodiments of the present invention, not only the overall energy efficiency of the ship's seawater cooling system is evaluated by using the energy efficiency index, but also the energy efficiency of the heat exchanger and the seawater pumps is evaluated, so that the user can accurately find the reason for the abnormal overall energy efficiency according to the energy efficiency evaluation results and perform corresponding repairs and maintenance.

[0123] In some embodiments of the present invention, as Figure 5 shown, step S420 includes:

[0124] S510. Screen out the historical system condition data corresponding to the current system condition from the system database according to the current seawater inlet temperature value and the current power consumption;

[0125] S520. Calculate the historical system condition data by using the energy efficiency index formula to obtain the historical energy efficiency index;

[0126] S530. Calculate the current energy efficiency index and the historical energy efficiency index to obtain the index deviation value;

[0127] S540. When the index deviation value is greater than the preset index deviation threshold, the obtained overall energy efficiency evaluation result is that the system energy efficiency decreases;

[0128] S550. When the index deviation value is less than the preset index deviation threshold, the obtained overall energy efficiency evaluation result is that the system energy efficiency is normal.

[0129] Among them, the corresponding historical system operating condition data refers to the historical system operating condition data with similar current seawater inlet temperature value and current power consumption. Then, the historical energy efficiency index with similar operating conditions is calculated using the energy efficiency index formula, and this historical energy efficiency index is used as the normal system energy efficiency reference value to analyze the current system energy efficiency and obtain the system energy efficiency evaluation result.

[0130] In some embodiments of the present invention, as Figure 6 shown, step S430 includes:

[0131] S610. Input the current fresh water inlet temperature value, current seawater inlet temperature value, current seawater inlet flow rate value, and current fresh water inlet flow rate value into a preset heat exchanger model, and perform calculations based on the preset heat exchanger model to obtain the reference temperature value of the fresh water outlet;

[0132] S620. Calculate the difference between the current fresh water outlet temperature value and the reference temperature value of the fresh water outlet to obtain the temperature deviation value;

[0133] S630. When the temperature deviation value is greater than the preset temperature deviation threshold, the obtained heat exchanger energy efficiency evaluation result is that the heat exchanger energy efficiency decreases;

[0134] S640. When the temperature deviation value is less than the preset temperature deviation threshold, the obtained heat exchanger energy efficiency evaluation result is that the heat exchanger energy efficiency is normal.

[0135] It can be understood that the preset heat exchanger model is a heat exchanger fresh water outlet temperature prediction model, which is used to predict the fresh water outlet temperature value based on the current heat exchanger energy efficiency data. The predicted temperature value is the fresh water outlet temperature value when the heat exchanger energy efficiency is normal. Therefore, this predicted temperature is the reference temperature value of the fresh water outlet; when it is known that the system energy efficiency is abnormal, it is necessary to specifically analyze the abnormal device. Therefore, it is necessary to analyze the energy efficiency of the heat exchanger; in the embodiments of the present invention, the current fresh water inlet temperature value, current seawater inlet temperature value, current seawater inlet flow rate value, and current fresh water inlet flow rate value are used as the current operating condition data. Based on this current operating condition data, the reference temperature value of the fresh water outlet is calculated using the preset heat exchanger model. Compare the current fresh water outlet temperature value with the accurate temperature value of the fresh water outlet, evaluate the energy efficiency of the heat exchanger according to the temperature deviation value, and display the evaluation result to the user through the display panel.

[0136] In some embodiments of the present invention, as Figure 7As shown, step S440 includes:

[0137] S710. Input the current seawater inlet flow rate value and the current seawater outlet pressure value into a preset seawater pump model, and calculate based on the preset seawater pump model to obtain the reference power consumption.

[0138] S720. Calculate the difference between the current power consumption and the reference power consumption to obtain the power consumption deviation value.

[0139] S730. When the power consumption deviation value is greater than the preset power consumption deviation threshold, the obtained energy efficiency evaluation result of the seawater pump is that the energy efficiency of the seawater pump has decreased.

[0140] S740. When the power consumption deviation value is less than the preset power consumption deviation threshold, the obtained energy efficiency evaluation result of the seawater pump is that the energy efficiency of the seawater pump is normal.

[0141] It should be noted that the preset seawater pump model is a power consumption prediction model for the seawater pump. This model can predict the power consumption of the seawater pump when the energy efficiency is normal (i.e., the reference power consumption) according to the seawater inlet flow rate value and the seawater outlet pressure value. Based on this model and the current energy efficiency data of the seawater pump, the reference power consumption of the current seawater pump can be obtained. By comparing this reference power consumption with the current actual power consumption, the power consumption deviation value can be obtained. Based on this power consumption deviation value, the energy efficiency of the seawater pump can be evaluated, and the evaluation result can be displayed to the user through a display panel.

[0142] It should be noted that: the steps in the method in the above embodiments can be increased or extended according to each module or unit in the ship seawater cooling system monitoring energy efficiency evaluation device. For specific details, please refer to the description in the embodiments of the ship seawater cooling system energy efficiency online monitoring and evaluation device, which will not be elaborated here.

[0143] The ship seawater cooling system energy efficiency online monitoring and evaluation device and method provided by the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An on-line monitoring and evaluation device for the energy efficiency of a ship's seawater cooling system, characterized in that, it includes an information collection module and an evaluation module; the information collection module is used to collect the current energy efficiency data of the ship's seawater cooling system and upload the collected current energy efficiency data to the evaluation module; the evaluation module is used to evaluate the energy efficiency of the heat exchanger, the energy efficiency of the seawater pump and the overall energy efficiency of the ship's seawater cooling system according to the current energy efficiency data, and obtain an evaluation result; wherein, the ship's seawater cooling system includes a heat exchanger and a seawater pump, the current energy efficiency data includes the current seawater inlet temperature value of the heat exchanger, the current fresh water inlet temperature value of the heat exchanger, the current fresh water outlet temperature value of the heat exchanger, the current seawater inlet flow value of the heat exchanger, the current fresh water inlet flow value of the heat exchanger, the current seawater outlet pressure value of the seawater pump, and the current power consumption of the seawater pump. The energy efficiency of the heat exchanger refers to the efficiency of the heat exchanger transferring the heat of fresh water to seawater. The energy efficiency of the seawater pump refers to the ratio of the total amount of seawater pumped by the seawater pump to the total power consumption of the seawater pump. The overall energy efficiency refers to the ratio of the total heat exchange of the ship's seawater cooling system to the total power consumption of the ship's seawater cooling system.

2. The on-line monitoring and evaluation device for the energy efficiency of a ship's seawater cooling system according to claim 1, characterized in that, the information collection module includes a temperature collection unit, a flow collection unit, a pressure collection unit and an electric energy collection unit; the temperature collection unit is used to collect the current seawater inlet temperature value, the current fresh water inlet temperature value and the current fresh water outlet temperature value; the flow collection unit is used to collect the current seawater inlet flow value and the current fresh water inlet flow value; the pressure collection unit is used to collect the current seawater outlet pressure value; the electric energy collection unit is used to collect the current power consumption.

3. The on-line monitoring and evaluation device for the energy efficiency of a ship's seawater cooling system according to claim 2, characterized in that, the evaluation module includes an energy efficiency index evaluation unit, a heat exchanger evaluation unit and a seawater pump evaluation unit; the energy efficiency index evaluation unit is used to calculate the current energy efficiency index from the current energy efficiency data, and compare the current energy efficiency index with the corresponding historical energy efficiency index to obtain an overall energy efficiency evaluation result; the heat exchanger evaluation unit is used to calculate the reference temperature value of the fresh water outlet according to a preset heat exchanger model for the current heat exchanger energy efficiency data, and compare the current fresh water outlet temperature value with the reference temperature value of the fresh water outlet to obtain a heat exchanger energy efficiency evaluation result; the seawater pump evaluation unit is used to calculate the reference power consumption according to a preset seawater pump model for the current seawater pump energy efficiency data, and compare the current power consumption with the reference power consumption to obtain a seawater pump energy efficiency evaluation result; Among them, the current energy efficiency data of the heat exchanger includes the current fresh water inlet temperature value, the current fresh water outlet temperature value, the current sea water inlet temperature value, the current sea water inlet flow value, and the current fresh water inlet flow value, and the current energy efficiency data of the sea water pump includes the current sea water inlet flow value, the current sea water outlet pressure value, and the current power consumption.

4. An on-line monitoring and evaluation method for the energy efficiency of a ship's sea water cooling system, which is applied to the on-line monitoring and evaluation device for the energy efficiency of a ship's sea water cooling system according to any one of claims 1-3. It is characterized in that The on-line monitoring and evaluation method for the energy efficiency of the ship's sea water cooling system includes the following steps: Obtain the current energy efficiency data of the ship's sea water cooling system based on the information collection module; According to the current energy efficiency data, use the evaluation module to evaluate the energy efficiency of the heat exchanger, the energy efficiency of the sea water pump, and the overall energy efficiency of the ship's sea water cooling system to obtain an evaluation result; Among them, the ship's sea water cooling system includes a heat exchanger and a sea water pump. The current energy efficiency data includes the current sea water inlet temperature value of the heat exchanger, the current fresh water inlet temperature value of the heat exchanger, the current fresh water outlet temperature value of the heat exchanger, the current sea water inlet flow value of the heat exchanger, the current fresh water inlet flow value of the heat exchanger, the current sea water outlet pressure value of the sea water pump, and the current power consumption of the sea water pump. The energy efficiency of the heat exchanger refers to the efficiency of the heat exchanger transferring the heat of fresh water to sea water. The energy efficiency of the sea water pump refers to the ratio of the total amount of sea water pumped by the sea water pump to the total power consumption of the sea water pump. The overall energy efficiency refers to the ratio of the total heat exchange of the ship's sea water cooling system to the total power consumption of the ship's sea water cooling system.

5. The on-line monitoring and evaluation method for the energy efficiency of a ship's sea water cooling system according to claim 4. It is characterized in that The step of obtaining the current energy efficiency data of the ship's sea water cooling system based on the information collection module includes: Obtain the current sea water inlet temperature value, the current fresh water inlet temperature value, and the current fresh water outlet temperature value based on the temperature collection unit; Obtain the current sea water inlet flow value and the current fresh water inlet flow value based on the flow collection unit; Obtain the current sea water outlet pressure value based on the pressure collection unit; Obtain the current power consumption based on the electric energy collection unit.

6. The on-line monitoring and evaluation method for the energy efficiency of a ship's sea water cooling system according to claim 5. It is characterized in that The step of using the evaluation module to evaluate the energy efficiency of the heat exchanger, the energy efficiency of the sea water pump, and the overall energy efficiency of the ship's sea water cooling system according to the current energy efficiency data includes: Calculate according to the current energy efficiency data to obtain the current energy efficiency index; Compare the current energy efficiency index with the corresponding historical energy efficiency index to obtain the overall energy efficiency evaluation result; Use a preset heat exchanger model to calculate the current heat exchanger energy efficiency data to obtain the reference temperature value of the fresh water outlet, and compare the current fresh water outlet temperature value with the reference temperature value of the fresh water outlet to obtain the heat exchanger energy efficiency evaluation result; Calculate the energy efficiency data of the current seawater pump using a preset seawater pump model to obtain the benchmark power consumption, and compare the current power consumption with the benchmark power consumption to obtain the energy efficiency evaluation result of the seawater pump; Among them, the current heat exchanger energy efficiency data includes the current fresh water inlet temperature value, the current fresh water outlet temperature value, the current seawater inlet temperature value, the current seawater inlet flow value, and the current fresh water inlet flow value, and the current seawater pump energy efficiency data includes the current seawater inlet flow value, the current seawater outlet pressure value, and the current power consumption.

7. The online monitoring and evaluation method for the energy efficiency of a ship's seawater cooling system according to claim 6, characterized in that, The step of calculating the current energy efficiency index according to the current energy efficiency data includes: Obtain the energy efficiency index formula; Calculate the current energy efficiency data using the energy efficiency index formula to obtain the current energy efficiency index; Among them, the energy efficiency index formula includes: In the formula, is the energy efficiency index; is the specific heat capacity of fresh water; is the mass flow rate of fresh water flowing through the heat exchanger; is the outlet temperature of fresh water flowing through the heat exchanger; is the inlet temperature of fresh water flowing through the heat exchanger.

8. The online monitoring and evaluation method for the energy efficiency of a ship's seawater cooling system according to claim 7, characterized in that, The step of comparing the current energy efficiency index with the corresponding historical energy efficiency index to obtain the overall energy efficiency evaluation result includes: Screen the historical system condition data corresponding to the current system condition from the system database according to the current seawater inlet temperature value and the current power consumption; Calculate the historical system condition data using the energy efficiency index formula to obtain the historical energy efficiency index; Calculate the current energy efficiency index and the historical energy efficiency index to obtain an index deviation value; When the index deviation value is greater than the preset index deviation threshold, the obtained overall energy efficiency evaluation result is that the system energy efficiency has decreased; When the index deviation value is less than the preset index deviation threshold, the obtained overall energy efficiency evaluation result is that the system energy efficiency is normal.

9. The online monitoring and evaluation method for the energy efficiency of a ship's seawater cooling system according to claim 6, characterized in that, The step of calculating the current heat exchanger energy efficiency data using a preset heat exchanger model to obtain the reference fresh water outlet temperature value, and comparing the current fresh water outlet temperature value with the reference fresh water outlet temperature value to obtain the heat exchanger energy efficiency evaluation result includes: Input the current fresh water inlet temperature value, the current seawater inlet temperature value, the current seawater inlet flow value, and the current fresh water inlet flow value into the preset heat exchanger model, and calculate based on the preset heat exchanger model to obtain the reference fresh water outlet temperature value; Calculate the difference between the current fresh water outlet temperature value and the reference fresh water outlet temperature value to obtain a temperature deviation value; When the temperature deviation value is greater than the preset temperature deviation threshold, the obtained heat exchanger energy efficiency evaluation result is that the heat exchanger energy efficiency has decreased; When the temperature deviation value is less than the preset temperature deviation threshold, the obtained heat exchanger energy efficiency evaluation result is that the heat exchanger energy efficiency is normal.

10. The online monitoring and evaluation method for the energy efficiency of a ship's seawater cooling system according to claim 6, characterized in that, The steps of calculating the benchmark power consumption by using the preset seawater pump model for the current seawater pump energy efficiency data, and comparing the current power consumption with the benchmark power consumption to obtain the seawater pump energy efficiency evaluation result include: Input the current seawater inlet flow value and the current seawater outlet pressure value into the preset seawater pump model, and calculate based on the preset seawater pump model to obtain the benchmark power consumption; Perform a difference calculation on the current power consumption and the benchmark power consumption to obtain a power consumption deviation value; When the power consumption deviation value is greater than the preset power consumption deviation threshold, the obtained seawater pump energy efficiency evaluation result is that the seawater pump energy efficiency has decreased; When the power consumption deviation value is less than the preset power consumption deviation threshold, the obtained seawater pump energy efficiency evaluation result is that the seawater pump energy efficiency is normal.

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