阅读说明：本技术 船舶集中冷却系统的运行方法及运行控制装置 (Operation method and operation control device of ship centralized cooling system ) 是由 魏志国 柯汉兵 柯志武 肖颀 赵振兴 李勇 李邦明 劳星胜 王瑞奇 邹振海 黄崇 于 2021-07-23 设计创作，主要内容包括：本发明提供一种船舶集中冷却系统的运行方法及运行控制装置,其中,所述集中冷却系统包括淡水回路,所述淡水回路用于流经热源用户和集中冷却器,且所述淡水回路上设有淡水泵,所述船舶集中冷却系统的运行方法包括：设定所述淡水泵的实际运转速度；获取热源用户热负荷的变化；根据所述淡水泵的实际运转速度以及所述热源用户热负荷的变化调节所述淡水回路内的纳米颗粒浓度,以满足所述热源用户热负荷需求。该运行方法,简单、操作方便,不需要改变系统内设备例如淡水泵的运行即可实现淡水回路内负荷的变化,不仅降低了因负荷变化对设备运行工况的影响,也提高了系统的效率,降低噪声,使集中冷却系统高效、安静、可靠的运行。(The invention provides an operation method and an operation control device of a ship centralized cooling system, wherein the centralized cooling system comprises a fresh water loop, the fresh water loop is used for flowing through a heat source user and a centralized cooler, a fresh water pump is arranged on the fresh water loop, and the operation method of the ship centralized cooling system comprises the following steps: setting the actual running speed of the fresh water pump; acquiring the change of the heat load of a heat source user; and adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user. The operation method is simple and convenient to operate, changes of the load in the fresh water loop can be realized without changing the operation of equipment in the system, such as a fresh water pump, the influence of the load changes on the operation condition of the equipment is reduced, the efficiency of the system is improved, the noise is reduced, and the concentrated cooling system can operate efficiently, quietly and reliably.)

1. An operation method of a centralized cooling system of a ship is characterized in that the centralized cooling system comprises a fresh water loop, the fresh water loop is used for flowing through a heat source user and a centralized cooler, a fresh water pump is arranged on the fresh water loop, and the operation method of the centralized cooling system of the ship comprises the following steps:

setting the actual running speed of the fresh water pump;

acquiring the change of the heat load of a heat source user;

and adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

2. The method according to claim 1, wherein the setting of the actual operating speed of the fresh water pump specifically includes:

determining the optimal running speed of the fresh water pump according to the performance of the fresh water pump;

and setting the actual running speed of the fresh water pump according to the running state of the ship and the optimal running speed.

3. The method of operating a concentrated cooling system for a ship according to claim 2, wherein determining an optimal operating speed of the fresh water pump comprises:

acquiring vibration acceleration levels of the fresh water pump at different running speeds;

and determining the optimal running speed of the fresh water pump according to the vibration acceleration levels of the fresh water pump at different running speeds.

4. The method of claim 1, wherein adjusting the concentration of nanoparticles in the fresh water circuit according to the change in the heat load of the heat source user comprises:

when the heat load of the heat source user is increased, injecting nanoparticles into the fresh water loop to increase the concentration of the nanoparticles in the fresh water loop;

and when the heat load of the heat source user is reduced, separating and recovering the nano particles in the fresh water loop, and reducing the concentration of the nano particles in the fresh water loop.

5. The method of operating the concentrated cooling system for ships according to any one of claims 1 to 4, wherein adjusting the concentration of nanoparticles in the fresh water circuit according to the change in the heat load of the heat source user further comprises:

acquiring the corresponding relation between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system;

determining the target concentration of the nanoparticles in the fresh water loop according to the change of the heat load of the heat source user and the corresponding relation, so that the cooling load of the centralized cooling system is adaptive to the heat load of the heat source user under the target concentration of the nanoparticles;

and adjusting the concentration of the nanoparticles in the fresh water loop according to the target concentration of the nanoparticles.

6. The operation method of the concentrated cooling system for ships according to claim 5, wherein the obtaining of the correspondence between the concentration of nanoparticles in the fresh water circuit and the cooling load of the concentrated cooling system specifically comprises:

when the running speed of the fresh water pump is kept constant, cooling loads corresponding to different nanoparticle concentrations in the fresh water loop are obtained according to temperature change information in the fresh water loop;

and acquiring the relation between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system at the running speed of the fresh water pump.

7. The method of operating the concentrated cooling system for ships according to claim 6, wherein obtaining the correspondence between the concentration of nanoparticles in the fresh water circuit and the cooling load of the concentrated cooling system further comprises:

setting a plurality of preset running speeds of the fresh water pump;

and acquiring corresponding relations between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system at a plurality of preset operating speeds of the fresh water pump.

8. An operation control device of a ship centralized cooling system is characterized in that,

the setting module is used for setting the actual running speed of the fresh water pump;

the acquisition module is used for acquiring the change of the heat load of the heat source user;

and the adjusting module is used for adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

9. The operation control device of the concentrated cooling system for ships according to claim 8, further comprising a concentration detection device for detecting the concentration of nanoparticles in the fresh water circuit and a temperature monitoring assembly for monitoring the temperature in the fresh water circuit.

10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the method of operating a centralized cooling system for a ship according to any one of claims 1 to 7.

Technical Field

The invention relates to the technical field of cooling systems, in particular to an operation method and an operation control device of a ship centralized cooling system.

Background

The navigation of a marine vessel requires a plurality of devices such as a main engine, a diesel engine, and an electric motor to be operated in cooperation, thereby inevitably causing heat generation. In order to ensure stable operation of each device, it is necessary to cool it, and therefore a cooling system for comprehensively managing the cooling function is installed in the ship.

In the prior art, the cooling system of the ship uses fresh water due to the corrosion problem of the device, and the fresh water needs to be used after being properly cooled through heat exchange with seawater. When the heat load of a user changes, the operation condition of the fresh water pump is usually selected to be changed to adjust the heat load, so that the operation of the fresh water pump deviates from a design working condition point, and the problems of low equipment energy efficiency, increased vibration noise and influence on the efficient, quiet and reliable operation of a ship cooling system exist.

Disclosure of Invention

The invention provides an operation method and an operation control device of a ship centralized cooling system, which are used for solving the problems that in the prior art, the operation of a fresh water pump deviates from a design working condition point due to the fact that the heat load is adjusted by changing the operation working condition of the fresh water pump, the energy efficiency of equipment is reduced, and vibration noise is increased.

The invention provides an operation method of a ship centralized cooling system, wherein the ship centralized cooling system comprises a fresh water loop, the fresh water loop is used for flowing through a heat source user and a centralized cooler, a fresh water pump is arranged on the fresh water loop, and the operation method of the ship centralized cooling system comprises the following steps: setting the actual running speed of the fresh water pump; acquiring the change of the heat load of a heat source user; and adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

According to the operation method of the concentrated cooling system for the ship provided by the invention, the step of setting the actual operation speed of the fresh water pump specifically comprises the following steps: determining the optimal running speed of the fresh water pump according to the performance of the fresh water pump; and setting the actual running speed of the fresh water pump according to the running state of the ship and the optimal running speed.

According to the operation method of the concentrated cooling system of the ship, the step of determining the optimal operation speed of the fresh water pump comprises the following steps: acquiring vibration acceleration levels of the fresh water pump at different running speeds; and determining the optimal running speed of the fresh water pump according to the vibration acceleration levels of the fresh water pump at different running speeds.

According to the operation method of the concentrated cooling system of the ship, the adjusting of the concentration of the nanoparticles in the fresh water loop according to the change of the heat load of the heat source user comprises the following steps: when the heat load of the heat source user is increased, injecting nanoparticles into the fresh water loop to increase the concentration of the nanoparticles in the fresh water loop; and when the heat load of the heat source user is reduced, separating and recovering the nano particles in the fresh water loop, and reducing the concentration of the nano particles in the fresh water loop.

According to the operation method of the concentrated cooling system of the ship provided by the invention, the adjusting the concentration of the nanoparticles in the fresh water loop according to the change of the heat load of the heat source user further comprises the following steps: acquiring the corresponding relation between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system; determining the target concentration of the nanoparticles in the fresh water loop according to the change of the heat load of the heat source user and the corresponding relation, so that the cooling load of the centralized cooling system is adaptive to the heat load of the heat source user under the target concentration of the nanoparticles; and adjusting the concentration of the nanoparticles in the fresh water loop according to the target concentration of the nanoparticles.

According to the operation method of the ship centralized cooling system provided by the invention, the step of obtaining the corresponding relation between the concentration of the nanoparticles in the fresh water loop and the cooling load of the centralized cooling system specifically comprises the following steps: when the running speed of the fresh water pump is kept constant, cooling loads corresponding to different nanoparticle concentrations in the fresh water loop are obtained according to temperature change information in the fresh water loop; and acquiring the relation between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system at the running speed of the fresh water pump.

According to the operation method of the concentrated cooling system of the ship provided by the invention, the step of obtaining the corresponding relation between the concentration of the nanoparticles in the fresh water loop and the cooling load of the concentrated cooling system further comprises the following steps: setting a plurality of preset running speeds of the fresh water pump; and acquiring corresponding relations between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system at a plurality of preset operating speeds of the fresh water pump.

The invention also provides an operation control device of the ship centralized cooling system, which comprises a setting module, a control module and a control module, wherein the setting module is used for setting the actual running speed of the fresh water pump; the acquisition module is used for acquiring the change of the heat load of the heat source user; and the adjusting module is used for adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

The operation control device of the ship centralized cooling system further comprises a concentration detection device and a temperature monitoring assembly, wherein the concentration detection device is used for detecting the concentration of nanoparticles in the fresh water loop, and the temperature monitoring assembly is used for monitoring the temperature in the fresh water loop.

The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the operation method of the ship centralized cooling system.

According to the operation method and the operation control device of the ship centralized cooling system, the change of the heat load of the heat source user is obtained by setting the actual operation speed of the fresh water pump, and when the heat load of the heat source user changes under the actual operation speed of the fresh water pump, the concentration of nanoparticles in the fresh water loop is increased or reduced, the conductivity and the heat transfer coefficient of fresh water in the fresh water loop are changed, so that the cooling load of the centralized cooling system is increased or reduced, the cooling load of the centralized cooling system corresponds to the heat load of the heat source user, and the requirement of the heat load of the heat source user is met. The operation method of the concentrated cooling system is simple and convenient to operate, and the change of the load in the fresh water loop can be realized without changing the operation of equipment in the system, such as a fresh water pump, so that the influence of the change of the load on the operation condition of the equipment is reduced, the efficiency of the system is improved, the noise is reduced, and the concentrated cooling system can operate efficiently, quietly and reliably.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow diagram of a method for operating a centralized cooling system for a ship according to the present invention;

FIG. 2 is a schematic diagram of the relationship between the operating speed and the vibration acceleration level of the fresh water pump provided by the present invention;

FIG. 3 is a schematic diagram of the relationship between the cooling load and the concentration of nanoparticles at different operating speeds of the fresh water pump provided by the present invention;

fig. 4 is a schematic structural diagram of an electronic device provided in the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following describes an operation method and an operation control device of a centralized cooling system for a ship according to the present invention with reference to fig. 1 to 4.

Referring to fig. 1, the present embodiment provides an operation method of a centralized cooling system of a ship, where the centralized cooling system includes a fresh water loop, the fresh water loop is used for flowing through a heat source user and a centralized cooler, and a fresh water pump is disposed on the fresh water loop, and the operation method of the centralized cooling system of the ship includes: setting the actual running speed of the fresh water pump; acquiring the change of the heat load of a heat source user; and adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

The centralized cooling system provided by the embodiment comprises a fresh water loop, wherein the fresh water loop is a pipeline for circulating fresh water between a heat source user and a centralized cooler, namely fresh water in the fresh water loop flows through the centralized cooler to enter the heat source user after being cooled, and is cooled by the centralized cooler after heat exchange with the heat source user is finished; furthermore, a fresh water pump is arranged on the fresh water loop, and the fresh water pump drives the fresh water on the two sides of the centralized cooler to circularly flow in the fresh water loop by utilizing the supercharging principle.

The operation method of the ship centralized cooling system provided by the embodiment comprises the steps of setting the actual operation speed of the fresh water pump, specifically, the fresh water pump has different operation speeds, and the operation speeds of the fresh water pump in the centralized cooling system are different under different conditions, so that the actual operation speed of the fresh water pump can be set according to the actual conditions; during the operation of the centralized cooling system, the heat load of the heat source users is changed, that is, the heat load of the heat source users may be kept constant, or may be suddenly increased or suddenly decreased to obtain the heat load of the heat source users.

Further, the concentration of the nanoparticles in the fresh water loop is adjusted according to the actual operating speed of the fresh water pump and the change of the heat load of the heat source user, namely the actual operating speed of the fresh water pump is kept constant, and when the heat load of the heat source user is increased or decreased, the concentration of the nanoparticles in the fresh water loop is adjusted, so that the conductivity and the heat transfer coefficient of the fresh water in the fresh water loop can be changed, the cooling load of the centralized cooling system can be increased or decreased, and the cooling load of the centralized cooling system can meet the heat load requirement of the heat source user.

In the embodiment, the change of the heat load of the heat source user is obtained by setting the actual operating speed of the fresh water pump, and under the actual operating speed of the fresh water pump, when the heat load of the heat source user changes, the concentration of nanoparticles in the fresh water loop is increased or reduced, the conductivity and the heat transfer coefficient of the fresh water in the fresh water loop are changed, and further the cooling load of the centralized cooling system is increased or reduced, so that the cooling load of the centralized cooling system corresponds to the heat load of the heat source user, and the heat load requirement of the heat source user is met. The operation method of the concentrated cooling system is simple and convenient to operate, and the change of the load in the fresh water loop can be realized without changing the operation of equipment in the system, such as a fresh water pump, so that the influence of the change of the load on the operation condition of the equipment is reduced, the efficiency of the system is improved, the noise is reduced, and the concentrated cooling system can operate efficiently, quietly and reliably.

According to the method, the change of the heat load of the heat source user is obtained under the condition that the actual running speed of the fresh water pump is set, the concentration of the nanoparticles in the fresh water loop is adjusted according to the change information of the heat load, the requirement of the heat source user on the cooling load is met, and then the heat exchange of the heat source user is achieved.

Further, in the operation method of the concentrated ship cooling system provided in this embodiment, the setting of the actual operating speed of the fresh water pump specifically includes: determining the optimal running speed of the fresh water pump according to the performance of the fresh water pump; and setting the actual running speed of the fresh water pump according to the running state of the ship and the optimal running speed.

Different fresh water pumps have different performances. The user can determine the optimal running speed of the fresh water pump according to the performance of the fresh water pump; further, in the actual operation process of the concentrated cooling system, the optimal operation speed of the fresh water pump is not necessarily the actual operation speed, and the actual operation speed of the fresh water pump is set according to the operation state of the ship and the optimal operation speed of the fresh water pump; specifically, the actual operating speed of the fresh water pump is equal to or approaches the optimal operating speed, and resonance of the concentrated cooling system and the ship can be avoided at the actual operating speed of the fresh water pump.

That is, the actual operating speed of the fresh water pump is selected within a set range around the optimal operating speed of the fresh water pump in accordance with the operating state of the ship, while avoiding resonance with the ship. The setting range of the optimal operation speed of the fresh water pump is the operation speed close to the optimal operation speed, namely the maximum value is larger than the optimal operation speed, and the minimum value is smaller than the optimal operation speed. That is, the actual operating speed of the fresh-water pump may be the optimum operating speed or may be another operating speed within the set range of the optimum operating speed, depending on the operating state of the ship, for example, the actual operating speed of the fresh-water pump may be greater than the optimum operating speed or less than the optimum operating speed or equal to the optimum operating speed within the set range of the optimum operating speed.

Further, on the basis of the above-described embodiment, setting the actual operation speed of the fresh water pump further includes: and after the ship runs for a period of time, determining the optimal running speed of the fresh water pump again, and setting the actual running speed again according to the running state of the ship and the optimal running speed.

The ship and the fresh water pump have certain service lives, after the ship runs for a period of time, the running parameters of the ship and the fresh water pump change, and at the moment, in order to ensure that the concentrated cooling system keeps efficient and reliable running, the actual running speed of the fresh water pump needs to be set again. Specifically, after the ship runs for a period of time, the optimal running speed of the fresh water pump at the moment can be determined again; according to the running state of the ship, the actual running speed of the fresh water pump is set within the range of the optimal running speed of the fresh water pump at the moment, and the fresh water pump runs according to the actual running speed at the moment, so that the efficient and reliable running of the centralized cooling system is ensured.

In this embodiment, the time for resetting the operation speed of the fresh water pump is not particularly limited, and may be 3 months or 6 months, and the concentrated cooling system may be allowed to operate normally.

Further, the present embodiment determining the optimal operation speed of the fresh water pump includes: acquiring vibration acceleration levels of the fresh water pump at different running speeds; and determining the optimal running speed of the fresh water pump according to the vibration acceleration levels of the fresh water pump at different running speeds.

The fresh water pumps have different running speeds and different vibration acceleration levels. A user can obtain vibration acceleration levels of the fresh water pump at different running speeds according to factory settings of the fresh water pump; the user can also actually measure the vibration acceleration level of the fresh water pump at different running speeds through the detection equipment; further, referring to fig. 2, according to the corresponding relationship between the operating speed and the vibration acceleration level of the fresh water pump, the optimal operating speed of the fresh water pump is determined, that is, the vibration acceleration level at the optimal operating speed of the fresh water pump is the minimum, but the optimal operating speed of the fresh water pump is not necessarily the actual operating speed of the fresh water pump, and the actual operating speed of the fresh water pump may be set according to the operating state of the ship; if the fresh water pump resonates with other structures at the optimal operating speed of the fresh water pump, the optimal operating speed of the fresh water pump is not suitable for the centralized cooling system, and the actual operating speed of the fresh water pump can be selected near the optimal operating speed of the fresh water pump so that the fresh water pump can operate at the speed.

On the basis of the above embodiments, the present embodiment, adjusting the concentration of nanoparticles in the fresh water circuit according to the change of the heat load of the heat source user, includes: when the heat load of a heat source user is increased, injecting the nano particles into the fresh water loop to increase the concentration of the nano particles in the fresh water loop; when the heat load of a heat source user is reduced, the nano particles in the fresh water loop are separated and recovered, and the concentration of the nano particles in the fresh water loop is reduced.

The fresh water pump in the centralized cooling system runs at a set actual running speed, and when the heat load of a heat source user changes, the conductivity and the heat transfer coefficient of the fresh water in the fresh water loop can be changed by increasing or reducing the concentration of the nano particles in the fresh water loop, so that the heat load requirement of the heat source user is met.

The concentrated cooling system for the ship comprises a fresh water loop, fresh water in the fresh water loop flows through a heat source user and a concentrated cooler, a fresh water pump is arranged on the fresh water loop and drives the fresh water on two sides of the concentrated cooler to circularly flow in the fresh water loop, furthermore, a liquid storage tank is communicated with the fresh water loop and stores nanoparticle fluid, when the heat load of the heat source user is increased, the nanoparticle fluid in the liquid storage tank flows to the fresh water loop, the concentration of nanoparticles in the fresh water loop is increased, the conductivity and the heat transfer coefficient of the fresh water in the fresh water loop are changed, the cooling load in the concentrated cooling system is increased until the concentration of the nanoparticles in the fresh water loop meets the heat load requirement of the heat source user, the liquid storage tank is closed, and the nanoparticle fluid is stopped being injected into the fresh water loop.

Furthermore, a separating device is communicated with the fresh water loop, and an outlet of the separating device is communicated with an inlet of the liquid storage tank. When the heat load of a heat source user is reduced, the separation device can separate the nanoparticles in the fresh water loop according to the characteristics of the nanoparticles, and the separated nanoparticles are conveyed into the liquid storage tank to be recycled, so that the concentration of the nanoparticles in the fresh water loop is reduced, the conductivity and the heat transfer coefficient of the fresh water in the fresh water loop are changed, the cooling load of the centralized cooling system is further reduced, and the separation device is closed and stops separating and adsorbing the nanoparticles in the fresh water loop until the concentration of the nanoparticles in the fresh water loop meets the heat load requirement of the heat source user.

In this embodiment, how the separation device separates and recovers the nanoparticles in the fresh water loop is not particularly limited, and the separation device may be an electromagnetic separation device that adsorbs the magnetic nanoparticles and recovers the magnetic nanoparticles to the liquid storage tank, or a centrifugal separation device that separates heavy or light nanoparticles by centrifugal action; the nanometer particles in the fresh water loop can be separated and recovered through the separation device.

Further, the present embodiment of adjusting the concentration of nanoparticles in the fresh water circuit according to the change of the heat load of the heat source user further comprises: acquiring the corresponding relation between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system; specifically, in the operation process of the ship centralized cooling system, the operation speed of the sea water pump is unchanged, the actual operation speed of the fresh water pump is set to be constant, and when the concentration of nanoparticles in the fresh water loop is changed, the conductivity and the heat transfer coefficient of the fresh water in the fresh water loop are changed along with the change of the actual operation speed of the fresh water pump; the actual running speed of the fresh water pump can be set to be R through experiments₁Opening the liquid storage tank, gradually injecting nanoparticle fluid into the fresh water loop, monitoring the concentration of nanoparticles in the fresh water loop through a concentration detection device, and simultaneously converting corresponding cooling load; adjusting the concentration of nanoparticles in the fresh water circuit to C₁、C₂、C₃……C_nConversion and recording of the corresponding cooling load Q₁、Q₂、Q₃、……Q_nAnd the concentration of the nano particles in the fresh water loop corresponds to the cooling load of the centralized cooling system one by one.

Further, according to the change of the heat load of the heat source user and the corresponding relation, the target concentration of the nano particles in the fresh water loop is determined, so that the cooling load of the centralized cooling system under the target concentration of the nano particles is adaptive to the heat load of the heat source user; specifically, in the operation process of the centralized cooling system, the heat load of the heat source users is increased or decreased, and the target concentration of the nanoparticles in the fresh water loop can be determined according to the corresponding relationship between the concentration of the nanoparticles in the fresh water loop and the cooling load of the centralized cooling system, that is, the cooling load of the centralized cooling system and the heat load of the heat source users correspond to each other one by one under the target concentration, so that the heat exchange of the heat source users can be satisfied.

After the target concentration of the nanoparticles in the fresh water loop is determined, the concentration of the nanoparticles in the fresh water loop is adjusted according to the target concentration of the nanoparticles, specifically, the concentration of the nanoparticles in the current fresh water loop is monitored, the liquid storage tank is opened to gradually inject nanoparticle fluid into the fresh water loop, the concentration of the nanoparticles in the fresh water loop is monitored in real time, the liquid storage tank is closed to stop injecting the nanoparticle fluid into the fresh water loop until the concentration of the nanoparticles is the same as the target concentration, and at the moment, the cooling load of the centralized cooling system is adaptive to the heat load of a heat source user, so that the heat exchange of the heat source user can be met.

On the basis of the foregoing embodiment, the obtaining the correspondence between the nanoparticle concentration in the fresh water circuit and the cooling load of the centralized cooling system in the embodiment specifically includes: when the running speed of the fresh water pump is kept constant, cooling loads corresponding to different nanoparticle concentrations in the fresh water loop are obtained according to temperature change information in the fresh water loop; specifically, a temperature sensor is arranged in the fresh water loop and used for monitoring the temperature of the fresh water loop at the outlet end and the inlet end of a heat source user or the temperature of the fresh water loop at the inlet end and the outlet end of a centralized cooler, when the running speed of the fresh water pump is kept constant, the heat load of the heat source user or the cold load of the centralized cooler can be converted according to the product of the temperature difference and the heat capacity and the flow rate of fresh water through the temperature difference between the inlet end and the outlet end of the heat source user or the temperature difference between the outlet end and the inlet end of the centralized cooler, and the cooling loads corresponding to different nanoparticle concentrations in the fresh water loop are obtained; and then the relation between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system at the running speed of the fresh water pump can be obtained.

When the running speed of the fresh water pump is kept constant, the heat load of a heat source user and the cold load of the centralized cooling system are in one-to-one correspondence, the heat load of the heat source user is obtained through calculation by changing the concentration of nanoparticles in the fresh water loop and monitoring the concentration of the nanoparticles in the fresh water loop in real time and the temperature difference between the outlet end and the inlet end of the heat source user, or the cooling load of the centralized cooling system is obtained through calculation by monitoring the temperature change between the outlet end and the inlet end of the centralized cooler in real time, and then the corresponding relation between the concentration of the nanoparticles in the fresh water loop and the cooling load of the centralized cooling system is obtained at the running speed of the fresh water pump.

Further, the obtaining the correspondence between the nanoparticle concentration in the fresh water circuit and the cooling load of the centralized cooling system in the embodiment further includes: setting a plurality of preset running speeds of the fresh water pump; and acquiring the corresponding relation between the concentration of the nano particles in the fresh water loop and the cooling load of the centralized cooling system under a plurality of preset operating speeds of the fresh water pump.

The step of adjusting the concentration of the nanoparticles in the fresh water loop according to the actual running speed of the fresh water pump specifically comprises the following steps: and adjusting the concentration of the nanoparticles in the fresh water loop according to the corresponding relation between the concentration of the nanoparticles and the cooling load of the centralized cooling system of the fresh water pump at the actual running speed.

That is, the actual operating speed of the fresh water pump is equal to or approaches the optimal operating speed, and the respective corresponding relationships between the nanoparticle concentration in the fresh water circuit and the cooling load of the concentrated cooling system at a plurality of preset operating speeds within a set range around the optimal operating speed of the fresh water pump can be obtained in advance through experiments. The plurality of preset operation speeds are in a set range near the optimal operation speed, the optimal operation speed can be included, the actual operation speed of the fresh water pump is contained in the plurality of preset operation speeds, and then after the actual operation speed of the fresh water pump is set by combining the operation state of the ship, the corresponding relation between the concentration of the nanoparticles in the fresh water loop and the cooling load of the centralized cooling system under the actual operation speed can be directly found out, and the follow-up operation control is facilitated.

In one embodiment, a plurality of preset operation speeds of the fresh water pump are set in a state where the operation speed of the sea water pump in the concentrated cooling system is kept constant, wherein the plurality of preset operation speeds are set according to the optimum operation speed of the fresh water pump, that is, the optimum operation speed of the fresh water pump is determined according to the relationship between the operation speed of the fresh water pump and the vibration acceleration level, and the plurality of preset operation speeds in the vicinity of the optimum operation speed of the fresh water pump are selected in conjunction with the operation state of the ship, and the plurality of preset operation speeds include the optimum operation speed of the fresh water pump, that is, R₁、R₂、R₃、……R_n。

Adjusting the running speed of the fresh water pump to R₁Opening the liquid storage tank, gradually injecting nanoparticle fluid into the fresh water loop, monitoring the conductivity of the fresh water in the fresh water loop through a concentration detection device to obtain the concentration of the nanoparticles in the fresh water loop, monitoring the temperature change between the outlet end and the inlet end of a heat source user or the temperature change between the inlet end and the outlet end of a centralized cooler through a temperature sensor, and obtaining the cooling load of the centralized cooling system under different nanoparticle concentrations in the fresh water loop through calculation, namely adjusting the concentrations of the nanoparticles in the fresh water loop to C₁、C₂、C₃……C_nRecording the temperatures of the outlet end and the inlet end of the corresponding heat source user or the temperatures of the inlet end and the outlet end of the concentrated cooler, converting and recording the cooling load Q of the concentrated cooling system corresponding to different nanoparticle concentrations₁、Q₂、Q₃、……Q_n(ii) a Regulating the running speed of the fresh water pump to R₂、R₃、……R_nAnd calculating the relation between the concentration of the nano particles in the fresh water loop and the cooling load in the centralized cooling system at different running speeds of the fresh water pump, as shown in fig. 3.

In a preferred embodiment, an optimum operating speed R of the fresh water pump is determined based on the operating performance of the fresh water pump₀During the actual operation of the ship, the fresh water pump is kept to operate at the optimal operation speed, the cooling load of the centralized cooling system is determined according to the operation state of a user, and the target concentration C of the nanoparticles in the fresh water loop is determined by combining the relation between the concentration of the nanoparticles in the fresh water loop and the cooling load of the centralized cooling system_r(ii) a Injecting nanoparticle fluid into the fresh water loop by opening the liquid storage tank or separating and recovering nanoparticles in the fresh water loop by the separation device, and monitoring the conductivity in the fresh water loop in real time by the concentration detection device to obtain the concentration of the nanoparticles in the fresh water loop until the concentration of the nanoparticles in the fresh water loop reaches C_rAnd further, the requirements of heat source users are met, and the energy efficiency, the quietness and the reliability of the fresh water pump and the whole centralized cooling system are improved.

According to the operation method of the centralized cooling system provided by the embodiment, the heat transfer coefficient of the fresh water loop is regulated and controlled quantitatively by a method of quantitatively injecting the nanoparticle fluid into the fresh water loop of the centralized cooling system or separating and recovering the nanoparticles through the separation device, so that the output requirements of different heat loads of a user can be met under the condition of not changing the running speed of the fresh water pump, the fresh water pump can always operate at the optimal working point, the efficiency of the system is improved, and the problems that vibration noise is increased and faults are easily caused due to deviation of the fresh water pump from the optimal working point are solved.

In the embodiment, a vibration acceleration level curve and a cooling load-nanoparticle fluid concentration curve of the fresh water pump at different rotating speeds are obtained through a pre-calibration test. Under different operating conditions, the fresh water pump is kept to operate at the optimal rotating speed, and the heat transfer coefficient is adjusted by adjusting the concentration of the nanoparticle fluid of the fresh water loop, so that the heat load derivation requirements under different operating conditions are met.

The operation control device of the ship centralized cooling system provided by the invention is described below, and the operation control device of the ship centralized cooling system described below and the operation method of the ship centralized cooling system described above can be correspondingly referred to each other.

The embodiment also provides an operation control device of the ship centralized cooling system, which is used for executing the operation method of the ship centralized cooling system, and the operation control device comprises a setting module, a control module and a control module, wherein the setting module is used for setting the actual operation speed of the fresh water pump; the acquisition module is used for acquiring the change of the heat load of the heat source user; and the adjusting module is used for adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

In one embodiment, the actual operation speed of the fresh water pump is set, the fresh water pump is enabled to keep operating at the actual operation speed, the change of the heat load of the heat source user is obtained in real time, when the heat load of the heat source user is increased or reduced, the concentration of nanoparticles in the fresh water loop is increased or reduced by injecting nanoparticle fluid into the fresh water loop or separating and recovering the nanoparticles through a separating device, the conductivity and the heat transfer coefficient of fresh water in the fresh water loop are changed, and then the cooling load of the centralized cooling system is changed to meet the heat load requirement of the heat source user.

Further, the operation control device of the centralized cooling system for ships provided by the embodiment further includes a concentration detection device and a temperature monitoring assembly, wherein the concentration detection device is used for detecting the concentration of nanoparticles in the fresh water circuit, that is, when the nanoparticle fluid in the liquid storage tank is injected into the fresh water circuit or the nanoparticles in the fresh water circuit separated by the separation device are recovered into the liquid storage tank, the concentration detection device monitors the conductivity change in the fresh water circuit in real time to further obtain the concentration of the nanoparticles in the fresh water circuit; the temperature monitoring assembly is used for monitoring the temperature in the fresh water loop, namely the temperature monitoring assembly comprises temperature sensors, two temperature sensors are arranged in the centralized cooling system, and the two temperature sensors are respectively arranged at the outlet end and the inlet end of a heat source user and used for monitoring the temperature at the two ends and acquiring the temperature difference between the two temperature sensors; or the heat capacity and the flow of the fresh water pump are combined to calculate to obtain the heat load of a heat source user or the cold load of the centralized cooling system.

Fig. 4 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 4: a processor (processor)410, a communication Interface 420, a memory (memory)430 and a communication bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the communication bus 440. The processor 410 may invoke logic instructions in the memory 430 to perform a method of operating a centralized cooling system for a vessel, the method comprising: setting the actual running speed of the fresh water pump; acquiring the change of the heat load of a heat source user; and adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

In addition, the logic instructions in the memory 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to perform a method for operating a centralized cooling system for a ship, the method comprising: setting the actual running speed of the fresh water pump; acquiring the change of the heat load of a heat source user; and adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

In yet another aspect, the present invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to perform the method for operating the centralized cooling system for a ship provided in the above aspects, the method comprising: setting the actual running speed of the fresh water pump; acquiring the change of the heat load of a heat source user; and adjusting the concentration of the nano particles in the fresh water loop according to the actual running speed of the fresh water pump and the change of the heat load of the heat source user so as to meet the heat load requirement of the heat source user.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.