Pump valve dynamic coordination control method and system of ship cooling system

Abstract

The invention provides a pump valve dynamic coordination control method and system of a ship cooling system, and relates to the technical field of ship power system.The method comprises the steps that state parameters of the ship cooling system are collected in real time, and the current vacuum state of a mixing condenser and the current film forming state of condensate water sprayed by multiple nozzles of a nozzle adjusting valve set are obtained; adjusting and controlling the opening degree of a nozzle adjusting valve group based on the current vacuum state so as to ensure that the vacuum degree of the mixing condenser meets the control requirement; the spray flow set value is obtained by obtaining the mapping relation between the pressure difference of an inlet and an outlet of a nozzle and the spray flow of correspondingly sprayed condensate water, the current spray flow is made to be equal to the spray flow set value by regulating and controlling the rotating speed of a condensate water circulating pump, and it is guaranteed that the condensate water is sprayed out in a liquid film shape. The problem that according to an existing ship cooling system, it cannot be guaranteed that condensate water is sprayed out in a liquid film shape after being adjusted through a condensate water circulating pump and a nozzle adjusting valve set is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship power system control, and in particular to a pump and valve dynamic coordinated control method and system for a ship cooling system. Background Art

[0002] At present, the ship cooling system using a mixing condenser is equipped with a condensate circulation pump and a nozzle regulating valve group as condensate flow regulating equipment. The condensate and the turbine exhaust steam are fully in contact in the mixing condenser, thereby achieving the vacuum control requirements.

[0003] However, the vacuum control process of traditional ship cooling systems relies on expert experience, and mainly uses the trial-and-error method to determine the state parameters of the condensate circulation pump and the nozzle regulating valve group to achieve vacuum control requirements. It lacks the dynamic coordination and optimization capabilities of the condensate circulation pump and the nozzle regulating valve group, and cannot ensure that the condensate is ejected in the form of a liquid film after being regulated by the condensate circulation pump and the nozzle regulating valve group. It is difficult to take into account both the precise control of the vacuum and the cooling efficiency of the ship cooling system. Summary of the Invention

[0004] In response to the above-mentioned problems, the present invention provides a method and system for dynamic coordinated control of pumps and valves in a ship cooling system, which is used to solve the problem that the current ship cooling system cannot ensure that the condensate is sprayed out in the form of a liquid film after being regulated by the condensate circulation pump and the nozzle regulating valve group.

[0005] In a first aspect, the present invention provides a method for dynamic coordinated control of pumps and valves in a ship cooling system, the method comprising: Real-time collection of ship cooling system status parameters to obtain the current vacuum status of the mixing condenser and the current film formation status of the condensed water sprayed by multiple nozzles of the nozzle regulating valve group; Regulating the opening of the nozzle regulating valve group based on the current vacuum state to ensure that the vacuum degree of the mixing condenser meets the control requirements; Based on the current film-forming state, the rotation speed of the condensate circulation pump is controlled to ensure that the condensate is ejected in the form of a liquid film; Among them, the speed control method of the condensate circulation pump includes: obtaining the mapping relationship between the inlet and outlet pressure difference of the nozzle and the corresponding spray flow rate of the condensate sprayed out; obtaining the pressure difference setting value, and obtaining the spray flow rate setting value for the nozzle to spray the condensate in the form of a liquid film based on the mapping relationship, and by regulating the speed of the condensate circulation pump so that the current spray flow rate is equal to the spray flow rate setting value, the condensate is sprayed out in the form of a liquid film.

[0006] Furthermore, the opening degree of the nozzle regulating valve group is regulated in such a manner that the order of sequentially opening the plurality of nozzles is opposite to the order of sequentially closing the plurality of nozzles.

[0007] Furthermore, the state parameters include at least the vacuum degree of the mixing condenser and the inlet and outlet pressure difference of the nozzle regulating valve group.

[0008] Furthermore, by comparing the vacuum degree of the mixing condenser with the vacuum setting value, the current vacuum state of the mixing condenser is obtained; by comparing the inlet and outlet pressure differences of multiple nozzles with the pressure difference setting value, the current film formation state of the condensed water sprayed by multiple nozzles is obtained.

[0009] Furthermore, obtaining the current vacuum state includes: When the vacuum degree of the mixing condenser is greater than the vacuum set value, it is determined that the mixing condenser is not cooled enough, and the spray flow rate of the nozzle of the nozzle regulating valve group needs to be increased; When the vacuum degree of the mixing condenser is equal to the vacuum set value, it is determined that the cooling of the mixing condenser is appropriate, and there is no need to adjust the opening of the nozzle regulating valve group; When the vacuum degree of the mixing condenser is less than the vacuum set value, it is determined that the mixing condenser is overcooled, and the spray flow rate of the nozzle of the nozzle regulating valve group needs to be reduced.

[0010] Furthermore, obtaining based on the current film forming state includes: When the inlet and outlet pressure difference of multiple nozzles is greater than the pressure difference setting value, it is determined that the inlet and outlet pressure difference is too large and causes the liquid film to rupture. In this case, it is necessary to reduce the inlet and outlet pressure difference by adjusting the speed of the condensate circulation pump; When the inlet and outlet pressure difference of multiple nozzles is equal to the pressure difference setting value, it is determined that the inlet and outlet pressure difference is appropriate, and there is no need to adjust the speed of the condensate circulation pump; When the inlet and outlet pressure difference of multiple nozzles is less than the pressure difference setting value, it is determined that the inlet and outlet pressure difference is too small to cause film formation, and it is necessary to increase the inlet and outlet pressure difference by adjusting the speed of the condensate circulation pump.

[0011] Furthermore, the mapping relationship is: the inlet and outlet pressure difference of the multiple nozzles is proportional to the square of the spray flow rate.

[0012] Furthermore, the mapping relationship is: ; in, Indicates the inlet and outlet pressure difference; Indicates the nozzle inlet pressure; Indicates nozzle outlet pressure; Indicates the spray flow rate; Indicates the density of liquid at the nozzle inlet; Indicates the density of the liquid at the nozzle outlet; Indicates the nozzle inlet cross-sectional area; Indicates the nozzle outlet cross-sectional area.

[0013] Furthermore, the Bernoulli equation is used to obtain the mapping relationship between the inlet and outlet pressure difference of the nozzle and the spray flow rate of the corresponding condensate sprayed out.

[0014] In a second aspect, the present invention provides a pump and valve dynamic coordination control system for a ship cooling system, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the above methods.

[0015] In general, the present invention provides a method and system for dynamically coordinating the control of pumps and valves in a ship cooling system. The technical solution conceived by the present invention can achieve the following beneficial effects compared with the prior art: (1) The present invention ensures that the vacuum degree of the mixed condenser meets the control requirements by regulating the opening of the nozzle regulating valve group; obtains the mapping relationship between the inlet and outlet pressure difference of the nozzle and the spray flow rate of the corresponding condensate, and then obtains the spray flow rate setting value, and regulates the rotation speed of the condensate circulation pump so that the current spray flow rate is equal to the spray flow rate setting value, thereby ensuring that the condensate is sprayed in the form of a liquid film; the present invention can ensure the vacuum degree of the mixed condenser of the ship cooling system, so that the condensate in the branch where the nozzle regulating valve is opened first is sprayed in the form of a liquid film, thereby ensuring that the condensate is sprayed in the form of a liquid film after being regulated by the condensate circulation pump and the nozzle regulating valve group, thereby improving the cooling efficiency of the ship cooling system, and taking into account both the precise control of the vacuum degree and the cooling efficiency of the ship cooling system.

[0016] (2) The present invention uses a sequential control valve method to control the opening of the nozzle regulating valve group, so that the opening order of multiple nozzles is opposite to the closing order. The nozzles are opened in sequence in a certain order, so that the flow rate of the cooling medium gradually increases. This not only avoids the impact of a sudden increase in flow rate caused by the simultaneous opening of multiple nozzles on the system, but also can more accurately adjust the flow rate of the cooling medium according to the cooling needs of the ship equipment; similarly, when closing the nozzles, the closing order is opposite to the opening order, that is, the nozzle opened first is closed last, and the nozzle opened later is closed first. This can gradually reduce the flow rate, which can not only avoid negative pressure or other unstable factors caused by a sudden drop in flow rate and maintain the stability of the system pressure, but also effectively avoid overcooling or insufficient cooling, and realize fine adjustment of the cooling system; this adjustment method makes the flow rates between the nozzles complement and coordinate with each other, give full play to the best flow regulation performance of the nozzle group, and ensure the precise control of the vacuum degree of the ship cooling system.

[0017] (3) By obtaining the mapping relationship between the inlet and outlet pressure difference of the nozzle and the corresponding spray flow rate of the condensate, the spray flow set value is obtained. By adjusting the speed of the condensate circulation pump, the speed adjustment is quantified. By using this mapping relationship, the speed of the circulation pump can be adjusted quickly and accurately, so that the spray flow rate of the nozzle is adapted to the actual cooling demand of the host, thereby achieving precise control of the spray flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the method and steps of a dynamic coordinated control method and system for pumps and valves of a ship cooling system provided by the present invention; Figure 2 The present invention provides a method and system for dynamically coordinating the control of pumps and valves in a ship cooling system. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0021] It should be noted that, in the description of the embodiments of the present invention, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a method, step, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such method, step, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the method, step, or apparatus comprising the element.

[0022] Traditional vacuum control relies primarily on trial-and-error methods based on expert experience to determine the state parameters of the condensate circulation pump and nozzle regulating valve assembly. This fails to ensure that the condensate is ejected in a film-like form after being regulated by the condensate circulation pump and nozzle regulating valve assembly, and in other words, cannot guarantee cooling efficiency. Therefore, to balance the vacuum level and cooling efficiency of a ship cooling system and ensure that the condensate is ejected in a film-like form after being regulated by the condensate circulation pump and nozzle regulating valve assembly, the present invention proposes a method and system for dynamic coordinated control of pumps and valves in a ship cooling system.

[0023] Specifically, if Figure 1 As shown, the method includes: S101: collecting state parameters of the ship cooling system in real time to obtain the current vacuum state of the mixing condenser and the current film formation state of condensed water sprayed by multiple nozzles of the nozzle regulating valve group.

[0024] like Figure 2 As shown in the figure, the ship's cooling system primarily consists of a mixing condenser, a seawater heat exchanger, a condensate circulation pump, a nozzle regulating valve block, connecting piping, and other accessories. The ship's cooling system is equipped with a condensate circulation pump and a nozzle regulating valve block as condensate flow control devices. By adjusting the condensate circulation pump's speed and the nozzle opening of the nozzle regulating valve block, the condensate flow rate, and thus the vacuum level in the mixing condenser, is regulated. To ensure the ship's cooling system's efficiency, the condensate needs to be regulated by the condensate circulation pump and the nozzle regulating valve block before being ejected in a liquid film.

[0025] It should be noted that the state parameters include at least the vacuum degree of the mixing condenser and the inlet and outlet pressure differentials of multiple nozzles. Furthermore, they may include turbine exhaust volume, spray flow rate, nozzle regulating valve block opening, condensate circulation pump speed, nozzle inlet cross-sectional area, nozzle inlet condensate density, nozzle outlet cross-sectional area, and nozzle outlet condensate density.

[0026] As an embodiment, the current vacuum state of the mixing condenser is obtained by comparing the vacuum degree of the mixing condenser with the vacuum set value.

[0027] Furthermore, when the vacuum degree of the mixing condenser is greater than the vacuum set value, it is determined that the mixing condenser is insufficiently cooled, and the spray flow rate of the nozzle of the nozzle regulating valve group needs to be increased; When the vacuum degree of the mixing condenser is equal to the vacuum set value, it is determined that the cooling of the mixing condenser is appropriate, and there is no need to adjust the opening of the nozzle regulating valve group; When the vacuum degree of the mixing condenser is less than the vacuum set value, it is determined that the mixing condenser is overcooled, and the spray flow rate of the nozzle of the nozzle regulating valve group needs to be reduced.

[0028] As an embodiment, the current film-forming status of the condensed water ejected by the multiple nozzles is obtained by comparing the inlet and outlet pressure differences of the multiple nozzles with the pressure difference setting values.

[0029] Furthermore, when the inlet and outlet pressure difference of multiple nozzles is greater than the pressure difference setting value, it is determined that the inlet and outlet pressure difference is too large and causes the liquid film to rupture, and it is necessary to reduce the inlet and outlet pressure difference by adjusting the speed of the condensate circulation pump; When the inlet and outlet pressure difference of multiple nozzles is equal to the pressure difference setting value, it is determined that the inlet and outlet pressure difference is appropriate, and there is no need to adjust the speed of the condensate circulation pump; When the inlet and outlet pressure difference of multiple nozzles is less than the pressure difference setting value, it is determined that the inlet and outlet pressure difference is too small to cause film formation, and it is necessary to increase the inlet and outlet pressure difference by adjusting the speed of the condensate circulation pump.

[0030] S102: Regulating the opening of the nozzle regulating valve group based on the current vacuum state to ensure that the vacuum degree of the mixing condenser meets the control requirements.

[0031] In order to make the flow between the nozzles complement and coordinate with each other, give full play to the best flow regulation performance of the nozzle group, and ensure the precise control of the vacuum degree of the ship cooling system, preferably, the opening of the nozzle regulating valve group is regulated in the following way: the order of opening and closing the multiple nozzles is opposite to the order of closing.

[0032] The vacuum level in the mixing condenser is maintained by sequentially controlling the valve openings. For example, a nozzle control valve group includes three nozzles. The logic for sequential control of the openings is: opening in the order "nozzle control valve 3 - nozzle control valve 2 - nozzle control valve 1," and closing in the order "nozzle control valve 1 - nozzle control valve 2 - nozzle control valve 3." This is how the three nozzle control valves are controlled. When opening, nozzle control valve 3 is controlled first, while when closing, nozzle control valve 1 is controlled first. In other words, the nozzle that opens first closes last, and the nozzle that opens last closes first.

[0033] More specifically, the valve control logic of the nozzle regulating valve is: Open all valves in sequence (that is, open all valves to 100%), and start adjusting the first nozzle regulating valve f1 until the first nozzle regulating valve is closed; during the adjustment of the first nozzle regulating valve, only the flow of the first nozzle regulating valve changes dynamically, and the other valves are fully open.

[0034] After the first nozzle regulating valve is closed, start adjusting the second nozzle regulating valve f2 until the second nozzle regulating valve is closed; in the process of adjusting the second nozzle regulating valve, the first nozzle regulating valve is closed and there is no flow, only the flow of the second nozzle regulating valve changes dynamically, and the other valves are fully open.

[0035] After the second nozzle regulating valve is closed, start adjusting the third nozzle regulating valve f3 until the third nozzle regulating valve is closed; in the process of adjusting the third nozzle regulating valve, the first nozzle regulating valve and the second nozzle regulating valve are both closed, there is no flow, only the flow of the third nozzle regulating valve changes dynamically, and the other valves are fully open.

[0036] And so on, until the penultimate nozzle regulating valve f n-1 After closing, start adjusting the last nozzle regulating valve f n ; During the adjustment of the last nozzle regulating valve, the other valves are closed and there is no flow. Only the last nozzle regulating valve has flow and the flow changes dynamically.

[0037] In other words, at any given moment, only one nozzle control valve is adjusted, and the flow rate of only one nozzle control valve changes dynamically. This valve control logic is used to control the opening of the nozzle control valve group to ensure that the vacuum degree of the mixing condenser meets the control requirements.

[0038] S103: regulating the rotation speed of the condensate circulation pump based on the current film forming state to ensure that the condensate is ejected in the form of a liquid film.

[0039] Among them, the speed control method of the condensate circulation pump includes: obtaining the mapping relationship between the inlet and outlet pressure difference of the nozzle and the corresponding spray flow rate of the condensate; obtaining the pressure difference setting value, and obtaining the spray flow rate setting value for the nozzle to spray the condensate in the form of a liquid film based on the mapping relationship, and controlling the speed of the condensate circulation pump so that the current spray flow rate is equal to the spray flow rate setting value, thereby realizing the condensate being sprayed in the form of a liquid film.

[0040] It should be noted that the condensate from a valve with dynamically changing flow cannot be sprayed out in the form of a liquid film; therefore, it is only necessary to adjust the spray flow of the fully open valve so that the condensate from the corresponding tributary of the fully open valve is sprayed out in the form of a liquid film, thereby maximizing the cooling efficiency.

[0041] Furthermore, the mapping relationship is: the inlet and outlet pressure difference of multiple nozzles is proportional to the square of the spray flow rate, that is, Furthermore, a mapping relationship is obtained using the liquid density at the nozzle inlet, the liquid density at the nozzle outlet, the nozzle inlet cross-sectional area, and the nozzle outlet cross-sectional area.

[0042] As an embodiment, the Bernoulli equation may be used to obtain a mapping relationship between the inlet and outlet pressure difference of the nozzle and the spray flow rate of the corresponding condensate sprayed out.

[0043] The Bernoulli equation is: ; in, Indicates the nozzle inlet pressure; Indicates nozzle outlet pressure; Indicates the density of liquid at the nozzle inlet; Indicates the density of the liquid at the nozzle outlet; Indicates the liquid flow rate at the nozzle inlet; Indicates the liquid flow rate at the nozzle outlet; Indicates the nozzle inlet height; Indicates the nozzle outlet height; Represents the acceleration due to gravity.

[0044] According to the continuity equation, under steady flow conditions, the volume flow rate of the fluid is constant, that is, ;in, Indicates the nozzle inlet cross-sectional area; Indicates the nozzle outlet cross-sectional area.

[0045] Substituting the continuity equation into Bernoulli's equation, with the nozzle axis horizontal, we have ; Due to the spray flow , therefore, the spray flow rate can be solved as: .

[0046] Then the mapping relationship between the inlet and outlet pressure difference of multiple nozzles and the spray flow rate is obtained as follows: ; in, Indicates the inlet and outlet pressure difference; Indicates the nozzle inlet pressure; Indicates nozzle outlet pressure; Indicates the spray flow rate; Indicates the density of liquid at the nozzle inlet; Indicates the density of the liquid at the nozzle outlet; Indicates the nozzle inlet cross-sectional area; Indicates the nozzle outlet cross-sectional area.

[0047] Finally, the speed of the condensate circulation pump is adjusted so that the current spray flow rate is equal to the spray flow rate set value, thereby achieving the condensate being sprayed out in the form of a liquid film.

[0048] For example, the nozzle regulating valve group includes three nozzles. If the vacuum degree of the mixing condenser is guaranteed by adjusting the opening sequence of the nozzle regulating valve group, at this time, nozzle regulating valve 1 is closed, nozzle regulating valve 2 is opened at 60%, and nozzle regulating valve 3 is opened at 100%, then the flow rate of the branch where the nozzle regulating valve 3 that is opened first is located is adjusted to be equal to the spray flow rate setting value, thereby ensuring that the pressure difference between the nozzle inlet and outlet of the branch where the nozzle regulating valve 3 is located is equal to the pressure difference setting value, so that the condensed water in the branch where the nozzle regulating valve 3 is located is sprayed out in the form of a liquid film.

[0049] It should be noted that if a satisfactory vacuum control effect and a condensate film-like ejection effect cannot be obtained, S102 and S103 are continuously repeated, and the vacuum degree is controlled by adjusting the opening sequence of the nozzle regulating valve group, and the pump-valve coordination control parameters of the branch flow of the nozzle regulating valve are controlled by adjusting the speed of the condensate circulation pump, until a satisfactory vacuum control effect and a condensate film-like ejection effect are achieved. In this way, on the basis of ensuring the vacuum degree of the mixing condenser of the transmission cooling system, the condensate of the branch where the nozzle regulating valve is opened first is ensured to be ejected in a liquid film, thereby taking into account the vacuum degree and cooling efficiency of the ship cooling system.

[0050] In a second aspect, the present invention provides a pump and valve dynamic coordination control system for a ship cooling system, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of any of the above methods.

[0051] Specifically, the pump-valve dynamic coordination control system includes a system status monitoring module, a nozzle regulating valve group opening sequence control module, a pressure difference flow mapping module, and a condensate circulation pump speed control module.

[0052] The system status monitoring module is used to collect the status parameters of the ship's cooling system in real time, obtain the current vacuum status of the mixing condenser and the current film formation status of the condensed water sprayed by multiple nozzles of the nozzle regulating valve group.

[0053] The nozzle regulating valve group opening sequence control module is used to receive the current vacuum state and control the opening of the nozzle regulating valve group based on the current vacuum state to ensure that the vacuum degree of the mixing condenser meets the control requirements.

[0054] The pressure difference flow mapping module is used to obtain the mapping relationship between the inlet and outlet pressure difference of the nozzle and the corresponding spray flow rate of the condensed water; obtain the pressure difference setting value, and obtain the spray flow rate setting value for the nozzle to spray the condensed water in the form of a liquid film based on the mapping relationship.

[0055] The condensate circulation pump speed control module is used to obtain the spray flow set value, and to control the speed of the condensate circulation pump so that the current spray flow is equal to the spray flow set value, thereby realizing the condensate being sprayed in the form of a liquid film.

[0056] The technical features of the systems are consistent and will not be described in detail here.

[0057] In summary, the present invention can, on the basis of ensuring the vacuum degree of the mixed condenser of the ship's cooling system, enable the condensate of the branch where the nozzle regulating valve is opened first to be sprayed out in the form of a liquid film, ensuring that the condensate is sprayed out in the form of a liquid film after being adjusted by the condensate circulation pump and the nozzle regulating valve group, thereby improving the cooling efficiency of the ship's cooling system and taking into account both the precise control of the vacuum degree and the cooling efficiency of the ship's cooling system.

[0058] It should be noted that for the aforementioned embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0059] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0060] In the several embodiments provided in this application, it should be understood that the disclosed methods or systems can be implemented in other ways. For example, the embodiments described above are merely illustrative, and the division of the units described is merely a logical functional division. In actual implementation, other division methods may be used, such as combining or integrating multiple units or components into another system, or ignoring or not implementing certain features.

[0061] The above is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure herein, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any variation, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not recorded in the present disclosure. The description and examples are to be regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0062] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for dynamic coordinated control of pumps and valves in a ship cooling system, characterized in that: The method comprises: Real-time collection of ship cooling system status parameters to obtain the current vacuum status of the mixing condenser and the current film formation status of the condensed water sprayed by multiple nozzles of the nozzle regulating valve group; Regulating the opening of the nozzle regulating valve group based on the current vacuum state to ensure that the vacuum degree of the mixing condenser meets the control requirements; Based on the current film-forming state, the rotation speed of the condensate circulation pump is controlled to ensure that the condensate is ejected in the form of a liquid film; Among them, the speed control method of the condensate circulation pump includes: obtaining the mapping relationship between the inlet and outlet pressure difference of the nozzle and the corresponding spray flow rate of the condensate sprayed out; obtaining the pressure difference setting value, and obtaining the spray flow rate setting value for the nozzle to spray the condensate in the form of a liquid film based on the mapping relationship, and by regulating the speed of the condensate circulation pump so that the current spray flow rate is equal to the spray flow rate setting value, the condensate is sprayed out in the form of a liquid film.

2. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 1, characterized in that: The opening degree of the nozzle regulating valve group is regulated in such a manner that the order of sequentially opening the plurality of nozzles is opposite to the order of sequentially closing the plurality of nozzles.

3. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 1, characterized in that: The state parameters at least include the vacuum degree of the mixing condenser and the inlet and outlet pressure difference of the nozzle regulating valve group.

4. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 3, characterized in that: By comparing the vacuum degree of the mixing condenser with the vacuum setting value, the current vacuum state of the mixing condenser is obtained; by comparing the inlet and outlet pressure differences of multiple nozzles with the pressure difference setting value, the current film formation state of the condensed water sprayed by multiple nozzles is obtained.

5. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 4, characterized in that: The current vacuum state is obtained by: When the vacuum degree of the mixing condenser is greater than the vacuum set value, it is determined that the mixing condenser is not cooled enough, and the spray flow rate of the nozzle of the nozzle regulating valve group needs to be increased; When the vacuum degree of the mixing condenser is equal to the vacuum set value, it is determined that the cooling of the mixing condenser is appropriate, and there is no need to adjust the opening of the nozzle regulating valve group; When the vacuum degree of the mixing condenser is less than the vacuum set value, it is determined that the mixing condenser is overcooled, and the spray flow rate of the nozzle of the nozzle regulating valve group needs to be reduced.

6. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 4, characterized in that: The obtaining based on the current film forming state includes: When the inlet and outlet pressure difference of multiple nozzles is greater than the pressure difference setting value, it is determined that the inlet and outlet pressure difference is too large and causes the liquid film to rupture. In this case, it is necessary to reduce the inlet and outlet pressure difference by adjusting the speed of the condensate circulation pump; When the inlet and outlet pressure difference of multiple nozzles is equal to the pressure difference setting value, it is determined that the inlet and outlet pressure difference is appropriate, and there is no need to adjust the speed of the condensate circulation pump; When the inlet and outlet pressure difference of multiple nozzles is less than the pressure difference setting value, it is determined that the inlet and outlet pressure difference is too small to cause film formation, and it is necessary to increase the inlet and outlet pressure difference by adjusting the speed of the condensate circulation pump.

7. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 1, characterized in that: The mapping relationship is: the inlet and outlet pressure difference of multiple nozzles is proportional to the square of the spray flow rate.

8. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 7, characterized in that: The mapping relationship is: ； in, Indicates the inlet and outlet pressure difference; Indicates the nozzle inlet pressure; Indicates nozzle outlet pressure; Indicates the spray flow rate; Indicates the density of liquid at the nozzle inlet; Indicates the density of the liquid at the nozzle outlet; Indicates the nozzle inlet cross-sectional area; Indicates the nozzle outlet cross-sectional area.

9. The method for dynamic coordinated control of pumps and valves in a ship cooling system according to claim 1, characterized in that: The Bernoulli equation is used to obtain the mapping relationship between the inlet and outlet pressure difference of the nozzle and the corresponding spray flow rate of the condensate sprayed out.

10. A pump and valve dynamic coordination control system for a ship cooling system, comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 9.

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