A ship cooling water supply system design method and a water supply system

Abstract

The application discloses a ship cooling water supply system design method and a supply system, and relates to the technical field of ship power device design. The method comprises the following steps: dividing users with a demand water quantity and a pipe resistance ratio below a set value into a booster area; determining the specifications of a booster pump according to the demand water quantity and the required lift of the users in the booster area; and connecting the booster pump in series on the main pipe of the booster area to meet the lift requirement of the users in the booster area. Only a small number of high-resistance users need to be boosted, and the lift provided to other users can remain unchanged, so the power input of the system can be greatly reduced, and the operation efficiency is higher. The mixed-partition water supply mode is adopted, the pump set parameters are unified through the mixed water supply, the pump set types are reduced, and the operation power of the main pump set is reduced through the partition water supply. The problems that, in the prior art, the water pump needs to work at high power to meet the lift requirement of a small number of low-water high-resistance users, the system water supply efficiency is low, and the energy consumption is high are solved.

Description

Technical Field

[0001] This invention relates to the field of marine power plant design technology, specifically to a design method and system for a marine cooling water supply system. Background Technology

[0002] The cooling water system is the core system of a ship's power plant and the final cold source for the ship's heat load. Its main function is to remove the heat generated during the operation of the power plant directly or indirectly through external seawater cooling, ensuring that the temperature of each piece of equipment is controlled within the design range and maintaining the safe and stable operation of the power plant. Initially, my country's ship cooling water systems used a main pipe-branch pipe water supply model. Later, drawing on the cooling concepts of European and American ship power systems, a zoned water supply model was developed. Compared with the main pipe-branch pipe water supply model, the zoned water supply model initially classifies equipment with different hydraulic characteristics, and equipment with roughly similar characteristics is placed in the same area for separate water supply. A total of 2-3 zones are set up. The system efficiency and power consumption control are significantly improved by more than 50% compared with the main pipe-branch pipe water supply model. However, with the rapid development of my country's shipbuilding technology, the requirements for power consumption control and space resource utilization of the cooling system have become more stringent. Due to the significant differences in hydraulic characteristics and variable operating conditions among user equipment, a new water supply model is needed.

[0003] In existing technologies, in order to meet the head requirements of a small number of users with low water volume and high resistance, the water pump needs to operate at high power, resulting in low system water supply efficiency and high energy consumption. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a design method and water supply system for a ship cooling water supply system, which can solve the problem that in order to meet the head requirements of a small number of users with low water volume and high resistance, the water pump needs to operate at high power, resulting in low system water supply efficiency and high energy consumption.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] On the one hand, this solution provides a design method for a ship cooling water supply system, including:

[0007] Users whose water demand to pipe resistance ratio is below a set value are classified into the booster zone;

[0008] The parameters of the booster pump are determined based on the water demand and required head of the users in the booster area.

[0009] A booster pump is connected in series with the main pipe in the booster area to pressurize and deliver water to users in the booster area.

[0010] Some alternative solutions also include:

[0011] Users whose water demand-to-pipe resistance ratio is higher than a set value are classified into the normal zone;

[0012] The parameters of the main pump are determined based on the water demand of all users and the head requirements of users in the general area.

[0013] In some alternative solutions, the parameters of the main pump include:

[0014] The main pump's water supply volume is no less than the total water demand of users in the general area, and its head is higher than the head demand of the user with the highest head demand in the general area, which is the first set head.

[0015] In some alternative solutions, the main pump is operated using a variable frequency continuous regulation method.

[0016] In some alternative solutions, when there are more than two main pumps, all main pumps are of the same model.

[0017] Some alternative solutions also include:

[0018] Based on the flow allocation and functional needs of users in each general area, users in the general area are divided into different water supply zones for zoned water supply.

[0019] In some optional schemes, when ordinary users divide their areas, the number of areas they divide into shall not exceed three.

[0020] In some alternative solutions, the specifications of the booster pump include:

[0021] The booster pump's water supply is no less than the total water consumption of users in the booster area, and its head is higher than the difference between the head demand of the user with the highest head demand in the booster area and the basic head provided by the main pump, which is the second set head.

[0022] In some alternative schemes, the set value is 10 t / hm.

[0023] On the other hand, this solution provides a ship cooling water supply system, which is designed according to the above-mentioned ship cooling water supply system design method.

[0024] Compared with existing technologies, the advantages of this invention are as follows: This solution classifies users whose water demand to pipeline resistance ratio is below a set value into a booster zone; the specifications of the booster pump are determined based on the water demand and required head of the users in the booster zone; and the booster pump is connected in series with the main pipe of the booster zone to meet the head requirements of the users in the booster zone. Only a small number of high-resistance users need boosting, while the head provided to other users remains constant. Therefore, the system input power can be significantly reduced, resulting in higher operating efficiency. This solves the problem in existing technologies where, to meet the head requirements of a small number of low-water-demand, high-resistance users, the water pump needs to operate at high power, resulting in low system water supply efficiency and high energy consumption. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram illustrating the steps of the ship cooling water supply system design method in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of an example of a ship cooling water supply system according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, in one aspect, the present invention provides a design method for a ship cooling water supply system, comprising:

[0031] S1: Users whose water demand to pipeline resistance ratio is below the set value are classified into the booster zone.

[0032] S2: Determine the parameters of the booster pump based on the water demand and required head of the users in the booster area.

[0033] S3: Connect the booster pump in series with the main pipe in the booster area to pressurize and deliver water to users in the booster area.

[0034] In this embodiment, only a small number of high-resistance users need to have their pressure boosted, while the head supplied to other users remains unchanged. Therefore, the system input power can be significantly reduced, resulting in higher operating efficiency. This solves the problem in the prior art where, in order to meet the head requirements of a small number of low-volume, high-resistance users, the water pump needs to operate at maximum power, resulting in low system water supply efficiency and high energy consumption.

[0035] In some optional embodiments, it also includes:

[0036] Users whose water demand-to-pipe resistance ratio is higher than a set value are classified into the normal zone;

[0037] The parameters of the main pump are determined based on the water demand of all users and the head requirements of users in the general area.

[0038] In this embodiment, the main pump's head only needs to meet the head requirements of users in the ordinary area, maintaining low-power operation. Its flow-head characteristics are better matched with the system network characteristics, avoiding the problem of high noise during operation under extreme conditions. After the main pump's operating point is reduced, the water volume and flow velocity also decrease accordingly, alleviating the secondary excitation problem caused by turbulence in hydraulic components.

[0039] In some optional embodiments, the parameters of the main pump include:

[0040] The main pump's water supply volume is no less than the total water demand of users in the general area, and its head is higher than the head demand of the user with the highest head demand in the general area, which is the first set head.

[0041] In this embodiment, the head of the main pump is sufficient to deliver water to the booster pump, and the first set head does not exceed half of the head requirement of the user with the highest head requirement among the users in the ordinary area.

[0042] In some alternative embodiments, the main pump is operated using a variable frequency continuous regulation method.

[0043] In this embodiment, the main pump can adjust its operating speed according to the operating conditions, thereby changing the system characteristic frequency, altering the acoustic signature of the cooling water system, increasing the diversity and deceptiveness of the ship's operating characteristics, avoiding the exposure risk caused by the uniqueness of the ship's typical acoustic signature, and improving safe operation capabilities.

[0044] In some alternative embodiments, when there are more than two main pumps, all main pumps are of the same model.

[0045] In this embodiment, keeping the model of each main pump consistent can improve the stability of water supply and reduce the management and maintenance costs of the ship.

[0046] In some optional embodiments, it also includes:

[0047] Based on the flow allocation and functional needs of users in each general area, users in the general area are divided into different water supply zones for zoned water supply.

[0048] In this embodiment, dividing ordinary users into zones according to their water usage characteristics can improve the system's water supply efficiency.

[0049] In some optional embodiments, when a user in a regular area divides their area, the number of areas they divide into does not exceed three.

[0050] In this embodiment, the management and maintenance costs of ships are reduced by controlling the number of areas assigned to users in the general area.

[0051] In some alternative embodiments, the specifications of the booster pump include:

[0052] The booster pump's water supply is no less than the total water consumption of users in the booster area, and its head is higher than the difference between the head demand of the user with the highest head demand in the booster area and the basic head provided by the main pump, which is the second set head.

[0053] In this embodiment, the water supply of the booster pump only needs to meet the water consumption of the users in the booster area and provide the required head for the users in the booster area. The second set head is one-fifth of the difference between the head requirement of the user with the highest head requirement in the booster area and the basic head provided by the main pump.

[0054] In some optional embodiments, the set value is 10 t / hm.

[0055] In this embodiment, the unit of water demand is t / h, and the unit of pipeline resistance is m.

[0056] On the other hand, the present invention provides a ship cooling water supply system designed according to the above-mentioned ship cooling water supply system design method.

[0057] like Figure 2 The diagram shown is a schematic of a ship cooling water supply system.

[0058] In this example, the cooling water system includes two large pumps and three zones. Before partitioning, the system is typically divided according to the characteristics of the equipment to ensure minimal differences in the hydraulic parameters of the equipment within each zone, thereby ensuring uniform water supply and avoiding imbalances in water distribution between the equipment. Specifically, users 1 and 2 in zone 1, and users 3 and 4 in zone 2 are considered regular users, while users 5 and 6 in zone 3 are considered booster users.

[0059] The system's required effective power consumption is W1 = qh + Q1H1 + Q2H2. When no booster pump is added, the system's actual power consumption is W2 = (q + Q1 + Q2) × h. At this time, the additional power consumption is W3 = W2 - W1 = Q1 × (h - H1) + Q2 × (h - H2).

[0060] Where q < Q1 < Q2, h > H1 > H2, q is the water demand of users in area 3, h is the head demand of users in area 3, Q1 is the water demand of users in area 1, H1 is the head demand of users in area 1, Q2 is the water demand of users in area 2, and H2 is the head demand of users in area 2.

[0061] When a booster pump is connected in series in the main pipeline of area #3, the main pump provides power consumption W to meet the water demand of each user.a = (q + Q1 + Q2) × H1, the booster pump provides power consumption W b =q×(h-H1), total system power consumption W z =W a +W b =qh + Q1H1 + Q2H1, compared to the power saving W when no booster pump was added. s =W2-W z =Q1×(h-H1)+Q2×(h-H1).

[0062] In summary, this invention employs a mixed-zone water supply mode. By unifying pump parameters through mixed water supply, it reduces the number of pump types and lowers the main pump's operating power through zoned water supply. Users whose demand-to-pipe resistance ratio is below a set value are classified into booster zones. The specifications of the booster pumps are determined based on the demand-to-volume and required head of users in these zones. These booster pumps are connected in series to the main pipe of the booster zones to meet their head requirements. Only a small number of high-resistance users need boosting, while the head provided to other users remains constant. Therefore, the system's input power is significantly reduced, resulting in higher operating efficiency. This solves the problem in existing technologies where pumps must operate at maximum power to meet the head requirements of a small number of low-volume, high-resistance users, leading to low system water supply efficiency and high energy consumption.

[0063] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0064] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0065] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method of designing a ship cooling water feed system, characterized by, The method comprises the following steps: Users with a demand water volume and a pipe resistance ratio below a set value are divided into a booster area; Parameters of a booster pump are determined according to the demand water volume and the required lift of the users in the booster area; The booster pump is connected in series to a main pipe in the booster area to pressurize and deliver water to the users in the booster area; Users with a demand water volume and a pipe resistance ratio higher than the set value are divided into a normal area; Parameters of a main pump are determined according to the demand water volume of all users and the lift requirement of the users in the normal area; Users in the normal area are divided into different water supply areas according to the flow distribution and functional requirements of each user in the normal area for zoned water supply; The number of divided areas for the users in the normal area is not more than three.

2. The marine cooling water feed system design method of claim 1, wherein, The parameters of the main pump include: The water supply volume of the main pump is not less than the total demand water volume of the users in the normal area, and the lift of the main pump is higher than the lift requirement of the user with the highest lift requirement among the users in the normal area, with the difference being a first set lift.

3. The marine cooling water feed system design method of claim 1, wherein, The main pump is continuously adjusted in frequency during operation.

4. The marine cooling water feed system design method of claim 1, wherein When the number of main pumps is more than two, the models of the main pumps are the same.

5. The marine cooling water feed system design method of claim 1 wherein, The specifications of the booster pump include: The water supply volume of the booster pump is not less than the total demand water volume of the users in the booster area, and the lift of the booster pump is higher than the difference between the lift requirement of the user with the highest lift requirement among the users in the booster area and the basic lift provided by the main pump, with the difference being a second set lift.

6. The marine cooling water feed system design method of claim 1 wherein, The set value is 10 t / hm.

7. A ship cooling water supply system, characterized in that The method is used for designing a ship cooling water supply system according to any one of claims 1-6.

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