Energy-saving seawater cooling system

Abstract

The utility model relates to an energy-saving seawater cooling system which comprises a heat exchanger, a seawater cooling unit and a fresh water cooling unit, and the seawater cooling unit comprises a seawater tank, a first seawater pipeline and a second seawater pipeline. A first manual butterfly valve, a vacuum pressure gauge, a first filter, a variable-frequency seawater pump, an electromagnetic flowmeter, a first check valve, a second manual butterfly valve and a first temperature sensor are sequentially mounted on the first seawater pipeline from one side close to the seawater tank; the fresh water cooling unit comprises equipment needing to be cooled, a fresh water tank, a three-way temperature control valve, a first fresh water pipeline, a second fresh water pipeline, a third fresh water pipeline, a fourth fresh water pipeline and a fifth fresh water pipeline; according to the seawater cooling system, the pipelines, the temperature sensors and the valves are matched with one another, the rotating speed of the variable-frequency seawater pump is adjusted in real time according to the thermal load of the system, on-demand supply of seawater flow is achieved, the heat exchange requirement of the system can be met, meanwhile, power consumed by the system is reduced, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of seawater cooling systems, in particular to an energy-saving seawater cooling system. Background Art

[0002] When designing ships, the cooling water system capacity is typically designed based on the maximum possible seawater temperature as the maximum heat load. Therefore, under most operating conditions, the cooling water system capacity is redundant. For ships operating in unlimited ranges, they can navigate between high and low latitudes and different sea areas around the world, where shallow seawater temperatures fluctuate constantly. However, generally speaking, seawater surface temperatures range from 4°C to 30°C. To meet these requirements, the central cooling water system is designed to operate at full speed in seawater temperatures of 32°C. However, in actual operating conditions, ships neither maintain full speed nor remain in the warmest waters. Furthermore, seawater temperatures fluctuate with the seasons. Consequently, the seawater flow rate in a ship's seawater cooling system is significantly redundant. Furthermore, the lower the seawater temperature, the less seawater flow is required for heat exchange, resulting in increased unnecessary power consumption. Traditional central cooling systems regulate flow through throttling, wasting significant energy.

[0003] Therefore, the present invention proposes an energy-saving seawater cooling system to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an energy-saving seawater cooling system, reduce system power consumption and reduce energy consumption.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: an energy-saving seawater cooling system, the innovation of which is:

[0006] A heat exchanger, wherein the heat exchanger is provided with a seawater inlet, a seawater outlet, a fresh water inlet and a fresh water outlet;

[0007] A seawater cooling unit, comprising a seawater tank, a first seawater pipeline, and a second seawater pipeline, wherein the inlet of the first seawater pipeline is connected to the outlet of the seawater tank, and the outlet of the first seawater pipeline is connected to the seawater inlet of the heat exchanger. The first seawater pipeline is installed, starting from the side close to the seawater tank, with a first manual butterfly valve, a vacuum pressure gauge, a first filter, a variable frequency seawater pump, an electromagnetic flowmeter, a first check valve, a second manual butterfly valve, and a first temperature sensor. The inlet of the second seawater pipeline is connected to the seawater outlet of the heat exchanger, and the outlet of the second seawater pipeline is connected to the outside world. A second temperature sensor is installed on the second seawater pipeline;

[0008] Fresh water cooling unit; the fresh water cooling unit includes a device to be cooled, a fresh water tank, a three-way temperature control valve, a first fresh water pipeline, a second fresh water pipeline, a third fresh water pipeline, a fourth fresh water pipeline and a fifth fresh water pipeline, the inlet of the first fresh water pipeline is connected to the outlet of the fresh water tank, the outlet of the first fresh water pipeline is connected to the inlet of the device to be cooled, a third manual butterfly valve, a fresh water pump, a second check valve and a fourth manual butterfly valve are installed on the first fresh water pipeline in sequence from the side close to the fresh water tank, the inlet of the second fresh water pipeline is connected to the outlet of the device to be cooled, the outlet of the second fresh water pipeline is connected to the fresh water inlet of the heat exchanger, a third temperature sensor is installed on the second fresh water pipeline, and the outlet of the third fresh water pipeline is connected to the outlet of the device to be cooled. The inlet is connected to the fresh water outlet of the heat exchanger, the outlet of the third fresh water pipeline is connected to the first inlet of the three-way temperature control valve, the inlet of the fourth fresh water pipeline is connected to the second fresh water pipeline, the connection between the fourth fresh water pipeline and the second fresh water pipeline is located between the third temperature sensor and the heat exchanger, the outlet of the fourth fresh water pipeline is connected to the second inlet of the three-way temperature control valve, a fifth manual butterfly valve is installed on the fourth fresh water pipeline, the inlet of the fifth fresh water pipeline is connected to the outlet of the three-way temperature control valve, the outlet of the fifth fresh water pipeline is connected to the first fresh water pipeline, the connection between the fifth fresh water pipeline and the first fresh water pipeline is located on the side of the third manual butterfly valve close to the fresh water tank, and a fourth temperature sensor is installed on the fifth fresh water pipeline.

[0009] Furthermore, a sixth manual butterfly valve, a second filter and a seventh manual butterfly valve are sequentially installed at the outlet of the seawater tank.

[0010] Furthermore, a first pressure gauge, a first thermometer and an eighth manual butterfly valve are installed at the seawater inlet, seawater outlet, fresh water inlet and fresh water outlet of the heat exchanger.

[0011] Furthermore, a ninth manual butterfly valve is installed at the outlet of the fresh water tank.

[0012] Furthermore, a second thermometer, a second pressure gauge and a tenth manual butterfly valve are installed at the inlet of the equipment to be cooled, and a third thermometer, a third pressure gauge, a flow regulating valve, a third check valve and an eleventh manual butterfly valve are installed at the outlet of the equipment to be cooled.

[0013] Furthermore, the variable frequency seawater pump and fresh water pump both have inlet and outlet pressure gauges.

[0014] Furthermore, a fourth check valve and a twelfth manual butterfly valve are installed at the outlet of the second seawater pipeline.

[0015] The advantages of the present invention are:

[0016] (1) The seawater cooling system of the present invention adjusts the speed of the variable frequency seawater pump in real time according to the heat load of the system through the mutual cooperation of various pipelines, temperature sensors and valves, so as to realize the on-demand supply of seawater flow, thereby ensuring the heat exchange requirements of the system and reducing the power consumption of the system, thereby reducing energy consumption and making the cooling system more intelligent and automated.

[0017] (2) The three-way temperature control valve of the present invention mixes fresh water of different temperatures by adjusting the opening of the fourth fresh water pipeline of the bypass pipeline, thereby ensuring the constant temperature of the fresh water at the outlet of the three-way temperature control valve, and ultimately ensuring the stability of the fresh water cooling unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 This is a schematic diagram of the pipeline connection of the energy-saving seawater cooling system of the present utility model.

[0020] Figure 2 This is a working principle diagram of the energy-saving seawater cooling system of the present utility model. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0022] Example

[0023] This embodiment provides an energy-saving seawater cooling system, such as Figure 1 As shown, it includes a heat exchanger, a seawater cooling unit and a fresh water cooling unit.

[0024] The heat exchanger, the core device of the cooling system, functions to facilitate countercurrent heat exchange between seawater and freshwater, transferring heat from the cooling equipment in the freshwater cooling unit to the open seawater cooling unit, ultimately transferring the heat to the outside world. Two heat exchangers 14 are provided, each equipped with a seawater heat exchange pipe and a freshwater heat exchange pipe for heat exchange between seawater and freshwater. The seawater heat exchange pipe has a seawater inlet and a seawater outlet on either side, while the freshwater heat exchange pipe has a freshwater inlet and a freshwater outlet on either side. Each heat exchanger is equipped with a first pressure gauge 15, a first thermometer 16, and an eighth manual butterfly valve 17 at each of the seawater inlet, seawater outlet, freshwater inlet, and freshwater outlet.

[0025] The seawater cooling unit includes a seawater tank 1 , a first seawater pipeline 5 and a second seawater pipeline 19 .

[0026] There are two seawater tanks 1, which are located on the port side and starboard side of the ship respectively. The outlet of each seawater tank 1 is sequentially installed with a sixth manual butterfly valve 2, a second filter 3 and a seventh manual butterfly valve 4.

[0027] The inlet of the first seawater pipeline 5 branches into two first branches, which are respectively connected to the outlets of the two seawater tanks 1. The outlet of the first seawater pipeline 5 branches into two second branches, which are respectively connected to the seawater inlets of the two heat exchangers 14. The middle branch of the first seawater pipeline 5 forms two parallel first seawater main pipelines and a first seawater backup pipeline. The first seawater main pipeline and the first seawater backup pipeline are successively installed with a first manual butterfly valve 6, a vacuum pressure gauge 7, a first filter 8, a variable frequency seawater pump 9 with inlet and outlet pressure gauges, an electromagnetic flowmeter 10, a first check valve 11, and a second manual butterfly valve 12 from the side close to the seawater tank 1. A first temperature sensor 13 is installed at the outlet of the first seawater pipeline 5.

[0028] The inlet of the second seawater pipeline 19 branches into two third branches, which are respectively connected to the seawater outlets of the two heat exchangers. The outlet of the second seawater pipeline 19 is connected to the outside world. A second temperature sensor 18 is installed on the second seawater pipeline 19. A fourth check valve 20 and a twelfth manual butterfly valve 21 are installed on the side of the second temperature sensor 18 on the second seawater pipeline 19 close to the outlet.

[0029] The variable frequency seawater pump 9 of the seawater cooling unit is used to provide kinetic energy to each pipeline of the open seawater cooling unit, so that the seawater cooling unit continuously absorbs seawater for cooling the heat exchanger and discharges the seawater that has absorbed heat.

[0030] The fresh water cooling unit includes equipment to be cooled 36 , a fresh water tank 26 , a three-way temperature control valve 23 , a first fresh water pipeline 28 , a second fresh water pipeline 42 , a third fresh water pipeline 22 , a fourth fresh water pipeline 44 and a fifth fresh water pipeline 25 .

[0031] The freshwater tank 26 is used to store fresh water and provide a freshwater source to the freshwater cooling unit. A ninth manual butterfly valve 27 is installed at the outlet of the freshwater tank 26. Several devices 36 requiring cooling are provided. A second thermometer 35, a second pressure gauge 34, and a tenth manual butterfly valve 33 are installed at the inlet of each device requiring cooling. A third thermometer 37, a third pressure gauge 38, a flow control valve 39, a third check valve 40, and an eleventh manual butterfly valve 41 are installed at the outlet of each device requiring cooling.

[0032] The inlet of the first fresh water pipeline 28 is connected to the outlet of the fresh water tank 26. The outlet of the first fresh water pipeline 28 branches to form several fourth branches connected to the inlet of each equipment to be cooled. The middle branch of the first fresh water pipeline 28 forms two parallel first fresh water main pipelines and a first fresh water backup pipeline. The first fresh water main pipeline and the first fresh water backup pipeline are successively installed with a third manual butterfly valve 29, a fresh water pump 30 with inlet and outlet pressure gauges, a second check valve 31 and a fourth manual butterfly valve 32 starting from the side close to the fresh water tank 26.

[0033] The inlet of the second fresh water pipeline 42 branches to form several fifth branches connected to the outlet of each cooling device 36 . A third temperature sensor 43 is installed on the second fresh water pipeline 42 . The outlet of the second fresh water pipeline 42 is connected to the fresh water inlet of the heat exchanger 14 .

[0034] The inlet of the third fresh water pipeline 22 branches to form two sixth branches respectively connected to the fresh water outlets of the two heat exchangers 14 . The outlet of the third fresh water pipeline 22 is connected to the first inlet of the three-way temperature control valve 23 .

[0035] The inlet of the fourth fresh water pipeline 44 is connected to the second fresh water pipeline 42. The connection between the fourth fresh water pipeline 44 and the second fresh water pipeline 42 is located between the third temperature sensor 43 and the heat exchanger 14. The outlet of the fourth fresh water pipeline 44 is connected to the second inlet of the three-way temperature control valve 23. A fifth manual butterfly valve 45 is installed on the fourth fresh water pipeline 44.

[0036] The inlet of the fifth fresh water pipeline 25 is connected to the outlet of the three-way temperature control valve 23, and the outlet of the fifth fresh water pipeline 25 is connected to the first fresh water pipeline 28. The connection between the fifth fresh water pipeline 25 and the first fresh water pipeline 28 is located on the side of the first fresh water main pipeline and the first fresh water backup pipeline close to the fresh water tank 26. A fourth temperature sensor 24 is installed on the fifth fresh water pipeline 25.

[0037] The first fresh water pipeline 28, the second fresh water pipeline 42, the third fresh water pipeline 22 and the fifth fresh water pipeline 25 in the fresh water cooling unit cooperate with the heat exchanger 14 to form a fresh water circulation pipeline. A fresh water pump is used to transport the fresh water cooled by seawater in the heat exchanger 14 to the equipment to be cooled 36. The fresh water that absorbs the heat of the equipment to be cooled 36 is then transported back to the heat exchanger 14, completing the closed circulation of the fresh water.

[0038] The three-way temperature control valve 23 is used to adjust the opening of the fourth fresh water pipeline 44 of the bypass pipeline to mix fresh water of different temperatures, thereby ensuring the constant temperature of the fresh water at the outlet of the three-way temperature control valve 23 and ultimately ensuring the stability of the fresh water cooling unit.

[0039] Working principle: The arranged temperature sensors detect the seawater inlet and outlet temperatures and freshwater inlet and outlet temperatures of the heat exchanger, calculate the required seawater flow rate based on the heat load, and then calculate the required speed and frequency of the variable frequency seawater pump. According to the freshwater temperature requirement of the freshwater cooling unit, the seawater cooling water flow rate is adjusted to achieve the purpose of seawater flow on demand.

[0040] Here is an example of a control, such as Figure 2 As shown. The first temperature sensor 13 detects the seawater inlet temperature of the seawater cooling unit, the second temperature sensor 18 detects the seawater outlet temperature of the seawater cooling unit, and the fourth temperature sensor 24 detects the freshwater outlet temperature of the three-way temperature control valve 23. In this example, the seawater outlet temperature of the seawater cooling unit is required to be less than 49°C, and the freshwater temperature required by the freshwater cooling unit is 36°C, which means that the freshwater outlet temperature of the three-way temperature control valve 23 is required to be 36°C. The control method of the variable frequency seawater pump is as follows:

[0041] The first step is to calculate the required seawater flow rate based on the heat load, then obtain the calculated value of the speed required by the variable frequency seawater pump, and adjust the speed of the variable frequency seawater pump to reach the calculated value;

[0042] Step 2: Detect the fresh water outlet temperature;

[0043] Step 3: Determine the difference between the fresh water outlet temperature and 36°C;

[0044] If the fresh water outlet temperature is greater than 36°C, increase the speed of the variable frequency seawater pump;

[0045] If the fresh water outlet temperature is less than 36°C, go directly to step 4;

[0046] If the fresh water outlet temperature is equal to 36°C, determine whether the flow rate in the fourth fresh water pipeline of the bypass pipeline of the three-way temperature control valve is 0. If the flow rate is 0, determine whether the seawater outlet temperature is less than 49°C. If the seawater outlet temperature is less than 49°C, maintain the speed of the variable frequency seawater pump unchanged. If the seawater outlet temperature is greater than or equal to 49°C, increase the speed of the variable frequency seawater pump. If the flow rate is not 0, proceed to step 4.

[0047] Step 4: Determine whether the seawater outlet temperature is less than 49°C. If not, increase the speed of the variable frequency seawater pump. If so, reduce the speed of the seawater pump and return to step 2.

[0048] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An energy-saving seawater cooling system, characterized by: include A heat exchanger, wherein the heat exchanger is provided with a seawater inlet, a seawater outlet, a fresh water inlet and a fresh water outlet; A seawater cooling unit, comprising a seawater tank, a first seawater pipeline, and a second seawater pipeline, wherein the inlet of the first seawater pipeline is connected to the outlet of the seawater tank, and the outlet of the first seawater pipeline is connected to the seawater inlet of the heat exchanger. The first seawater pipeline is installed, starting from the side close to the seawater tank, with a first manual butterfly valve, a vacuum pressure gauge, a first filter, a variable frequency seawater pump, an electromagnetic flowmeter, a first check valve, a second manual butterfly valve, and a first temperature sensor. The inlet of the second seawater pipeline is connected to the seawater outlet of the heat exchanger, and the outlet of the second seawater pipeline is connected to the outside world. A second temperature sensor is installed on the second seawater pipeline; Fresh water cooling unit; the fresh water cooling unit includes a device to be cooled, a fresh water tank, a three-way temperature control valve, a first fresh water pipeline, a second fresh water pipeline, a third fresh water pipeline, a fourth fresh water pipeline and a fifth fresh water pipeline, the inlet of the first fresh water pipeline is connected to the outlet of the fresh water tank, the outlet of the first fresh water pipeline is connected to the inlet of the device to be cooled, a third manual butterfly valve, a fresh water pump, a second check valve and a fourth manual butterfly valve are installed on the first fresh water pipeline in sequence from the side close to the fresh water tank, the inlet of the second fresh water pipeline is connected to the outlet of the device to be cooled, the outlet of the second fresh water pipeline is connected to the fresh water inlet of the heat exchanger, a third temperature sensor is installed on the second fresh water pipeline, and the outlet of the third fresh water pipeline is connected to the outlet of the device to be cooled. The inlet is connected to the fresh water outlet of the heat exchanger, the outlet of the third fresh water pipeline is connected to the first inlet of the three-way temperature control valve, the inlet of the fourth fresh water pipeline is connected to the second fresh water pipeline, the connection between the fourth fresh water pipeline and the second fresh water pipeline is located between the third temperature sensor and the heat exchanger, the outlet of the fourth fresh water pipeline is connected to the second inlet of the three-way temperature control valve, a fifth manual butterfly valve is installed on the fourth fresh water pipeline, the inlet of the fifth fresh water pipeline is connected to the outlet of the three-way temperature control valve, the outlet of the fifth fresh water pipeline is connected to the first fresh water pipeline, the connection between the fifth fresh water pipeline and the first fresh water pipeline is located on the side of the third manual butterfly valve close to the fresh water tank, and a fourth temperature sensor is installed on the fifth fresh water pipeline.

2. The energy-saving seawater cooling system according to claim 1, characterized in that: A sixth manual butterfly valve, a second filter and a seventh manual butterfly valve are sequentially installed at the outlet of the seawater tank.

3. The energy-saving seawater cooling system according to claim 1, characterized in that: A first pressure gauge, a first thermometer and an eighth manual butterfly valve are installed at the seawater inlet, the seawater outlet, the fresh water inlet and the fresh water outlet of the heat exchanger.

4. The energy-saving seawater cooling system according to claim 1, characterized in that: A ninth manual butterfly valve is installed at the outlet of the fresh water tank.

5. The energy-saving seawater cooling system according to claim 1, characterized in that: A second thermometer, a second pressure gauge and a tenth manual butterfly valve are installed at the inlet of the equipment to be cooled, and a third thermometer, a third pressure gauge, a flow regulating valve, a third check valve and an eleventh manual butterfly valve are installed at the outlet of the equipment to be cooled.

6. The energy-saving seawater cooling system according to claim 1, characterized in that: The variable frequency seawater pump and fresh water pump both have inlet and outlet pressure gauges.

7. The energy-saving seawater cooling system according to claim 1, characterized in that: A fourth check valve and a twelfth manual butterfly valve are installed at the outlet of the second seawater pipeline.

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