CN118270215A - Ocean engineering ship cooling system, and control method, device and equipment thereof - Google Patents
Ocean engineering ship cooling system, and control method, device and equipment thereof Download PDFInfo
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- CN118270215A CN118270215A CN202410714922.2A CN202410714922A CN118270215A CN 118270215 A CN118270215 A CN 118270215A CN 202410714922 A CN202410714922 A CN 202410714922A CN 118270215 A CN118270215 A CN 118270215A
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- 238000001816 cooling Methods 0.000 title claims abstract description 371
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000013505 freshwater Substances 0.000 claims abstract description 226
- 239000013535 sea water Substances 0.000 claims abstract description 100
- 238000006073 displacement reaction Methods 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 238000004590 computer program Methods 0.000 claims description 20
- 238000004134 energy conservation Methods 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
- B63H21/383—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like for handling cooling-water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/12—Heating; Cooling
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- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
Abstract
The application relates to a marine engineering ship cooling system, a control method, a control device and a control equipment thereof, and the whole scheme is that the flow of a heat exchange bypass pipeline in the marine engineering ship cooling system is obtained; calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the marine engineering ship cooling system; if the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started; and if the ratio is not less than the preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start. The whole scheme can dynamically adjust the quantity of the started seawater cooling pumps based on the flow of the heat exchange bypass pipeline and a preset bypass flow threshold, avoids energy waste caused by starting the redundant seawater cooling pumps, and can achieve the purpose of energy conservation.
Description
Technical Field
The present application relates to the technical field of marine engineering vessels, and in particular to a marine engineering vessel cooling system, and a control method, a control device, a computer device, a storage medium and a computer program product thereof.
Background
The conventional marine cooling system generally adopts the following three technical schemes: 1. the 2x100% seawater cooling pump is adopted, the change of the heat exchange quantity required by a cooling user is ignored, and the seawater cooling pump continuously runs under full load. 2. The variable-frequency seawater cooling pump with the frequency of 2x100 percent is adopted, and the variable-frequency seawater cooling pump adjusts the output flow of the variable-frequency pump according to the signal feedback of a temperature sensor in a cooling fresh water system, so that the heat balance is achieved. 3. The 3x50% seawater cooling pump is adopted, the 2x50% seawater cooling pump continuously runs under full load, and when one pump fails, a temperature sensor arranged in the cooling system gives out a high-temperature alarm. After receiving the alarm, the crew manually starts a 1x50% seawater cooling pump.
In the marine fresh water cooling schemes, the sea water cooling pump continuously runs under full load, so that precious power resources on a platform are wasted greatly, and energy-saving fresh water cooling cannot be realized.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an energy-efficient marine engineering vessel cooling system, and a control method, apparatus, computer device, storage medium and computer program product thereof.
In a first aspect, the present application provides a marine engineering vessel cooling system. The system comprises at least 2 seawater cooling pumps, a fresh water cooling circulating pump, a heat exchange assembly, a heat exchange bypass pipeline, a flowmeter and a central control assembly;
The at least 2 seawater cooling pumps are connected with the heat exchange assembly, the fresh water cooling circulating pump is connected with the heat exchange assembly, the heat exchange bypass pipeline is connected with the heat exchange assembly in parallel to form a bypass waterway of fresh water circulation, the flowmeter is arranged on the heat exchange bypass pipeline, and the central control assembly is respectively connected with the at least 2 seawater cooling pumps and the flowmeter;
When power is on, the central control component receives bypass flow of the heat exchange bypass pipeline collected by the flowmeter, and if the ratio of the bypass flow to the fresh water cooling circulation pump displacement is smaller than a preset bypass flow threshold, 2 seawater cooling pumps are controlled to be started; and if the ratio of the bypass flow to the fresh water cooling circulation pump displacement is not smaller than a preset bypass flow threshold, controlling the starting of the single sea water cooling pump.
In one embodiment, the preset bypass flow threshold is determined based on a required heat exchange amount, a fresh water heat exchange inlet-outlet water temperature difference, and the fresh water cooling circulation pump displacement.
In one embodiment, the preset bypass flow threshold is 55%.
In a second aspect, the application also provides a control method of the marine engineering ship cooling system. The method comprises the following steps:
Acquiring the flow of a heat exchange bypass pipeline in a marine engineering ship cooling system;
calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the ocean engineering ship cooling system;
If the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started;
and if the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
In one embodiment, the control method of the cooling system of the marine engineering ship further includes:
obtaining the required heat exchange amount and fresh water heat exchange inlet and outlet water temperature difference corresponding to an ocean engineering ship cooling system, and obtaining the displacement of a fresh water cooling circulating pump in the ocean engineering ship cooling system;
And calculating a preset bypass flow threshold according to the required heat exchange amount, the fresh water heat exchange inlet-outlet water temperature difference and the fresh water cooling circulation pump displacement.
In one embodiment, the calculating the preset bypass flow threshold according to the required heat exchange amount, the fresh water heat exchange water inlet-outlet temperature difference and the fresh water cooling circulation pump displacement includes:
Acquiring a first required heat exchange amount corresponding to the non-running time of the intermittent user and a second required heat exchange amount corresponding to the running time of the intermittent user according to the required heat exchange amount;
Obtaining a corresponding first fresh water cooling demand flow when an intermittent user does not run according to the first demand heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference; according to the second required heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference, corresponding fresh water cooling second required flow rate during intermittent user operation is obtained;
Calculating the ratio of the first required fresh water cooling flow to the displacement of the fresh water cooling circulating pump and the ratio of the second required fresh water cooling flow to the displacement of the fresh water cooling circulating pump to obtain a first fresh water cooling utilization rate and a second fresh water cooling utilization rate respectively;
And determining a preset bypass flow threshold based on the first fresh water cooling utilization rate and the second fresh water cooling utilization rate.
In one embodiment, determining a preset bypass flow threshold based on the first fresh water cooling utilization and the second fresh water cooling utilization includes:
Calculating a difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate;
And determining a preset bypass flow threshold according to the difference value of the first fresh water cooling utilization rate and the second fresh water cooling utilization rate.
In one embodiment, the preset bypass flow threshold is 55%.
In a third aspect, the application also provides a control device of the ocean engineering ship cooling system. The device comprises:
the parameter acquisition module is used for acquiring the flow of a heat exchange bypass pipeline in the marine engineering ship cooling system;
the calculating module is used for calculating the ratio of the flow of the heat exchange bypass pipeline to the discharge capacity of the fresh water cooling circulating pump in the ocean engineering ship cooling system;
The control module is used for controlling 2 seawater cooling pumps in the ocean engineering ship cooling system to start when the ratio is smaller than a preset bypass flow threshold value; and when the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
In a fourth aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
Acquiring the flow of a heat exchange bypass pipeline in a marine engineering ship cooling system;
calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the ocean engineering ship cooling system;
If the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started;
and if the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
In a fifth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
Acquiring the flow of a heat exchange bypass pipeline in a marine engineering ship cooling system;
calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the ocean engineering ship cooling system;
If the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started;
and if the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
In a sixth aspect, the application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
Acquiring the flow of a heat exchange bypass pipeline in a marine engineering ship cooling system;
calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the ocean engineering ship cooling system;
If the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started;
and if the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
The ocean engineering ship cooling system, the control method, the control device, the computer equipment, the storage medium and the computer program product thereof acquire the flow of the heat exchange bypass pipeline in the ocean engineering ship cooling system; calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the marine engineering ship cooling system; if the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started; and if the ratio is not less than the preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start. The whole scheme can dynamically adjust the quantity of the started seawater cooling pumps based on the flow of the heat exchange bypass pipeline and a preset bypass flow threshold, avoids energy waste caused by starting the redundant seawater cooling pumps, and can achieve the purpose of energy conservation.
Drawings
FIG. 1 is a schematic block diagram of a cooling system for an ocean engineering vessel in one embodiment;
FIG. 2 is a schematic diagram of a cooling system for an ocean engineering vessel in one embodiment;
FIG. 3 is a flow chart of a method of controlling a cooling system of an ocean engineering vessel in one embodiment;
FIG. 4 is a block diagram of a control device of the cooling system of the ocean engineering vessel in one embodiment;
Fig. 5 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The control method of the ocean engineering ship cooling system provided by the embodiment of the application can be applied to an application environment shown in figure 1. The whole ocean engineering ship cooling system comprises at least 2 ocean water cooling pumps 101, a fresh water cooling circulating pump 102, a heat exchange assembly 103, a heat exchange bypass pipeline 104, a flowmeter 105 and a central control assembly 106, wherein the control method of the whole ocean engineering ship cooling system is applied to the central control assembly 106, and the central control assembly 106 obtains the flow of the heat exchange bypass pipeline 104 in the ocean engineering ship cooling system; calculating the ratio of the flow of the heat exchange bypass pipeline 104 to the displacement of the fresh water cooling circulation pump 102 in the marine engineering ship cooling system; if the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps 101 in the ocean engineering ship cooling system are controlled to be started; and if the ratio is not less than the preset bypass flow threshold, controlling a single seawater cooling pump 101 in the ocean engineering ship cooling system to start.
As shown in fig. 1, the present application provides a marine engineering vessel cooling system. The system comprises at least 2 seawater cooling pumps 101, a fresh water cooling circulating pump 102, a heat exchange assembly 103, a heat exchange bypass pipeline 104, a flowmeter 105 and a central control assembly 106;
At least 2 seawater cooling pumps 101 are connected with a heat exchange assembly 103, a fresh water cooling circulating pump 102 is connected with the heat exchange assembly 103, a heat exchange bypass pipeline 104 is connected with the heat exchange assembly 103 in parallel to form a bypass waterway of fresh water circulation, a flowmeter 105 is arranged on the heat exchange bypass pipeline 104, and a central control assembly 106 is respectively connected with at least 2 seawater cooling pumps 101 and the flowmeter 105;
When power is on, the central control component 106 receives bypass flow of the heat exchange bypass pipeline 104 acquired by the flowmeter 105, and if the ratio of the bypass flow to the displacement of the fresh water cooling circulation pump 102 is smaller than a preset bypass flow threshold, 2 seawater cooling pumps 101 are controlled to be started; if the ratio of the bypass flow to the displacement of the fresh water cooling circulation pump 102 is not less than the preset bypass flow threshold, the single sea water cooling pump 101 is controlled to start.
The seawater cooling pump 101 is a special water pump, and is mainly used in various ocean application fields such as ocean ships, ocean engineering, ocean oil platforms and the like. The working principle is that the motor drives the pump blade to do reciprocating or rotating motion, thereby sucking the seawater into the pump body, and then carrying out heat exchange on the seawater and the cooled equipment through the heat exchanger, thereby achieving the purpose of cooling. At least 2 seawater cooling pumps 101 are selected for operation (a single seawater cooling pump is configured to be 50% of cooling water required power, namely, if the seawater cooling flow required by the ship design working condition is 100m 3/h, a seawater cooling pump of 3x50m 3/h is arranged, in an initial state, the two seawater cooling pumps are started, when the bypass pipeline flow threshold value is smaller than a preset bypass flow threshold value, the two pumps still keep operating, when the bypass flow value is not smaller than the preset bypass flow threshold value, one pump is stopped, and only one pump is kept to be operated so as to meet the cooling heat required by intermittent users.
The fresh water cooling circulation pump 102 is an apparatus for a water cooling circulation system, and the principle thereof is to realize a circulation flow of fresh water by operation of the pump. Such pumps are typically composed of an electric motor, a pump body, and an impeller. The motor provides power and is connected to an impeller in the pump body via a shaft. When the motor is started, the impeller starts to rotate, causing the flow of fresh water. The fresh water cooling circulation pump 102 transfers the cooling fresh water to the cooling user, absorbs heat emitted from the cooling user, and increases the temperature of the cooling fresh water. The warmed cooling fresh water is cooled by a heat exchanger or is not cooled and passes through a heat exchange bypass pipeline 104; and mixing the two waterways to obtain the target-temperature cooling fresh water.
The heat exchange assembly 103 is an assembly for realizing heat exchange between fresh water and seawater, and may specifically include a single or multiple heat exchangers, where high-temperature fresh water and low-temperature seawater flow into the heat exchange assembly 103, and the two exchange heat in respective pipelines to reduce the temperature of the fresh water, and the warmed seawater is re-discharged into the sea under the lightance of the seawater cooling pump 101.
The heat exchange bypass pipeline 104 is a pipeline which is arranged outside the heat exchange assembly 103 and is connected with the heat exchange assembly 103 in parallel, and when the required heat exchange amount is smaller, high-temperature fresh water can flow to the fresh water outlet end of the heat exchange assembly 103 directly through the heat exchange bypass pipeline 104 without passing through the heat exchange assembly 103, and the high-temperature fresh water is mixed with cooled fresh water to obtain cooling water with a target temperature, namely a fresh water circulation bypass waterway is formed.
The flow meter 105 is used to collect the flow of chilled fresh water in the heat exchange bypass line 104 and then send the collected bypass flow to the central control assembly 106. The flow meter 105 may be a flow sensor in particular.
The central control component 106 is configured to receive, when power is on, the bypass flow of the heat exchange bypass pipeline 104 collected by the flow meter 105, and if the ratio of the bypass flow to the displacement of the fresh water cooling circulation pump 102 is less than a preset bypass flow threshold, control the 2 seawater cooling pumps 101 to be started; if the ratio of the bypass flow to the displacement of the fresh water cooling circulation pump 102 is not less than the preset bypass flow threshold, the single sea water cooling pump 101 is controlled to start. The central control component 106 may be a host computer, an industrial personal computer, a controller, etc. The preset bypass flow threshold is a preset threshold, when the ratio of the bypass flow to the displacement of the fresh water cooling circulation pump 102 is smaller than the preset bypass flow threshold, the fact that less cooling fresh water passes through the heat exchange bypass pipeline 104 at the moment is indicated, and the fresh water with larger flow passes through the heat exchanger to exchange heat, namely, the current heat exchange requirement is larger, and at the moment, 2 sea water cooling pumps 101 are started to meet the heat exchange requirement; the ratio of the bypass flow to the displacement of the fresh water cooling circulation pump 102 is not smaller than the preset bypass flow threshold, which indicates that more cooling fresh water passes through the heat exchange bypass pipeline 104 at this time, and the fresh water with smaller flow is subjected to heat exchange through the heat exchanger, that is, the current heat exchange requirement is smaller, so that the heat exchange requirement can be met only by starting the single sea water cooling pump 101, and energy saving is realized.
Specifically, the preset bypass flow threshold is determined based on the amount of heat exchange required, the fresh water heat exchange inlet-outlet water temperature difference, and the displacement of the fresh water cooling circulation pump 102, which may specifically be 55%.
The ocean engineering ship cooling system is used for acquiring the flow of a heat exchange bypass pipeline in the ocean engineering ship cooling system; calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the marine engineering ship cooling system; if the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started; and if the ratio is not less than the preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start. The whole scheme can dynamically adjust the quantity of the started seawater cooling pumps based on the flow of the heat exchange bypass pipeline and a preset bypass flow threshold, avoids energy waste caused by starting the redundant seawater cooling pumps, and can achieve the purpose of energy conservation.
In order to explain the technical principle and the operation of the cooling system for a marine engineering vessel according to the present application in detail, a description will be given below with reference to fig. 2.
In a specific application example, the whole marine engineering ship cooling system is composed of 3x50% seawater cooling pump 101 (3 seawater cooling pumps running at 50% cooling water demand power), 2x100% fresh water cooling circulation pump 102, 2x100% heat exchanger 103, flow sensor 105, central control station 106, related isolation valves and pipe accessories and other components. The 1×100% fresh water circulation pump 102 pumps the cooling fresh water to the cooling user, absorbs heat emitted from the cooling user, and increases the temperature of the cooling fresh water. The warmed cooling fresh water is cooled by the heat exchanger or is not cooled and passes through a bypass pipeline of the heat exchanger, and finally is converged at a three-way water mixing valve at the downstream of the heat exchanger. The first inlet of the three-way water mixing valve is connected with the cooling fresh water pipeline of the heat exchanger, the second inlet of the three-way water mixing valve is connected with the cooling fresh water bypass pipeline of the heat exchanger, and the first outlet of the three-way water mixing valve is connected with the inlet pipeline of the fresh water cooling circulating pump. The three-way water mixing valve can adjust the opening of the first inlet and the second inlet, adjust the flow passing through the heat exchanger and the bypass pipeline of the heat exchanger, and finally obtain the target-temperature cooling fresh water (for example, 36 ℃). The seawater cooling pump barge is used for conveying cooling seawater to the heat exchanger to take away heat emitted by a cooling user, so that heat balance is realized.
When the heat exchange amount required by cooling users is large, and the flow on the bypass pipe line of the heat exchanger is smaller than the preset threshold value of the design flow, the flow sensor on the bypass pipe line of the heat exchanger transmits the detected low-flow signal of the cooling fresh water to the central control station, and the central control station sends out a command to start the 2x50% seawater cooling pump so as to meet the cooling requirement. Preferably, in the marine energy-saving cooling system, when the heat exchange amount required by a cooling user is smaller, the flow rate on the bypass line of the heat exchanger is not smaller than 55% of the design flow rate, the flow sensor on the bypass line of the heat exchanger transmits the detected high-flow signal of the cooling fresh water to the central control station, and the central control station sends out a command to close one of the 2x50% seawater cooling pumps, so that only the 1x50% seawater cooling pump can normally operate.
As shown in FIG. 3, the application also provides a control method of the marine engineering ship cooling system. The method comprises the following steps:
S200: acquiring the flow of a heat exchange bypass pipeline in a marine engineering ship cooling system;
s400: calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the marine engineering ship cooling system;
s600: if the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started;
s800: and if the ratio is not less than the preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
The preset bypass flow threshold is a preset threshold. When the ratio of the bypass flow to the fresh water cooling circulation pump displacement is smaller than a preset bypass flow threshold, the fact that less cooling fresh water passes through the heat exchange bypass pipeline at the moment is indicated, and fresh water with larger flow passes through the heat exchanger to exchange heat, namely, currently, larger heat exchange requirements exist, and at the moment, 2 sea water cooling pumps are started to meet the heat exchange requirements; the ratio of the bypass flow to the displacement of the fresh water cooling circulation pump is not smaller than a preset bypass flow threshold, which indicates that more cooling fresh water passes through the heat exchange bypass pipeline at the moment, and the fresh water with smaller flow is subjected to heat exchange through the heat exchanger, namely the current heat exchange requirement is smaller, so that the heat exchange requirement can be met by only starting a single sea water cooling pump, and energy conservation is realized.
In practical application, the preset bypass flow threshold value can be calculated according to the required heat exchange amount, the fresh water heat exchange water inlet and outlet temperature difference and the fresh water cooling circulation pump displacement. The preset bypass flow threshold can be reasonably set by analyzing and calculating the heat exchange quantity required in the current application scene, the fresh water heat exchange water inlet and outlet temperature difference and the fresh water cooling circulation pump discharge capacity.
According to the control method of the ocean engineering ship cooling system, the flow of the heat exchange bypass pipeline in the ocean engineering ship cooling system is obtained; calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the marine engineering ship cooling system; if the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started; and if the ratio is not less than the preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start. The whole scheme can dynamically adjust the quantity of the started seawater cooling pumps based on the flow of the heat exchange bypass pipeline and a preset bypass flow threshold, avoids energy waste caused by starting the redundant seawater cooling pumps, and can achieve the purpose of energy conservation.
In one embodiment, the control method of the cooling system of the marine engineering ship further includes:
Obtaining the required heat exchange amount and fresh water heat exchange inlet and outlet water temperature difference corresponding to the ocean engineering ship cooling system, and obtaining the fresh water cooling circulation pump displacement in the ocean engineering ship cooling system; and calculating a preset bypass flow threshold according to the required heat exchange amount, the fresh water heat exchange inlet-outlet water temperature difference and the fresh water cooling circulation pump discharge capacity.
The required heat exchange amount needs to consider the heat exchange amount required by constant users and intermittent users in the whole ocean engineering ship under the current application environment. When the intermittent user operates, the required heat exchange amount=constant user required heat exchange amount+intermittent user required heat exchange amount; when the intermittent user is not running, the required heat exchange amount=constant user required heat exchange amount. The fresh water heat exchange inlet and outlet water temperature difference refers to the difference between the fresh water measured inlet water temperature and the fresh water measured outlet water temperature, for example, the fresh water side inlet water temperature is 42 ℃; the outlet temperature of the fresh water side is 36 ℃, and the temperature difference of the inlet water and the outlet water of the fresh water heat exchange is 42 ℃ -36 ℃ =6 ℃. The displacement of the fresh water cooling circulation pump is specifically determined by the fresh water cooling circulation pump, for example, the displacement of the fresh water cooling circulation pump of a certain model is 600m 3/h.
Specifically, the required displacement of the fresh water cooling circulating pump can be calculated based on the required heat exchange amount, the current utilization rate of the fresh water cooling circulating pump can be obtained by calculating the required displacement of the fresh water cooling circulating pump and the displacement (design value) of the fresh water cooling circulating pump, the current utilization rate of the fresh water cooling circulating pump under different working conditions can be further analyzed to reasonably determine the preset bypass flow threshold, 2 sea water cooling pumps can be reasonably selected to be started, and the energy consumption of the whole cooling system is reduced while the heat exchange requirement is met, so that energy conservation is realized.
In one embodiment, calculating the preset bypass flow threshold according to the required heat exchange amount, the fresh water heat exchange water inlet and outlet temperature difference and the fresh water cooling circulation pump displacement includes:
According to the required heat exchange amount, acquiring a first required heat exchange amount corresponding to the non-running time of the intermittent user and a second required heat exchange amount corresponding to the running time of the intermittent user; obtaining corresponding fresh water cooling first demand flow when the intermittent user does not run according to the first demand heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference; according to the second required heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference, the corresponding fresh water cooling second required flow rate during intermittent user operation is obtained; calculating the ratio of the first required fresh water cooling flow to the displacement of the fresh water cooling circulating pump and the ratio of the second required fresh water cooling flow to the displacement of the fresh water cooling circulating pump to obtain a first fresh water cooling utilization rate and a second fresh water cooling utilization rate respectively; a preset bypass flow threshold is determined based on the first fresh water cooling utilization and the second fresh water cooling utilization.
To describe the above process of calculating the preset bypass flow threshold in detail, a description will be made below using a specific application example.
In the application example shown in fig. 2, the heat exchange amount required by a constant user (including but not limited to a chilled water unit, a refrigerating and freezing unit, an instrument air compressor, a nitrogen generator and the like) is 3416kw, and the heat exchange amount required by an intermittent user (including a diesel engine, a generator and an oil return cooler) is 4598kw.
The cooling water system was configured as follows:
A heat exchanger: rated heat exchange capacity 9600kw; rated fresh water side flow rate 1300m 3/h; the rated sea water side flow is 1200m 3/h; the temperature of the fresh water side water inlet is 42 ℃; the outlet temperature of the fresh water side is 36 ℃; the water inlet temperature at the sea water side is 25 ℃; the seawater side outlet temperature was 32 ℃.
Fresh water cooling circulation pump: the displacement is 1200 m 3/h, 2x100%.
Seawater cooling pump: the displacement is 600m 3/h, 3x50%.
More specific parameters are shown in table 1 below.
Table 1 shows specific working condition parameters of marine engineering ship cooling system
The specific calculation process is as follows:
1. When the intermittent user is not running, the required flow = constant user required heat exchange amount (3416 kw 3.6 x 10 x 6)/(fresh water specific heat capacity 4.18 kj/kg ℃ 10 x 3)/(fresh water inlet temperature 42 ℃ to fresh water outlet temperature 36 ℃) per fresh water density 990 kg/m 3.=495.29 m3/h. At this time, the ratio of the demand to the design amount= 495.29 m 3/h of fresh water demand/1200 m 3/h= 41.27% of fresh water cooling circulation pump displacement.
2. When the intermittent user is not running, the required flow = constant user required heat exchange amount (3416 kw 3.6 x 10 x 6)/(sea specific heat capacity 3.95 kj/kg ℃ 10 x 3)/(sea outlet temperature 32 ℃ -sea outlet temperature 25 ℃)/sea density 1023 kg/m 3.=434.76 m3/h. At this time, the ratio of the demand amount to the design amount= 434.76 m 3/h of the sea water demand amount/1200 m 3/h=36.23% of the sea water cooling pump discharge amount.
3. When the intermittent user operates, the required flow rate=the sum of the heat exchange quantity required by the constant user and the intermittent user ((3416+4598) kw 3.6 x10 x 6)/(fresh water specific heat capacity 4.18 kj/kg ℃ 10 x 3)/(fresh water inlet temperature 42 ℃ -fresh water outlet temperature 36 ℃)/fresh water density 990 kg/m 3=1161.95 m3/h. At this time, the ratio of the demand to the design amount= 1161.95 m 3/h/(1200 m 3/h of the fresh water cooling circulation pump displacement+100 m 3/h of the diesel fresh water cooling circulation pump displacement) =89.38%.
4. When the intermittent user is running, the required flow = the sum of the heat exchange amount required by the constant user and the intermittent user ((3416+4598) kw 3.6 x 10 x 6)/(sea water specific heat capacity 3.95 kj/kg°c 10 x 3)/(sea water outlet temperature 32 ℃ -sea water outlet temperature 25 ℃)/sea water density 1023 kg/m 3.=1019.96 m3/h. At this time, the ratio of the demand amount to the design amount= 1019.96 m 3/h of the sea water demand amount/1200 m 3/h=85.00% of the sea water cooling pump discharge amount.
Namely, in the specific application example, the first fresh water cooling utilization rate is 41.27%; the second fresh water cooling utilization rate is 89.38%. And on the basis of obtaining the first fresh water cooling utilization rate and the second fresh water cooling utilization rate, analyzing and determining a preset bypass flow threshold value.
In one embodiment, determining the preset bypass flow threshold based on the first fresh water cooling utilization and the second fresh water cooling utilization includes:
Calculating a difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate; and determining a preset bypass flow threshold according to the difference value of the first fresh water cooling utilization rate and the second fresh water cooling utilization rate.
Specifically, a percentage difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate may be calculated, and then a preset bypass flow threshold may be determined according to the percentage difference. The calculation of the percentage difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate is specifically as follows: 1-a first fresh water cooling utilization rate and 1-a second fresh water cooling utilization rate. I.e. first percentage difference = 1-first fresh water cooling utilisation; second percentage difference = 1-second fresh water cooling utilization. After the first percentage difference and the second percentage difference are obtained, the difference between the first percentage difference and the second percentage difference is calculated, and then a preset bypass flow threshold value is determined. For example, in the above specific application example, the first percentage difference is 1-41.27% = 58.73%; the second percentage difference is 1-89.38% = 10.62%. Then determining a preset bypass flow threshold according to 48.11% of a difference value between 58.73% and 10.62%, specifically, determining the preset bypass flow threshold based on the difference value plus a preset constant as the preset bypass flow threshold, or identifying a difference value interval where the difference value is located, and then determining the preset bypass flow threshold according to a corresponding relation between the preset difference value interval and the bypass flow threshold. In practical application, the difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate can be directly calculated, and then the preset bypass flow threshold value is directly determined based on the difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate. Further, the difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate corresponding to the plurality of scenes can be calculated, and then the preset bypass flow threshold value is reasonably selected. Preferably, the preset bypass flow threshold may be 55%.
In the above specific application example, when the bypass flow threshold is 55%, the flow sensor on the bypass line of the heat exchanger detects that the flow of the passing cooling fresh water is not less than 55% (660 m 3/h), a signal is transmitted to the central control station. The central control station then instructs one of the 2x50% seawater cooling pumps to shut down. At this time, the required cooling seawater flow is 434.76 m 3/h, and the running 1x50% seawater cooling pump 600 m 3/h is not less than 434.76 m 3/h, and still can meet the cooling requirement.
It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a control device of the marine engineering ship cooling system for realizing the control method of the marine engineering ship cooling system. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitations in the embodiments of the control device for the cooling system of the marine engineering vessel provided below can be referred to the limitations of the control method for the cooling system of the marine engineering vessel hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 4, there is provided a control device of the above marine engineering vessel cooling system, comprising:
The parameter obtaining module 420 is used for obtaining the flow of the heat exchange bypass pipeline in the marine engineering ship cooling system;
the calculating module 440 is used for calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of the fresh water cooling circulating pump in the ocean engineering ship cooling system;
The control module 460 is used for controlling 2 seawater cooling pumps in the ocean engineering ship cooling system to start when the ratio is smaller than a preset bypass flow threshold; and when the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
In one embodiment, the control module 460 is further configured to obtain a required heat exchange amount and a fresh water heat exchange inlet and outlet water temperature difference corresponding to the cooling system of the ocean engineering ship, and obtain a fresh water cooling circulation pump displacement in the cooling system of the ocean engineering ship; and calculating a preset bypass flow threshold according to the required heat exchange amount, the fresh water heat exchange inlet-outlet water temperature difference and the fresh water cooling circulation pump discharge capacity.
In one embodiment, the control module 460 is further configured to obtain, according to the required heat exchange amount, a first required heat exchange amount corresponding to the intermittent user when not running, and a second required heat exchange amount corresponding to the intermittent user when running; obtaining corresponding fresh water cooling first demand flow when the intermittent user does not run according to the first demand heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference; according to the second required heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference, the corresponding fresh water cooling second required flow rate during intermittent user operation is obtained; calculating the ratio of the first required fresh water cooling flow to the displacement of the fresh water cooling circulating pump and the ratio of the second required fresh water cooling flow to the displacement of the fresh water cooling circulating pump to obtain a first fresh water cooling utilization rate and a second fresh water cooling utilization rate respectively; a preset bypass flow threshold is determined based on the first fresh water cooling utilization and the second fresh water cooling utilization.
In one embodiment, the control module 460 is further configured to calculate a difference between the first fresh water cooling utilization and the second fresh water cooling utilization; and determining a preset bypass flow threshold according to the difference value of the first fresh water cooling utilization rate and the second fresh water cooling utilization rate.
In one embodiment, the preset bypass flow threshold is 55%.
The above-described respective modules in the control device of the marine engineering vessel cooling system may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 5. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program, when executed by the processor, implements a method of controlling a cooling system of an ocean engineering vessel. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 5 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, the processor implementing the above-described marine engineering vessel cooling system control method when executing the computer program.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, implements the above-described marine engineering vessel cooling system control method.
In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, implements the above-described marine engineering vessel cooling system control method.
Those skilled in the art will appreciate that implementing all or part of the above-described methods may be accomplished by way of a computer program, which may be stored on a non-transitory computer readable storage medium and which, when executed, may comprise the steps of the above-described embodiments of the methods. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (10)
1. The ocean engineering ship cooling system is characterized by comprising at least 2 sea water cooling pumps, a fresh water cooling circulating pump, a heat exchange assembly, a heat exchange bypass pipeline, a flowmeter and a central control assembly;
The at least 2 seawater cooling pumps are connected with the heat exchange assembly, the fresh water cooling circulating pump is connected with the heat exchange assembly, the heat exchange bypass pipeline is connected with the heat exchange assembly in parallel to form a bypass waterway of fresh water circulation, the flowmeter is arranged on the heat exchange bypass pipeline, and the central control assembly is respectively connected with the at least 2 seawater cooling pumps and the flowmeter;
When power is on, the central control component receives bypass flow of the heat exchange bypass pipeline collected by the flowmeter, and if the ratio of the bypass flow to the fresh water cooling circulation pump displacement is smaller than a preset bypass flow threshold, 2 seawater cooling pumps are controlled to be started; and if the ratio of the bypass flow to the fresh water cooling circulation pump displacement is not smaller than a preset bypass flow threshold, controlling the starting of the single sea water cooling pump.
2. The system of claim 1, wherein the preset bypass flow threshold is determined based on a required heat exchange amount, a fresh water heat exchange inlet-outlet water temperature difference, and the fresh water cooling circulation pump displacement.
3. The system of claim 1, wherein the preset bypass flow threshold is 55%.
4. A method of controlling a cooling system of an ocean engineering vessel according to any one of claims 1-3, the method comprising:
Acquiring the flow of a heat exchange bypass pipeline in a marine engineering ship cooling system;
calculating the ratio of the flow of the heat exchange bypass pipeline to the displacement of a fresh water cooling circulating pump in the ocean engineering ship cooling system;
If the ratio is smaller than a preset bypass flow threshold, 2 seawater cooling pumps in the ocean engineering ship cooling system are controlled to be started;
and if the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
5. The method according to claim 4, wherein the method further comprises:
obtaining the required heat exchange amount and fresh water heat exchange inlet and outlet water temperature difference corresponding to an ocean engineering ship cooling system, and obtaining the displacement of a fresh water cooling circulating pump in the ocean engineering ship cooling system;
And calculating a preset bypass flow threshold according to the required heat exchange amount, the fresh water heat exchange inlet-outlet water temperature difference and the fresh water cooling circulation pump displacement.
6. The method of claim 5, wherein calculating a preset bypass flow threshold based on the required heat exchange amount, the fresh water heat exchange inlet-outlet water temperature difference, and the fresh water cooling circulation pump displacement comprises:
Acquiring a first required heat exchange amount corresponding to the non-running time of the intermittent user and a second required heat exchange amount corresponding to the running time of the intermittent user according to the required heat exchange amount;
Obtaining a corresponding first fresh water cooling demand flow when an intermittent user does not run according to the first demand heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference; according to the second required heat exchange amount and the fresh water heat exchange inlet and outlet water temperature difference, corresponding fresh water cooling second required flow rate during intermittent user operation is obtained;
Calculating the ratio of the first required fresh water cooling flow to the displacement of the fresh water cooling circulating pump and the ratio of the second required fresh water cooling flow to the displacement of the fresh water cooling circulating pump to obtain a first fresh water cooling utilization rate and a second fresh water cooling utilization rate respectively;
And determining a preset bypass flow threshold based on the first fresh water cooling utilization rate and the second fresh water cooling utilization rate.
7. The method of claim 6, wherein determining a preset bypass flow threshold based on the first fresh water cooling utilization and the second fresh water cooling utilization comprises:
Calculating a difference between the first fresh water cooling utilization rate and the second fresh water cooling utilization rate;
And determining a preset bypass flow threshold according to the difference value of the first fresh water cooling utilization rate and the second fresh water cooling utilization rate.
8. The method of claim 4, wherein the preset bypass flow threshold is 55%.
9. A control device for a cooling system of an oceanographic engineering vessel according to any one of claims 1-3, characterized in that the device comprises:
the parameter acquisition module is used for acquiring the flow of a heat exchange bypass pipeline in the marine engineering ship cooling system;
the calculating module is used for calculating the ratio of the flow of the heat exchange bypass pipeline to the discharge capacity of the fresh water cooling circulating pump in the ocean engineering ship cooling system;
The control module is used for controlling 2 seawater cooling pumps in the ocean engineering ship cooling system to start when the ratio is smaller than a preset bypass flow threshold value; and when the ratio is not smaller than a preset bypass flow threshold, controlling a single seawater cooling pump in the ocean engineering ship cooling system to start.
10. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 4 to 8 when the computer program is executed.
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