CN109733579B - Ship central cooling water system, control method thereof and ship - Google Patents
Ship central cooling water system, control method thereof and ship Download PDFInfo
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- CN109733579B CN109733579B CN201910164710.0A CN201910164710A CN109733579B CN 109733579 B CN109733579 B CN 109733579B CN 201910164710 A CN201910164710 A CN 201910164710A CN 109733579 B CN109733579 B CN 109733579B
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- 239000000498 cooling water Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000013505 freshwater Substances 0.000 claims abstract description 101
- 239000013535 sea water Substances 0.000 claims abstract description 78
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims description 21
- 230000001276 controlling effect Effects 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 230000033228 biological regulation Effects 0.000 abstract description 2
- 239000010705 motor oil Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000008054 signal transmission Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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Abstract
The invention provides a ship central cooling water system, a control method thereof and a ship, and relates to the technical field of ship cooling water, in particular to a ship central cooling water system which comprises a seawater variable frequency pump set, a fresh water variable frequency pump set, a temperature control three-way valve, a central cooler, a branch pipe assembly, a detection system and a central control system; the running frequencies of the seawater variable frequency power device and the fresh water variable frequency power device are controlled through the central control system, the running powers of the seawater variable frequency pump set and the fresh water variable frequency pump set can be adjusted, the energy-saving technical effect is realized on the basis of meeting the requirements of equipment or coolers required to be cooled by ships, and the technical problems that the seawater cooling water system and the fresh water cooling system cannot be subjected to flow adjustment, so that energy is wasted and the service life of the central cooling water system is reduced in the prior art are solved; the central control system controls the opening value of the temperature control three-way valve, and the opening value is used as a safety guarantee measure for temperature and flow regulation.
Description
Technical Field
The invention relates to the technical field of ship cooling water, in particular to a ship central cooling water system, a control method thereof and a ship.
Background
The central cooling water system of the ship is one of important systems for ensuring the safe and reliable operation of the ship power plant; the traditional cooling water system of the ship consists of a seawater cooling water system and a fresh water cooling system, wherein the fresh water is firstly cooled by utilizing seawater through a central cooler, and then the fresh water is used as a cooling medium to cool other equipment or coolers on the ship, so that the temperature of the whole power system equipment is kept within an effective working range, and stable and normal work is ensured.
In the prior art, in order to ensure that the power system on the ship is always in the safest temperature range, the central cooling water system of the ship is required to be operated at full power all the time.
However, in the running process of the ship, other configuration devices of the system are always in the maximum power running, the service life of the system can be reduced, and the defects of high energy consumption and low utilization rate of the central cooling water system of the ship in the prior art are caused.
Disclosure of Invention
The invention aims to provide a ship central cooling water system, a control method thereof and a ship, so as to solve the technical problems of low service life and high energy consumption of the central cooling water system in the prior art.
The invention provides a ship central cooling water system, which comprises: the device comprises a seawater variable frequency pump set, a fresh water variable frequency pump set, a temperature control three-way valve, a central cooler, a branch pipe assembly, a detection system and a central control system;
the outlet end of the central cooler is communicated with the inlet end of the fresh water variable frequency pump set through the temperature control three-way valve, the outlet end of the fresh water variable frequency pump set is communicated with the inlet end of the branch pipe assembly, and the outlet end of the branch pipe assembly is respectively communicated with the central cooler and the temperature control three-way valve, so that cooling water in the branch pipe assembly can respectively enter the central cooler and the fresh water variable frequency pump set;
the fresh water variable frequency pump set is provided with a fresh water variable frequency power device, the sea water variable frequency pump set is provided with a sea water variable frequency power device, and the central control system is respectively and electrically connected with the fresh water variable frequency power device and the sea water variable frequency power device;
the detection system is electrically connected with the central control system, and is used for detecting the temperature of cooling water at the outlet end of the central cooler and the pressure at the outlet end of the branch pipe assembly, transmitting the temperature and pressure information to the central control system, and correspondingly controlling the operating frequencies of the seawater variable-frequency power device and the freshwater variable-frequency power device by the central control system;
the temperature control three-way valve is electrically connected with the central control system, the central control system is used for controlling the opening degree of the temperature control three-way valve, and the control instruction of the central control system on the fresh water variable frequency power device and the seawater variable frequency power device is higher than the control instruction on the temperature control three-way valve.
In a preferred embodiment of the invention, the detection system comprises a first sensor and a second sensor;
the first sensor and the second sensor are electrically connected with the central control system, the first sensor is arranged at the outlet end of the central cooler and is used for detecting temperature information at the outlet end of the central cooler and transmitting the first temperature information to the central control system, and the central control system correspondingly controls the running frequency of the seawater variable-frequency power device;
the second sensor is arranged at the outlet end of the branch pipe assembly and is used for detecting pressure information at the outlet end of the branch pipe assembly and transmitting the pressure information to the central control system, and the central control system correspondingly controls the running frequency of the fresh water variable frequency power device.
In a preferred embodiment of the present invention, the central control system is preset with a temperature threshold and a pressure threshold, and when the temperature information is smaller than the temperature threshold and/or the pressure information is smaller than the pressure threshold, the central control system correspondingly controls the opening of the temperature control three-way valve.
In a preferred embodiment of the present invention, a third sensor is further included; the third sensor is arranged at the outlet end of the branch pipe assembly, which is close to the cooled equipment, and is used for detecting the temperature information of the cooling liquid at the outlet end of the cooled equipment and transmitting the temperature information to the central control system, and the central control system correspondingly controls the running frequency of the freshwater variable frequency power device.
In a preferred embodiment of the invention, the device further comprises a branch pipe regulating valve;
the branch pipe regulating valve is arranged between the branch pipe assembly and the central cooler, and is communicated with the branch pipe assembly and used for regulating the flow in the branch pipe assembly.
In a preferred embodiment of the present invention, the branch pipe assembly includes a plurality of branch pipes;
each branch pipe is communicated with a corresponding cooler respectively.
The invention provides a ship, which comprises the ship central cooling water system.
The invention provides a control method of a ship central cooling water system, which comprises the following steps:
the preset seawater variable-frequency pump unit and the freshwater variable-frequency pump unit are operated at the minimum frequency;
presetting the opening of a temperature control three-way valve to be the maximum value;
receiving temperature information of cooling water conveyed by a central cooler to a fresh water variable frequency pump set;
according to the temperature information, the central control system correspondingly controls the operating frequency of the seawater variable frequency pump set;
receiving pressure information of cooling water flowing out of the branch pipe assembly;
according to the pressure information, the central control system correspondingly controls the running frequency of the fresh water variable frequency pump set;
when the seawater variable frequency pump set and the freshwater variable frequency pump set both run at the minimum running frequency, and the detected temperature information and/or pressure information is smaller than the temperature threshold value and/or the pressure threshold value of the ship in the required running state, the hollow control system controls the opening value of the temperature control three-way valve.
In a preferred embodiment of the present invention, the method further comprises the steps of:
receiving basic information of load operation of a host in a ship operation state;
receiving control information of host load operation of ship speed increasing, speed decreasing or constant speed;
according to the comparison of the control information and the basic information, controlling the running frequency of the seawater variable frequency pump set before the load of the host machine is regulated;
the control instruction of the central control system for the seawater variable frequency pump set according to the running state of the ship is higher than the control instruction of the central control system for the seawater variable frequency pump set according to the temperature information of the cooling water conveyed by the fresh water variable frequency pump set.
In a preferred embodiment of the present invention, the central control system is provided with a manual control interface, and the central control system can receive information of the human-computer interface to control the running frequency of the fresh water variable-frequency pump unit and the seawater variable-frequency pump unit, or control the opening value of the temperature control three-way valve.
The embodiment of the invention has the beneficial effects that:
the invention provides a ship central cooling water system, which comprises: the device comprises a seawater variable frequency pump set, a fresh water variable frequency pump set, a temperature control three-way valve, a central cooler, a branch pipe assembly, a detection system and a central control system; under the condition that the central control system controls the running frequency of the seawater variable frequency power device and the fresh water variable frequency power device, the opening of the temperature control three-way valve is always the maximum opening, and when the central control system controls the seawater variable frequency pump set and the fresh water variable frequency pump set to run at the minimum running frequency and still cannot meet the running state of the ship, the central control system controls the opening value of the temperature control three-way valve at the moment and adjusts the flow as a safety guarantee measure.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic view of a branch pipe assembly of a central cooling water system for a ship according to an embodiment of the present invention, which has a branch pipe adjusting valve;
fig. 2 is a schematic structural diagram of a central cooling water system for a ship according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the overall structure of a central cooling water system for a ship according to an embodiment of the present invention;
fig. 4 is a control logic block diagram of a freshwater variable frequency pump set of a control method of a ship central cooling water system provided by an embodiment of the invention;
FIG. 5 is a control logic block diagram of a seawater variable frequency pump set of a control method of a ship central cooling water system provided by the embodiment of the invention;
fig. 6 is a control logic block diagram of a temperature control three-way valve of a control method of a ship central cooling water system according to an embodiment of the present invention.
Icon: 100-seawater variable frequency pump set; 101-a seawater variable frequency power device; 200-fresh water variable frequency pump unit; 201-a fresh water variable frequency power device; 300-a temperature control three-way valve; 400-a central cooler; 500-branch pipe assembly; 600-a detection system; 601-a first sensor; 602-a second sensor; 800-a pressure detection device; 900-expansion tank; 110-sea chest; 120-branch pipe regulating valve.
Detailed Description
As shown in fig. 1 to 6, the present embodiment provides a central cooling water system for a ship, comprising: the system comprises a seawater variable frequency pump set 100, a fresh water variable frequency pump set 200, a temperature control three-way valve 300, a central cooler 400, a branch pipe assembly 500, a detection system 600 and a central control system; the seawater variable frequency pump set 100 is communicated with the central cooler 400, the outlet end of the central cooler 400 is communicated with the inlet end of the fresh water variable frequency pump set 200 through the temperature control three-way valve 300, the outlet end of the fresh water variable frequency pump set 200 is communicated with the inlet end of the branch pipe assembly 500, and the outlet end of the branch pipe assembly 500 is respectively communicated with the central cooler 400 and the temperature control three-way valve 300, so that cooling water in the branch pipe assembly 500 can respectively enter the central cooler 400 and the fresh water variable frequency pump set 200; the fresh water variable frequency pump set 200 is provided with a fresh water variable frequency power device 201, the sea water variable frequency pump set 100 is provided with a sea water variable frequency power device 101, and the central control system is respectively and electrically connected with the fresh water variable frequency power device 201 and the sea water variable frequency power device 101.
Further, the detecting system 600 is electrically connected to a central control system, and the detecting system 600 is used for detecting the temperature of the cooling water at the outlet end of the central cooler 400 and the pressure at the outlet end of the branch pipe assembly 500, and transmitting the temperature and pressure information to the central control system, where the central control system correspondingly controls the operation frequencies of the seawater variable frequency power device 101 and the freshwater variable frequency power device 201; the temperature control three-way valve 300 is electrically connected with a central control system, the central control system is used for controlling the opening degree of the temperature control three-way valve 300, and the control command of the central control system for the fresh water variable frequency power device 201 and the seawater variable frequency power device 101 is higher than the control command for the temperature control three-way valve 300.
The central control system is used as a control system of the ship, and all control modes of the ship central cooling water system provided by the embodiment are known by a person skilled in the art based on the internal control system of the existing ship, and the embodiment is directed to structural improvement of the ship central cooling water system, so that the model and the structure of the central control system are not repeated here.
As the main body of the variable frequency control, the seawater variable frequency power device 101 and the fresh water variable frequency power device 201 of the seawater variable frequency pump set 100 and the fresh water variable frequency pump set 200 are respectively provided with a frequency converter.
Optionally, the central control system may be electrically connected to the seawater variable frequency pump unit 100, the fresh water variable frequency pump unit 200 and the temperature control three-way valve 300 in various manners, for example: wireless signal transmission or wired signal transmission, etc., preferably, the electric connection mode between the central control system and the seawater variable frequency pump set 100, the freshwater variable frequency pump set 200 and the temperature control three-way valve 300 is wireless signal transmission, and preferably, the wireless signal transmission mode is local area network control signal transmission.
Preferably, the temperature-controlled three-way valve 300 is an electromagnetic temperature-controlled three-way valve 300, and the electromagnetic temperature-controlled three-way valve 300 operates in various modes, for example: one-in two-out, two-in one-out or one-in one-out operation mode.
The number of the central coolers 400 can be two, and each central cooler 400 can comprise a titanium plate central cooler 400 with pressure, temperature instruments and air release facilities, and the heat exchange cavity of each central cooler 400 is 50% of the total heat exchange quantity; based on the calculation of the heat load of the system, two central coolers 400 are configured according to the total heat dissipation capacity of each device in the system under the full load working condition, each central cooler accounts for 50% of the total heat dissipation capacity, the calculated value of each heat dissipation capacity is obtained, and the efficient central cooler 400 matched with the current ship system can be determined according to the full load disclosure parameters and the pressure drop of the pipelines and the coolers of the branch pipe assembly 500.
The embodiment provides a boats and ships central cooling water system, includes: the system comprises a seawater variable frequency pump set 100, a fresh water variable frequency pump set 200, a temperature control three-way valve 300, a central cooler 400, a branch pipe assembly 500, a detection system 600 and a central control system; the seawater variable frequency pump set 100 and the fresh water variable frequency pump set 200 are respectively adopted by the seawater variable frequency power device 101 and the fresh water variable frequency power device 201, based on a central control system in the ship, the temperature of cooling water output by the central cooler 400 and the pressure information of equipment or a branch pipe assembly 500 of the cooler to be cooled can be detected in real time, the operating frequencies of the seawater variable frequency power device 101 and the fresh water variable frequency power device 201 are controlled by the central control system, the operating power of the seawater variable frequency pump set 100 and the fresh water variable frequency pump set 200 can be regulated, the energy-saving technical effect is realized on the basis of meeting the requirements of equipment or the cooler to be cooled by the ship, and the technical problems that the flow regulation cannot be performed by a seawater cooling water system and a fresh water cooling system in the prior art, the energy waste is caused, and the service life of the central cooling water system is reduced are solved.
Moreover, in the case that the central control system controls the operation frequencies of the seawater variable frequency power unit 101 and the freshwater variable frequency power unit 201, the opening of the temperature control three-way valve 300 is always the maximum opening, and when the central control system still cannot meet the operation state of the ship in the state that the central control system controls the seawater variable frequency pump unit 100 and the freshwater variable frequency pump unit 200 to operate at the minimum operation frequency, the central control system controls the opening value of the temperature control three-way valve 300 at this time, and the opening value is adjusted as a safety guarantee measure.
Based on the above embodiments, in a preferred embodiment of the present invention, the detection system 600 includes a first sensor 601 and a second sensor 602; the first sensor 601 and the second sensor 602 are electrically connected with a central control system, the first sensor 601 is arranged at the outlet end of the central cooler 400 and is used for detecting temperature information at the outlet end of the central cooler and transmitting the first temperature information to the central control system, and the central control system correspondingly controls the running frequency of the seawater variable frequency power device 101; the second sensor 602 is disposed at an outlet end of the branch pipe assembly 500, and is configured to detect pressure information thereof, and transmit the pressure information to a central control system, where the central control system correspondingly controls the operating frequency of the freshwater variable frequency power device 201.
Alternatively, the first sensor 601 is configured as a temperature sensor, the second sensor 602 is configured as a pressure sensor, and the number of the first sensors 601 may be specifically configured according to the plurality of pipes of the central cooler 400, and the number of the pressure sensors may be specifically configured according to the number of branch pipes and the collection pipe.
In a preferred embodiment of the present invention, the central control system is preset with a temperature threshold and a pressure threshold, and when the temperature information is smaller than the temperature threshold and/or the pressure information is smaller than the pressure threshold, the central control system correspondingly controls the opening of the temperature control three-way valve 300.
Because different ship internal systems have different numerical settings, specific setting can be performed on preset temperature thresholds and pressure thresholds according to national standard requirements for different ships.
In this embodiment, the temperature control three-way valve 300 is used as a protection measure, and the central control system determines that the demands of the branch pipe assembly 500 and the equipment to be cooled cannot be met by the seawater variable frequency pump unit 100 and the freshwater variable frequency pump unit 200, and the judgment basis of the central control system is based on the comparison of the temperature information and the temperature threshold value or the comparison of the pressure information and the pressure threshold value.
In a preferred embodiment of the present invention, a third sensor is further included; the branch pipe assembly 500 is communicated with the cooled equipment, and the third sensor is arranged at the outlet end of the branch pipe assembly 500, close to the cooled equipment, and is used for detecting the temperature information of the cooling liquid at the outlet end of the cooled equipment, and transmitting the temperature information to the central control system, and the central control system correspondingly controls the running frequency of the fresh water variable frequency power device 201.
Preferably, the third sensors may be temperature sensors, and the number of the third sensors may be specifically set according to the cooled equipment to which each branch pipe is connected and the manner of setting one more on the collecting main.
In the preferred embodiment of the present invention, a manifold regulator valve 120 is also included; the branch pipe adjusting valve 120 is disposed between the branch pipe assembly 500 and the central cooler 400, and the branch pipe adjusting valve 120 communicates with the branch pipe assembly 500 for adjusting the flow rate inside the branch pipe assembly 500.
In a preferred embodiment of the present invention, the manifold assembly 500 includes a plurality of branch manifolds; each branch pipe is communicated with a corresponding cooler respectively; specifically, the devices for communicating branch pipes comprise a main engine air cooler, a main engine oil nozzle cooler, a gear box oil cooler, an adjustable-pitch hydraulic oil cooler, an intermediate bearing and a plurality of cooling fresh water users, and a plurality of branch pipes are assembled into a main pipeline to be communicated with the fresh water variable frequency pump set 200.
In the preferred embodiment of the present invention, a plurality of branch regulating valves 120 are provided, and the plurality of branch regulating valves 120 are respectively communicated with the engine oil cooler, the high temperature cooler and the atmospheric condenser.
In a preferred embodiment of the present invention, the engine oil cooler, the high temperature cooler and the atmospheric condenser are respectively provided with pressure sensors, each of which is electrically connected with the central control system, each of which respectively detects the pressure information of the engine oil cooler, the high temperature cooler or the atmospheric condenser and transmits the pressure information to the central control system, and the central control system correspondingly controls the opening of the branch pipe regulating valve 120 on the engine oil cooler, the high temperature cooler or the atmospheric condenser.
The opening degree of the branch pipe regulating valve 120 is automatically regulated according to the requirements of users of different cooling water, such as a main engine oil cooler, a high-temperature cooler and a pressure sensor in an atmospheric condenser, so that the waste of the cooling water on equipment which does not need cooling is avoided, and the design has particularly obvious effect on high-consumption equipment of the cooling water; taking the branch pipe of the atmospheric condenser as an example, a branch pipe regulating valve 120 is additionally arranged at the branch pipe of the atmospheric condenser, and the branch pipe regulating valve 120 is regulated according to the outlet water temperature of the atmospheric condenser or the outlet pressure of the steam of the boiler, so that the flow rate of cooling fresh water flowing through the atmospheric condenser is controlled, the cooling water resource is saved, and meanwhile, the ship steam system is operated under a reasonable design working condition.
In this embodiment, the central cooler 400, the fresh water variable frequency pump set 200 and the branch pipe assembly 500 form a closed fresh water system, fresh water cooled by the central cooler 400 enters the fresh water variable frequency pump set 200 from the fresh water expansion tank 900 with a liquid level switch and a low-level alarm function through the fresh water main pipe, and enters the user ends of the ship which need cooling after further fine adjustment of the fresh water, wherein the branch pipe of the branch pipe assembly 500 mainly enters the following user ends, and the cooled fresh water enters the auxiliary air cooler and the auxiliary lubricating oil cooler to cool the air and the lubricating oil of the auxiliary machine, so that the air and the lubricating oil are in an effective working range, and the auxiliary machine equipment can be ensured to work normally; the cooled fresh water also enters an intermediate bearing, a main engine air cooler, a main engine lubricating oil cooler and a main engine cylinder sleeve water cooler, and a branch pipe regulating valve 120 at the fresh water outlet of the main engine air cooler and the main engine cylinder sleeve water cooler is optimized to be a self-operated regulating valve, so that automatic control is realized; the cooling fresh water flows through the middle bearing for protection, the main engine air device and the main engine oil cooler respectively, and the fresh water flows through the main engine oil cooler and then enters the main engine cylinder sleeve water cooler for cooling the main engine high-temperature cylinder sleeve water, so that the stable operation of each device is ensured; the cooled fresh water also enters a host air compressor, a centralized control room air conditioner, a kitchen air conditioner, an air conditioner compressor condenser and a refrigeration compressor; the branch pipe regulating valve 120 at the fresh water outlet of the condenser of the air conditioner compressor is optimized to be a self-operated regulating valve, so that automatic control is realized, and the cooled fresh water flows through the equipment to enable the equipment to normally and stably operate.
The embodiment also provides a ship, which comprises the ship central cooling water system; because the technical effects of the ship provided in this embodiment are the same as those of the ship central cooling water system provided in the above embodiment, the description thereof will not be repeated here.
The embodiment also provides a control method of the ship central cooling water system, which is based on the ship central cooling water system provided by the embodiment of the invention, and the specific method comprises the following steps: the preset seawater variable frequency pump unit 100 and the fresh water variable frequency pump unit 200 are operated at the minimum frequency; presetting the opening of the temperature control three-way valve 300 to be the maximum value; receiving temperature information of cooling water conveyed by the central cooler 400 to the fresh water variable frequency pump set 200; according to the temperature information, the central control system correspondingly controls the operating frequency of the seawater variable frequency pump set 100; receiving pressure information of the cooling water flowing out of the branch pipe assembly 500; according to the pressure information, the central control system correspondingly controls the operating frequency of the fresh water variable frequency pump set 200; when the seawater variable frequency pump unit 100 and the freshwater variable frequency pump unit 200 are operated at the minimum operation frequency and the detected temperature information and/or pressure information is less than the temperature threshold and/or pressure threshold of the ship in the operation state required, the hollow control system controls the opening value of the temperature control three-way valve 300.
In a preferred embodiment of the invention, basic information of the load operation of a host in the running state of the ship is received; receiving control information of host load operation of ship speed increasing, speed decreasing or constant speed; according to the comparison of the control information and the basic information, the operating frequency of the seawater variable frequency pump set 100 is controlled before the host load is adjusted; the control command of the central control system to the seawater variable frequency pump unit 100 according to the running state of the ship is prioritized over the control command of the seawater variable frequency pump unit 100 according to the temperature information of the cooling water conveyed by the fresh water variable frequency pump unit 200.
The control method of the ship central cooling water system of the embodiment is based on the design environment of the ship central cooling water system provided by the embodiment of the invention, and the control judgment based on the ship running state is added besides the real-time transmission information according to the detection system 600; taking the lifting of the host load as an example, when the host load is lifted from 30% to 80%, the information is transmitted to the central control system, the central control system sends a signal to the variable frequency controller in the seawater variable frequency pump set 100, and the variable frequency controller in the seawater variable frequency pump set 100 firstly lifts the rotating speed of the seawater variable frequency pump set 100 according to the signal before the lifting of the host load until the signal disappears, and then adjusts the rotating speed of the seawater variable frequency pump set 100 according to the signal of the detection system 600 again.
In a preferred embodiment of the present invention, the central control system is provided with a manual control interface, and the central control system can receive information of the human-computer interface to control the operation frequency of the freshwater variable frequency pump unit 200 and the seawater variable frequency pump unit 100, or control the opening value of the temperature control three-way valve 300.
According to the control method of the ship central cooling water system, the control priority of the seawater variable-frequency pump set 100, the fresh water variable-frequency pump set 200 and the temperature control three-way valve 300 is adjusted, the system adjusting function can be achieved, after the temperature of cooling water output by the central cooler 400 and the pressure information of equipment needing cooling or a branch pipe assembly 500 of the cooler are detected in real time, the operation frequencies of the seawater variable-frequency power device 101 and the fresh water variable-frequency power device 201 are controlled through the central control system, the operation power of the seawater variable-frequency pump set 100 and the fresh water variable-frequency pump set 200 can be adjusted, the energy saving technical effect is achieved on the basis of meeting the requirements of equipment needing cooling of a ship or the cooler, and the technical problems that the seawater cooling water system and the fresh water cooling system cannot be subjected to flow adjustment in the prior art, energy waste is caused, and the service life of the central cooling water system is reduced are solved.
Moreover, in the case that the central control system controls the operation frequencies of the seawater variable frequency power unit 101 and the freshwater variable frequency power unit 201, the opening of the temperature control three-way valve 300 is always the maximum opening, and when the central control system still cannot meet the operation state of the ship in the state that the central control system controls the seawater variable frequency pump unit 100 and the freshwater variable frequency pump unit 200 to operate at the minimum operation frequency, the central control system controls the opening value of the temperature control three-way valve 300 at this time, and the opening value is adjusted as a safety guarantee measure.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A marine central cooling water system, comprising: the device comprises a seawater variable frequency pump set, a fresh water variable frequency pump set, a temperature control three-way valve, a central cooler, a branch pipe assembly, a detection system and a central control system;
the outlet end of the central cooler is communicated with the inlet end of the fresh water variable frequency pump set through the temperature control three-way valve, the outlet end of the fresh water variable frequency pump set is communicated with the inlet end of the branch pipe assembly, and the outlet end of the branch pipe assembly is respectively communicated with the central cooler and the temperature control three-way valve, so that cooling water in the branch pipe assembly can respectively enter the central cooler and the fresh water variable frequency pump set;
the fresh water variable frequency pump set is provided with a fresh water variable frequency power device, the sea water variable frequency pump set is provided with a sea water variable frequency power device, and the central control system is respectively and electrically connected with the fresh water variable frequency power device and the sea water variable frequency power device;
the detection system is electrically connected with the central control system, and is used for detecting the temperature of cooling water at the outlet end of the central cooler and the pressure at the outlet end of the branch pipe assembly, transmitting the temperature and pressure information to the central control system, and correspondingly controlling the operating frequencies of the seawater variable-frequency power device and the freshwater variable-frequency power device by the central control system;
the temperature control three-way valve is electrically connected with the central control system, the opening of the temperature control three-way valve can be controlled by the central control system, and control instructions of the central control system on the fresh water variable frequency power device and the seawater variable frequency power device are prioritized over control instructions of the temperature control three-way valve;
the method comprises the following steps: the preset seawater variable-frequency pump unit and the freshwater variable-frequency pump unit are operated at the minimum frequency;
presetting the opening of a temperature control three-way valve to be the maximum value;
receiving temperature information of cooling water conveyed by a central cooler to a fresh water variable frequency pump set;
according to the temperature information, the central control system correspondingly controls the operating frequency of the seawater variable frequency pump set;
receiving pressure information of cooling water flowing out of the branch pipe assembly;
according to the pressure information, the central control system correspondingly controls the running frequency of the fresh water variable frequency pump set;
when the seawater variable frequency pump set and the freshwater variable frequency pump set both run at the minimum running frequency and the detected temperature information and/or pressure information is smaller than the temperature threshold value and/or the pressure threshold value of the ship in the required running state, the hollow control system controls the opening value of the temperature control three-way valve;
the method also comprises the following steps: receiving basic information of load operation of a host in a ship operation state;
receiving control information of host load operation of ship speed increasing, speed decreasing or constant speed;
according to the comparison of the control information and the basic information, controlling the running frequency of the seawater variable frequency pump set before the load of the host machine is regulated;
the control instruction of the central control system for the seawater variable frequency pump set according to the running state of the ship is higher than the control instruction of the central control system for the seawater variable frequency pump set according to the temperature information of the cooling water conveyed by the fresh water variable frequency pump set.
2. The marine central cooling water system of claim 1, wherein the detection system comprises a first sensor and a second sensor;
the first sensor and the second sensor are electrically connected with the central control system, the first sensor is arranged at the outlet end of the central cooler and is used for detecting temperature information at the outlet end of the central cooler and transmitting the first temperature information to the central control system, and the central control system correspondingly controls the running frequency of the seawater variable-frequency power device;
the second sensor is arranged at the outlet end of the branch pipe assembly and is used for detecting pressure information at the outlet end of the branch pipe assembly and transmitting the pressure information to the central control system, and the central control system correspondingly controls the running frequency of the fresh water variable frequency power device.
3. The ship central cooling water system according to claim 2, wherein the central control system is preset with a temperature threshold value and a pressure threshold value, and when the temperature information is smaller than the temperature threshold value and/or the pressure information is smaller than the pressure threshold value, the central control system correspondingly controls the opening degree of the temperature control three-way valve.
4. A marine central cooling water system as claimed in any of claims 1 to 3, further comprising a third sensor;
the third sensor is arranged at the outlet end of the branch pipe assembly, which is close to the cooled equipment, and is used for detecting the temperature information of the cooling liquid at the outlet end of the cooled equipment and transmitting the temperature information to the central control system, and the central control system correspondingly controls the running frequency of the freshwater variable frequency power device.
5. The marine central cooling water system of claim 4, further comprising a manifold regulator valve;
the branch pipe regulating valve is arranged between the branch pipe assembly and the central cooler, and is communicated with the branch pipe assembly and used for regulating the flow in the branch pipe assembly.
6. The marine central cooling water system of claim 5, wherein the manifold assembly comprises a plurality of branching manifolds;
each branch pipe is communicated with a corresponding cooler respectively.
7. The ship central cooling water system according to claim 1, wherein the central control system is provided with a manual control interface, and the central control system can receive information of a human-computer interface to control the operating frequency of the fresh water variable frequency pump unit, the seawater variable frequency pump unit or control the opening value of the temperature control three-way valve.
8. A vessel comprising a central cooling water system of the vessel according to any one of claims 1-7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110539870A (en) * | 2019-09-25 | 2019-12-06 | 中国船舶重工集团公司第七一九研究所 | Self-flowing cooling system and ship |
| CN110745229A (en) * | 2019-11-26 | 2020-02-04 | 南通旭日船用机械有限公司 | Plate cooler seawater frequency conversion control method and system |
| CN110906765A (en) * | 2019-12-03 | 2020-03-24 | 南通旭日船用机械有限公司 | Fresh water frequency conversion control method and system for plate cooler |
| CN112572752A (en) * | 2020-11-27 | 2021-03-30 | 沪东中华造船(集团)有限公司 | Frequency conversion energy-saving method for marine seawater cooling pump |
| CN113602467A (en) * | 2021-07-21 | 2021-11-05 | 中国船舶重工集团公司第七一九研究所 | Ship cooling system |
| CN114572372A (en) * | 2022-02-18 | 2022-06-03 | 中国船舶重工集团公司第七一九研究所 | Ship constant-frequency pump cooling system, control method thereof, electronic device and storage medium |
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