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CN111322778B - Marine generator cooling system and control system - Google Patents

Marine generator cooling system and control system Download PDF

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Publication number
CN111322778B
CN111322778B CN202010185053.0A CN202010185053A CN111322778B CN 111322778 B CN111322778 B CN 111322778B CN 202010185053 A CN202010185053 A CN 202010185053A CN 111322778 B CN111322778 B CN 111322778B
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China
Prior art keywords
generator
air
branch
valve
cooling
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CN202010185053.0A
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Chinese (zh)
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CN111322778A (en
Inventor
马强
刘刚
郭俊杰
徐海东
张少君
刘新建
王连海
张业威
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Shandong Jiaotong University
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Shandong Jiaotong University
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Priority to CN202010185053.0A priority Critical patent/CN111322778B/en
Publication of CN111322778A publication Critical patent/CN111322778A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00Compression machines, plants or systems with non-reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/02Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/14Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
    • H02K9/18Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The invention relates to a cooling system and a control system of a marine generator, which comprise an air branch and an emergency branch, wherein the cooling system can be used for cooling only by using normal-temperature air in the atmosphere through the air branch under normal and medium-low loads; the emergency branch circuit adopts compression refrigeration cycle to obtain gaseous working medium with extremely low temperature, and when the generator is in serious cooling problem, the emergency branch circuit is opened to carry out emergency cooling on the generator, so that the cooling effect is greatly improved; meanwhile, media of the air branch and the emergency branch are mutually isolated and independent, cooled working media can be recycled and circulated, and the cooling effect of the emergency branch is improved. Advantageously, the control system is able to activate the emergency branch beforehand, by monitoring the current of the generator, better cooling and lowering the temperature of the generator. Compared with the prior art, the generator overheating prevention device can effectively, efficiently, quickly and automatically prevent the generator overheating.

Description

Marine generator cooling system and control system
Technical Field
The invention relates to the field of generator cooling, in particular to an emergency cooling system and a control system of a marine generator.
Background
The existing ships are developing towards large-scale and multi-functional directions, more and more equipment are arranged on the ships, and the power of the equipment is also increased, so that the integral power consumption of the ships is increased more and more, and a generator with higher power is required to be adopted. The cooling problem of the generator is more prominent due to the fact that the power of the generator is larger and larger; particularly, when the devices, especially the power devices, on the ship are intensively started in a short time or the electrical devices or the electrical lines are short-circuited, the power of the generator is greatly increased in a short time, the heat generation amount in the generator is greatly increased instantaneously, which poses a serious challenge to the cooling of the generator, and severe situations such as coil fusing or stator melting of the generator may occur in a serious situation.
Therefore, how to make the generator cope with such severe situations and prevent the occurrence of overheating is a problem to be solved in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a cooling system and a control system of a marine generator, wherein the cooling system comprises an emergency branch, the emergency branch comprises a compressor, a cooler, a pressure tank, an electric control valve, an expansion valve, an emergency branch air inlet valve and an emergency branch air outlet valve, the compressor, the cooler, the pressure tank, the electric control valve and the expansion valve are sequentially connected, the inlet of the compressor is connected with the emergency branch air outlet valve, the outlet of the expansion valve is connected with the emergency branch air inlet valve, the emergency branch air inlet valve is connected to the air inlet of the generator, the emergency branch air outlet valve is connected to the air outlet of the generator, the cooling system further comprises a generator air inlet temperature sensor, a generator air outlet temperature sensor and a controller, the generator air inlet temperature sensor is installed at the air inlet of the generator, the generator air outlet temperature sensor, the controller is connected with the compressor, the electric control valve, the emergency branch air inlet valve, the emergency branch air outlet valve, the generator air inlet temperature sensor and the generator air outlet temperature sensor.
Further, the cooling system further comprises an air branch which comprises an air branch air inlet valve and an air branch air outlet valve, wherein the air branch air inlet valve is connected to the air inlet of the generator, and the air branch air outlet valve is connected to the air outlet of the generator, so that the generator can suck air from the atmosphere for cooling, and then the cooled air is discharged to the atmosphere.
Further, the air branch inlet valve and the air branch outlet valve are connected to the controller.
Further, the cooling system further comprises a heat exchanger, a heat exchanger cooling passage inlet valve and a heat exchanger cooling passage outlet valve, the heat exchanger cooling passage inlet valve is connected between the expansion valve and the emergency branch air inlet valve, the heat exchanger cooling passage outlet valve is connected between the emergency branch air outlet valve and the compressor, the heat exchanger is connected to the atmosphere through a cooling passage inlet, and the heat exchanger is connected to the air branch air inlet valve through a cooling passage outlet.
Further, the working medium in the emergency branch is carbon dioxide and/or nitrogen.
Further, the compressor is a piston compressor, a screw compressor or a turbo compressor.
Further, the cooler adopts deep seawater to cool the compressed working medium.
Further, the seawater for cooling enters the cooler through the regulating valve.
Further, the output current of the generator is connected to a controller.
The invention also provides a control system of the cooling system of the marine generator, which utilizes the cooling system of the marine generator in the invention, the control system comprises a controller in the cooling system, the controller is connected to a compressor, an electric control valve, an emergency branch air inlet valve, an emergency branch air outlet valve, a generator air inlet temperature sensor, a generator air outlet temperature sensor, a heat exchanger cooling passage inlet valve, a heat exchanger cooling passage outlet valve, an air branch air inlet valve and an air branch air outlet valve, and the controller also receives current parameters of the generator.
The controller judges the calorific capacity and the cooling demand of the generator according to the air inlet temperature and the air outlet temperature of the generator, and when the large and quick heat increase occurs, the control air enters the generator through the heat exchanger, or an emergency branch is adopted to emergently cool the generator, or the emergency branch and the air are adopted to cool the generator simultaneously.
It is further advantageous to activate the emergency branch by receiving current data of the generator, in particular transient currents. The controller regulates the compressor and the electronically controlled valve to a maximum state when the value of the transient current, the transient current ramp rate, and the duration of the transient current all exceed a threshold value.
The implementation of the invention has the following beneficial effects: through the cooling system and the control system, only normal-temperature air in the atmosphere is used for cooling under normal conditions; when the generator is in serious cooling problem, an emergency branch is started, the emergency branch adopts a compression cycle principle to generate gaseous working medium with extremely low temperature and inputs the gaseous working medium into the generator to emergently cool the generator, so that the cooling effect is greatly improved; meanwhile, the cooled working medium can be recovered and circulated, and the cooling effect of the emergency branch is improved. Advantageously, by monitoring the current of the generator, the emergency branch can be activated beforehand, better cooling and lowering the temperature of the generator. Compared with the prior art, the generator overheating prevention device can effectively, efficiently, quickly and automatically prevent the generator overheating.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a block diagram of a cooling system of a marine generator according to the present invention.
Fig. 2 is a structural view of a cooling system of a marine generator according to another embodiment of the present invention.
Wherein: 1. a generator; 2. a compressor; 3. a cooler; 4. a pressure tank; 5. an electrically controlled valve; 6. an expansion valve; 7. an air inlet of the generator; 8. an air outlet of the generator; 9. an air inlet temperature sensor of the generator; 10. an air outlet temperature sensor of the generator; 11. an emergency branch air inlet valve; 12, an emergency branch air outlet valve; 13, an air inlet valve of an air branch; an air branch air outlet valve; a heat exchanger cooling passage inlet valve; a heat exchanger cooling passage outlet valve; a heat exchanger.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention provides a cooling system and a control system of a marine generator.
As shown in fig. 1, a stator and a rotor of a generator, not shown in the figures, are arranged in a housing of the generator 1, wherein the stator is fixedly arranged on a generator housing, and the stator comprises a stator winding and a stator core; the rotor is disposed inside the housing in a manner to rotate relative to the stator, and includes a rotor core and a rotor winding. The rotor is connected with an external power machine, the power machine drives the rotor of the generator to rotate relative to the stator of the generator, under the action of an excitation magnetic field, the stator winding cuts magnetic induction lines of the magnetic field, electromagnetic induction generates electricity, and mechanical energy transmitted to the rotor by the power machine is converted into electric energy.
The casing of generator 1 includes generator air intake 7 and generator air outlet 8, and cooling is with gaseous from generator air intake 7 entering generator 1 casing, and cooling is with gaseous stator core, stator winding, rotor core, the rotor winding of flowing through of cooling, cools off stator core, stator winding, rotor core, rotor winding, and the cooling of accomplishing the heat exchange is with gaseous from generator air outlet 8 discharge to generator 1's casing outside. As is conventional, a ventilation fan is fixedly installed on the rotor of the generator 1 near the generator inlet 7, so as to draw cooling air from the generator inlet 7 into the generator 1 to cool the internal components.
The generator 1 is provided with a cooling system comprising an air branch. As shown in fig. 1, the air branch comprises an air inlet duct, one end of the air inlet duct is open to the atmosphere, the other end of the air inlet duct is connected to the generator air inlet 7, and an air branch air inlet valve 13 is arranged on the air inlet duct; the air branch further comprises an air outlet pipeline, one end of the air outlet pipeline is open to the atmosphere, the other end of the air outlet pipeline is connected to the generator air outlet 8, and an air branch air outlet valve 14 is arranged on the air outlet pipeline. The air branch inlet valve 13 and the air branch outlet valve 14 are preferably electric gate valves or electric butterfly valves.
During normal operation of the generator 1, especially during medium and low load operation, the generator 1 is cooled only by the air branch, at this time, the air branch inlet valve 13 and the air branch outlet valve 14 are opened, and the ventilation fan draws air to cool the generator. When the generator 1 is in high-load operation or sudden-increase load operation, the cooling requirement cannot be met through the air branch, and the temperature of the stator winding, the stator core, the rotor winding and the rotor core is increased suddenly.
In order to deal with the above harsh conditions, the cooling system is further provided with an emergency branch, as shown in fig. 1, the emergency branch comprises a compressor 2, a cooler 3, a pressure tank 4, an electric control valve 5, an expansion valve 6, an emergency branch air inlet valve 11 and an emergency branch air outlet valve 12, the compressor 2, the cooler 3, the pressure tank 4, the electric control valve 5 and the expansion valve 6 are sequentially connected, an inlet of the compressor 2 is connected with the emergency branch air outlet valve 12, an outlet of the expansion valve 6 is connected with the emergency branch air inlet valve 11, the emergency branch air inlet valve 11 is connected to an air inlet 7 of the generator, and the emergency branch air outlet valve 12 is connected to an air outlet 8 of the generator.
The compressor 2 is a piston compressor, a screw compressor or a turbo compressor, and is determined according to the nature of the working medium and the design requirement of emergency cooling, which is not described herein.
The emergency branch adopts carbon dioxide and/or nitrogen as working gas, the carbon dioxide and/or nitrogen is compressed into high-pressure high-temperature gas by the compressor 2, then the high-pressure high-temperature gas is cooled by the cooler 3, the cooler 3 preferably adopts deep low-temperature seawater as cooling water, and in order to control the cooling effect, an adjusting valve is arranged on a cooling water inlet pipe or a cooling water outlet pipe of the cooler 3. The high-pressure carbon dioxide and/or nitrogen cooled by the cooler 3 is sent into the pressure tank 4, and the pressure tank 4 is used as a storage container of the high-pressure carbon dioxide and/or nitrogen, so that the sufficient supply of the carbon dioxide and/or nitrogen is ensured when the emergency branch is used, and meanwhile, the function of stabilizing the pressure is also achieved. The high pressure carbon dioxide and/or nitrogen is flow controlled through the electrically controlled valve 5 and then expanded through the expansion valve 6, where the pressure of the high pressure carbon dioxide and/or nitrogen is reduced to a pressure close to atmospheric pressure and the temperature is very low. The low-temperature carbon dioxide and/or nitrogen at normal pressure enters the generator 1 through the emergency branch air inlet valve 11, and the carbon dioxide and/or nitrogen at very low temperature can quickly and effectively cool the components in the generator 1, so that the severe cooling requirement is met. The carbon dioxide and/or nitrogen after heat exchange returns to the inlet of the compressor 2 through the air outlet 8 of the generator and the air outlet valve 12 of the emergency branch, and the carbon dioxide and/or nitrogen sequentially reciprocates.
It should be noted that, when the generator 1 works at a medium-low load, the air branch is used for cooling, at this time, the air branch inlet valve 13 and the air branch outlet valve 14 are opened, and the emergency branch inlet valve 11 and the emergency branch outlet valve 12 are closed; when the emergency branch is used for cooling, the emergency branch air inlet valve 11 and the emergency branch air outlet valve 12 are opened, and the air branch air inlet valve 13 and the air branch air outlet valve 14 are closed. Therefore, the working medium in the emergency branch can be isolated from the air, and can be circularly and repeatedly operated and recycled, so that the efficiency of the working medium in the emergency branch is improved.
Further, the generator also comprises a cooling control system, the cooling control system comprises a controller, a generator air inlet temperature sensor 9 and a generator air outlet temperature sensor 10, the controller receives the air inlet temperature and the air outlet temperature of the generator 1 in real time, and meanwhile the controller also receives real-time current data of the generator.
The controller calculates and monitors the air outlet temperature and the difference between the air outlet temperature and the air inlet temperature, and simultaneously monitors the cooling condition inside the generator 1 in real time by combining the real-time current data of the generator.
The controller comprises a processor and a memory, the processor draws a change curve of the outlet air temperature for the received outlet air temperature data, when the value of the outlet air temperature reaches a threshold value, the requirement cannot be met by cooling inside the generator, and the danger that parts are overheated exists, at the moment, the controller controls related valves to switch cooling from the air branch to the emergency branch. Or the controller monitors the rising trend of the outlet air temperature, namely, the derivative operation is carried out on the outlet air temperature change curve, when the obtained result exceeds a threshold value, the outlet air temperature rises too fast, and when the current value at the moment is combined, when the situation that the cooling inside the generator cannot meet the requirement and the danger of overheating of parts is reflected, the controller controls the relevant valves at the moment, and the cooling is switched from the air branch to the emergency branch.
Advantageously, the controller also receives real-time current data of the generator in real time, since the variations in current data often lead the tendency of components in the generator 1 to heat up and both have a correlation, the monitoring of current data often enables an earlier and better cooling of the generator 1. When the current value exceeds a first threshold value or the current rise rate exceeds a second threshold value and the current value exceeds a third threshold value, the controller controls a relevant valve to switch cooling from the air branch to the emergency branch when the situation that the cooling inside the generator cannot meet the requirement and the danger of overheating of components is reflected. The controller is connected with the electric control valve 5 and can control the opening of the electric control valve 5 in the emergency branch so as to control the flow of the working medium in the emergency branch. Of course, the controller can meet the cooling requirements of the generator 1 under various emergency conditions by adjusting the working condition of the compressor 2 and the opening of the electric control valve 5.
Further, the controller monitors transient currents of the current of the generator 1, including magnitude of the current value of the transient current, rising rate and duration of the transient current, which are generally caused by harmful transient events such as short circuit, overload, solar flare or burst electromagnetic radiation, etc., and generate heat in the generator which is sudden and difficult to suppress by conventional cooling, and when the value and duration of the monitored transient current exceed a certain threshold value, even though the outlet air temperature of the generator is not yet too high, the controller switches the cooling of the generator 1 to the emergency branch early, which can effectively suppress the rising of the temperature of components in the generator 1, prevent the temperature from being too high, so that the monitoring of the transient current can predictively and more effectively cope with the extreme severe events.
Another embodiment is shown in fig. 2, which is substantially the same as the cooling system of fig. 1, with only the differences being described herein. In fig. 2, the cooling system further comprises a heat exchanger 17. Wherein the emergency branch further comprises a heat exchanger cooling path for a heat exchanger 17, which cooling path is connected between the expansion valve 6 and the emergency branch inlet valve 11 at one end and between the emergency branch outlet valve 12 and the compressor 2 at the other end. A heat exchanger cooling passage inlet valve 15 and a heat exchanger cooling passage outlet valve 16 are provided in the heat exchanger cooling passage.
And the air branch is also connected to the heat exchanger 17, and the air in the air branch exchanges heat with the low-temperature carbon dioxide and/or nitrogen in the cooling channel of the heat exchanger 17 to cool the air entering the generator 1.
When the controller monitors that the air outlet temperature of the generator exceeds a first threshold value, or the air outlet temperature rises too fast to exceed a second threshold value and the air outlet temperature reaches a third threshold value, the controller controls the inlet valve 15 of the cooling passage of the heat exchanger and the outlet valve 16 of the cooling passage of the heat exchanger to be opened, and simultaneously controls the compressor 2 and the electric control valve 5 to operate, so that the air is cooled by low-temperature carbon dioxide/nitrogen, and the low-temperature air is used for cooling the generator 1.
And when the heat productivity in the generator 1 is too large, the outlet air temperature of the generator exceeds a fourth threshold value larger than the first threshold value, or the outlet air temperature rises too fast and exceeds a fifth threshold value larger than the second threshold value and reaches a sixth threshold value, the controller switches the cooling of the generator 1 from the air branch circuit to the emergency branch circuit, and a large amount of low-temperature carbon dioxide and/or nitrogen is used for cooling the generator 1.
Similarly, the controller also receives real-time current data of the generator in real time, and when the current value exceeds a first threshold value or the rising rate of the current exceeds a second threshold value and the current value exceeds a third threshold value, the controller controls a relevant valve to switch cooling from the air branch to the emergency branch when the situation that the cooling inside the generator cannot meet the requirement and the danger of overheating of components is reflected. More closely, the controller monitors the transient current of the generator 1, including the current value and the duration of the transient current, and when the value and the duration of the monitored transient current exceed a certain threshold, even if the outlet air temperature of the generator is not too high at the moment, the controller switches the cooling of the generator 1 to the emergency branch in advance, so that the temperature rise of components in the generator 1 can be effectively inhibited, the temperature is prevented from being too high, and the transient current monitoring can be used for predictively and more effectively dealing with the extreme severe events.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (9)

1. A cooling system of a marine generator comprises an air branch and an emergency branch, wherein the air of the air branch is independent of the working medium of the emergency branch;
the air branch comprises an air branch air inlet valve and an air branch air outlet valve, the air branch air inlet valve is connected to the air inlet of the generator, and the air branch air outlet valve is connected to the air outlet of the generator;
the emergency branch comprises a compressor, a cooler, a pressure tank, an electric control valve, an expansion valve, an emergency branch air inlet valve and an emergency branch air outlet valve, wherein the compressor, the cooler, the pressure tank, the electric control valve and the expansion valve are sequentially connected, the inlet of the compressor is connected with the emergency branch air outlet valve, the outlet of the expansion valve is connected with the emergency branch air inlet valve, the emergency branch air inlet valve is connected to the air inlet of the generator, and the emergency branch air outlet valve is connected to the air outlet of the generator;
the cooling system further comprises a generator air inlet temperature sensor, a generator air outlet temperature sensor and a controller, the generator air inlet temperature sensor is installed at an air inlet of the generator, the generator air outlet temperature sensor is installed at an air outlet of the generator, and the controller is connected with the compressor, the electric control valve, the emergency branch air inlet valve, the emergency branch air outlet valve, the generator air inlet temperature sensor and the generator air outlet temperature sensor;
the controller also receives current data of the generator, responds to the air outlet temperature of the generator, the air outlet temperature rising rate, the value of transient current of the generator, the transient current rising rate and the duration of the transient current, and switches the cooling of the generator from the air branch to the emergency branch when at least one parameter of the air outlet temperature of the generator, the air outlet temperature rising rate, the value of the transient current of the generator, the transient current rising rate and the duration of the transient current exceeds a threshold value;
wherein the cooling system further comprises a heat exchanger, a heat exchanger cooling passage inlet valve, a heat exchanger cooling passage outlet valve, the heat exchanger cooling passage inlet valve being connected between the expansion valve and the emergency branch inlet valve, the heat exchanger cooling passage outlet valve being connected between the emergency branch outlet valve and the compressor, the heat exchanger being connected to the atmosphere by a cooling passage inlet, the heat exchanger being connected to the air branch inlet valve by a cooling passage outlet, whereby the controller is able to select the cooling of the generator to be performed by an air branch not cooled by the heat exchanger, an air branch cooled by the heat exchanger, or an emergency branch.
2. The cooling system of claim 1, wherein the air branch inlet valve and the air branch outlet valve are connected to a controller.
3. Cooling system according to claim 1 or 2, characterised in that the working medium in the emergency branch is carbon dioxide and/or nitrogen.
4. Cooling system according to claim 1 or 2, characterised in that the compressor is a piston compressor, a screw compressor or a turbo compressor.
5. A cooling system according to claim 1 or 2, characterized in that the cooler cools the working medium with seawater.
6. The cooling system of claim 5, wherein the cooling seawater enters the cooler via a regulating valve.
7. A control system for a marine generator cooling system for controlling a cooling system as claimed in any one of the preceding claims, the control system comprising a controller in the cooling system, the controller being connected to the compressor, the electrical control valve, the emergency branch inlet valve, the emergency branch outlet valve, the generator inlet air temperature sensor, the generator outlet air temperature sensor, the heat exchanger cooling path inlet valve, the heat exchanger cooling path outlet valve, the air branch inlet valve, the air branch outlet valve, the controller also receiving the generator current.
8. The control system of claim 7, wherein the controller is responsive to a wind outlet temperature of the generator, a wind outlet temperature ramp rate, a value of transient current of the generator, a transient current ramp rate, and a duration of the transient current, and wherein the controller selects the cooling of the generator to be performed by the air branch not cooled by the heat exchanger, the air branch cooled by the heat exchanger, or the emergency branch based on at least one of the wind outlet temperature of the generator, the wind outlet temperature ramp rate, the value of transient current of the generator, the transient current ramp rate, and the duration of the transient current exceeding a threshold.
9. The control system of claim 7 or 8, wherein the controller regulates the compressor and the electronically controlled valve to a maximum state when the value of the transient current, the transient current ramp rate, and the duration of the transient current all exceed threshold values.
CN202010185053.0A 2020-03-17 2020-03-17 Marine generator cooling system and control system Active CN111322778B (en)

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Application Number Priority Date Filing Date Title
CN202010185053.0A CN111322778B (en) 2020-03-17 2020-03-17 Marine generator cooling system and control system

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US8928443B2 (en) * 2012-05-17 2015-01-06 Elwha Llc Electrical device with emergency cooling system
CN203127133U (en) * 2013-03-05 2013-08-14 中集海洋工程研究院有限公司 Marine water cooling system
CN104632348A (en) * 2013-11-06 2015-05-20 瑞昌哥尔德发电设备(无锡)制造有限公司 Marine generator set with double-cooling systems
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