CN111874202A - Energy-consuming ship self-flow cooling system - Google Patents
Energy-consuming ship self-flow cooling system Download PDFInfo
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- CN111874202A CN111874202A CN202010670416.XA CN202010670416A CN111874202A CN 111874202 A CN111874202 A CN 111874202A CN 202010670416 A CN202010670416 A CN 202010670416A CN 111874202 A CN111874202 A CN 111874202A
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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
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Abstract
The invention discloses an energy-consumption ship self-flow cooling system, which comprises a seawater cooling subsystem and a power supply and power generation energy consumption subsystem; the power supply and generation energy consumption subsystem comprises: a power supply switch, a frequency converter, a motor generator and a controller; the ship power grid is electrically connected with the cooling water pump through the power supply switch, the frequency converter and the motor generator in sequence; the control end of the controller is respectively electrically connected with the frequency converter and the motor generator so as to control the motor generator to operate in an electric state or a power generation state and adjust the energy consumption of the energy consumption circuit when the motor generator operates in the power generation state. According to the energy-consumption ship self-flow cooling system provided by the invention, the rotating speed and the flow of the water pump are directly regulated through the frequency converter in the pump flow state, the motor generator generates power to generate resistance by using the principle of the water turbine in the self-flow state, the rotating speed of the cooling water pump is regulated by controlling the energy consumption circuit, the self-flow is regulated to the required cooling water quantity, and the automatic regulation of the flow of the cooling system is effectively realized.
Description
Technical Field
The invention relates to the field of design of ship cooling systems, in particular to an energy-consuming ship self-flow cooling system.
Background
The sea-going system is one of the important systems of ships, and is used for transferring heat generated by operation of ship power systems such as steam power systems and diesel engines and equipment in ships to cooling water and discharging the heat out of the ships. With the gradual development of modern ships in the directions of low energy consumption, economy, comfort and the like, researchers have proposed ship self-flow cooling technology for reducing pump power loss, improving energy efficiency and reducing vibration noise, namely, a self-flow generator is arranged at an entrance of an outboard sea-going system, and the flow resistance in the system is overcome by using the oncoming flow dynamic pressure of ship navigation, so that the pump-free driving of cooling water in a certain ship speed range is realized.
When the system is in a self-flowing state, the cooling water pump cuts off the driving energy and rotates along with the cooling water impact. When pump flow is adopted for water supply, the input of driving energy needs to be adjusted to change the rotating speed of the cooling water pump, so that the cooling water flow is matched with the heat exchange requirement. In the interval of the self-flow navigational speed, the self-flow is generally higher than the cooling water amount required by heat exchange, so that the working medium in the ship is easily supercooled. According to the fluid mechanics principle, the flowing resistance of the sea-going system needs to be increased to ensure that the self-flowing flow is equal to the required cooling water amount, and the resistance can be adjusted along with the ship navigation working condition. In the prior art, the self-flowing flow control scheme is that a resistance adjusting device or a self-flowing port adjusting device is added in a sea pipeline. The passive regulating device can only be regulated according to the ship speed and cannot be regulated according to the cooling water temperature, and the active regulating device needs to be additionally provided with other mechanical control structures, so that the overall structure is complex and the reliability is poor.
Disclosure of Invention
In view of the technical defects and application requirements, on the basis of not adding other resistance adjusting devices, the embodiment of the invention provides an energy-consuming ship self-flowing cooling system, which can effectively realize automatic adjustment of the flow of the cooling system when a seawater cooling subsystem is in a pump flow state and a self-flowing state.
In order to solve the above problems, the present invention provides an energy-consuming self-flowing cooling system for a ship, comprising:
a seawater cooling subsystem and a power supply and power generation energy consumption subsystem; the seawater cooling subsystem comprises a cooling water pump;
the power supply and generation energy consumption subsystem comprises: a power supply switch, a frequency converter, a motor generator and a controller; the frequency converter comprises an energy consumption circuit; the motor generator is provided with an electric state and a power generation state;
the ship power grid is electrically connected with the cooling water pump sequentially through the power supply switch, the frequency converter and the motor generator; the control end of the controller is electrically connected with the frequency converter and the motor generator respectively so as to control the motor generator to operate in an electric state or a power generation state and adjust the energy consumption of the energy consumption circuit when the motor generator operates in the power generation state.
Further, the frequency converter further includes: a rectifier, an inverter and a filter capacitor;
the ship power grid is electrically connected with the motor generator sequentially according to the power supply switch, the rectifier and the inverter, and the filter capacitor and the energy consumption circuit are connected in parallel on the rectifier and the inverter.
Further, the frequency converter further includes: the first direct current bus and the second direct current bus;
the first end of the rectifier is electrically connected with the first end of the inverter through the first direct current bus, and the second end of the rectifier is electrically connected with the second end of the inverter through the second direct current bus; the filter capacitor and the energy consumption circuit are both electrically connected to the first direct current bus and the second direct current bus.
Further, the power consuming circuit comprises: a chopper and an energy consumption resistor; the chopper is electrically connected with the energy consumption resistor, and a formed circuit is connected in parallel with the first direct current bus and the second direct current bus.
Further, the energy-consuming ship self-flowing cooling system further comprises: a fresh water cooling subsystem; and the heat dissipation end of the frequency converter is connected with the fresh water cooling subsystem.
Further, the seawater cooling subsystem comprises: the cooling water inlet, the cooling water pump, the cooler and the cooling water outlet are communicated in sequence; and the ship power grid is electrically connected with the cooling water pump sequentially through the frequency converter and the motor generator.
Further, the seawater cooling subsystem further comprises: an inlet port side valve and an outlet port side valve; the inlet side valve is installed between the cooling water inlet and the cooling water pump; the outlet side valve is installed between the cooler and the cooling water outlet.
Further, the cooling water pump is an axial flow type cooling water pump or a centrifugal type cooling water pump.
Furthermore, the cooler is a shell-and-tube heat exchanger, cooling water is arranged on the tube side, and working medium to be cooled is arranged on the shell side.
Further, the motor generator is an alternating current motor, so that the motor generator is controlled to operate in an electric state or a power generation state through a power conversion switch inside the motor generator.
The ship self-flowing cooling system comprises a seawater cooling subsystem and a power supply and power generation energy consumption subsystem, wherein a ship power grid is electrically connected with a cooling water pump through a power supply switch, a frequency converter and a motor generator in sequence, and a control end of a controller is electrically connected with the frequency converter and the motor generator respectively so as to control the motor generator to operate in an electric state or a power generation state and adjust the energy consumption of an energy consumption circuit when the motor generator operates in the power generation state. When the seawater cooling subsystem is in a pump flow state, the rotating speed and the flow of the water pump can be directly adjusted through the frequency converter. When the seawater cooling subsystem is in a self-flowing state, the motor generator can generate power to generate resistance by utilizing the principle of the water turbine, and the rotation speed of the cooling water pump is adjusted by controlling the energy consumption circuit, so that the self-flowing flow is adjusted to the required cooling water amount, and the automatic adjustment of the flow of the cooling system is effectively realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in 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 some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an energy-consuming self-flowing ship cooling system provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of a frequency converter according to an embodiment of the present invention;
description of reference numerals: 1. a cooling water inlet; 2. an inlet port side valve; 3. a cooling water pump; 4. a motor generator; 5. a frequency converter; 6. a controller; 7. a power supply switch; 8. a cooler; 9. an outlet port side valve; 10. a cooling water outlet; 51. a rectifier; 52. a first direct current bus; 53. an inverter; 54. a filter capacitor; 55. a chopper; 56. a power consumption resistor; 57. and a second direct current bus.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
According to the working principle of the pumped storage power station, when the water pump turbine unit works in a water pump mode, blades rotate reversely, power is consumed for pumped storage, when the water pump turbine unit works in a water turbine mode, the blades rotate forwards to generate power, the former is consistent with the flow state of a cooling water pump, the latter is similar to the self-flow state, and the difference is that the incoming flow direction of a sea system is always the same, and the sea system is in an idle state during self-flow. If the cooling water pump works in the form of a water turbine and the resistance of the sea dredging system is adjusted by the cooling water pump, no additional resistance adjusting device is needed.
Therefore, an embodiment of the present invention provides an energy-consuming ship self-flowing cooling system, as shown in fig. 1, the energy-consuming ship self-flowing cooling system includes: a seawater cooling subsystem and a power supply and power generation energy consumption subsystem. The seawater cooling subsystem includes a cooling water pump 3. The power supply and generation energy consumption subsystem comprises: a power supply switch 7, a frequency converter 5, a motor generator 4 and a controller 6. The frequency converter 5 comprises an energy consuming circuit. The motor generator 4 is provided with an electromotive state and a power generation state. The ship power grid is electrically connected with the cooling water pump 3 in the seawater cooling subsystem sequentially through the power supply switch 7, the frequency converter 5 and the motor generator 4, and the control end of the controller 6 is electrically connected with the frequency converter 5 and the motor generator 4 respectively so as to control the motor generator 4 to operate in an electric state or a power generation state and adjust the energy consumption of the energy consumption circuit when the motor generator 4 operates in the power generation state.
The controller 6 receives the ship sensor input signal and controls the motor generator 4 and the inverter 5.
The specific operation mode of the energy-consuming type ship self-flowing cooling system provided by the embodiment is as follows:
in the sailing process of the ship, cooling water flows through a seawater cooling subsystem to take away heat in the ship, and two water supply methods of pump flow and self-flow are adopted. In the self-flowing navigational speed interval, the self-flowing flow can completely meet the requirement of cooling water quantity, and the excessive water quantity causes the supercooling of the working medium in the ship. The required cooling water amount is mainly determined by the sailing working condition, namely the sailing speed and the cooling water temperature, and the self-flowing water amount is determined by the sailing speed. The energy-consuming ship self-flow cooling system provided by the embodiment of the invention enables the actual cooling water flow passing through the seawater cooling subsystem to be matched with the cooling water quantity.
When the ship sails in the pump flow interval, the power supply switch 7 is closed, the controller 6 controls the motor of the motor generator 4 to be in an electric state, namely the rotating speed of the cooling water pump 3 in the seawater cooling subsystem is positive, the torque of the motor generator 4 is positive, electric energy is absorbed from a ship power grid to drive the cooling water pump 3 to rotate, and the required cooling water flow is obtained.
When the ship sails in the gravity flow area, the power supply switch 7 is switched off, the controller 6 controls the motor of the motor generator 4 to be in a power generation state, namely the rotating speed of the cooling water pump 3 is positive, the torque of the motor generator 4 is negative, and the gravity flow cooling water drives the cooling water pump 3 to be in a water turbine state to drive the motor generator 4 to rotate for power generation. The electric energy consumed by the energy consumption circuit is controlled, and the braking torque of the motor generator 4 is adjusted, so that the rotation speed of the cooling water pump 3 is adjusted, and the required cooling water flow is obtained.
The ship control center calculates whether the current cooling water flow meets the cooling requirement or not by monitoring signals such as the temperature and the flow of a ship heat exchange working medium, and transmits a control signal to the controller 6.
When the ship speed is in the pump flow interval, if the cooling water flow is equal to the flow required by heat exchange, the rotating speed of the motor generator 4 is unchanged; if the cooling water flow is higher than the flow required by heat exchange, the controller 6 controls the rotating speed of the motor generator 4 to be reduced, so that the rotating speed of the cooling water pump 3 is reduced, and the cooling water flow is reduced; if the cooling water flow is lower than the flow required by heat exchange, the controller 6 controls the rotation speed of the motor generator 4 to rise, so that the rotation speed of the cooling water pump 3 rises, and the cooling water flow rises.
When the ship speed is in the gravity flow interval, if the cooling water flow is equal to the flow required by cooling, the rotating speed of the motor generator 4 is unchanged; if the cooling water flow is higher than the flow required by heat exchange, the controller 6 controls the energy consumption circuit, so that the energy consumption of the energy consumption circuit is increased, the braking torque of the motor generator 4 is increased, the rotating speed of the cooling water pump is reduced, and the cooling water flow is reduced. If the cooling water flow is lower than the flow required by heat exchange, the controller 6 consumes energy of the circuit, so that the energy consumption of the circuit is reduced, the braking torque of the motor generator 4 is reduced, the rotating speed of the cooling water pump is increased, and the cooling water flow is increased.
According to the energy-consumption ship self-flowing cooling system provided by the embodiment of the invention, the seawater cooling subsystem and the power supply and power generation energy consumption subsystem are arranged, a ship power grid is electrically connected with the cooling water pump sequentially through the power supply switch, the frequency converter and the motor generator, the control end of the controller is electrically connected with the frequency converter and the motor generator respectively so as to control the motor generator to operate in an electric state or a power generation state, and the energy consumption of an energy consumption circuit is adjusted when the motor generator operates in the power generation state. When the seawater cooling subsystem is in a pump flow state, the rotating speed and the flow of the water pump can be directly adjusted through the frequency converter. When the seawater cooling subsystem is in a self-flowing state, the motor generator can generate power to generate resistance by utilizing the principle of the water turbine, and the rotation speed of the cooling water pump is adjusted by controlling the energy consumption circuit, so that the self-flowing flow is adjusted to the required cooling water amount, and the automatic adjustment of the flow of the cooling system is effectively realized.
Based on the above embodiments, in another embodiment provided by the present invention, as shown in fig. 1 and fig. 2, the frequency converter 5 preferably adopts a voltage source type frequency converter, and its harmonic is smaller than that of a current source type frequency converter, and includes: rectifier 51, inverter 53, filter capacitor 54 and consumer circuit. The ship power grid is electrically connected with the motor generator 4 through the power supply switch 7, the rectifier 51 and the inverter 53 in sequence, and the filter capacitor 54 and the energy consumption circuit are connected between the rectifier 51 and the inverter 53 in parallel. The rectifier 51 is used to rectify the ship grid ac into dc. The inverter 53 is used to invert the direct current into alternating current of which both the voltage and the frequency are adjustable. The filter capacitor 54 is used for filtering to obtain a direct current with a flat waveform.
Wherein, converter 5 still includes: a first dc bus 52 and a second dc bus 57. A first end of the rectifier 51 is electrically connected to a first end of the inverter 53 through a first dc bus 52, and a second end of the rectifier 51 is electrically connected to a second end of the inverter 53 through a second dc bus 57. The filter capacitor 54 and the energy dissipation circuit are electrically connected to the first dc bus 52 and the second dc bus 57.
The motor generator 4 may be an alternating current motor to control the motor generator 4 to operate in a motoring state or a generating state through a power conversion switch inside the motor generator 4.
Wherein, power consumption circuit includes: chopper 55 and dissipation resistor 56. The chopper 55 may be an IGBT (insulated gate Bipolar Transistor) chopper. The chopper 55 is electrically connected with the energy consumption resistor 56, and the formed circuit is connected in parallel with the first direct current bus 52 and the second direct current bus 57.
The controller 6 receives a control signal sent by a ship control center, controls the motor generator 4 and the frequency converter 5, controls a power conversion switch inside a motor of the motor generator 4, controls the output frequency and voltage of the inverter 53, and controls the conduction ratio of the chopper 55 in the energy consumption circuit.
In the working process, the frequency converter 5 is connected with a ship power grid through the power supply switch 7, firstly, ship high-voltage alternating current is rectified into direct current through the rectifier 51, the direct current is filtered by the filter capacitor 54 to obtain direct current with a flat waveform, then, the direct current is connected to the inverter 53 through the first direct current bus 52 and the second direct current bus 57 and is inverted into alternating current with adjustable frequency and voltage, and the frequency and voltage regulation of the power supply of the motor generator 4 is realized. And when the chopper 55 is switched on, the energy consumption resistor 56 absorbs the electric energy of the first direct current bus 52 and the second direct current bus 57.
In this embodiment, the seawater cooling subsystem includes: a cooling water inlet 1, a cooling water pump 3, a cooler 8 and a cooling water outlet 10 which are communicated in sequence. The ship power grid is electrically connected with the cooling water pump 3 through the frequency converter 5 and the motor generator 4 in sequence. Seawater enters the seawater cooling subsystem through a cooling water inlet 1, passes through a cooling water pump 3 and a cooler 8 in sequence, and is discharged from a cooling water outlet 10.
The cooling water pump 3 can work in the full operating mode range of the ship, under the pump flow operating mode, the motor generator 4 works in an electric state, the alternating current frequency is changed through the frequency converter 5, and stepless speed regulation is carried out on the motor generator 4 and the cooling water pump 3. Under the gravity flow working condition, the motor generator 4 works in a power generation state, and the power of the energy consumption resistor 56 is controlled by changing the conduction ratio of the chopper 55, so that the rotating speed of the motor generator 4 is controlled, and the gravity flow is regulated.
The cooling water pump 3 is an axial flow type cooling water pump or a centrifugal type cooling water pump, and the axial flow type cooling water pump is preferentially adopted, so that the system is suitable for the use environment of a seawater cooling subsystem with high flow rate and low lift. The cooler 8 is a shell-and-tube heat exchanger, the tube side is cooling water, and the shell side is a working medium to be cooled, such as steam, lubricating oil, fresh water and the like.
To avoid undesirable consequences of leakage in the seawater cooling subsystem, inlet and outlet side valves 2, 9 are provided in the subsystem. The inlet side valve 2 is installed between the cooling water inlet 1 and the cooling water pump 3. An outlet side valve 9 is installed between the cooler 8 and the cooling water outlet 10.
In addition, the self-flowing cooling system of the energy-consuming type ship further comprises: a fresh water cooling subsystem. And the heat dissipation end of the frequency converter 5 is connected with the fresh water cooling subsystem. The frequency converter 5 can be cooled by a fresh water cooling subsystem inside the vessel. More efficient than the conventional air cooling
The specific operation mode of the energy-consuming type ship self-flowing cooling system provided by the embodiment is as follows:
in the sailing process of the ship, cooling water flows through a seawater cooling subsystem to take away heat in the ship, and two water supply methods of pump flow and self-flow are adopted. In the self-flowing navigational speed interval, the self-flowing flow can completely meet the requirement of cooling water quantity, and the excessive water quantity causes the supercooling of the working medium in the ship. The required cooling water amount is mainly determined by the sailing working condition, namely the sailing speed and the cooling water temperature, and the self-flowing water amount is determined by the sailing speed. The energy-consuming ship self-flow cooling system provided by the embodiment of the invention enables the actual cooling water flow passing through the seawater cooling subsystem to be matched with the water flow required by cooling.
When the ship sails in the pump flow interval, the power supply switch 7 is closed, the controller 6 controls the motor of the motor generator 4 to be in an electric state, namely the rotating speed of the water pump is positive, the torque of the motor generator 4 is positive, electric energy is absorbed from a ship power grid to drive the cooling water pump 3 to rotate, and the required cooling water flow is obtained.
When the ship sails in the gravity flow region, the power supply switch 7 is switched off, the controller 6 controls the motor of the motor generator 4 to be in a power generation state, namely, the rotating speed of the cooling water pump 3 is positive, the torque of the motor generator 4 is negative, the gravity flow cooling water drives the cooling water pump 3 to be in a water turbine state, the motor generator 4 is driven to rotate to generate power, the chopper 55 is switched on, the energy consumption resistor 56 consumes electric energy, the braking torque of the motor generator 4 is adjusted, and therefore the rotating speed of the cooling water pump 3 is adjusted to obtain the required cooling water flow. Wherein the heat generated by the energy consumption resistor 56 is carried away by the fresh water cooling system inside the ship.
The ship control center calculates whether the current cooling water flow meets the cooling requirement or not by monitoring signals such as the temperature and the flow of a ship heat exchange working medium, and transmits a control signal to the controller 6.
When the ship speed is in the pump flow interval, if the cooling water flow is equal to the flow required by heat exchange, the rotating speed of the motor generator 4 is unchanged; if the cooling water flow is higher than the flow required by heat exchange, the controller 6 controls the output frequency and power of the inverter 53 to be reduced, so that the rotating speed of the motor generator 4 is reduced, the rotating speed of the cooling water pump 3 is reduced, and the cooling water flow is reduced; if the flow rate of the cooling water is lower than the flow rate required for heat exchange, the controller 6 controls the inverter 53 to increase the output frequency and power, so that the rotational speed of the motor generator 4 is increased, the rotational speed of the cooling water pump 3 is increased, and the flow rate of the cooling water is increased.
When the ship speed is in the gravity flow interval, if the cooling water flow is equal to the flow required by cooling, the rotating speed of the motor generator 4 is unchanged; if the cooling water flow is higher than the flow required by heat exchange, the controller 6 controls the conduction ratio of the chopper 55 to increase, the energy consumption of the energy consumption resistor 56 is increased, the braking torque on the motor generator 4 is increased, and therefore the rotating speed of the cooling water pump 3 is reduced, and the cooling water flow is reduced; if the flow of the cooling water is lower than the flow required by heat exchange, the controller 6 controls the conduction ratio of the chopper 55 to be reduced, the energy consumption of the energy consumption resistor 56 is reduced, and the braking torque on the motor generator 4 is reduced, so that the rotating speed of the cooling water pump 3 is increased, and the flow of the cooling water is increased.
In summary, in the energy-consuming ship self-flowing cooling system provided in the embodiment of the present invention, by providing the seawater cooling subsystem and the power supply and power generation energy-consuming subsystem, the ship power grid is electrically connected to the cooling water pump through the power supply switch, the frequency converter and the motor generator in sequence, and the control end of the controller is electrically connected to the frequency converter and the motor generator respectively, so as to control the motor generator to operate in the electric state or the power generation state, and adjust the energy consumption of the energy-consuming circuit when the motor generator operates in the power generation state. When the seawater cooling subsystem is in a pump flow state, the rotating speed and the flow of the water pump can be directly adjusted through the frequency converter. When the seawater cooling subsystem is in a self-flowing state, the motor generator can generate power to generate resistance by utilizing the principle of the water turbine, and the rotation speed of the cooling water pump is adjusted by controlling the energy consumption circuit, so that the self-flowing flow is adjusted to the required cooling water amount, and the automatic adjustment of the flow of the cooling system is effectively realized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the invention, but not to limit it; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An energy-consuming marine free-flow cooling system, comprising:
a seawater cooling subsystem and a power supply and power generation energy consumption subsystem; the seawater cooling subsystem comprises a cooling water pump;
the power supply and generation energy consumption subsystem comprises: a power supply switch, a frequency converter, a motor generator and a controller; the frequency converter comprises an energy consumption circuit; the motor generator is provided with an electric state and a power generation state;
the ship power grid is electrically connected with the cooling water pump sequentially through the power supply switch, the frequency converter and the motor generator; the control end of the controller is electrically connected with the frequency converter and the motor generator respectively so as to control the motor generator to operate in an electric state or a power generation state and adjust the energy consumption of the energy consumption circuit when the motor generator operates in the power generation state.
2. The dissipative marine self-current cooling system according to claim 1, wherein the frequency converter further comprises: a rectifier, an inverter and a filter capacitor;
the ship power grid is electrically connected with the motor generator sequentially according to the power supply switch, the rectifier and the inverter, and the filter capacitor and the energy consumption circuit are connected in parallel on the rectifier and the inverter.
3. The dissipative marine self-current cooling system according to claim 2, wherein the frequency converter further comprises: the first direct current bus and the second direct current bus;
the first end of the rectifier is electrically connected with the first end of the inverter through the first direct current bus, and the second end of the rectifier is electrically connected with the second end of the inverter through the second direct current bus; the filter capacitor and the energy consumption circuit are both electrically connected to the first direct current bus and the second direct current bus.
4. The dissipative marine self-current cooling system according to claim 3, wherein the dissipative electrical circuit comprises: a chopper and an energy consumption resistor; the chopper is electrically connected with the energy consumption resistor, and a formed circuit is connected in parallel with the first direct current bus and the second direct current bus.
5. The dissipative marine free-flow cooling system according to claim 1, further comprising: a fresh water cooling subsystem; and the heat dissipation end of the frequency converter is connected with the fresh water cooling subsystem.
6. The dissipative marine free-flow cooling system according to claim 1, wherein the seawater cooling subsystem comprises: the cooling water inlet, the cooling water pump, the cooler and the cooling water outlet are communicated in sequence; and the ship power grid is electrically connected with the cooling water pump sequentially through the frequency converter and the motor generator.
7. The dissipative marine free-flow cooling system according to claim 6, wherein the seawater cooling subsystem further comprises: an inlet port side valve and an outlet port side valve;
the inlet side valve is installed between the cooling water inlet and the cooling water pump; the outlet side valve is installed between the cooler and the cooling water outlet.
8. The energy-consuming marine free-flow cooling system of claim 6, wherein the cooling water pump is an axial flow cooling water pump or a centrifugal cooling water pump.
9. The energy-consuming marine free-flow cooling system of claim 6, wherein the cooler is a shell and tube heat exchanger, the tube side is cooling water, and the shell side is the working medium to be cooled.
10. The energy-consuming marine self-current cooling system according to any one of claims 1-9, wherein the motor generator is an alternating current motor, so that the motor generator is controlled to operate in a power-driven state or a power-generating state by a power conversion switch inside the motor generator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443113A (en) * | 2021-07-31 | 2021-09-28 | 绍兴市松陵造船有限责任公司 | Ship cooling system with auxiliary propulsion function |
| CN114348224A (en) * | 2022-02-18 | 2022-04-15 | 中国船舶重工集团公司第七一九研究所 | Ship variable frequency pump cooling system and control method thereof |
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| CN114348224A (en) * | 2022-02-18 | 2022-04-15 | 中国船舶重工集团公司第七一九研究所 | Ship variable frequency pump cooling system and control method thereof |
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Application publication date: 20201103 |