A phase modulation camera cooling system based on non-azeotropic working fluid and magnetic refrigeration

Abstract

The application discloses a phase modulation camera cooling system based on non-azeotropic working medium and magnetic refrigeration, which comprises a magnetic refrigeration circulating mechanism connected with a phase modulation camera stator, and is filled with non-azeotropic mixed working medium in the inside. The magnetic refrigeration circulating mechanism comprises a magnetic refrigeration module, an external magnetic field adjusting system, a first condenser, an axial flow fan, a first gas-liquid separator and a refrigerant pump. The magnetic refrigeration module is internally provided with a magnetic working medium bed and a cooling flow channel, and phase change of the working medium is realized through heat exchange; the application utilizes temperature slip characteristics formed by the difference of boiling points of the non-azeotropic working medium, matches different temperature zones of lubricating oil and the stator coil, and improves cooling adaptability and energy efficiency; the magnetic refrigeration module is integrated in the inside of the stator, the heat dissipation is strengthened by combining with an alternating magnetic field adjustment, the structure is simplified, and the efficiency is improved; the lubricating oil tank cooling mechanism cooperates with the auxiliary condensing mechanism, the cooling efficiency, the working medium recovery rate and the operation reliability are improved, and the energy consumption and the cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of cooling technology for large-scale power equipment, specifically a phase condenser cooling system based on a non-azeotropic working fluid and magnetic refrigeration. Background Technology

[0002] Synchronous condensers are crucial reactive power compensation devices in power grids, and their stable operation is paramount. During operation, their stator windings and cores generate a significant amount of heat. If this heat cannot be dissipated in a timely manner, it will affect the stable operation of the synchronous condenser, thereby impacting the stability of the power grid. Traditional cooling methods, such as water cooling or air cooling, suffer from efficiency bottlenecks. Magnetic refrigeration, a solid-state cooling technology based on the magnetocaloric effect, possesses immense potential for high efficiency, low noise, vibration-free operation, and environmental friendliness. However, how to efficiently integrate it into the direct cooling of large power equipment like synchronous condensers and solve its system compatibility issues remains a pressing challenge. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a phase condenser cooling system based on a non-azeotropic working fluid and magnetic refrigeration, aiming to solve the problems in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a cooling system for a phase converter based on a non-azeotropic working fluid and magnetic refrigeration, comprising: a magnetic refrigeration circulation mechanism, which is connected to the stator of the phase converter for dissipating heat from the stator of the phase converter; the magnetic refrigeration circulation loop is filled with a non-azeotropic mixed working fluid.

[0005] The magnetic refrigeration cycle mechanism includes:

[0006] A magnetic cooling module is installed in the stator section of a synchronous condenser, exchanging heat with the stator windings and stator core. The magnetic cooling module contains a magnetic working fluid bed made of magnetocaloric material and cooling channels for the flow of a non-azeotropic working fluid mixture. The magnetic working fluid bed is in close contact with the stator windings and stator core via highly thermally conductive adhesive or metal thermally conductive pads. The cooling channels are arranged either embedded within the magnetic working fluid bed or surrounding it, exchanging heat with the magnetic working fluid bed through the channel walls. This allows the flowing non-azeotropic working fluid mixture to absorb heat from the stator region, undergo a phase change, and generate a non-azeotropic working fluid mixture in both gaseous and liquid states.

[0007] An external magnetic field conditioning system is provided on one side or around the magnetic refrigeration module to assist in the conditioning of the alternating magnetic field of the magnetic working fluid bed.

[0008] The first condenser and the axial fan that provides cooling airflow to the first condenser are connected at the inlet of the first condenser to the outlet of the working fluid of the magnetic refrigeration module, i.e., the outlet of the cooling channel, to receive and condense the gaseous non-azeotropic working fluid.

[0009] A first gas-liquid separator, wherein the inlet of the first gas-liquid separator is connected to the outlet of the first condenser;

[0010] A refrigerant pump, the inlet of which is connected to the outlet of the first gas-liquid separator; the outlet of the refrigerant pump is connected to the inlet of the cooling channel.

[0011] Furthermore, it also includes a lubricating oil tank cooling mechanism; a lubricating oil tank, the lubricating oil tank having an integrated evaporator coil, the inlet of the evaporator coil being connected to the outlet of the cooling channel; the evaporator coil being immersed in the lubricating oil in the lubricating oil tank; the outlet of the evaporator coil being connected to the inlet of the first condenser; a lubricating oil pump being installed in the lubricating oil tank, the lubricating oil pump being connected to a synchronous condenser through an oil inlet pipe, and the synchronous condenser being connected back to the lubricating oil tank through a return oil pipe.

[0012] Furthermore, it also includes an auxiliary condensation mechanism; the auxiliary condensation mechanism includes:

[0013] The second condenser has its inlet connected to the outlet of the first gas-liquid separator and is used to receive the gaseous non-azeotropic working fluid that is separated from the first gas-liquid separator.

[0014] The second gas-liquid separator has an inlet connected to the outlet of the second condenser. The second gas-liquid separator is provided with a gas phase outlet and a liquid phase outlet. The gas phase outlet of the second gas-liquid separator is connected to the inlet of the second condenser, and the liquid phase outlet of the second gas-liquid separator is connected to the inlet of the refrigerant pump.

[0015] The cooling tower and the circulating water pump that drives the cooling tower are connected in a heat exchange manner with the second condenser to remove the heat released by the second condenser.

[0016] Furthermore, the magnetic cooling module is directly embedded in the bar slot of the stator core of the synchronous condenser, or closely attached to the end of the stator winding.

[0017] Furthermore, the outlet of the cooling channel includes a gas phase outlet and a liquid phase outlet. The gas phase outlet of the cooling channel is connected to the inlet of the first condenser and is used to transfer the gaseous non-azeotropic working fluid output from the cooling channel to the first condenser for condensation. The liquid phase outlet of the cooling channel is connected to the inlet of the evaporator coil and is used to transfer the liquid non-azeotropic working fluid output from the cooling channel to the evaporator coil for heat exchange with the lubricating oil.

[0018] Furthermore, the outlet of the first gas-liquid separator includes a gas phase outlet and a liquid phase outlet. The gas phase outlet of the first gas-liquid separator is connected to the inlet of the second condenser and is used to transfer the gaseous non-azeotropic working fluid separated from itself to the second condenser for condensation. The liquid phase outlet of the first gas-liquid separator is connected to the inlet of the refrigerant pump and is used to transfer the liquid non-azeotropic working fluid separated from itself to the refrigerant pump.

[0019] Compared with existing technologies, the present invention has the following advantages:

[0020] (1) Based on the characteristics that the lubricating oil temperature exceeds 60°C and the stator coil temperature exceeds 40°C during the operation of the synchronous condenser, the present invention innovatively adopts a non-azeotropic working medium as the circulating medium and utilizes the temperature slip characteristics formed by the difference in boiling points of its constituent substances to achieve stepped condensation and temperature matching of the high temperature zone of the lubricating oil and the low temperature zone of the stator coil. This method not only significantly improves the adaptability and flexibility of cooling heat sources in different temperature zones, but also effectively enhances the overall energy efficiency of the system.

[0021] (2) The magnetic cooling module designed in this invention is directly integrated into the stator of the synchronous condenser, with a compact and reasonable structure. A controllable alternating magnetic field is applied to the magnetic working fluid in the module through an external magnetic field adjustment system, which actively stimulates the magnetocaloric effect and enhances the heat dissipation process of the stator winding and stator core. This integrated design significantly reduces the complexity of the external cooling pipeline. While simplifying the system structure, it greatly improves the heat dissipation efficiency and operational stability with the help of the adjustable magnetic cooling cycle.

[0022] (3) This invention achieves efficient cooling and recovery of lubricating oil and circulating working fluid through the coordinated operation of the lubricating oil tank cooling mechanism and the auxiliary condensation mechanism: the evaporation coil in the lubricating oil tank absorbs heat from the lubricating oil using the liquid non-azeotropic working fluid, causing it to vaporize; the gaseous working fluid then enters the first condenser for preliminary condensation, and the incompletely condensed components are further cooled and separated by the second condenser and the cooling tower. This coordinated mechanism not only significantly improves the lubricating oil cooling efficiency and working fluid recovery rate, but also reduces the system's dependence on a single condensation component, enhances operational reliability, and effectively reduces additional energy consumption and replenishment costs through energy cascade utilization and working fluid recycling, thereby improving overall economic efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the magnetic refrigeration module structure of the present invention.

[0025] In the diagram, 1. Magnetic working fluid bed; 2. Stator winding; 3. Stator core; 4. Cooling channel; 5. External magnetic field adjustment system; 6. First gas-liquid separator; 7. Refrigerant pump; 8. First condenser; 9. Axial fan; 10. Cooling tower; 11. Circulating water pump; 12. Lubricating oil tank; 13. Lubricating oil pump; 14. Second condenser; 15. Second gas-liquid separator. Detailed Implementation

[0026] like Figure 1 , Figure 2 As shown, the present invention provides a technical solution: a phase converter cooling system based on a non-azeotropic working fluid and magnetic refrigeration, comprising: a magnetic refrigeration circulation mechanism, which is connected to the stator part of the phase converter for heat dissipation of the stator part of the phase converter; the magnetic refrigeration circulation loop is filled with a non-azeotropic mixed working fluid.

[0027] The magnetic refrigeration cycle mechanism includes:

[0028] A magnetic cooling module is installed in the stator section of the synchronous condenser, where it exchanges heat with the stator winding 2 and stator core 3. The magnetic cooling module contains a magnetic working fluid bed 1 made of magnetocaloric material and a cooling channel 4 for the flow of a non-azeotropic working fluid. The magnetic working fluid bed 1 is in close contact with the stator winding 2 and stator core 3 through high thermal conductivity adhesive or metal thermally conductive pads to ensure efficient heat transfer to the module. The cooling channel 4 is arranged either embedded in the magnetic working fluid bed 1 or around its periphery, and exchanges heat with the magnetic working fluid bed 1 through the channel wall, causing the flowing non-azeotropic working fluid to absorb heat from the stator region, undergo a phase change, and generate a non-azeotropic working fluid in both gaseous and liquid states.

[0029] An external magnetic field adjustment system 5 is provided on one side or around the magnetic refrigeration module to assist in the adjustment of the alternating magnetic field of the magnetic working fluid bed 1.

[0030] The first condenser 8 and the axial fan 9 that provides cooling airflow to the first condenser 8 are connected at the inlet of the first condenser 8 to the outlet of the working fluid of the magnetic refrigeration module, i.e., the outlet of the cooling channel 4, to receive and condense the gaseous non-azeotropic working fluid.

[0031] The first gas-liquid separator 6 has its inlet connected to the outlet of the first condenser 8.

[0032] The refrigerant pump 7 has its inlet connected to the outlet of the first gas-liquid separator 6; the outlet of the refrigerant pump 7 is connected to the inlet of the cooling channel 4.

[0033] This also includes a lubricating oil tank cooling mechanism; the lubricating oil tank cooling mechanism includes: a lubricating oil tank 12, the lubricating oil tank 12 having an integrated evaporating coil, the inlet of the evaporating coil being connected to the outlet of the cooling channel 4, for receiving liquid non-azeotropic working fluid from the magnetic refrigeration module; the evaporating coil is immersed in the lubricating oil in the lubricating oil tank 12, absorbing heat from the lubricating oil through the phase change process of the liquid non-azeotropic working fluid, cooling it and simultaneously generating gaseous non-azeotropic working fluid; the outlet of the evaporating coil... The inlet is connected to the inlet of the first condenser 8. The gaseous non-azeotropic working fluid enters the first condenser 8 through the outlet of the evaporator coil for condensation and recovery. A lubricating oil pump 13 is installed in the lubricating oil tank 12. The lubricating oil pump 13 is connected to the synchronous condenser through the oil inlet pipe. The synchronous condenser is connected back to the lubricating oil tank 12 through the oil return pipe. The lubricating oil pump 13 pumps the lubricating oil out of the lubricating oil tank 12 and delivers it to the bearings, gears and other parts of the synchronous condenser that need lubrication through the oil inlet pipe. After completing the lubrication task, the lubricating oil flows back to the lubricating oil tank 12.

[0034] The outlet of the cooling channel 4 includes a gas phase outlet and a liquid phase outlet. The gas phase outlet of the cooling channel 4 is connected to the inlet of the first condenser 8 and is used to transfer the gaseous non-azeotropic working fluid output from the cooling channel 4 to the first condenser 8 for condensation. The liquid phase outlet of the cooling channel 4 is connected to the inlet of the evaporator coil and is used to transfer the liquid non-azeotropic working fluid output from the cooling channel 4 to the evaporator coil for heat exchange with the lubricating oil.

[0035] It also includes an auxiliary condensation mechanism; the auxiliary condensation mechanism includes:

[0036] The second condenser 14 has its inlet connected to the outlet of the first gas-liquid separator 6, and is used to receive the gaseous non-azeotropic working fluid separated from the first gas-liquid separator 6.

[0037] The second gas-liquid separator 15 has its inlet connected to the outlet of the second condenser 14. The second gas-liquid separator 15 is provided with a gas phase outlet and a liquid phase outlet. The gas phase outlet of the second gas-liquid separator 15 is connected to the inlet of the second condenser 14, and the liquid phase outlet of the second gas-liquid separator 15 is connected to the inlet of the refrigerant pump 7.

[0038] The cooling tower 10 and the circulating water pump 11 that drives the cooling tower 10 are connected in a heat exchange manner with the second condenser 14 to remove the heat released by the second condenser 14.

[0039] The first gas-liquid separator 6 has a gas phase outlet and a liquid phase outlet. The gas phase outlet of the first gas-liquid separator 6 is connected to the inlet of the second condenser 14 and is used to transfer the gaseous non-azeotropic working fluid separated from itself to the second condenser 14 for condensation. The liquid phase outlet of the first gas-liquid separator 6 is connected to the inlet of the refrigerant pump 7 and is used to transfer the liquid non-azeotropic working fluid separated from itself to the refrigerant pump 7.

[0040] The magnetic cooling module is directly embedded in the bar slot of the stator core 3 of the synchronous condenser, or closely attached to the end of the stator winding 2.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A phase condenser cooling system based on a non-azeotropic working fluid and magnetic refrigeration, characterized in that, include: The magnetic refrigeration cycle mechanism is connected to the stator of the camera converter and is used to dissipate heat from the stator of the camera converter; the magnetic refrigeration cycle loop is filled with a non-azeotropic working fluid. The magnetic refrigeration cycle mechanism includes: A magnetic cooling module is installed in the stator section of a synchronous condenser, exchanging heat with the stator windings and stator core. The magnetic cooling module contains a magnetic working fluid bed made of magnetocaloric material and cooling channels for the flow of a non-azeotropic working fluid mixture. The magnetic working fluid bed is in close contact with the stator windings and stator core via highly thermally conductive adhesive or metal thermally conductive pads. The cooling channels are arranged either embedded inside the magnetic working fluid bed or surrounding it, exchanging heat with the magnetic working fluid bed through the channel walls. This allows the flowing non-azeotropic working fluid mixture to absorb heat from the stator region, undergo a phase change, and generate a non-azeotropic working fluid mixture in both gaseous and liquid states. An external magnetic field conditioning system is provided on one side or around the magnetic refrigeration module to assist in the conditioning of the alternating magnetic field of the magnetic working fluid bed. The first condenser and the axial fan that provides cooling airflow to the first condenser are connected at the inlet of the first condenser to the outlet of the working fluid of the magnetic refrigeration module, i.e., the outlet of the cooling channel, to receive and condense the gaseous non-azeotropic working fluid. A first gas-liquid separator, wherein the inlet of the first gas-liquid separator is connected to the outlet of the first condenser; A refrigerant pump, the inlet of which is connected to the outlet of the first gas-liquid separator; the outlet of the refrigerant pump is connected to the inlet of the cooling channel.

2. The phase-shifting cooling system based on a non-azeotropic working fluid and magnetic refrigeration according to claim 1, characterized in that: It also includes a lubricating oil tank cooling mechanism; a lubricating oil tank, the inside of which is integrated with an evaporating coil, the inlet of which is connected to the outlet of the cooling channel; the evaporating coil is immersed in the lubricating oil in the lubricating oil tank; the outlet of the evaporating coil is connected to the inlet of the first condenser; a lubricating oil pump is installed in the lubricating oil tank, the lubricating oil pump is connected to a synchronous condenser through an oil inlet pipe, and the synchronous condenser is connected back to the lubricating oil tank through a return oil pipe.

3. The phase-shifting cooling system based on a non-azeotropic working fluid and magnetic refrigeration according to claim 2, characterized in that: It also includes an auxiliary condensation mechanism; the auxiliary condensation mechanism includes: The second condenser has its inlet connected to the outlet of the first gas-liquid separator and is used to receive the gaseous non-azeotropic working fluid that is separated from the first gas-liquid separator. The second gas-liquid separator has an inlet connected to the outlet of the second condenser. The second gas-liquid separator is provided with a gas phase outlet and a liquid phase outlet. The gas phase outlet of the second gas-liquid separator is connected to the inlet of the second condenser, and the liquid phase outlet of the second gas-liquid separator is connected to the inlet of the refrigerant pump. The cooling tower and the circulating water pump that drives the cooling tower are connected in a heat exchange manner with the second condenser to remove the heat released by the second condenser.

4. A phase-shifting cooling system based on a non-azeotropic working fluid and magnetic refrigeration according to claim 3, characterized in that: The magnetic cooling module is directly embedded in the bar slot of the stator core of the synchronous condenser, or closely attached to the end of the stator winding.

5. A phase-shifting cooling system based on a non-azeotropic working fluid and magnetic refrigeration according to claim 4, characterized in that: The cooling channel outlet includes a gas phase outlet and a liquid phase outlet. The gas phase outlet of the cooling channel is connected to the inlet of the first condenser and is used to transfer the gaseous non-azeotropic working fluid output from the cooling channel to the first condenser for condensation. The liquid phase outlet of the cooling channel is connected to the inlet of the evaporator coil and is used to transfer the liquid non-azeotropic working fluid output from the cooling channel to the evaporator coil for heat exchange with the lubricating oil.

6. A phase-shifting cooling system based on a non-azeotropic working fluid and magnetic refrigeration according to claim 5, characterized in that: The outlet of the first gas-liquid separator includes a gas phase outlet and a liquid phase outlet. The gas phase outlet of the first gas-liquid separator is connected to the inlet of the second condenser and is used to transfer the gaseous non-azeotropic working fluid separated from itself to the second condenser for condensation. The liquid phase outlet of the first gas-liquid separator is connected to the inlet of the refrigerant pump and is used to transfer the liquid non-azeotropic working fluid separated from itself to the refrigerant pump.

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