A closed-air cooling system for synchronous condensers

Abstract

This invention proposes a closed-loop air cooling system for synchronous condensers, belonging to the field of large-scale power equipment cooling technology. It solves the problem that in harsh environments, existing open-loop air cooling methods allow pollutants such as dust, salt, and moisture from the outside air to directly enter the motor, leading to decreased insulation performance, component corrosion, and severely impacting equipment lifespan and reliability. It includes a first housing with an internal circulation duct; a second housing with an external circulation duct; a heat exchange core fixedly installed within the first housing for heat exchange between the air flowing through the internal and external circulation ducts; an internal circulation fan connected to the internal circulation duct to drive the air inside the synchronous condenser to form an internal circulation airflow; and an external circulation fan connected to the external circulation duct. It is primarily used for cooling the synchronous condenser.

Description

Technical Field

[0001] This invention belongs to the field of cooling technology for large power equipment, and in particular relates to a closed-loop air cooling system for synchronous condensers. Background Technology

[0002] Synchronous condensers are key devices in power systems used to provide dynamic reactive power support and stabilize grid voltage. During operation, the stator, rotor windings, and core generate a large amount of heat, which must be removed through an effective cooling system to ensure long-term safe and stable operation of the equipment within the allowable temperature range.

[0003] Traditional cooling methods include water cooling and open-air cooling. Water cooling suffers from problems such as complex piping, susceptibility to leaks and scaling, and the risk of freezing in extremely cold regions. It also requires high-quality water and involves significant maintenance. Open-air cooling directly introduces ambient air into the motor. While structurally simple, in harsh environments such as windy sandstorms, salt spray, and high altitudes, dust, salt, moisture, and other pollutants from the outside air can directly enter the motor, leading to decreased insulation performance, component corrosion, and severely impacting equipment lifespan and reliability. Summary of the Invention In view of this, the present invention aims to propose a closed-loop air cooling system for synchronous condensers, in order to solve the problem that in the case of open-loop air cooling in the prior art, pollutants such as dust, salt, and moisture in the outside air can directly enter the motor in harsh environments, leading to a decrease in insulation performance, corrosion of components, and seriously affecting the life and reliability of the equipment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A closed-loop air cooling system for a synchronous camera includes: A first housing, wherein an internal circulation air duct is provided inside the first housing; The second housing has an external circulation air duct inside. The heat exchange core is fixedly installed inside the first housing and is used to exchange heat between the air flowing through the inner and outer circulation ducts on both sides of it. An internal circulation fan, connected to an internal circulation duct, is used to drive the air inside the synchronous condenser to form an internal circulation airflow. The internal circulation airflow flows through the first side of the heat exchange core and then returns to the inside of the synchronous condenser. An external circulation fan, connected to an external circulation duct, is used to drive ambient air to form an external circulation airflow. The external circulation airflow flows through the heat exchange core and is discharged to the environment on the second side opposite to the first side.

[0005] Furthermore, the heat exchange core has a plate-fin structure, the fin material is corrosion-resistant aluminum alloy, and the fins have undergone surface strengthening treatment.

[0006] Furthermore, the internal circulation fan and / or the external circulation fan are variable frequency speed control fans.

[0007] Furthermore, the air outlet and air inlet of the internal circulation duct are respectively equipped with an internal circulation air outlet thermal resistor and an internal circulation air inlet thermal resistor, and the air outlet and air inlet of the external circulation duct are respectively equipped with an external circulation air outlet thermal resistor and an external circulation air inlet thermal resistor.

[0008] Furthermore, it also includes a control system that adjusts the speed of the internal circulation fan and / or the external circulation fan based on the temperatures detected by the internal circulation outlet heat resistor, the internal circulation inlet heat resistor, the external circulation outlet heat resistor, and the external circulation inlet heat resistor.

[0009] Furthermore, the air inlet of the external circulation duct is sequentially equipped with rainproof louvers, insect-proof nets, and an air filter.

[0010] Furthermore, it also includes differential pressure switches, which are located on both sides of the air filter to detect filter blockage and trigger alarm signals.

[0011] Furthermore, an inspection door is provided at the position of the first housing corresponding to the heat exchange core.

[0012] Furthermore, both the bottom of the first and second housings are equipped with shock-absorbing devices.

[0013] Furthermore, maintenance platforms are provided on both sides of the first and second housings.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The internal and external air ducts are completely physically isolated, ensuring that the motor is free of dust, corrosion, and condensation. This makes it particularly suitable for harsh environments such as water shortage, extreme cold, high altitude, windy sandstorms, and salt spray, greatly extending the service life of the synchronous condenser.

[0015] 2. It adopts a combination of high-efficiency plate-fin heat exchange core and variable frequency fan intelligent adjustment, which has high heat exchange efficiency and can optimize energy consumption in real time according to the load, resulting in significant economic benefits.

[0016] 3. No water treatment system required, no risk of leakage, scaling, or freezing; core heat exchange components are maintenance-free, requiring only periodic cleaning or replacement of the external circulation filter, making maintenance simple and downtime short.

[0017] 4. It integrates multiple monitoring and alarm functions such as temperature and differential pressure, and can be connected to the unit's main control system to realize remote monitoring and intelligent operation and maintenance. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a closed-loop air-cooling system for synchronous conversion according to the present invention. Figure 1 ; Figure 2 This is a diagram showing the airflow pattern of the internal circulation system. Figure 3 This is a diagram showing the airflow trend of the external circulation system. Figure 4 This is a schematic diagram of the structure of a closed-loop air-cooling system for synchronous conversion according to the present invention. Figure 2 ; Figure 5 This is an internal schematic diagram of a closed-loop air-cooling system for synchronous conversion according to the present invention.

[0019] In the diagram: 1-First housing, 2-Second housing, 3-Maintenance ladder and platform, 4-Internal circulation fan, 5-External circulation inlet heat resistor, 6-External circulation fan, 7-Heat exchange core, 8-Internal circulation outlet heat resistor, 9-Internal circulation inlet heat resistor, 10-External circulation outlet heat resistor. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0021] Specific Implementation Method 1: Referring to the figure, this implementation method describes a closed-loop air-cooling system for synchronous condensers, comprising: A first housing 1, wherein an internal circulation air duct is provided inside the first housing 1; The second housing 2 is provided with an external circulation air duct; The heat exchange core 7 is fixedly installed inside the first housing 1 and is used to exchange heat between the air flowing through the inner and outer circulation ducts on both sides of it. The internal circulation fan 4 is connected to the internal circulation duct and is used to drive the air inside the synchronous condenser to form an internal circulation airflow. The internal circulation airflow flows through the first side of the heat exchange core 7 and then returns to the inside of the synchronous condenser. The external circulation fan 6 is connected to the external circulation duct and is used to drive the ambient air to form an external circulation airflow. The external circulation airflow flows through the heat exchange core 7 and the second side opposite to the first side before being discharged to the environment.

[0022] The system adopts a completely isolated dual-air duct structure. The first shell 1 and the second shell 2 are combined into an integral shell structure. The internal air circulation duct and the external air circulation duct are separated by a partition. The air medium in the two air ducts only exchanges heat through the metal wall at the heat exchange core 7, without any direct flow or mixing, ensuring the cleanliness of the system.

[0023] The internal circulation duct is a completely closed loop. After the internal circulation fan 4 is started, it draws in the high-temperature air generated inside the synchronous condenser due to its operation and forces it to flow through the first side of the heat exchange core 7. Here, the heat is transferred to the other side through the heat exchange fins. The cooled clean air is then sent back into the synchronous condenser to continuously cool its windings and iron core, forming a closed clean circulation of internal air, which completely prevents the intrusion of external dust, salt spray, and moisture.

[0024] The external circulation duct is an open circulation system, with the external circulation fan 6 drawing in low-temperature air from the environment. Before entering the duct, the air undergoes preliminary purification through a series of rainproof louvers, insect screens, and air filters to protect the heat exchange core 7 from large particulate matter contamination. The purified cold air flows through the second side of the heat exchange core 7, absorbs heat from the internal circulation air, becomes hot air, and is directly discharged into the atmosphere, completing the final heat transfer.

[0025] The internal circulation fan 4 and the external circulation fan 6 are driven by variable frequency motors. The system is equipped with a control system that can be integrated into the synchronous condenser DCS / PLC. The control system detects the temperatures of the internal circulation outlet thermal resistor 8, the internal circulation inlet thermal resistor 9, the external circulation outlet thermal resistor 10, and the external circulation inlet thermal resistor 5. When the internal circulation air temperature rises, the control system can automatically increase the speed of the internal circulation fan 4 and / or the external circulation fan 6 to increase the air volume and enhance cooling. When the load decreases and the temperature drops, the fan speed is automatically reduced to achieve on-demand matching of cooling capacity, resulting in significant energy saving and noise reduction effects. The power consumption during operation can be significantly reduced compared to traditional equipment.

[0026] In addition, differential pressure switches are installed on both sides of the air filter. When the pressure difference between the front and rear of the filter exceeds the set value due to dust accumulation, the differential pressure switch triggers an alarm signal to remind maintenance personnel to clean or replace the filter screen and ensure the external air circulation volume. A maintenance door with a sealing gasket is opened on the housing to facilitate the blowing or cleaning of the heat exchange core 7. The entire system is mounted on the foundation through a shock-absorbing device at the bottom to reduce vibration transmission.

[0027] The cooling method of this system is based on the above system: synchronously start and stop the internal and external circulation to form two independent heat exchange cycles coupled through the heat exchange core 7, so as to efficiently and cleanly transfer the heat inside the motor to the external environment.

[0028] The specific embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A closed-air cooling system for synchronous condensers, characterized by: include: The first housing (1) is provided with an internal circulation air duct; The second housing (2) is provided with an external circulation air duct; The heat exchange core (7) is fixedly installed in the first housing (1) and the second housing (2) to exchange heat between the air flowing through the inner and outer circulation ducts on both sides of it. The internal circulation fan (4) is connected to the internal circulation duct and is used to drive the air inside the synchronous condenser to form an internal circulation airflow. The internal circulation airflow flows through the first side of the heat exchange core (7) and then returns to the inside of the synchronous condenser. The external circulation fan (6) is connected to the external circulation duct and is used to drive the ambient air to form an external circulation airflow. The external circulation airflow flows through the heat exchange core (7) and the second side opposite to the first side before being discharged to the environment.

2. A closed-air cooling system for synchronous condensers as claimed in claim 1, wherein: The heat exchange core (7) is a plate-fin structure, the fin material is corrosion-resistant aluminum alloy, and the fins have undergone surface strengthening treatment.

3. A closed-air cooling system for synchronous condensers as claimed in claim 1, wherein: The internal circulation fan (4) and / or external circulation fan (6) are variable frequency speed control fans.

4. A closed-loop air-cooling system for synchronous conversion cameras according to claim 1, characterized in that: The air outlet and air inlet of the internal circulation duct are respectively equipped with an internal circulation air outlet thermal resistor (8) and an internal circulation air inlet thermal resistor (9), and the air outlet and air inlet of the external circulation duct are respectively equipped with an external circulation air outlet thermal resistor (10) and an external circulation air inlet thermal resistor (5).

5. A closed-loop air-cooling system for synchronous conversion cameras according to claim 1, characterized in that: It also includes a control system that adjusts the speed of the internal circulation fan (4) and / or the external circulation fan (6) based on the temperature detected by the internal circulation outlet heat resistor (8), the internal circulation inlet heat resistor (9), the external circulation outlet heat resistor (10) and the external circulation inlet heat resistor (5).

6. A closed-loop air-cooling system for synchronous conversion cameras according to claim 1, characterized in that: The air inlet of the external circulation duct is equipped with rainproof louvers, insect-proof nets, and an air filter in sequence.

7. A closed-loop air-cooling system for synchronous conversion cameras according to claim 1, characterized in that: It also includes differential pressure switches, which are located on both sides of the air filter and are used to detect filter blockage and trigger alarm signals.

8. A closed-loop air-cooling system for synchronous conversion cameras according to claim 1, characterized in that: Inspection doors are provided on the first housing (1) and the second housing (2) at positions corresponding to the heat exchange core (7).

9. A closed-loop air-cooling system for synchronous conversion cameras according to claim 1, characterized in that: Both the bottom of the first housing (1) and the second housing (2) are provided with shock-absorbing devices.

10. A closed-loop air-cooling system for synchronous conversion cameras according to claim 1, characterized in that: Maintenance platforms (3) are provided on both sides of the first housing (1) and the second housing (2).

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