Heat exchange system of water-turbine generator set and control method of heat exchange system

Abstract

The invention relates to the technical field of heat exchange, particularly provides a heat exchange system of a water-turbine generator set and a control method of the heat exchange system, and aims to solve the problem of potential safety hazards caused by condensation on the surface of an air cooler in the operation process of the water-turbine generator set. In order to achieve the purpose, the heat exchange system of the water-turbine generator set comprises an evaporative cooling device used for cooling a stator winding of the water-turbine generator set, and the evaporative cooling device comprises a condenser; the air cooler is arranged on the outer side of a stator winding of the water-turbine generator set; the bridging pipeline is arranged between the condenser and the air cooler in a communicating manner; the main liquid inlet pipeline is communicated with the condenser or the bridging pipeline and is used for introducing cooling liquid into the condenser and the air cooler; and the main liquid discharging pipeline communicates with the air cooler or the bridging pipeline and is used for discharging the cooling liquid in the condenser and the air cooler. The condensation phenomenon on the surface of the air cooler can be improved, and therefore potential safety hazards are reduced.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and specifically provides a heat exchange system of a hydro-turbine generator set and a control method thereof. Background Art

[0002] A hydroelectric generator is a generator that uses a water turbine as the prime mover to convert water energy into electrical energy. During the operation of a hydroelectric generator, its internal functional components, such as the stator bars, the excitation winding on the rotor, and the brushes and collector rings of the generator, will continuously generate heat. At the same time, the rotor will also generate heat due to mechanical friction and air friction during rotation. Therefore, the generator needs to be cooled in time during operation to ensure the normal operation of the generator.

[0003] In order to ensure cooling efficiency, in some related technologies, evaporative cooling devices and air coolers are arranged in the operating hydro-turbine generator sets. Generally, the cooling of the stator winding is taken away by the evaporative cooling device, and the heat generated by the rotor and other components is taken away by the air cooler. However, during the operation of the hydro-turbine generator set, when the temperature of the coolant entering the air cooler is too different from the air inlet temperature of the air cooler, condensation will occur on the surface of the air cooler, which will cause rust on the equipment during long-term operation. In severe cases, condensation may even affect the insulation of the internal electrical system of the generator set, causing safety hazards.

[0004] Accordingly, the art needs a new technical solution to solve the above problems. Summary of the invention

[0005] The present application aims to solve the above technical problem, that is, to solve the problem of potential safety hazards caused by condensation on the surface of the air cooler during the operation of the hydro-generator set.

[0006] In a first aspect, the present application provides a heat exchange system for a hydro-generator set, comprising:

[0007] An evaporative cooling device, which is used to cool the stator winding of the hydro-generator set, and the evaporative cooling device includes a condenser;

[0008] An air cooler, which is arranged outside the stator winding of the hydro-generator set;

[0009] A bridge pipe, which is connected between the condenser and the air cooler;

[0010] A main liquid inlet pipeline, which is in communication with the condenser or the bridge pipeline and is used to introduce cooling liquid into the condenser and the air cooler;

[0011] A total liquid discharge pipeline is communicated with the air cooler or the bridge pipeline and is used for discharging the coolant in the condenser and the air cooler.

[0012] In a technical solution of the above heat exchange system, the bridge pipe includes a series pipe connected between the condenser and the air cooler, and the series pipe connects the condenser and the air cooler in series;

[0013] The total liquid inlet pipeline is communicated with the condenser, and the total liquid discharge pipeline is communicated with the air cooler.

[0014] In a technical solution of the above heat exchange system, a reversing valve is provided on the main liquid inlet pipeline or the main liquid discharge pipeline, and the reversing valve is used to control the coolant to achieve forward and reverse flow.

[0015] In a technical solution of the above heat exchange system, the heat exchange system further includes:

[0016] A temperature sensor, which is used to detect the ambient temperature;

[0017] A first controller is respectively connected to the temperature sensor and the reversing valve for communication, and the first controller controls the flow direction of the coolant according to the detection value of the temperature sensor.

[0018] In a technical solution of the above heat exchange system, the bridge pipe comprises:

[0019] a first liquid inlet pipeline and a second liquid inlet pipeline, wherein the first liquid inlet pipeline is communicated with the condenser, the second liquid inlet pipeline is communicated with the air cooler, and the total liquid inlet pipeline is communicated with the first liquid inlet pipeline and the second liquid inlet pipeline respectively, so as to connect the first liquid inlet pipeline and the second liquid inlet pipeline in parallel;

[0020] a first drain pipeline and a second drain pipeline, wherein the first drain pipeline is connected in series with the condenser and the first liquid inlet pipeline, the second drain pipeline is connected in series with the air cooler and the second liquid inlet pipeline, and the total drain pipeline is connected to the first drain pipeline and the second drain pipeline respectively, so as to connect the first drain pipeline and the second drain pipeline in parallel;

[0021] A flow regulating element is connected and arranged at the intersection of the main liquid inlet pipeline, the first liquid inlet pipeline and the second liquid inlet pipeline, and is used to regulate the flow of coolant entering the first liquid inlet pipeline and the second liquid inlet pipeline.

[0022] In a technical solution of the above heat exchange system, the heat exchange system further includes:

[0023] A temperature sensor, which is used to detect the ambient temperature;

[0024] The second controller is respectively connected to the temperature sensor and the flow regulating element for communication, and the second controller controls the working state of the flow regulating element according to the detection value of the temperature sensor.

[0025] In a second aspect, the present application provides a control method for a heat exchange system of a hydro-generator set, the heat exchange system comprising: an evaporative cooling device for cooling a stator winding of the hydro-generator set, the evaporative cooling device comprising a condenser;

[0026] An air cooler, which is arranged outside the stator winding of the hydro-generator set;

[0027] A bridge pipe, comprising a series pipe connected between the condenser and the air cooler, wherein the series pipe connects the condenser and the air cooler in series;

[0028] A total liquid inlet pipeline and a total liquid discharge pipeline, wherein the total liquid inlet pipeline is communicated with the condenser, and the total liquid discharge pipeline is communicated with the air cooler; wherein a reversing valve is provided on the total liquid inlet pipeline or the total liquid discharge pipeline;

[0029] The control method comprises:

[0030] Get the ambient temperature;

[0031] The working state of the reversing valve is controlled according to the ambient temperature to adjust the flow direction of the coolant.

[0032] In a technical solution of the above control method, the step of "controlling the working state of the reversing valve according to the ambient temperature to adjust the flow direction of the coolant" includes:

[0033] When the ambient temperature is less than a first preset value, controlling the working state of the reversing valve so that the coolant first enters the condenser and then enters the air cooler; and / or

[0034] When the ambient temperature is greater than or equal to a first preset value, the working state of the reversing valve is controlled so that the coolant first enters the air cooler and then enters the condenser.

[0035] In a third aspect, the present application provides a control method for a heat exchange system of a hydro-generator set, the heat exchange system comprising: an evaporative cooling device for cooling a stator winding of the hydro-generator set, the evaporative cooling device comprising a condenser;

[0036] An air cooler, which is arranged outside the stator winding of the hydro-generator set;

[0037] A bridge pipeline, comprising a first liquid inlet pipeline, a second liquid inlet pipeline, a first liquid drain pipeline and a second liquid drain pipeline, wherein the first liquid inlet pipeline is connected to the condenser, the second liquid inlet pipeline is connected to the air cooler, the first liquid drain pipeline is connected in series with the condenser and the first liquid inlet pipeline, and the second liquid drain pipeline is connected in series with the air cooler and the second liquid inlet pipeline;

[0038] a main liquid inlet pipeline, which is communicated with the first liquid inlet pipeline and the second liquid inlet pipeline respectively, so as to connect the first liquid inlet pipeline and the second liquid inlet pipeline in parallel;

[0039] a main liquid discharge pipeline, which is communicated with the first liquid discharge pipeline and the second liquid discharge pipeline respectively, so as to connect the first liquid discharge pipeline and the second liquid discharge pipeline in parallel;

[0040] a flow regulating element, which is connected and arranged at the intersection of the main liquid inlet pipeline, the first liquid inlet pipeline and the second liquid inlet pipeline, and is used to regulate the flow of coolant entering the first liquid inlet pipeline and the second liquid inlet pipeline;

[0041] The control method comprises:

[0042] Get the ambient temperature;

[0043] The working state of the flow regulating element is controlled according to the ambient temperature to respectively regulate the flow of the coolant entering the condenser and the air cooler.

[0044] In a technical solution of the above control method, the step of "controlling the working state of the flow regulating element according to the ambient temperature to respectively regulate the flow of the coolant entering the condenser and the air cooler" includes:

[0045] When the ambient temperature is lower than a second preset value, the working state of the flow regulating element is controlled so that the flow rate of the coolant entering the condenser is greater than the flow rate of the coolant entering the air cooler; and / or

[0046] When the ambient temperature is greater than or equal to a second preset value, the working state of the flow regulating element is controlled so that the flow rate of the coolant entering the condenser is smaller than the flow rate of the coolant entering the air cooler.

[0047] As mentioned above, when adopting the above technical solution, the present application connects the condenser and the air cooler through a bridge pipeline. By controlling the flow direction or flow distribution of the coolant, it can improve the phenomenon of condensation on the surface of the air cooler caused by too low a coolant temperature. At the same time, it can also achieve energy-saving effects while meeting the heat dissipation requirements, and prevent waste caused by "overflow" of cold. Moreover, compared with the independent operation of the condenser and the air cooler in the prior art, the present application connects the condenser and the air cooler as one, simplifies the piping system, and makes the piping system more compact. The condenser and the air cooler share the total liquid inlet pipeline and the total liquid discharge pipeline, and only a power device that provides circulation power needs to be set up externally, thereby further improving the energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, in which:

[0049] Figure 1 It is a schematic diagram of the existing heat exchange system of a hydro-generator set;

[0050] Figure 2 is a schematic diagram of a heat exchange system of a hydro-generator set according to an embodiment of the present application;

[0051] Figure 3 Yes Figure 2 Schematic diagram when the central main liquid inlet pipeline and the main liquid discharge pipeline are both arranged at the upper part of the machine pit;

[0052] Figure 4 Yes Figure 2 Schematic diagram when the central main liquid inlet pipeline and the main liquid discharge pipeline are both arranged at the lower part of the machine pit;

[0053] Figure 5 is a schematic diagram of a heat exchange system of a hydro-generator set according to another embodiment of the present application;

[0054] Figure 6 is a flow chart of a method for controlling a heat exchange system according to an embodiment of the present application;

[0055] Figure 7 is a flow chart of a method for controlling a heat exchange system according to another embodiment of the present application.

[0056] In the figures, the reference numerals refer to the following:

[0057] 100, cooling device; 101, main circuit structure; 102, condenser; 103, condenser liquid inlet pipe; 104, condenser liquid discharge pipe; 200, air cooler; 201, air cooler liquid inlet pipe; 202, air cooler liquid discharge pipe;

[0058] 1. Evaporative cooling device; 11. Main circuit structure; 12. Condenser; 2. Air cooler; 3. Main liquid inlet pipeline; 4. Main liquid discharge pipeline; 5. Series pipeline; 61. First liquid inlet pipeline; 62. Second liquid inlet pipeline; 63. First liquid discharge pipeline; 64. Second liquid discharge pipeline; 7. Reversing valve; 8. Flow regulating element. DETAILED DESCRIPTION

[0059] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not used to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0060] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, the ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] In order to facilitate understanding of the technical solution of this application, first, refer to Figure 1, briefly introduce the existing heat exchange system of the hydro-turbine generator set. The heat exchange system of the hydro-turbine generator set usually includes an evaporative cooling device 100 and an air cooler 200. The evaporative cooling device 100 includes a main circuit structure 101 arranged in the stator winding of the hydro-turbine generator set and a condenser 102 arranged on the upper part of the machine pit. The main circuit structure 101 is connected to the inside of the condenser 102 to form a first circulation loop. The condenser 102 is also connected with a condenser liquid inlet pipe 103 and a condenser liquid discharge pipe 104. The condenser liquid inlet pipe 103 and the condenser liquid discharge pipe 104 are connected to the external first liquid supply device to form a second circulation loop. The coolant in the first liquid supply device (also called secondary cooling water in this field) flows in the second circulation loop to take away the system heat. The air cooler 200 is connected with an air cooler liquid inlet pipe 201 and an air cooler liquid discharge pipe 202, which are connected to an external second liquid supply device to form an air cooling circulation loop, and the coolant in the second liquid supply device flows in the air cooling circulation loop to take away the system heat.

[0063] As can be seen from the above, the circulation loop of the condenser 102 and the circulation loop of the air cooler 200 are two independent loops, and the two operate independently without affecting each other. However, in the actual operation of the hydro-generator set, the temperature of the coolant at the ambient temperature will be directly affected by factors such as seasonal temperature changes and day and night temperature changes. When the external ambient temperature is too low and the coolant temperature drops significantly, the coolant temperature will form a large difference with the air inlet temperature of the air cooler 200. When the temperature difference is large, it will cause condensation on the surface of the air cooler 200.

[0064] Reference Figure 2 , is a heat exchange system of a hydro-generator set according to an embodiment of the present application, which includes an evaporative cooling device 1, an air cooler 2, and a pipeline structure connecting the evaporative cooling device 1 and the air cooler 2.

[0065] Specifically, the evaporative cooling device 1 includes a main circuit structure 11 and a condenser 12. The main circuit structure 11 is arranged in the stator winding of the hydro-generator set, and both ends of the main circuit structure 11 are connected to the condenser 12, so that a first circulation loop for the circulation of the phase-changing working medium is formed between the main circuit structure 11 and the inside of the condenser 12. This is a well-known technology in the art, and this application will not be described in detail here. The above-mentioned pipeline structure includes a bridge pipeline connected between the condenser 12 and the air cooler 2, as well as a total liquid inlet pipeline 3 and a total liquid discharge pipeline 4.

[0066] In this application Figure 2In the illustrated embodiment, the bridge pipe includes a series pipe 5 connected between the condenser 12 and the air cooler 2, and the series pipe 5 connects the condenser 12 and the air cooler 2 in series. The total liquid inlet pipe 3 is connected to the condenser 12, that is, the two ports of the condenser 12 are respectively connected to the total liquid inlet pipe 3 and the series pipe 5. The total liquid discharge pipe 4 is connected to the air cooler 2, that is, the two ports of the air cooler 2 are respectively connected to the total liquid discharge pipe 4 and the series pipe 5. In actual engineering applications, the total liquid inlet pipe 3 is connected to an external liquid supply device, and the coolant in the external liquid supply device is passed into the condenser 12 and the air cooler 2 through the total liquid inlet pipe 3. The total liquid discharge pipe 4 is also connected to the external liquid supply device, and the coolant in the condenser 12 and the air cooler 2 can be discharged to the external liquid supply device, so that the condenser 12 and the air cooler 2 form a series circulation loop.

[0067] As mentioned above, the heat exchange system of the present application is adopted, the condenser 12 is connected in series with the air cooler 2, and during the operation of the hydro-turbine generator set, the external coolant first enters the condenser 12 and then enters the air cooler 2 through the total liquid inlet pipeline 3, and is finally discharged through the total liquid discharge pipeline 4. In this process, the coolant first exchanges heat with the condenser 12, and the temperature of the coolant is initially increased when entering the air cooler 2, and then the coolant exchanges heat with the air cooler 2 again. In this way, the coolant presents a certain temperature gradient along its flow path, which can not only improve the phenomenon of condensation on the surface of the air cooler 2 caused by the coolant temperature being too low, but also based on the heat distribution of each functional part in the hydro-turbine generator set, the coolant temperature is stepped. On the premise of meeting the heat dissipation requirements, it can also achieve energy-saving effects and prevent waste caused by "overflow" of cold.

[0068] On the other hand, compared with the prior art in which the condenser 12 and the air cooler 2 operate independently, the present application connects the condenser 12 and the air cooler 2 as one body, thus simplifying the piping system and making the piping system more compact. Moreover, the condenser 12 and the air cooler 2 share the total liquid inlet pipe 3 and the total liquid discharge pipe 4, and only a power device providing circulation power needs to be set up externally, thereby further improving the energy-saving effect.

[0069] Reference Figure 1 A reversing valve 7 is also provided on the main liquid inlet pipeline 3. The reversing valve 7 is a directional control valve with two or more flow forms, which can change the flow direction and flow rate of the fluid, thereby controlling the coolant to flow in both the forward and reverse directions.

[0070] Thus, in actual engineering applications, the flow direction of the coolant can be controlled according to the influencing factors such as the ambient temperature, the air inlet temperature of the air cooler, and the heat distribution inside the hydro-turbine generator set, so that the coolant flows through the condenser 12 first or flows through the air cooler 2 first, thereby realizing the step-by-step utilization of the coolant temperature more reasonably according to actual needs. This is because, in actual engineering applications, the way in which the coolant flows through the condenser 12 first is not always the best choice. For example, under the influence of the structural design of the hydro-turbine generator set itself, under certain specific conditions, the condenser 12 does not need too much cooling capacity for secondary cooling. At this time, the coolant can be made to flow through the air cooler 2 first by controlling the working state of the reversing valve 7. Or when the external ambient temperature is high, the secondary cooling on the condenser 12 side is less affected, and the coolant temperature is not much different from the air inlet temperature of the air cooler 2. At this time, it can be selected to make the coolant flow through the air cooler 2 first to cool the air temperature inside the hydro-turbine generator set, and then make the coolant flow through the condenser 12. Those skilled in the art can make corresponding adjustments according to actual needs.

[0071] It is understandable that, regarding the installation position of the reversing valve 7, it can also be installed on the main drain pipeline 4, which has no effect on the realization of bidirectional regulation.

[0072] In practical applications, the working state of the reversing valve 7 can be achieved by manual adjustment by the staff, or it can be automatically controlled by setting a sensor to detect the target parameters. Figure 2 In one implementation of the present application, the heat exchange system also includes a temperature sensor and a first controller. The temperature sensor is arranged outside the pit and can be used to detect the ambient temperature. The first controller is respectively communicated with the temperature sensor and the reversing valve 7. The first controller can control the working state of the reversing valve 7 according to the detection value of the temperature sensor, thereby realizing the regulation of the flow direction of the coolant.

[0073] Of course, those skilled in the art can also perform automatic control by detecting other parameters. For example, a temperature sensor can be used to directly detect the temperature of the coolant in the external liquid supply device, or a temperature sensor can be set inside the hydro-generator set to measure the internal air temperature. The coolant flow direction is controlled by the difference between the coolant temperature and the internal air temperature. When the difference is greater than a certain threshold, the coolant is allowed to flow through the condenser 12 first and then through the air cooler 2. As mentioned above, the adaptive adjustments made to the above-mentioned automatic adjustment method should be within the protection scope of this application.

[0074] Despite Figure 2 In the implementation shown, the total liquid inlet pipeline 3 is arranged at the upper part of the pit, and the total liquid discharge pipeline 4 is arranged at the lower part of the pit for exemplary description, but this does not constitute a limitation of the present application. Figure 3In one implementation, the total liquid inlet pipeline 3 and the total liquid discharge pipeline 4 can be arranged at the upper part of the machine pit. Figure 4 In another implementation, the total liquid inlet pipeline 3 and the total liquid discharge pipeline 4 can also be arranged at the lower part of the machine pit, and the series pipeline 5 can be extended downward in the vertical direction to the bottom of the air cooler 2. Those skilled in the art can adaptively adjust the specific positions of the total liquid inlet pipeline 3 and the total liquid discharge pipeline 4 according to the space layout requirements in the machine pit or the convenience of the pipeline layout.

[0075] Reference Figure 5 , as an implementation of the present application, it is different from the above-mentioned embodiment in that the bridge pipe is configured to connect the condenser 12 and the air cooler 2 in parallel. Specifically, the bridge pipe includes a first liquid inlet pipe 61, a second liquid inlet pipe 62, a first liquid drain pipe 63 and a second liquid drain pipe 64. The first liquid inlet pipe 61 is connected to the condenser 12, the second liquid inlet pipe 62 is connected to the air cooler 2, and the total liquid inlet pipe 3 is respectively connected to the first liquid inlet pipe 61 and the second liquid inlet pipe 62, so that the first liquid inlet pipe 61 and the second liquid inlet pipe 62 are connected in parallel. The first liquid drain pipe 63 is connected in series with the condenser 12 and the first liquid inlet pipe 61, the second liquid drain pipe 64 is connected in series with the air cooler 2 and the second liquid inlet pipe 62, and the total liquid drain pipe 4 is respectively connected to the first liquid drain pipe 63 and the second liquid drain pipe 64, so that the first liquid drain pipe 63 and the second liquid drain pipe 64 are connected in parallel.

[0076] A flow regulating element 8 is provided at the intersection of the main liquid inlet pipeline 3, the first liquid inlet pipeline 61 and the second liquid inlet pipeline 62. The flow regulating element 8 can be a functional component such as a throttle valve, a diverter valve, a flow control valve, etc., which can adjust the flow of coolant entering the first liquid inlet pipeline 61 and the second liquid inlet pipeline 62, or change the flow ratio of the first liquid inlet pipeline 61 and the second liquid inlet pipeline 62.

[0077] Thus, in actual engineering applications, the flow rate of the coolant entering the first liquid inlet pipeline 61 and the second liquid inlet pipeline 62 is controlled by the flow regulating element 8, and the cooling amount passing through the condenser 12 and the air cooler 2 can be controlled respectively, so that the technical effect similar to the above-mentioned "temperature step utilization" can also be achieved. For example, when the difference between the external environment temperature and the air inlet temperature of the air cooler 2 is large, the flow rate of the coolant entering the first liquid inlet pipeline 61 is controlled by the flow regulating element 8 to be greater than the coolant flow entering the second liquid inlet pipeline 62, so that the total cooling amount passing through the air cooler 2 per unit time is reduced, and the condensation phenomenon on the surface of the air cooler 2 can also be improved. Of course, the working state of the flow regulating element 8 can also be adaptively controlled according to other conditions such as heat distribution in the hydro-generator set.

[0078] The above-mentioned embodiments can also simplify the system structure, improve the utilization rate of the coolant and achieve the purpose of energy saving, and the present application will not elaborate on them in detail.

[0079] It can be understood that in order to achieve automatic control, when adopting the above embodiment, a temperature sensor for detecting the ambient temperature can also be set, and by setting a second controller, the second controller is respectively communicated with the temperature sensor and the flow regulating element 8, so that during the operation of the hydro-turbine generator set, the second controller controls the working state of the flow regulating element 8 according to the detection value of the temperature sensor.

[0080] The present application also discloses a control method for a heat exchange system of a hydro-generator set, referring to Figure 6 , is a flow chart of a control method for a heat exchange system according to an embodiment of the present application. It should be noted that: Figure 6 The embodiment shown is based on a heat exchange system when the bridge pipe is a series pipe ( Figure 2 The control method of the embodiment shown in the figure comprises the following steps:

[0081] S101: Acquire the ambient temperature.

[0082] In step S101, real-time monitoring of the ambient temperature can be achieved by setting a temperature sensor in the external environment.

[0083] S102: Controlling the working state of the reversing valve according to the ambient temperature to adjust the flow direction of the coolant.

[0084] Specifically, step S102 may include:

[0085] S1021: When the ambient temperature is lower than a first preset value, the working state of the reversing valve is controlled so that the coolant first enters the condenser and then enters the air cooler.

[0086] S1022: When the ambient temperature is greater than or equal to a first preset value, the working state of the reversing valve is controlled so that the coolant first enters the air cooler and then enters the condenser.

[0087] Among them, the above-mentioned first preset value can be determined according to actual needs. For example, the first preset value can be set to 18°C, 20°C, or 22°C. The specific value of the first preset value can also be determined based on the average value of the air temperature in the hydro-turbine generator set. This application does not impose any restrictions on this.

[0088] Reference Figure 7 , is a flow chart of a control method for a heat exchange system according to an embodiment of the present application. It should be noted that: Figure 7 The embodiment shown is based on the bridge pipe comprising four branch pipes, so that the heat exchange system ( Figure 5The control method of the embodiment shown in the figure comprises the following steps:

[0089] S201: Acquire the ambient temperature.

[0090] S202: Controlling the working state of the flow regulating element according to the ambient temperature to respectively regulate the flow of the coolant entering the condenser and the air cooler.

[0091] Specifically, step S102 may include:

[0092] S2021: When the ambient temperature is lower than a second preset value, the working state of the flow regulating element is controlled so that the flow rate of the coolant entering the condenser is greater than the flow rate of the coolant entering the air cooler.

[0093] S2022: When the ambient temperature is greater than or equal to a second preset value, the working state of the flow regulating element is controlled so that the flow rate of the coolant entering the condenser is less than the flow rate of the coolant entering the air cooler.

[0094] Similarly, the second preset value can be determined according to actual needs. For example, the second preset value can be set to 18°C, 20°C, or 22°C. The specific value of the second preset value can also be determined according to the average value of the air temperature in the hydro-generator set. The specific value of the second preset value can be the same as or different from the first preset value.

[0095] As for the temperature of the coolant, it is greatly affected by factors such as seasonal changes and the temperature difference between day and night, while the air temperature inside the hydro-turbine generator set is usually within a relatively stable range. The external ambient temperature plays a major role in whether condensation occurs on the surface of the air cooler 2. Therefore, the present application uses the external ambient temperature as the corresponding factor of the above-mentioned reversing valve or flow regulating element, but it does not constitute a limitation to the present application. In some other implementation methods, the above-mentioned step S101 or step S201 can also simultaneously detect the external ambient temperature and the air temperature inside the hydro-turbine generator set, and then in the corresponding step S102 or step S202, the difference between the external ambient temperature and the air temperature inside the hydro-turbine generator set is used as the response condition.

[0096] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A heat exchange system for a hydro-generator set, characterized in that: include: An evaporative cooling device (1) is used to cool a stator winding of a hydro-generator set, the evaporative cooling device (1) comprising a condenser (12); An air cooler (2) arranged outside the stator winding of the hydro-generator set; A bridge pipe, which is connected between the condenser (12) and the air cooler (2); A main liquid inlet pipeline (3), which is in communication with the condenser (12) or the bridge pipeline and is used for introducing cooling liquid into the condenser (12) and the air cooler (2); A total liquid discharge pipeline (4) is connected to the air cooler (2) or the bridge pipeline and is used to discharge the coolant in the condenser (12) and the air cooler (2).

2. The heat exchange system according to claim 1, characterized in that: The bridge pipe comprises a series pipe (5) connected between the condenser (12) and the air cooler (2), wherein the series pipe (5) connects the condenser (12) and the air cooler (2) in series; The total liquid inlet pipeline (3) is in communication with the condenser (12), and the total liquid discharge pipeline (4) is in communication with the air cooler (2).

3. The heat exchange system according to claim 2, characterized in that: A reversing valve (7) is provided on the main liquid inlet pipeline (3) or the main liquid discharge pipeline (4), and the reversing valve (7) is used to control the coolant to achieve forward and reverse flow.

4. The heat exchange system according to claim 3, characterized in that: The heat exchange system further comprises: A temperature sensor, which is used to detect the ambient temperature; A first controller is respectively connected to the temperature sensor and the reversing valve (7) for communication, and the first controller controls the flow direction of the coolant according to the detection value of the temperature sensor.

5. The heat exchange system according to claim 1, characterized in that: The bridge circuit comprises: a first liquid inlet pipeline (61) and a second liquid inlet pipeline (62), wherein the first liquid inlet pipeline (61) is in communication with the condenser (12), the second liquid inlet pipeline (62) is in communication with the air cooler (2), and the total liquid inlet pipeline (3) is in communication with the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62), respectively, so as to connect the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62) in parallel; a first liquid discharge pipeline (63) and a second liquid discharge pipeline (64), wherein the first liquid discharge pipeline (63) is connected in series with the condenser (12) and the first liquid inlet pipeline (61), and the second liquid discharge pipeline (64) is connected in series with the air cooler (2) and the second liquid inlet pipeline (62), and the total liquid discharge pipeline (4) is respectively connected with the first liquid discharge pipeline (63) and the second liquid discharge pipeline (64), so as to connect the first liquid discharge pipeline (63) and the second liquid discharge pipeline (64) in parallel; A flow regulating element (8) is arranged at the intersection of the main liquid inlet pipeline (3), the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62) and is used to regulate the flow of coolant entering the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62).

6. The heat exchange system according to claim 5, characterized in that: The heat exchange system further comprises: A temperature sensor, which is used to detect the ambient temperature; A second controller is respectively connected to the temperature sensor and the flow regulating element (8) for communication, and the second controller controls the working state of the flow regulating element (8) according to the detection value of the temperature sensor.

7. A control method for a heat exchange system of a hydro-generator set, characterized in that: The heat exchange system comprises: an evaporative cooling device (1), which is used to cool the stator winding of the hydro-generator set, and the evaporative cooling device (1) comprises a condenser (12); An air cooler (2) arranged outside the stator winding of the hydro-generator set; A bridge pipe, comprising a series pipe (5) connected between the condenser (12) and the air cooler (2), wherein the series pipe (5) connects the condenser (12) and the air cooler (2) in series; a total liquid inlet pipeline (3) and a total liquid discharge pipeline (4), wherein the total liquid inlet pipeline (3) is in communication with the condenser (12), and the total liquid discharge pipeline (4) is in communication with the air cooler (2); wherein a reversing valve (7) is provided on the total liquid inlet pipeline (3) or the total liquid discharge pipeline (4); The control method comprises: Get the ambient temperature; The working state of the reversing valve (7) is controlled according to the ambient temperature to adjust the flow direction of the cooling liquid.

8. The control method according to claim 7, characterized in that: The step of "controlling the working state of the reversing valve (7) according to the ambient temperature to adjust the flow direction of the coolant" comprises: When the ambient temperature is less than a first preset value, the working state of the reversing valve (7) is controlled so that the coolant first enters the condenser (12) and then enters the air cooler (2); and / or When the ambient temperature is greater than or equal to a first preset value, the working state of the reversing valve (7) is controlled so that the coolant first enters the air cooler (2) and then enters the condenser (12).

9. A method for controlling a heat exchange system of a hydro-generator set, characterized in that: The heat exchange system comprises: an evaporative cooling device (1), which is used to cool the stator winding of the hydro-generator set, and the evaporative cooling device (1) comprises a condenser (12); An air cooler (2) arranged outside the stator winding of the hydro-generator set; A bridge pipeline, comprising a first liquid inlet pipeline (61), a second liquid inlet pipeline (62), a first liquid discharge pipeline (63) and a second liquid discharge pipeline (64), wherein the first liquid inlet pipeline (61) is connected to the condenser (12), the second liquid inlet pipeline (62) is connected to the air cooler (2), the first liquid discharge pipeline (63) is connected in series with the condenser (12) and the first liquid inlet pipeline (61), and the second liquid discharge pipeline (64) is connected in series with the air cooler (2) and the second liquid inlet pipeline (62); a main liquid inlet pipeline (3), which is in communication with the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62) respectively, so as to connect the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62) in parallel; a main liquid discharge pipeline (4), which is in communication with the first liquid discharge pipeline (63) and the second liquid discharge pipeline (64) respectively, so as to connect the first liquid discharge pipeline (63) and the second liquid discharge pipeline (64) in parallel; a flow regulating element (8) which is arranged at the intersection of the main liquid inlet pipeline (3), the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62) and is used to regulate the flow of coolant entering the first liquid inlet pipeline (61) and the second liquid inlet pipeline (62); The control method comprises: Get the ambient temperature; The working state of the flow regulating element (8) is controlled according to the ambient temperature to respectively regulate the flow of the coolant entering the condenser (12) and the air cooler (2).

10. The control method according to claim 9, characterized in that: The step of "controlling the working state of the flow regulating element (8) according to the ambient temperature to respectively regulate the flow of the coolant entering the condenser (12) and the air cooler (2)" comprises: When the ambient temperature is less than a second preset value, the working state of the flow regulating element (8) is controlled so that the flow rate of the coolant entering the condenser (12) is greater than the flow rate of the coolant entering the air cooler (2); and / or When the ambient temperature is greater than or equal to a second preset value, the working state of the flow regulating element (8) is controlled so that the flow rate of the coolant entering the condenser (12) is less than the flow rate of the coolant entering the air cooler (2).

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