A waterless cooling system for high voltage direct current transmission converter valve

Abstract

A waterless cooling system for a high-voltage direct current transmission converter valve includes a direct current transmission converter valve heating element that generates heat and a waterless working medium that absorbs heat, and is characterized in that: the system also includes: a heat-absorbing cooling device, a condensing heat dissipation device and a throttling device; the condensing heat dissipation device is connected to the direct current transmission converter valve heating element, including: a first condensing heat dissipation device and a second condensing heat dissipation device, which are respectively used for forced heat dissipation and natural heat dissipation of the waterless working medium; the throttling device is connected to the condensing heat dissipation device to change the physical state of the waterless working medium and accelerate evaporation; the heat-absorbing cooling device is connected to the throttling device and connected to the direct current transmission converter valve heating element to form a closed loop, which is used to accelerate the heat dissipation of the direct current transmission converter valve heating element and accelerate the evaporation of the waterless working medium at the throttling device. The present disclosure adopts a waterless working medium to solve the problem of water freezing due to low temperature and freezing related equipment.

Description

Technical Field

[0001] The present invention belongs to the field of high-voltage direct current transmission converter valve cooling, and more specifically, relates to a waterless cooling system for a high-voltage direct current transmission converter valve. Background Art

[0002] At present, the cooling of HVDC converter valves is greatly affected by the environment. The heat dissipation device uses water as the working fluid, and the discharge and treatment of wastewater are difficult. In winter, freezing must be prevented, and the anti-freezing measures are complex and unreliable. The entire system adopts forced heat dissipation and is driven by a motor fan, which occupies a large area and generates a lot of noise. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the purpose of the present invention is to address the shortcomings of the above-mentioned prior art. The solution of the present invention adopts a water-free working fluid to solve the problem of water freezing due to low temperature and damaging related equipment, and further proposes a water-free cooling system for high-voltage direct current transmission converter valves.

[0004] The present invention adopts the following technical solution.

[0005] A waterless cooling system for a high-voltage direct current transmission converter valve comprises a direct current transmission converter valve heating element that generates heat and a waterless working medium that absorbs heat, and is characterized by:

[0006] The system also includes: a heat absorption and cooling device, a condensation and heat dissipation device and a throttling device;

[0007] The condensation heat dissipation device is connected to the heating element of the DC power transmission converter valve, and includes: a first condensation heat dissipation device and a second condensation heat dissipation device, which are respectively used for forced heat dissipation and natural heat dissipation of the anhydrous working medium;

[0008] The throttling device is connected to the condensation and heat dissipation device to change the physical state of the anhydrous working medium and accelerate evaporation;

[0009] The heat absorption and cooling device is connected to the throttling device and connected to the heating element of the DC power transmission converter valve to form a closed loop, which is used to accelerate the heat dissipation of the heating element of the DC power transmission converter valve and accelerate the evaporation of the water-free working medium at the throttling device.

[0010] Furthermore, the condensation and heat dissipation device is connected to a driving module for compressing to change the physical form of the anhydrous working fluid.

[0011] Furthermore, the first condensation and heat dissipation device is connected in parallel with the second condensation and heat dissipation device and is switched and selected by an electric control valve.

[0012] Furthermore, the first condensation and heat dissipation device is connected in series with the second condensation and heat dissipation device.

[0013] Furthermore, the condensing and cooling device is connected to a heat recovery device for recycling the heat energy after the heat is dissipated.

[0014] Furthermore, a heat exchanger is connected between the condensation and heat dissipation device and the heating element of the DC transmission converter valve, and is used to dissipate heat before the anhydrous working fluid is transmitted to the condensation and heat dissipation device.

[0015] Furthermore, the throttling device is a device that changes the pipe diameter from large to small.

[0016] Furthermore, a filtering device and a storage, purification and separation device are connected in sequence between the condensation and heat dissipation device and the throttling device, wherein the filtering device is used to filter impurities in the anhydrous working fluid, and the storage, purification and separation device is used to store excess anhydrous working fluid.

[0017] Furthermore, a secondary heat exchanger is connected between the heat absorption and cooling device and the heating element of the DC power transmission converter valve for cooling the heating element of the DC power transmission converter valve.

[0018] A waterless cooling method for a high-voltage direct current transmission converter valve comprises the following steps:

[0019] Step 1, using an anhydrous working medium to absorb the heat generated by the heating element of the DC transmission converter valve;

[0020] Step 2, using a condensation heat dissipation device to dissipate heat from the anhydrous working fluid;

[0021] Step 3, using a throttling device to change the pressure of the anhydrous working medium to accelerate the evaporation of the anhydrous working medium;

[0022] Step 4, using a heat-absorbing cooling device to accelerate the heat dissipation of the heating elements of the DC transmission converter valve and accelerate the evaporation of the water-free working fluid at the throttling device.

[0023] The beneficial effects of the present invention are that, compared with the prior art, the present invention has the following advantages:

[0024] (1) The present invention adopts a water-free working fluid, which solves the problem of water freezing due to low temperature and damaging related equipment.

[0025] (2) The present disclosure solves the problem of large footprint of water working medium heat dissipation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A waterless cooling system for a high-voltage direct current transmission converter valve is provided in an embodiment of the present disclosure.

[0027] Figure 2 Another waterless cooling system for a high-voltage direct current transmission converter valve is provided in an embodiment of the present disclosure.

[0028] Figure 3 Another water-free cooling system for a high-voltage direct current transmission converter valve is provided in an embodiment of the present disclosure.

[0029] Figure 4 This is another water-free cooling system for a high-voltage direct current transmission converter valve provided by an embodiment of the present disclosure.

[0030] 1. Heating element of DC transmission converter valve; 2. Heat absorption and cooling device; 3. Heat exchanger; 4. Electric control valve; 5. Drive module; 6. First condensation and heat dissipation device (forced heat exchange); 7. Second condensation and heat dissipation device (natural heat exchange); 8. Filter device; 9. Storage, purification and separation device; 10. Throttling device; 11. Drive device (compressor); 12. Secondary heat exchanger. DETAILED DESCRIPTION

[0031] The present application is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present application.

[0032] The present invention adopts a working medium that does not contain water, utilizes the different physical forms of the waterless working medium, and possesses different qualities of energy, and according to the change of physical state, directly or indirectly brings the heat generated by the loss of the converter valve components (thyristor, IGBT, etc.) to the waterless working medium itself. Then, the physical state change of the waterless working medium itself is changed by mechanical work, and then the temperature difference between the ambient temperature and the temperature of the waterless working medium is fully utilized for natural heat dissipation, so that the heat generated by the converter valve components is brought outdoors to dissipate to the atmosphere or recycled. To a great extent, the number of mechanical ventilation fans for heat dissipation of the waterless working medium is reduced, and the energy consumption is reduced; in short, the waterless circulating cooling system solves the problem of water cooling in terms of energy saving, land saving, antifreeze, etc. It should be noted that the waterless working medium can be HFCs (Hydrofluorocarbons, hydrofluorocarbons) or PFCs (perfluoro-carbons, fluorocarbon compounds).

[0033] like Figure 1 As shown, the present invention absorbs the heat generated by the heating element 1 of the DC transmission converter valve through an anhydrous working medium and transfers it to a condensation and heat dissipation device (e.g. Figure 1 Preferably, the anhydrous working medium can be subjected to a first heat dissipation at the heat exchanger 3 before being transferred to the condensation heat dissipation device, such as Figure 2 shown.

[0034] exist Figure 1In the embodiment, the condensation and heat dissipation device may include a first condensation and heat dissipation device 6 or a second condensation and heat dissipation device 7. The first condensation and heat dissipation device can be driven by conventional electricity or solar power. The first condensation and heat dissipation device 6 utilizes solar energy or other natural energy sources to store electricity, and uses the stored electricity to drive the fan, which is started to achieve forced heat dissipation; the second condensation and heat dissipation device 7 achieves natural heat dissipation through the temperature difference between the low natural environment temperature and the system temperature. In some embodiments, the first condensation and heat dissipation device 6 or the second condensation and heat dissipation device 7 can be connected in parallel. When the temperature difference between the working fluid and the ambient temperature difference is very small, the first condensation and heat dissipation device 6 can be used for forced heat exchange; when the temperature difference between the anhydrous working fluid and the ambient temperature difference is very large, the second condensation and heat dissipation device 7 can be used for natural heat exchange. Figure 1 As shown, the first condensation heat dissipation device 6 or the second condensation heat dissipation device 7 can be switched and selected by the electric control valve 4. In some embodiments, as Figure 3 As shown, the first condensation heat dissipation device 6 or the second condensation heat dissipation device 7 can be connected in series. It should be noted that the order in which the first condensation heat dissipation device 6 and the second condensation heat dissipation device 7 are connected in series is not affected by Figure 3 limitation.

[0035] Preferably, in order to make the anhydrous working medium perform better heat exchange in the condensation heat dissipation device, the anhydrous working medium can be compressed by the driving device 11 in the driving module 5 in the branch before being transmitted to the condensation heat dissipation device to change the physical form of the anhydrous working medium. Figure 1 As shown, the driving module 5 is also connected in parallel with an electric control valve 4 for selecting whether the anhydrous working fluid needs to be compressed.

[0036] Preferably, the condensing heat dissipation device can also be connected to a heat recovery device to recycle the heat energy after heat dissipation.

[0037] After heat exchange, the anhydrous working fluid can enter the throttling device 10, which can cause the anhydrous working fluid to undergo a change in physical state, stimulate the latent heat of the anhydrous working fluid, and place the anhydrous working fluid in a low-temperature and low-pressure state. More specifically, the throttling device is a device that suddenly reduces the pipe diameter in the system. The pipe diameter of the liquid in the throttling device circulation system is automatically adjusted according to the temperature of the liquid entering the converter valve. The system will form a local contraction at the throttling point, thereby increasing the flow rate and reducing the static pressure. Thus, a static pressure difference is generated before and after the throttling device. After throttling, due to the pressure reduction, according to the physical properties of the working fluid in the system, the anhydrous working fluid is easy to evaporate. In some embodiments, the throttling device 10 is a device that changes the pipe diameter from large to small.

[0038] Preferably, the anhydrous working fluid can pass through the filtering device 8 and the storage, purification and separation device 9 of the branch (corresponding to the electric control valve 4 in the main circuit) before entering the throttling device 10. Among them, the filtering device 8 is used to filter impurities in the anhydrous working fluid, and the storage, purification and separation device 9 is used to store excess anhydrous working fluid. The significance of storage is that the amount of working fluid in the system is different at different ambient temperatures. In order not to artificially release and charge the working fluid according to the ambient temperature, a device that can be stored in the system is adopted. Purification is mainly to remove water vapor in the system, and filtration is mainly to filter out large particles of matter in the system, such as metal debris that falls off from the system pipeline.

[0039] After throttling, the anhydrous working fluid finally enters the heating element 1 of the DC transmission converter valve.

[0040] Preferably, in order to speed up the heat dissipation of the DC power transmission converter valve heating element 1, a heat absorption cooling device 2 can be provided to cool the DC power transmission converter valve heating element 1. On the other hand, the anhydrous working medium will evaporate after entering the throttling device 10. In order to speed up the evaporation rate, the heat absorption cooling device 2 can also be used to guide the heat of the DC power transmission converter valve heating element 1 to speed up the evaporation rate of the throttling device 10. In some embodiments, the heat absorption cooling device 2 can be a fan, which cools the DC power transmission converter valve heating element 1 by blowing cold air. Preferably, heat exchange can also be performed through a secondary heat exchanger 12 to further cool the DC power transmission converter valve heating element 1, such as Figure 4 shown.

[0041] A waterless cooling method for a high-voltage direct current transmission converter valve, comprising:

[0042] The anhydrous working medium of the present invention absorbs the heat generated by the heating element 1 of the DC power transmission converter valve through heat transfer, performs the first heat dissipation at the heat exchanger 3, and then passes through the driving device 11, switches the electric control valve 4 or changes the working medium flow direction to enter the condensation and heat dissipation device (the first condensation and heat dissipation device (forced heat exchange) 6 and the second condensation and heat dissipation device (natural heat exchange) 7). After passing through the condensation and heat dissipation device, the anhydrous working medium directly passes through the filtering device 8 and the storage, purification and separation device 9, and then passes through the throttling device 10 to change the physical state of the anhydrous working medium, stimulate the latent heat of the anhydrous working medium, and evaporate the working medium. According to the principle of evaporation and heat absorption, the anhydrous working medium is in a low temperature and low pressure state, and then enters the heating element 1 of the DC power transmission converter valve, so that the heat emitted by the converter valve heating element 1 is transferred to the low-temperature system working medium, and then through the circulation of this system, the heat is continuously taken away to achieve the purpose of cooling the converter valve.

[0043] The applicant of the present invention has made a detailed explanation and description of the implementation examples of the present invention in conjunction with the drawings in the specification. However, those skilled in the art should understand that the above implementation examples are only preferred implementation schemes of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, but not to limit the scope of protection of the present invention. On the contrary, any improvements or modifications based on the inventive spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. A waterless cooling system for a high-voltage direct current transmission converter valve, comprising a direct current transmission converter valve heating element (1) for generating heat and a waterless working medium for absorbing heat, Features: The system further comprises: a heat absorption and cooling device (2), a condensation and heat dissipation device and a throttling device (10); The condensation heat dissipation device is connected to the DC power transmission converter valve heating element (1), and comprises: a first condensation heat dissipation device (6) and a second condensation heat dissipation device (7), which are used for forced heat dissipation and natural heat dissipation of the anhydrous working medium respectively; The throttling device (10) is connected to the condensation and heat dissipation device and is used to change the physical state of the anhydrous working medium and accelerate evaporation; The heat absorption and cooling device (2) is connected to the throttling device (10) and is connected to the DC power transmission converter valve heating element (1) to form a closed loop, which is used to accelerate the heat dissipation of the DC power transmission converter valve heating element (1) and accelerate the evaporation of the anhydrous working fluid at the throttling device (10); The throttling device (10) is a device that changes the pipe diameter from large to small; the pipe diameter of the liquid in the throttling device (10) circulation system is automatically adjusted according to the temperature linkage entering the converter valve.

2. A waterless cooling system for a high-voltage direct current transmission converter valve according to claim 1, Features: The condensation and heat dissipation device is connected to a driving module (5) for compressing to change the physical form of the anhydrous working fluid.

3. A waterless cooling system for a high-voltage direct current transmission converter valve according to claim 1, Features: The first condensation and heat dissipation device (6) and the second condensation and heat dissipation device (7) are connected in parallel and are switched and selected via an electric control valve (4).

4. A waterless cooling system for a high-voltage direct current transmission converter valve according to claim 1, Features: The first condensation and heat dissipation device (6) and the second condensation and heat dissipation device (7) are connected in series.

5. A waterless cooling system for a high-voltage direct current transmission converter valve according to claim 1, Features: The condensing and cooling device is connected to a heat recovery device for recycling the heat energy after the heat is dissipated.

6. A waterless cooling system for a high-voltage direct current transmission converter valve according to claim 1, Features: A heat exchanger (3) is connected between the condensation and heat dissipation device and the DC power transmission converter valve heating element (1) and is used to dissipate heat before the anhydrous working medium is transferred to the condensation and heat dissipation device.

7. A waterless cooling system for a high-voltage direct current transmission converter valve according to claim 1, Features: A filtering device (8) and a storage, purification and separation device (9) are connected in sequence between the condensation and heat dissipation device and the throttling device (10), wherein the filtering device (8) is used to filter impurities in the anhydrous working fluid, and the storage, purification and separation device (9) is used to store excess anhydrous working fluid.

8. The waterless cooling system for high-voltage direct current transmission converter valve according to claim 1, Features: A secondary heat exchanger (12) is connected between the heat absorption and cooling device (2) and the DC power transmission converter valve heating element (1) and is used to cool the DC power transmission converter valve heating element (1).

9. A method for cooling a high-voltage direct current transmission converter valve without water, according to a system for cooling a high-voltage direct current transmission converter valve without water according to any one of claims 1 to 8, Features: The steps include: Step 1, using an anhydrous working medium to absorb the heat generated by the heating element (1) of the DC transmission converter valve; Step 2, using a condensation heat dissipation device to dissipate heat from the anhydrous working fluid; Step 3, using the throttling device (10) to change the pressure of the anhydrous working medium to accelerate the evaporation of the anhydrous working medium; Step 4, using the heat absorption cooling device (2) to accelerate the heat dissipation of the heating element (1) of the DC power transmission converter valve and accelerate the evaporation of the water-free working fluid at the throttling device (10).

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