A cooling device for flexible DC transformer and converter valve

Abstract

The present invention discloses a cooling device for a flexible DC transformer and a converter valve, comprising a tower body, wherein a water retaining plate is provided at the upper part of the tower body to separate the upper part of the tower body into an induced draft space and a heat exchange space; an induced draft structure connected to the outside of the tower body is provided in the induced draft space; a first heat exchange structure connected to the hot water outlet of the flexible DC transformer and a second heat exchange structure connected to the hot water outlet of the converter valve are provided in the heat exchange space, a spray layer is provided in the heat exchange space located above the first heat exchange structure and the second heat exchange structure, and an upper air inlet is provided at the top of the heat exchange space; a heat exchange layer is provided in the heat exchange space located below the first heat exchange structure and the second heat exchange structure, the right side of the heat exchange layer is connected to the outside of the tower body, and the left side of the heat exchange layer is connected to the induced draft space. The cooling device for a flexible DC transformer and a converter valve of the present invention has low noise and occupies little space.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling of a converter station of a direct current transmission project, and in particular to a cooling device for a flexible direct current transformer and a converter valve. Background Art

[0002] The flexible DC transformers and converter valves in the converter stations of DC transmission projects emit a large amount of heat during operation. In the existing technology, flexible DC transformers generally adopt forced oil-air cooling, and a small number of projects adopt forced oil-water cooling. The heat dissipation efficiency of forced oil-air cooling is low and the fan noise is large. It is mainly used for outdoor heat dissipation of flexible DC transformers, not suitable for indoor use, and cannot meet the noise control requirements of environmental protection; the converter valve adopts forced water cooling or forced water-air cooling according to environmental conditions. When the flexible DC transformer adopts forced oil-water cooling and the converter valve also adopts forced water cooling, the existing technical solution is that the flexible DC transformer and the converter valve independently set up their own cooling systems, and each independent system is independently configured with a water cooling tower. Each water cooling tower needs to be independently configured with major heat dissipation components: heat exchange coils, spray pipes and water nozzles, heat exchange layers, water baffles, return water ports, fans and motors and wall panels. In this way, the heat dissipation components of each water cooling tower need to occupy a tower body respectively, and installation and operation and maintenance space need to be considered between the heat dissipation components of each water cooling tower and the tower body wall panels, and between the cooling towers of the two systems. The space utilization rate is low and the overall space occupied is large. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a cooling device for a flexible DC transformer and a converter valve, which can solve the technical problems in the prior art that the cooling tower of the flexible DC transformer is noisy and the two cooling towers occupy a large space when both the flexible DC transformer and the converter valve adopt water cooling for heat dissipation.

[0004] To achieve the above-mentioned object, the present invention provides a cooling device for a flexible DC transformer and a converter valve, comprising a tower body, wherein the upper portion of the tower body is provided with a water baffle to separate the upper portion of the tower body into an induced draft space and a heat exchange space on the left and right sides;

[0005] The air-inducing space is provided with an air-inducing structure connected to the outside of the tower body;

[0006] The heat exchange space is provided with a first heat exchange structure connected to the hot water outlet of the flexible DC transformer and a second heat exchange structure connected to the hot water outlet of the converter valve. A spray layer is provided in the heat exchange space above the first heat exchange structure and the second heat exchange structure. An upper air inlet is provided at the top of the heat exchange space.

[0007] A heat exchange layer is provided in the heat exchange space below the first heat exchange structure and the second heat exchange structure. The right side of the heat exchange layer is connected to the outside of the tower body, and the left side of the heat exchange layer is connected to the induced draft space.

[0008] As a preferred solution, the heat exchange layer includes a heat exchange bracket and a plurality of heat exchange plates arranged vertically and in rows on the heat exchange bracket. A lower air inlet is provided on the right side of the lower part of the tower body, and each heat exchange plate is provided with a through hole for connecting the air induced space and the lower air inlet.

[0009] The bottom of the water baffle is connected to the left end of the heat exchange bracket.

[0010] As a preferred solution, the heat exchange plate is a corrugated plate.

[0011] As a preferred solution, the through holes on each of the heat exchange plates are staggered in left-right direction.

[0012] As a preferred solution, the upper right end of the heat exchange bracket is provided with a wind shield connected to the tower body above the lower air inlet.

[0013] As a preferred solution, the air-inducing structure includes a plurality of fans arranged in a row, and each of the fans is connected to a motor.

[0014] As a preferred embodiment, the first heat exchange structure includes a first heat exchange coil and a first water inlet and a first water outlet provided on the first heat exchange coil, wherein the first water inlet is connected to the hot water outlet of the flexible DC transformer, and the first water outlet is connected to the cold water inlet of the flexible DC transformer;

[0015] The second heat exchange structure includes a second heat exchange coil and a second water inlet and a second water outlet arranged on the second heat exchange coil. The second water inlet is connected to the hot water outlet of the converter valve, and the first water outlet is connected to the cold water inlet of the converter valve.

[0016] As a preferred solution, the spray layer includes a plurality of spray pipes arranged on the upper part of the first heat exchange coil and the second heat exchange coil, the spray pipes are provided with a plurality of nozzles with lower air inlets facing downwards, and the spray pipes are all connected to the spray pool.

[0017] As a preferred solution, a water return port is provided on the tower body at the bottom of the heat exchange layer, and the water return port is connected to the spray pool.

[0018] As a preferred solution, an air outlet is provided at the top of the air-inducing space, and the air-inducing structure is connected to the air outlet.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The cooling device for a flexible DC transformer and a converter valve of the present invention comprises a tower body, wherein a water baffle is provided on the upper part of the tower body to separate the upper part of the tower body into an induced draft space and a heat exchange space on the left and right sides; an induced draft structure connected to the outside of the tower body is provided in the induced draft space, and the induced draft structure can form a strong airflow to discharge the water vapor in the induced draft space to the outside air; a first heat exchange structure connected to the hot water outlet of the flexible DC transformer and a second heat exchange structure connected to the hot water outlet of the converter valve are provided in the heat exchange space, and a spray layer is provided in the heat exchange space above the first heat exchange structure and the second heat exchange structure, and the hot water discharged from the flexible DC transformer flows to the first heat exchange structure, and the hot water discharged from the converter valve flows to the first heat exchange structure. The hot water flows to the second heat exchange structure, and the cooling water sprayed onto the first heat exchange structure and the second heat exchange structure by the spray layer is exchanged with the hot water to achieve cooling; an upper air inlet is provided on the top of the heat exchange space; a heat exchange layer is provided in the heat exchange space located below the first heat exchange structure and the second heat exchange structure, the right side of the heat exchange layer is connected to the outside of the tower body, and the left side of the heat exchange layer is connected to the induced draft space, and the hot water falling from the first heat exchange structure and the second heat exchange structure falls onto the heat exchange layer, and the induced draft structure can attract the cold air outside the tower body and pass through the heat exchange layer to exchange heat with the hot water, and attract the hot air and uncondensed water vapor that absorb the heat of the spray water to be discharged into the air outside the tower body.

[0021] The cooling device for the flexible DC transformer and the converter valve of the present application utilizes a cooling tower to achieve heat dissipation, reduces noise of the flexible DC transformer, and meets environmental protection requirements. The heat exchange between the flexible DC transformer and the converter valve is carried out in the same tower body, and the spray layer, heat exchange layer, water baffle, fan and motor can be shared, saving the technical problem of space occupation caused by using two cooling towers. The device is easy to install and maintain, and has a high space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 1. It is a schematic top view of the cooling device for a flexible DC transformer and a converter valve according to the present invention;

[0023] Figure 2 yes Figure 1 AA cross-sectional structural diagram;

[0024] Figure 3 yes Figure 1 Schematic diagram of the BB cross-section structure.

[0025] In the figure, 1. first heat exchange structure; 1a. first water inlet; 1b. first water outlet; 2. second heat exchange structure; 2a. second water inlet; 2b. second water outlet; 3. first spray pipe; 4. second spray pipe; 5. heat exchange layer; 6. water baffle; 7. upper air inlet; 8. lower air inlet; 9. fan; 10. air outlet; 12. return water outlet; 13. wall panel. DETAILED DESCRIPTION

[0026] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0028] For details, please refer to the preferred embodiment of the cooling device for flexible DC transformer and converter valve of the present invention. Figures 1 to 3 As shown, it includes a tower body, the upper part of the tower body is provided with a water retaining plate 6 to separate the upper part of the tower body into an induced draft space and a heat exchange space on the left and right sides; the induced draft space is provided with an induced draft structure connected to the outside of the tower body, and the induced draft structure can form a strong airflow to discharge the water vapor in the induced draft space to the outside air; the heat exchange space is provided with a first heat exchange structure 1 connected to the hot water outlet of the flexible DC transformer and a second heat exchange structure 2 connected to the hot water outlet of the converter valve, and a spray layer is provided in the heat exchange space above the first heat exchange structure 1 and the second heat exchange structure 2, and the hot water discharged from the flexible DC transformer flows to the first heat exchange structure 1, and the hot water discharged from the converter valve flows to the second heat exchange structure 2, and the hot water discharged by the converter valve flows to the second heat exchange structure 2. The cooling water sprayed onto the first heat exchange structure 1 and the second heat exchange structure 2 is heat exchanged with hot water to achieve cooling; an upper air inlet 7 is provided on the top of the heat exchange space; a heat exchange layer 5 is provided in the heat exchange space located below the first heat exchange structure 1 and the second heat exchange structure 2, the right side of the heat exchange layer 5 is connected to the outside of the tower body, and the left side of the heat exchange layer 5 is connected to the induced draft space, and the hot water falling from the first heat exchange structure 1 and the second heat exchange structure 2 falls onto the heat exchange layer 5, and the induced draft structure can attract the cold air outside the tower body to the heat exchange layer 5, exchange heat with the hot water falling onto the heat exchange layer 5, and attract the hot air and uncondensed water vapor that absorb the heat of the spray water to be discharged into the air outside the tower body.

[0029] Among them, such as Figure 3As shown, the heat exchange layer 5 specifically includes a heat exchange bracket and a plurality of heat exchange plates arranged vertically and in rows on the heat exchange bracket. A lower air inlet 8 is provided on the right side of the lower part of the tower body, and each heat exchange plate is provided with a through hole for connecting the induced air space and the lower air inlet 8. The cooling air outside the tower body is attracted from the lower air inlet to the heat exchange plate by utilizing the attraction generated by the induced air structure of the induced air space, and passes through the plurality of heat exchange plates in sequence through the through holes. In this process, the cooling air exchanges heat with the hot water falling onto the heat exchange layer 5. After the heat exchange, the hot water is cooled to form cooling water which flows to the bottom of the tower body. At the same time, the hot air and uncondensed water vapor that absorb the heat of the spray water are further attracted to the induced air space through the induced air structure to be discharged into the air outside the tower body.

[0030] The water baffle 6 in this application is mainly used to prevent the spray water from escaping to the outside along with the strong airflow, reducing the loss of spray water. The bottom of the water baffle 6 is connected to the left end of the heat exchange bracket to fix the water baffle 6 while preventing the spray water from directly entering the induced draft space under the suction of the induced draft structure.

[0031] Furthermore, the heat exchange plate is specifically a corrugated plate, and multiple rows of corrugated plates can divert the spray water after heat exchange. At the same time, the corrugated plates can increase the contact area between the cooling air and the spray water after heat exchange and at the same time increase the contact time, thereby improving the cooling efficiency.

[0032] Furthermore, in an embodiment of the present application, the through holes on each heat exchange plate may be staggered in the left-right direction to further increase the cooling air movement path and increase the cooling time.

[0033] In a further embodiment of the present application, a wind shield is provided at the upper right end of the heat exchange bracket, which is connected to the tower body above the lower air inlet. The wind shield can prevent the cooling air at the lower air inlet 8 from entering the upper part of the heat exchange layer 5, so that the spray water after heat exchange is not easy to fall.

[0034] In the embodiment of the present application, the induced air structure is a plurality of fans 9 arranged in a row, each fan 9 is connected to a motor, and an air outlet 10 is provided at the top of the induced air space 14 , and the air outlet 10 is connected to the fan 9 .

[0035] The first heat exchange structure 1 includes a first heat exchange coil and a first water inlet 1a and a first water outlet 1b provided at the end of the first heat exchange coil. The first water inlet 1a is connected to the hot water outlet of the flexible DC transformer, and the first water outlet 1b is connected to the cold water inlet of the flexible DC transformer, so that the cooled water can be passed into the flexible DC transformer for recycling. The second heat exchange structure 2 includes a second heat exchange coil and a second water inlet 2a and a second water outlet 2b provided at the end of the second heat exchange coil. The second water inlet 2a is connected to the hot water outlet of the converter valve, and the second water outlet 2b is connected to the cold water inlet of the converter valve, so that the cooled water can be passed into the converter valve for recycling. In the embodiment of the present application, the first heat exchange coil and the second heat exchange coil are each a pipe extending in a U-shaped curve.

[0036] Furthermore, the spray layer includes a plurality of spray pipes arranged on the upper part of the first heat exchange coil and the second heat exchange coil, and a plurality of nozzles with lower air inlets facing downward are provided on the spray pipes. The spray pipes are all connected to the spray pool. The water sprayed from the nozzles covers the surface of the first heat exchange coil and the second heat exchange coil and performs heat exchange with the hot water in the first heat exchange coil and the second heat exchange coil to achieve heat exchange.

[0037] In a further embodiment of the present application, the spray pipe can be set as a first spray pipe 3 located on the upper part of the first heat exchange coil and a second spray pipe 4 located on the upper part of the second heat exchange coil, and nozzles are provided on both the first spray pipe 3 and the second spray pipe 4.

[0038] Furthermore, a water return port 12 is provided on the tower body at the bottom of the heat exchange layer 5, and is connected to the spray pool. Water sprayed from the spray pipe exchanges heat with the first and second heat exchange coils through the water return port 12, then falls onto the heat exchange layer 5 for heat exchange and cooling. After cooling, it becomes cooling water and flows through the water return port 12 to the spray pool, thus achieving cooling water recycling.

[0039] Working principle:

[0040] The hot water of the closed circulating water that absorbs the heat of the flexible direct current transformer and the converter valve enters the heat exchange coil from the first water inlet 1a of the first heat exchange coil and the second water inlet 2a of the second heat exchange coil respectively. The spray pipe and the nozzle continuously spray open spray water to the first heat exchange coil and the second heat exchange coil. The heat of the closed circulating water in the first heat exchange coil and the second heat exchange coil is absorbed by the spray water and the temperature is reduced. The closed circulating water flows out of the first water outlet 1b of the first heat exchange coil and the second water outlet 2b of the second heat exchange coil, and the cold water flows back to the flexible direct current transformer and the converter valve to absorb the heat and then becomes hot water and repeatedly enters the first water inlet 1a of the first heat exchange coil and the second water inlet 2a of the second heat exchange coil; the temperature of the spray water that absorbs the heat in the first heat exchange coil and the second heat exchange coil increases, and Part of the spray water vaporizes, and the steam-water mixture falls to the heat exchange layer below; under the action of the fan 9, the upper air inlet 7 and the lower air inlet 8 continue to absorb fresh air, and the outdoor air flow at normal temperature exchanges heat with the spray water in the heat exchange layer 5 area. After part of the heat of the spray water is transferred to the outdoor air flow at normal temperature, the temperature drops and part of the water vapor condenses into liquid water. The bottom plate of the wall panel 13 on the lower right side of the cooling tower collects the fallen spray water and returns it to the lower spray pool for reuse through the return water port 12 below; the hot air that absorbs the heat of the spray water, along with the uncondensed water vapor, finally enters the outside air through the air outlet 10 under the action of the strong airflow formed by the fan 9; the water baffle 6 prevents the spray water from drifting to the outdoors along with the strong airflow, thereby reducing the loss of spray water.

[0041] Compared to existing technologies, the cooling device of this application occupies less space overall, reduces noise, and facilitates single-tower noise control. The cooling tower, acting as a noise source, can be more flexibly positioned, further facilitating the overall noise control requirements of the converter station. Furthermore, unlike the currently rare, oil-water-cooled solutions used by flexible DC transformers, which require independent cooling towers for the flexible DC transformer and converter valve, this solution leverages the synchronous operation of the flexible DC transformer and converter valve. While maintaining independent closed-loop water circulation piping for the flexible DC transformer and converter valve, the two systems share other components and the tower, significantly reducing the overall component layout space and the overall cooling system layout space.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A cooling device for a flexible DC transformer and a converter valve, characterized in that: It comprises a tower body, wherein the upper part of the tower body is provided with a water retaining plate to separate the upper part of the tower body into an air induction space and a heat exchange space on the left and right sides; The air induction space is provided with an air induction structure connected to the outside of the tower body; The heat exchange space is provided with a first heat exchange structure connected to the hot water outlet of the flexible DC transformer and a second heat exchange structure connected to the hot water outlet of the converter valve, a spray layer is provided in the heat exchange space located above the first heat exchange structure and the second heat exchange structure, and an upper air inlet is provided at the top of the heat exchange space; A heat exchange layer is provided in the heat exchange space located below the first heat exchange structure and the second heat exchange structure, the right side of the heat exchange layer is connected to the outside of the tower body, and the left side of the heat exchange layer is connected to the induced air space; A water return port is provided on the tower body at the bottom of the heat exchange layer, and the water return port is connected to the spray pool. The water sprayed from the spray pipe exchanges heat with the first heat exchange coil and the second heat exchange coil, and then falls onto the heat exchange layer for heat exchange and cooling. After cooling, cooling water is formed and flows to the spray pool through the water return port. The heat exchange layer includes a heat exchange bracket and a plurality of heat exchange plates arranged vertically and in rows on the heat exchange bracket. A lower air inlet is provided on the right side of the lower part of the tower body, and each heat exchange plate is provided with a through hole for connecting the air inlet space and the lower air inlet. The bottom of the water retaining plate is connected to the left end of the heat exchange bracket; The heat exchange plate is a corrugated plate; The through holes on each of the heat exchange plates are staggered in left-right direction; The cooling air outside the tower body is drawn from the lower air inlet to the heat exchange plate by utilizing the attraction generated by the induced draft structure of the induced draft space, and passes through multiple heat exchange plates in sequence through the through holes. In this process, the cooling air exchanges heat with the hot water that falls on the heat exchange layer. After the heat exchange, the hot water is cooled to form cooling water that flows to the bottom of the tower body. At the same time, the hot air and uncondensed water vapor that absorb the heat of the spray water are further drawn into the induced draft space through the induced draft structure to be discharged into the air outside the tower body.

2. The cooling device for flexible DC transformer and converter valve according to claim 1, characterized in that: The upper right end of the heat exchange bracket is provided with a wind shield plate connected to the tower body above the lower air inlet.

3. The cooling device for flexible DC transformer and converter valve according to claim 1, characterized in that: The air induction structure comprises a plurality of fans arranged in a row, and each of the fans is connected to a motor.

4. The cooling device for flexible DC transformer and converter valve according to claim 1, characterized in that: The first heat exchange structure includes a first heat exchange coil and a first water inlet and a first water outlet arranged on the first heat exchange coil, the first water inlet is connected to the hot water outlet of the flexible DC transformer, and the first water outlet is connected to the cold water inlet of the flexible DC transformer; The second heat exchange structure includes a second heat exchange coil and a second water inlet and a second water outlet arranged on the second heat exchange coil, the second water inlet is connected to the hot water outlet of the converter valve, and the first water outlet is connected to the cold water inlet of the converter valve.

5. The cooling device for flexible DC transformer and converter valve according to claim 4, characterized in that: The spray layer includes a plurality of spray pipes arranged on the upper part of the first heat exchange coil and the second heat exchange coil, the spray pipes are provided with a plurality of nozzles with lower air inlets facing downwards, and the spray pipes are all connected to a spray pool.

6. The cooling device for flexible DC transformer and converter valve according to claim 1, characterized in that: An air outlet is arranged at the top of the air induction space, and the air induction structure is connected to the air outlet.

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