A natural ventilation direct air cooling system

Abstract

This invention provides a natural ventilation direct air-cooling system, including an air-cooling tower, a plurality of first air-cooled condensers continuously arranged on the outer circumference of the air-cooling tower inlet, a plurality of second air-cooled condensers arranged horizontally at the same height within the air-cooling tower, a plurality of steam isolation valves for isolating or connecting the steam of the first and second air-cooled condensers, a steam distribution pipe located at the top of the first air-cooled condensers, and a condensate device; the inlet pipes of the first and second air-cooled condensers are respectively connected to the outlet end of the steam distribution pipe, and the outlet pipes of the first and second air-cooled condensers are respectively connected to the inlet end of the condensate device; the plane where the bottom of the second air-cooled condenser is located is above the plane where the top of the first air-cooled condenser is located. This invention can reduce the antifreeze pressure of the natural ventilation direct air-cooling system in winter.

Description

Technical Field

[0001] This utility model relates to the field of natural ventilation direct air cooling technology, and in particular to a natural ventilation direct air cooling system. Background Technology

[0002] Natural draft condenser (NDC) systems refer to systems where turbine exhaust steam is delivered to air-cooled radiators via exhaust pipes. These radiators are housed within a natural draft condenser tower, where the tower's draft forces air through them, causing the steam to condense. This system performs single-pass heat exchange, resulting in high cooling efficiency. It eliminates the need for mechanical ventilation fan groups and circulating water pumps, reducing electricity consumption and eliminating noise. It represents a significant technological breakthrough in air-cooling technology for large coal-fired power units. However, existing natural draft condenser systems suffer from low condensate subcooling in winter, sometimes even leading to radiator tube bundle freezing and cracking. Natural draft condenser systems face significant challenges in winter freeze protection.

[0003] Therefore, it is necessary to develop a new natural ventilation direct air cooling system to reduce the antifreeze pressure of natural ventilation direct air cooling systems in winter. Utility Model Content

[0004] The purpose of this invention is to provide a natural ventilation direct air cooling system to solve the problem of high antifreeze pressure in existing natural ventilation direct air cooling systems during winter.

[0005] To solve the above-mentioned technical problems, this utility model provides a natural ventilation direct air-cooling system, including an air-cooling tower, a plurality of first air-cooling condensers continuously arranged on the outer circumferential surface of the air-cooling tower at the air inlet, a plurality of second air-cooling condensers arranged horizontally at the same height and intervals inside the air-cooling tower, a plurality of steam isolation valves for isolating or connecting the steam of the first air-cooling condensers and the steam of the second air-cooling condensers, a steam distribution pipe arranged at the top of the first air-cooling condensers, and a condensate device; the inlet pipes of the first air-cooling condensers and the inlet pipes of the second air-cooling condensers are respectively connected to the outlet end of the steam distribution pipe, the outlet pipes of the first air-cooling condensers and the outlet pipes of the second air-cooling condensers are respectively connected to the inlet end of the condensate device, and the plane where the bottom of the second air-cooling condenser is located is above the plane where the top of the first air-cooling condenser is located.

[0006] Optionally, the first air-cooled condenser includes a vertical cooling pipe, a vertically arranged first vertical heat dissipation plate, and a second vertical heat dissipation plate whose vertical side is connected to the vertical side of the first vertical heat dissipation plate. The vertical cooling pipe is disposed on the first vertical heat dissipation plate and the second vertical heat dissipation plate. The first vertical heat dissipation plate and the second vertical heat dissipation plate have openings for air circulation. The included angle formed by the first vertical heat dissipation plate and the second vertical heat dissipation plate faces the outside of the air-cooled tower. One end of the vertical cooling pipe is connected to the steam distribution pipe, and the other end is connected to the condensate device.

[0007] Optionally, the first vertical heat sink and the second vertical heat sink have aluminum fins.

[0008] Optionally, the first air condenser further includes a first adjustable louver, one vertical side of which is connected to the vertical side of the first vertical heat sink, and the other vertical side of which is connected to the vertical side of the second vertical heat sink, so that the first air condenser forms a triangular prism structure.

[0009] Optionally, the second air-cooled condenser includes a horizontal cooling pipe, a first horizontal heat dissipation plate at an angle to the horizontal surface, and a second horizontal heat dissipation plate at an angle to the horizontal surface with its horizontal side connected to the horizontal side of the first horizontal heat dissipation plate. The horizontal cooling pipe is disposed on the first horizontal heat dissipation plate and the second horizontal heat dissipation plate. The first horizontal heat dissipation plate and the second horizontal heat dissipation plate have openings for air circulation. The angle formed by the first horizontal heat dissipation plate and the second horizontal heat dissipation plate faces the bottom of the air-cooled tower. One end of the horizontal cooling pipe is connected to the steam distribution pipe, and the other end is connected to the condensate device.

[0010] Optionally, the first horizontal heat sink and the second horizontal heat sink have aluminum fins.

[0011] Optionally, the second air condenser further includes a second adjustable louver, one horizontal side of which is connected to the horizontal side of the first horizontal heat sink, and the other horizontal side of which is connected to the horizontal side of the second horizontal heat sink.

[0012] Optionally, it also includes a support platform located at the bottom of the outer side of the air-cooled tower, with the first air-cooled condenser disposed on the support platform.

[0013] Optionally, the air-cooled tower includes a lower X-column and an upper tower tube supported by the lower X-column, the first air-cooled condenser is disposed on the outer surface of the lower X-column, and the second air-cooled condenser is disposed inside the upper tower tube.

[0014] Optionally, the steam isolation valve is an electric steam isolation valve.

[0015] The natural ventilation direct air-cooling system provided by this utility model has the following beneficial effects:

[0016] Because a first air-cooled condenser and a second air-cooled condenser are installed, and both are connected to the outlet end of the steam distribution pipe (i.e., in parallel), and the bottom plane of the second air-cooled condenser is above the top plane of the first air-cooled condenser, multiple first air-cooled condensers are continuously arranged on the outer circumference of the air-cooled tower inlet, and multiple second air-cooled condensers are arranged horizontally at the same height inside the air-cooled tower. Therefore, cold air first flows through the first air-cooled condenser and then through the second air-cooled condenser, before exiting from the top of the air-cooled tower. Thus, the steam isolation valve can be selectively opened to allow steam to enter the first air-cooled condenser and / or the second air-cooled condenser. Because the second air-cooled condenser is inside the tower, and air flows through the first air-cooled condenser before flowing through the second air-cooled condenser, the condensation effect of steam supplied to the second air-cooled condenser alone differs significantly from that supplied to the first air-cooled condenser alone. This results in three different condensation effects. Depending on the ambient temperature, the steam isolation valve can be selectively opened to meet different condensation requirements. Especially in cold winters, steam can be introduced only into the second air-cooled condenser, preventing freezing damage to the pipes of both the first and second air-cooled condensers. Furthermore, since the first air-cooled condenser is located on the outer circumference of the air-cooled tower's inlet, it can block ambient airflow, minimizing the impact of wind on the second air-cooled condenser inside the tower. This allows the second air-cooled condenser to operate normally even in windy conditions, improving the condensation effect of the natural ventilation direct air-cooling system and providing good wind resistance. Moreover, the cold air flows first through the first air-cooled condenser and then through the second air-cooled condenser before exiting from the top of the air-cooled tower, forming a three-dimensional heat dissipation structure. This fully utilizes the space inside and outside the air-cooled tower and the natural convection effect, improving heat dissipation efficiency. The fact that both the first and second air-cooled condensers are horizontal inside the tower and vertical outside can reduce the size of the direct air-cooling system cooling tower, saving on civil engineering costs, reducing land occupation, and making the overall layout of the power plant more flexible. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the natural ventilation direct air-cooling system in one direction according to an embodiment of this utility model;

[0018] Figure 2 This is a cross-sectional view of the natural ventilation direct air-cooling system in an embodiment of this utility model from another direction;

[0019] Figure 3 This is a cross-sectional view of the natural ventilation direct air-cooling system in an embodiment of this utility model from another direction; Explanation of reference numerals:

[0020] Figure 4 This is a front view of the first air condenser of the natural ventilation direct air-cooled system in this embodiment of the utility model;

[0021] Figure 5 This is a top view of the first air condenser of the natural ventilation direct air-cooled system in this embodiment of the present invention;

[0022] Figure 6 This is a front view of the second air condenser of the natural ventilation direct air-cooled system in this embodiment of the present invention;

[0023] Figure 7 This is a top view of the second air condenser of the natural ventilation direct air cooling system in an embodiment of this utility model.

[0024] 100-Air-cooled tower; 200-First air-cooled condenser; 210-First adjustable louver; 300-Second air-cooled condenser; 400-Steam isolation valve; 500-Steam distribution pipe; 600-Condensate device; 700-Support platform; 800-Main steam pipe. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 1 This is a cross-sectional view of the natural ventilation direct air-cooling system in one direction according to an embodiment of this utility model. Figure 2 This is a cross-sectional view of the natural ventilation direct air-cooling system in an embodiment of this utility model from another direction. Figure 3 This is a cross-sectional view of the natural ventilation direct air-cooling system in another direction, according to an embodiment of this utility model. Figure 4 This is a front view of the first air condenser of the natural ventilation direct air-cooled system in this embodiment of the present invention. Figure 5 This is a top view of the first air condenser in the natural ventilation direct air-cooled system according to an embodiment of this utility model. Figure 6 This is a front view of the second air condenser in the natural ventilation direct air-cooled system according to an embodiment of this utility model. Figure 7This is a top view of the second air-cooled condenser in a natural ventilation direct air-cooling system according to an embodiment of the present invention. This embodiment provides a natural ventilation direct air-cooling system, including an air-cooled tower 100, a plurality of first air-cooled condensers 200 continuously arranged on the outer circumferential surface at the air inlet of the air-cooled tower 100, a plurality of second air-cooled condensers 300 arranged horizontally at the same height within the air-cooled tower 100, and a plurality of steam isolation valves 400 for isolating or connecting the steam of the first air-cooled condensers 200 and the second air-cooled condensers 300. The first air-cooled condenser 200 has a steam distribution pipe 500 at its top, and a condensate device 600. The inlet pipes of the first air-cooled condenser 200 and the second air-cooled condenser 300 are respectively connected to the outlet end of the steam distribution pipe 500, and the outlet pipes of the first air-cooled condenser 200 and the second air-cooled condenser 300 are respectively connected to the inlet end of the condensate device 600. The plane at the bottom of the second air-cooled condenser 300 is located above the plane at the top of the first air-cooled condenser 200.

[0032] Because a first air-cooled condenser 200 and a second air-cooled condenser 300 are provided, and the first air-cooled condenser 200 and the second air-cooled condenser 300 are respectively connected to the outlet end of the steam distribution pipe 500, that is, the first air-cooled condenser 200 and the second air-cooled condenser 300 are arranged in parallel, and since the plane where the bottom of the second air-cooled condenser 300 is located is above the plane where the top of the first air-cooled condenser 200 is located, multiple first air-cooled condensers 200 are continuously arranged on the outer peripheral surface of the air inlet of the air-cooled tower 100, and multiple second air-cooled condensers 300 are arranged inside the air-cooled tower 100 and in the same... The air is arranged at high horizontal intervals, so the cold air first flows through the first air condenser 200 and then through the second air condenser 300, before exiting from the top of the air-cooled tower 100. Thus, the steam isolation valve 400 can be selectively opened to allow steam to enter the first air condenser 200 and / or the second air condenser 300. Since the second air condenser 300 is inside the tower, and the air flows through the first air condenser 200 before entering the second air condenser 300, the condensation effect of steam being supplied to the second air condenser 300 alone differs significantly from that of steam being supplied to the first air condenser 200 alone. This design achieves three different condensation effects. The steam isolation valve 400 can be selectively opened according to different ambient temperatures to meet varying condensation needs. Especially in cold winters, steam can be introduced only into the second air condenser 300, thus preventing freezing damage to the pipes of the first and second air condensers 200 and 300. Furthermore, since the first air condenser 200 is located on the outer circumference of the air inlet of the air-cooled tower 100, it can block ambient airflow, resulting in the second air condenser 300, located inside the tower, being less affected by ambient wind. This allows the second air condenser 300 to operate more efficiently even in windy conditions. The condenser 300 can still operate normally, improving the condensation effect of the natural ventilation direct air-cooling system and having good wind resistance. Furthermore, the cold air first flows through the first air-cooled condenser 200 and then through the second air-cooled condenser 300 before flowing out from the top of the air-cooled tower 100, forming a three-dimensional heat dissipation structure. This fully utilizes the internal and external space of the air-cooled tower 100 and the natural convection effect, thereby improving heat dissipation efficiency. The fact that the first air-cooled condenser 200 and the second air-cooled condenser 300 are both horizontal inside the tower and vertical outside the tower can reduce the size of the cooling tower in the direct air-cooling system, save on civil engineering costs, reduce land occupation, and make the overall layout of the thermal power plant more flexible.

[0033] Specifically, the first air-cooled condenser 200 includes a vertical cooling pipe, a vertically arranged first vertical heat dissipation plate, and a second vertical heat dissipation plate whose vertical side is connected to the vertical side of the first vertical heat dissipation plate. The vertical cooling pipe is arranged on the first vertical heat dissipation plate and the second vertical heat dissipation plate. The first vertical heat dissipation plate and the second vertical heat dissipation plate have openings for air circulation. The included angle formed by the first vertical heat dissipation plate and the second vertical heat dissipation plate faces the outside of the air-cooled tower 100. One end of the vertical cooling pipe is connected to the steam distribution pipe 500, and the other end is connected to the condensate device 600.

[0034] The first vertical heat sink and the second vertical heat sink have aluminum fins.

[0035] Specifically, the second air-cooled condenser 300 includes a horizontal cooling pipe, a first horizontal heat dissipation plate forming an angle with the horizontal surface, and a second horizontal heat dissipation plate forming an angle with the horizontal surface and whose horizontal side is connected to the horizontal side of the first horizontal heat dissipation plate. The horizontal cooling pipe is disposed on the first horizontal heat dissipation plate and the second horizontal heat dissipation plate. The first horizontal heat dissipation plate and the second horizontal heat dissipation plate have openings for air circulation. The angle formed by the first horizontal heat dissipation plate and the second horizontal heat dissipation plate faces the bottom of the air-cooled tower 100. One end of the horizontal cooling pipe is connected to the steam distribution pipe 500, and the other end is connected to the condensate device 600.

[0036] The first horizontal heat sink and the second horizontal heat sink have aluminum fins.

[0037] Preferably, the first air-cooled condenser 200 further includes a first adjustable louver 210. One vertical side of the first adjustable louver 210 is connected to the vertical side of the first vertical heat sink, and the other vertical side of the first adjustable louver 210 is connected to the vertical side of the second vertical heat sink, forming a triangular prism structure for the first air-cooled condenser. Air first enters the first air-cooled condenser 200 through the first adjustable louver 210, then flows through the first and second vertical heat sinks, and finally enters the air-cooled tower 100. Thus, the amount of air entering the first air-cooled condenser 200 and the air-cooled tower 100 can be adjusted by regulating the opening of the first adjustable louver 210, thereby adjusting the cooling effect of the natural ventilation direct air-cooling system.

[0038] Preferably, the second air-cooled condenser 300 further includes a second adjustable louver. One horizontal side of the second adjustable louver is connected to the horizontal side of the first horizontal heat dissipation plate, and the other horizontal side of the second adjustable louver is connected to the horizontal side of the second horizontal heat dissipation plate. Thus, the second adjustable louver is located at the bottom of the second air-cooled condenser 300, forming a triangular prism structure. Air first enters the second air-cooled condenser 300 through the second adjustable louver, then flows through the first and second horizontal heat dissipation plates, and finally enters the air-cooled tower 100. Therefore, the amount of air entering the second air-cooled condenser 300 and the air-cooled tower 100 can be adjusted by regulating the opening degree of the second adjustable louver, thereby adjusting the cooling effect of the natural ventilation direct air-cooling system.

[0039] The inlet end of the steam distribution pipe 500 is connected to the outlet end of the main steam pipe 800.

[0040] The natural ventilation direct air cooling system also includes a support platform 700 located at the bottom of the outer side of the air cooling tower 100, and the first air condenser 200 is mounted on the support platform 700.

[0041] The air-cooled tower 100 includes a lower X-column and an upper tower tube supported by the lower X-column. The first air-cooled condenser 200 is disposed on the outer surface of the lower X-column, and the second air-cooled condenser 300 is disposed inside the upper tower tube.

[0042] Preferably, the steam isolation valve 400 is an electric steam isolation valve 400.

[0043] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A natural draft direct air cooling system comprising an air cooling tower, characterized by, It also includes a plurality of first air-cooled condensers continuously arranged on the outer circumferential surface at the air inlet of the air-cooled tower, a plurality of second air-cooled condensers arranged horizontally at the same height within the air-cooled tower, a plurality of steam isolation valves for isolating or connecting the steam of the first air-cooled condensers and the steam of the second air-cooled condensers, a steam distribution pipe arranged at the top of the first air-cooled condensers, and a condensate device; the inlet pipes of the first air-cooled condensers and the inlet pipes of the second air-cooled condensers are respectively connected to the outlet end of the steam distribution pipe, the outlet pipes of the first air-cooled condensers and the outlet pipes of the second air-cooled condensers are respectively connected to the inlet end of the condensate device, and the plane where the bottom of the second air-cooled condenser is located is above the plane where the top of the first air-cooled condenser is located.

2. The natural draft direct air cooling system according to claim 1, wherein The first air-cooled condenser includes a vertical cooling pipe, a vertically arranged first vertical heat dissipation plate, and a second vertical heat dissipation plate whose vertical side is connected to the vertical side of the first vertical heat dissipation plate. The vertical cooling pipe is arranged on the first vertical heat dissipation plate and the second vertical heat dissipation plate. The first vertical heat dissipation plate and the second vertical heat dissipation plate have openings for air circulation. The included angle formed by the first vertical heat dissipation plate and the second vertical heat dissipation plate faces the outside of the air-cooled tower. One end of the vertical cooling pipe is connected to the steam distribution pipe, and the other end is connected to the condensate device.

3. The natural draft direct air cooling system according to claim 2, wherein The first vertical heat sink and the second vertical heat sink have aluminum fins.

4. The natural draft direct air cooling system according to claim 2, wherein The first air condenser also includes a first adjustable louver, one vertical side of which is connected to the vertical side of the first vertical heat sink, and the other vertical side of which is connected to the vertical side of the second vertical heat sink, so that the first air condenser forms a triangular prism structure.

5. The natural draft direct air cooling system according to claim 1, wherein The second air-cooled condenser includes a horizontal cooling pipe, a first horizontal heat dissipation plate forming an angle with the horizontal surface, and a second horizontal heat dissipation plate forming an angle with the horizontal surface and whose horizontal side is connected to the horizontal side of the first horizontal heat dissipation plate. The horizontal cooling pipe is disposed on the first horizontal heat dissipation plate and the second horizontal heat dissipation plate. The first horizontal heat dissipation plate and the second horizontal heat dissipation plate have openings for air circulation. The angle formed by the first horizontal heat dissipation plate and the second horizontal heat dissipation plate faces the bottom of the air-cooled tower. One end of the horizontal cooling pipe is connected to the steam distribution pipe, and the other end is connected to the condensate device.

6. The natural draft direct air cooling system according to claim 5, wherein The first horizontal heat sink and the second horizontal heat sink have aluminum fins.

7. The natural draft direct air cooling system according to claim 5, wherein The second air condenser also includes a second adjustable louver, one horizontal side of which is connected to the horizontal side of the first horizontal heat sink, and the other horizontal side of which is connected to the horizontal side of the second horizontal heat sink.

8. The natural draft direct air cooling system according to claim 1, wherein It also includes a support platform located at the bottom of the outer side of the air-cooled tower, on which the first air-cooled condenser is mounted.

9. The natural draft direct air cooling system according to claim 1, wherein The air cooling tower includes a lower X column and an upper tower cylinder supported by the lower X column, the first air cooling condenser is arranged on the outer surface of the lower X column, and the second air cooling condenser is arranged inside the upper tower cylinder.

10. The natural draft direct air cooling system according to claim 1, wherein The steam isolation valve is an electric steam isolation valve.

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