Natural ventilation direct air cooling system

Abstract

The utility model relates to a kind of natural ventilation direct air cooling systems, the air cooling system, including multiple heat exchange modules, multiple heat exchange modules are arranged in circle and are set in cooling tower, each heat exchange module includes at least one downstream cooling triangle and at least one countercurrent cooling triangle;One giant cooling triangle (a big heat exchange module) in existing heat exchange system is optimized to multiple small cooling triangles, air distribution is more uniform, flow field in triangle is more smooth, condenser tube bundle heat exchange efficiency is higher;One giant cooling triangle (a big heat exchange module) in existing heat exchange system is optimized to multiple small cooling triangles, relative size is smaller, and it is convenient for processing, transportation, on-site hoisting;Under the same equivalent area, small cooling triangle occupies area is much smaller than giant cooling triangle, by adjusting the angle of cooling triangle, the diameter of cooling tower can be reduced, and the occupied area can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of air-cooling technology for thermal power plants, specifically to a natural ventilation direct air-cooling system. Background Technology

[0002] The cooling triangle, as the core unit of the air-cooled system, is responsible for cooling the system, and its design and layout determine the performance of the air-cooled system. The cooling triangle consists of two radiators and one air intake louver.

[0003] Currently, large thermal power generating units use giant condensers (cooling triangles) in their natural draft direct air cooling systems. These cooling triangles are vertically arranged outside the tower, with each side of the radiator reaching approximately 10 meters in length and nearly 30 meters in height, making the cooling triangle a unit occupying an area of ​​approximately 40 square meters. 2 Volume 1200m 3 The space—which forms the most basic heat exchange unit of a natural ventilation direct air cooling system.

[0004] However, due to the excessive size of the basic unit, the currently implemented natural ventilation direct air-cooled system has problems such as uneven air and steam distribution on the air and steam sides, excessively large equipment components, and difficulties in processing, transportation, and installation. These problems affect the efficiency, safety, and reliability of the system. Utility Model Content

[0005] To address the above issues, this invention provides a natural ventilation direct air-cooling system. By optimizing the cooling triangle and system design, the air distribution within the heat exchange system becomes more uniform, the flow field within the triangle is smoother, the condenser tube bundle heat exchange efficiency is higher, and the overall heat exchange system occupies less space.

[0006] The technical solution adopted by this utility model is: a natural ventilation direct air-cooling system, characterized in that: it includes multiple heat exchange modules, which are arranged in a circle outside the cooling tower. Each heat exchange module includes at least one co-current cooling triangle and at least one counter-current cooling triangle. Each co-current cooling triangle includes louvers and at least one co-current condenser. The louvers are located on the windward side, serving as one side of the co-current cooling triangle. The condenser tube bundles of the co-current condenser are arranged at a set angle, serving as the other two sides of the co-current cooling triangle. Each counter-current cooling triangle includes louvers and at least one counter-current condenser. The louvers are located on the windward side, serving as one side of the counter-current cooling triangle. The condenser tube bundles of the counter-current condenser are arranged at a set angle, serving as the other two sides of the counter-current cooling triangle. Steam from the main steam pipe enters the co-current condenser of the co-current cooling triangle from top to bottom. As the steam flows, it is continuously cooled into condensate, which flows into the co-current condensate branch pipe at the bottom of the co-current condenser. Steam that is not fully condensed flows into the counter-current condenser of the counter-current cooling triangle. In the counter-current condenser, the steam is condensed into condensate, which flows into the counter-current condensate branch pipe at the bottom of the counter-current condenser. The condensate from the co-current and counter-current condensate branch pipes merges into the condensate pipe. Gas that is still not condensed in the counter-current cooling triangle is extracted through the upper vacuum pipe.

[0007] Preferably, each heat exchange module includes three parallel-connected co-current cooling triangles and one counter-current cooling triangle.

[0008] Preferably, each counter-flow cooling triangle includes a counter-flow condenser.

[0009] Preferably, the condenser tube bundle of the co-flow condenser is arranged equilaterally at an angle of 40~60°, serving as the other two sides of the co-flow cooling triangle.

[0010] Preferably, the condenser tube bundle of the counterflow condenser is arranged equilaterally at an angle of 40~60°, serving as the other two sides of the counterflow cooling triangle.

[0011] As a preferred option, the co-current cooling triangle serves as the main flow zone for condensed steam, with steam flowing from top to bottom and condensate also flowing from top to bottom.

[0012] Preferably, within the counter-current cooling triangle, steam flows from bottom to top, while condensate flows from top to bottom.

[0013] The beneficial effects achieved by this utility model are: 1. The existing giant cooling triangle (a large heat exchange module) in the heat exchange system is optimized into multiple smaller cooling triangles, resulting in more uniform air distribution, smoother flow within the triangles, and higher heat exchange efficiency of the condenser tube bundle. 2. Each heat exchange module is equipped with independent co-current cooling triangles and counter-current cooling triangles, which is conducive to the full condensation of steam and the discharge of non-condensable gases; 3. Optimize the existing giant cooling triangle (a large heat exchange module) in the heat exchange system into multiple smaller cooling triangles, which are relatively smaller in size and easier to process, transport, and install on site; 4. For the same equivalent area, the footprint of a small cooling triangle is much smaller than that of a giant cooling triangle. By appropriately adjusting the angle of the cooling triangle, the diameter of the cooling tower can be reduced, thus reducing the footprint. 5. The small louvers corresponding to the small cooling triangle can effectively reduce the width of the louvers, enhance the rigidity of the equipment, and alleviate the vibration of the louver blades caused by the ambient wind. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the overall structure of this utility model (only three heat exchange modules are shown). Figure 2 This is a schematic diagram of the cooling triangle structure of this utility model; Figure 3 This is a schematic diagram of the air-cooling system connection of this utility model; The components are: 1. Heat exchange module; 11. Cooling triangle; 2. Louver; 3. Co-current condenser; 31. Co-current condensate branch pipe; 32. Co-current steam branch pipe; 4. Counter-current condenser; 32. Counter-current condensate branch pipe; 5. Steam distribution pipe; 6. Condensate pipe; 7. Vacuum pipe. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0016] like Figure 1 As shown, the present invention provides a natural ventilation direct air cooling system, which includes multiple heat exchange modules 1 arranged in a circular pattern outside the cooling tower.

[0017] Each heat exchange module 1 includes multiple cooling triangles 11, including at least one co-current cooling triangle and at least one counter-current cooling triangle.

[0018] Each co-current cooling triangle includes louvers 2 and at least one co-current condenser 3. The louvers 2 and the condenser tube bundle of the co-current condenser 3 together form an isosceles triangle, with the louvers 2 serving as the base on the windward side and the condenser tube bundle of the co-current condenser 3 serving as the isosceles side. In this embodiment, the condenser tube bundle is arranged with equilateral sides at an included angle of 40° to 60°, and the side length is 2 to 3 m.

[0019] The counter-flow cooling triangle and the co-flow cooling triangle have similar structures, both including louvers 2 and at least one counter-flow condenser 4. The louvers 2 and the condenser tube bundle of the counter-flow condenser 4 together form an isosceles triangle, with the louvers 2 serving as the base and located on the windward side; the condenser tube bundle of the counter-flow condenser 4 serves as the isosceles side. In this embodiment, the condenser tube bundle is arranged with equilateral sides at an included angle of 40° to 60°, with a side length of 2 to 3 meters.

[0020] Steam from the main steam pipe enters the corresponding co-current condenser 3 from top to bottom through the steam distribution pipe 5 and the co-current steam branch pipe 32. As the steam flows in the co-current condenser 3, it is continuously cooled into condensate, which flows into the co-current condensate branch pipe 31 at the bottom of the condenser. Steam that has not been fully condensed flows into the counter-current condenser 4 of the counter-current cooling triangle through the condensate pipe 6. Steam is condensed into condensate in the counter-current condenser 4, which flows into the counter-current condensate branch pipe 41 at the bottom of the condenser. The condensate in the co-current condensate branch pipe 31 and the counter-current condensate branch pipe 41 merge into the condensate pipe 6. Meanwhile, the gas that has not been condensed in the counter-current condenser 4 is extracted through the upper vacuum pipe 7.

[0021] In this example, each heat exchange module 1 includes three parallel co-current cooling triangles and one counter-current cooling triangle; each counter-current cooling triangle includes a counter-current condenser 4.

[0022] In this example, the co-current cooling triangle serves as the main flow zone for condensed steam, with both steam and condensate flowing from top to bottom. The counter-current cooling triangle functions to collect non-condensable gases while also accommodating condensed steam; within the counter-current cooling triangle, steam flows from bottom to top, and condensate flows from top to bottom.

[0023] In this example, a steam isolation valve is installed at the steam pipe inlet of each heat exchange module 1 to control the steam flow rate within the heat exchange module 1; all cooling triangles 1 within each heat exchange module 1 are put into operation or isolated as a whole.

[0024] The foregoing has shown and described the basic principles and main structural features of this utility model. This utility model is not limited to the above examples; various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A natural ventilation direct air-cooling system, characterized in that: The cooling tower includes multiple heat exchange modules (1), which are arranged in a circular pattern outside the cooling tower. Each heat exchange module (1) includes at least one co-current cooling triangle and at least one counter-current cooling triangle. Each co-current cooling triangle includes a louver (2) and at least one co-current condenser (3). The louver (2) is located on the windward side as one side of the co-current cooling triangle. The condenser tube bundle of the co-current condenser (3) is arranged at a set angle as the other two sides of the co-current cooling triangle. Each counter-current cooling triangle includes a louver (2) and at least one counter-current condenser (4). The louver (2) is located on the windward side as one side of the counter-current cooling triangle. The condenser tube bundle of the counter-current condenser (4) is arranged at a set angle as the other two sides of the counter-current cooling triangle. Steam from the main steam pipe enters the co-current condenser (3) of the co-current cooling triangle from top to bottom. During the flow, the steam is continuously cooled into condensate and flows into the co-current condensate branch pipe (31) at the bottom of the co-current condenser (3). The steam that is not fully condensed flows into the counter-current condenser (4) of the counter-current cooling triangle. The steam is condensed into condensate in the counter-current condenser (4) and flows into the counter-current condensate branch pipe (41) at the bottom of the counter-current condenser (4). The condensate from the co-current condensate branch pipe (31) and the counter-current condensate branch pipe (41) merges into the condensate pipe (6). The gas that is still not condensed in the counter-current cooling triangle is extracted through the upper vacuum pipe (7).

2. The natural ventilation direct air-cooling system according to claim 1, characterized in that: Each heat exchange module (1) includes three parallel-connected co-current cooling triangles and one counter-current cooling triangle.

3. The natural ventilation direct air cooling system according to claim 1, characterized in that: Each counter-flow cooling triangle includes a counter-flow condenser (4).

4. The natural ventilation direct air cooling system according to claim 1, characterized in that: The condenser tube bundle of the co-flow condenser (3) is set at an equilateral angle of 40~60°, serving as the other two sides of the co-flow cooling triangle.

5. The natural ventilation direct air cooling system according to claim 1, characterized in that: The condenser tube bundle of the counterflow condenser (4) is set with equilateral sides at an angle of 40~60°, serving as the other two sides of the counterflow cooling triangle.

6. The natural ventilation direct air-cooling system according to claim 1, characterized in that: The co-current cooling triangle serves as the main flow zone for condensed steam, with steam flowing from top to bottom and condensate also flowing from top to bottom.

7. The natural ventilation direct air-cooling system according to claim 1, characterized in that: In the counter-current cooling triangle, steam flows from bottom to top, while condensate flows from top to bottom.

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