Optimal arrangement method of fan-shaped fillers in super-large wet cooling tower under crosswind

Abstract

The application provides a method for optimizing arrangement of fan-shaped fillers in an ultra-large wet cooling tower under crosswind, when the wind speed in the operation environment of the ultra-large wet cooling tower is less than or equal to a set wind speed value, the filler area is filled with fillers with two different pitches, different pitch fillers are arranged in a first area on the windward side and a second area on the leeward side; when the wind speed in the operation environment of the ultra-large wet cooling tower is greater than the set wind speed value, the filler area is filled with fillers with two different pitches, fillers with a first pitch are arranged in the first area on the windward side and a third area on the leeward side, and fillers with a second pitch are arranged in the second area on the leeward side; the application solves the problem of uneven distribution of the aerodynamic field in the ultra-large wet cooling tower under crosswind, and can more fully exert the heat and mass transfer performance of the fillers.

Description

Technical Field

[0001] This invention relates to the field of ultra-large wet cooling tower technology for thermal power plants, and particularly to a method for optimizing the arrangement of fan-shaped packing in ultra-large wet cooling towers under crosswind conditions. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In thermal power plants, the cold-end system largely determines the unit output. As a crucial cold-end component, the cooling tower's cooling efficiency directly impacts the power plant's power generation efficiency. With increasing unit capacity, the bottom diameter of cooling towers is continuously increasing; cooling towers with a bottom diameter exceeding 100 meters are termed ultra-large wet cooling towers. Currently, the main packing arrangements for ultra-large wet cooling towers are uniform packing and annular non-uniform packing.

[0004] Due to the excessively large diameter of the bottom of the cooling tower, the air velocity and temperature field distribution inside the tower are uneven. The uniform packing arrangement results in poor heat exchange in the central area of ​​the tower and low cooling efficiency. More and more ultra-large wet cooling towers are adopting annular non-uniform packing arrangement, which can effectively improve the cooling efficiency of the cooling tower under windless conditions.

[0005] However, the inventors discovered that during actual operation, crosswinds disrupt the symmetrical distribution of the aerodynamic field inside the cooling tower, further damaging the uniformity of the aerodynamic field and weakening the optimization effect of the annular non-uniform packing arrangement on the cooling tower. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an optimized arrangement method for fan-shaped packing in ultra-large wet cooling towers under crosswind conditions. This method solves the problem of uneven aerodynamic field distribution within ultra-large wet cooling towers under crosswind conditions and can more fully utilize the heat and mass transfer performance of the packing.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of this invention provides a method for optimizing the arrangement of fan-shaped packing in ultra-large wet cooling towers under crosswind conditions.

[0009] An optimized arrangement method for fan-shaped packing of an ultra-large wet cooling tower under crosswind conditions: when the wind speed in the operating environment of the ultra-large wet cooling tower is less than or equal to a set wind speed value, the packing area is filled with two types of packing with different sheet spacings, and different sheet spacing packings are set in the first area on the windward side and the second area on the leeward side.

[0010] The determination of the first and second regions includes:

[0011] The first circle is the projection of the filling area onto the bottom surface. The second circle is set on the side away from the windward side. The first circle and the second circle have the same radius. The line connecting the center of the first circle and the center of the second circle is in the same direction as the wind in the operating environment or the angle difference is within the set range.

[0012] The distance between the center of the first circle and the center of the second circle is greater than or equal to zero, and less than or equal to the radius of the bottom circle of the ultra-large wet cooling tower. The intersection area of ​​the first circle and the second circle is the second region, and the remaining area of ​​the first circle after removing the second region is the first region.

[0013] As an optional implementation, both the first and second regions are filled with S-wave packing, and the spacing between the S-wave packing sheets in the first region is smaller than that in the second region.

[0014] As a further limitation, the sheet spacing of the first region is 26mm S-wave packing, and the sheet spacing of the second region is 30mm S-wave packing.

[0015] As an optional implementation method, the wind speed is set to 3m / s.

[0016] A second aspect of the present invention provides an ultra-large wet cooling tower for crosswind operation.

[0017] A crosswind-resistant ultra-large wet cooling tower includes a fan-shaped packing zone, wherein the fan-shaped packing zone is arranged using the crosswind-resistant ultra-large wet cooling tower fan-shaped packing optimized arrangement method described in the first aspect of this invention.

[0018] The third aspect of this invention provides a method for optimizing the arrangement of fan-shaped packing in ultra-large wet cooling towers under crosswind conditions.

[0019] An optimized arrangement method for fan-shaped packing of an ultra-large wet cooling tower under crosswind conditions: when the wind speed in the operating environment of the ultra-large wet cooling tower is greater than the set wind speed value, the packing area is filled with two kinds of packing with different spacing. The first spacing packing is set in the first area on the windward side and the third area on the leeward side, and the second spacing packing is set in the second area on the leeward side.

[0020] The determination of the first and second regions includes:

[0021] The first circle is the projection of the filling area on the bottom surface. The second and third circles are set on the side away from the windward side. The first circle and the second circle have the same radius. The line connecting the center of the first circle, the center of the second circle and the center of the third circle is the same as the wind direction of the operating environment or the angle difference is within the set range.

[0022] The distance between the center of the first circle and the center of the second circle is greater than or equal to zero, and less than or equal to the radius of the bottom circle of the ultra-large wet cooling tower. The intersection area of ​​the first circle and the second circle is the leeward area. The remaining area after removing the second area from the first circle is the first area. The intersection area of ​​the third circle and the second circle is the third area. The remaining area after removing the third area from the leeward area is the second area.

[0023] The radius of the third circle is greater than or equal to 0.2 times the radius of the bottom circle of the ultra-large wet cooling tower, and less than or equal to 0.6 times the radius of the bottom circle of the ultra-large wet cooling tower.

[0024] As an optional implementation, the packing material in the first, second, and third regions is S-wave packing material. The S-wave packing material spacing in the first and third regions is the same, while the S-wave packing material spacing in the first and third regions is smaller than that in the second region.

[0025] As a further limitation, the sheet spacing of the packing material in the first and third regions is 26 mm S-wave packing material, and the sheet spacing of the packing material in the second region is 30 mm S-wave packing material.

[0026] As an optional implementation method, the wind speed is set to 3m / s.

[0027] The fourth aspect of the present invention provides an ultra-large wet cooling tower under crosswind conditions, including a fan-shaped packing area, wherein the fan-shaped packing area is arranged using the optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind conditions described in the third aspect of the present invention.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswinds described in this invention proposes a new packing arrangement method for different crosswind speeds, thereby changing the problem of uneven aerodynamic field distribution inside ultra-large wet cooling towers under crosswinds that exists in traditional arrangement methods.

[0030] 2. This invention proposes a fan-shaped packing arrangement for crosswind environments. Packing materials with varying spacing are arranged in different areas. When the crosswind speed is low, packing materials with larger spacing and better resistance are arranged in the leeward area, while packing materials with smaller spacing and better thermal performance are arranged in the windward area. When the wind speed is high, packing materials with smaller spacing are arranged in the windward area (i.e., the first area) and the leeward area 2 (i.e., the third area), while packing materials with larger spacing are arranged in the leeward area 1 (i.e., the second area). Because the packing materials with larger spacing have better resistance, the wind speed in the leeward side and the central area of ​​the cooling tower is increased, which enhances the heat exchange between air and water. In addition, the wind speed on the windward side is relatively high, and the use of packing materials with smaller spacing and better thermal performance can ensure sufficient heat exchange between air and water.

[0031] 3. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind described in this invention achieves the best relative matching between packing and airflow, fully utilizes the heat and mass transfer performance of packing, further enhances heat and mass transfer between air and water, reduces the outlet water temperature, improves the cooling efficiency of the cooling tower, and thus reduces the coal consumption of the generator set. Attached Figure Description

[0032] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0033] Figure 1 A schematic diagram of the packing arrangement consisting of two packing sections provided in Embodiment 1 of the present invention;

[0034] Figure 2 A schematic diagram of the two-packing zone division structure provided in Embodiment 1 of the present invention;

[0035] Figure 3 A top view of the packing arrangement consisting of two packing sections provided in Embodiment 1 of the present invention;

[0036] Figure 4 A schematic diagram of the packing arrangement consisting of three packing sections provided in Embodiment 3 of the present invention;

[0037] Figure 5 A schematic diagram of the three-packing zone division structure provided in Embodiment 3 of the present invention;

[0038] Figure 6 A top view of the packing arrangement consisting of three packing sections provided in Embodiment 3 of the present invention;

[0039] Among them, 1. Cooling tower; 2. 30mm S-wave packing; 3. 26mm S-wave packing. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0044] Example 1:

[0045] Embodiment 1 of the present invention provides an optimized arrangement method for fan-shaped packing of an ultra-large wet cooling tower under crosswind conditions. When the wind speed in the operating environment of the ultra-large wet cooling tower is less than or equal to a set wind speed value, the packing area is filled with two kinds of packing with different sheet spacings. Different sheet spacing packings are set in the first area (i.e., the windward area) on the windward side and the second area (i.e., the leeward area) on the leeward side.

[0046] The determination of the first and second regions includes:

[0047] The first circle is the projection of the filling area onto the bottom surface. The second circle is set on the side away from the windward side. The first circle and the second circle have the same radius. The line connecting the center of the first circle and the center of the second circle is in the same direction as the wind in the operating environment or the angle difference is within the set range.

[0048] The distance between the center of the first circle and the center of the second circle is greater than or equal to zero, and less than or equal to the radius of the bottom circle of the ultra-large wet cooling tower. The intersection area of ​​the first circle and the second circle is the second region, and the remaining area of ​​the first circle after removing the second region is the first region.

[0049] In this embodiment, the first circle and the second circle are circles with the same base.

[0050] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, when the packing area consists of two packing zones, it is suitable for ultra-large wet cooling towers with an ambient wind speed of no more than 3 m / s. The packing consists of windward packing 3 and leeward packing 2. The distance R1 between the centers of the two circles with equal bases is in the range of 0 ≤ R1 ≤ R, where R is the base radius of the ultra-large wet cooling tower. 30 mm S-wave packing is used, and 26 mm S-wave packing is used for the windward packing 3.

[0051] Example 2:

[0052] Embodiment 2 of the present invention provides an ultra-large wet cooling tower under crosswind conditions, including a fan-shaped packing area, wherein the fan-shaped packing area is arranged using the optimized arrangement method of fan-shaped packing for ultra-large wet cooling tower under crosswind conditions described in Embodiment 1 of the present invention.

[0053] Example 3:

[0054] Embodiment 3 of the present invention provides an optimized arrangement method for fan-shaped packing of an ultra-large wet cooling tower under crosswind conditions. When the wind speed in the operating environment of the ultra-large wet cooling tower is greater than the set wind speed value, the packing area is filled with two kinds of packing with different sheet spacings. The first sheet spacing packing is set in the first area on the windward side and the third area on the leeward side, and the second sheet spacing packing is set in the second area on the leeward side.

[0055] The determination of the first and second regions includes:

[0056] The first circle is the projection of the filling area on the bottom surface. The second and third circles are set on the side away from the windward side. The first circle and the second circle have the same radius. The line connecting the center of the first circle, the center of the second circle and the center of the third circle is the same as the wind direction of the operating environment or the angle difference is within the set range.

[0057] The distance between the center of the first circle and the center of the second circle is greater than or equal to zero, and less than or equal to the radius of the bottom circle of the ultra-large wet cooling tower. The intersection area of ​​the first circle and the second circle is the leeward area. The remaining area after removing the second area from the first circle is the first area. The intersection area of ​​the third circle and the second circle is the third area. The remaining area after removing the third area from the leeward area is the second area.

[0058] The radius of the third circle is greater than or equal to 0.2 times the radius of the bottom circle of the ultra-large wet cooling tower, and less than or equal to 0.6 times the radius of the bottom circle of the ultra-large wet cooling tower.

[0059] Specifically, such as Figure 4 , Figure 5 and Figure 6 As shown, when the packing zone consists of 3 packing sections, it is suitable for ultra-large wet cooling towers with ambient wind speeds greater than 3 m / s. The packing zone includes the windward side area (i.e., the first area), the leeward side area 1 (i.e., the second area), and the leeward side area 2 (i.e., the third area). Correspondingly, the packing consists of windward side packing, leeward side area 1 packing, and leeward side area 2 packing. The radius of the circle of leeward side area 2 (i.e., the third area) is: The windward side area uses 26mm S-wave packing, and the center distance R1 of the two circles with the same base is in the range of 0≤R1≤R. The leeward side area 1 (i.e., the second area) does not include the leeward side area 2 (i.e., the third area). The leeward side area 1 (i.e., the second area) uses 30mm S-wave packing, where R is the base radius of the ultra-large wet cooling tower.

[0060] In this embodiment, the first circle, the second circle, and the third circle are all circles with the same base.

[0061] Example 4:

[0062] Embodiment 4 of the present invention provides an ultra-large wet cooling tower under crosswind conditions, including a fan-shaped packing area, wherein the fan-shaped packing area is arranged using the optimized arrangement method of fan-shaped packing for ultra-large wet cooling tower under crosswind conditions described in Embodiment 3 of the present invention.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for optimizing the arrangement of fan-shaped packing in an ultra-large wet cooling tower under crosswind conditions, characterized in that: When the wind speed in the operating environment of the ultra-large wet cooling tower is less than or equal to the set wind speed value, the packing area is filled with two kinds of packing with different sheet spacings. Different sheet spacing packings are set in the first area on the windward side and the second area on the leeward side. The determination of the first and second regions includes: The first circle is the projection of the filling area onto the bottom surface. The second circle is set on the side away from the windward side. The first circle and the second circle have the same radius. The line connecting the center of the first circle and the center of the second circle is in the same direction as the wind in the operating environment or the angle difference is within the set range. The distance between the center of the first circle and the center of the second circle is greater than zero and less than or equal to the radius of the bottom circle of the ultra-large wet cooling tower. The intersection area of ​​the first circle and the second circle is the second region, and the remaining area of ​​the first circle after removing the second region is the first region.

2. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in claim 1, characterized in that: Both the first and second regions are filled with S-wave packing, and the spacing between the S-wave packing pieces in the first region is smaller than that in the second region.

3. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in claim 1 or 2, characterized in that: The first zone uses S-wave packing with a 26mm spacing, while the second zone uses S-wave packing with a 30mm spacing.

4. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in claim 1, characterized in that: The wind speed is set to 3 m / s.

5. A super-large wet cooling tower for crosswind operation, characterized in that: It includes a sector-shaped packing area, which is arranged using the optimized arrangement method of sector-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in any one of claims 1-4.

6. A method for optimizing the arrangement of fan-shaped packing in an ultra-large wet cooling tower under crosswind conditions, characterized in that: When the wind speed in the operating environment of the ultra-large wet cooling tower is greater than the set wind speed value, the packing area is filled with two kinds of packing with different sheet spacing. The first sheet spacing packing is set in the first area on the windward side and the third area on the leeward side, and the second sheet spacing packing is set in the second area on the leeward side. The determination of the first and second regions includes: The first circle is the projection of the filling area on the bottom surface. The second and third circles are set on the side away from the windward side. The first circle and the second circle have the same radius. The line connecting the center of the first circle, the center of the second circle and the center of the third circle is the same as the wind direction of the operating environment or the angle difference is within the set range. The distance between the center of the first circle and the center of the second circle is greater than zero and less than or equal to the radius of the bottom circle of the ultra-large wet cooling tower. The intersection area of ​​the first circle and the second circle is the leeward area. The remaining area after removing the second area from the first circle is the first area. The intersection area of ​​the third circle and the second circle is the third area. The remaining area after removing the third area from the leeward area is the second area. The radius of the third circle is greater than or equal to 0.2 times the radius of the bottom circle of the ultra-large wet cooling tower, and less than or equal to 0.6 times the radius of the bottom circle of the ultra-large wet cooling tower.

7. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in claim 6, characterized in that: The packing material in the first, second, and third regions is all S-wave packing. The spacing between the S-wave packing pieces in the first and third regions is the same, while the spacing between the S-wave packing pieces in the first and third regions is smaller than that in the second region.

8. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in claim 6 or 7, characterized in that: The first and third zones use 26mm S-wave packing, while the second zone uses 30mm S-wave packing.

9. The optimized arrangement method of fan-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in claim 6, characterized in that: The wind speed is set to 3 m / s.

10. A super-large wet cooling tower for crosswind operation, characterized in that: It includes a sector-shaped packing area, which is arranged using the optimized arrangement method of sector-shaped packing for ultra-large wet cooling towers under crosswind conditions as described in any one of claims 6-9.

Images