Wind shielding structure of cooling triangle of indirect cooling tower

Abstract

The utility model discloses a wind shield structure for cooling triangles of an indirect cooling tower, which is characterized in that shutters for ventilation are arranged on the periphery of the bottom of the indirect cooling tower, the cooling triangles capable of directly ventilating towards the interior of the indirect cooling tower are formed between adjacent shutters, and the wind shield structure comprises wind shields adjustably arranged at the air leakage positions of the edges of the shutters; a wind shield frame is arranged at the air leakage position of the edge of the louver, and a wind shield is installed on the wind shield frame. Ventilation holes are uniformly formed in the wind shield; the wind shield is arranged on the wind shield frame through a rotating mechanism. The wind shield is applied to a cold tower, the temperature of a pipe bundle at the air leakage position of the cooling triangle provided with the wind shield can be kept above 0 DEG C all the time, and it is guaranteed that the edge zone of the cooling triangle is not frozen in the low-temperature winter.

Description

Technical Field

[0001] The utility model relates to the technical field of the maintenance structure of an indirect cooling tower, in particular to a wind shielding structure for a cooling triangle of an indirect cooling tower. Background Art

[0002] Two units of a certain power plant's first phase were put into commercial operation in September and November 2020 respectively. At the initial stage of production, it happened to be the winter season, and the freezing damage events of the indirect cooling system equipment of the same type of thermal power units in the northwest region occurred frequently, with huge maintenance costs. Especially in the extremely cold weather in winter at the power plant, the steam temperature is below -25°C, and the strong wind weather accounts for more than half of the extremely cold weather. The anti-freezing pressure of the indirect cooling system is arduous. To avoid equipment damage, the indirect cooling systems of Unit 1 and Unit 2 of the power plant adopt the methods of high water temperature, high back pressure, and starting additional circulating water pumps for anti-freezing. However, the resulting problem of high power generation costs is more prominent. Therefore, it is particularly necessary to carry out anti-freezing and energy-saving optimization work.

[0003] During the winter operation of Unit 1 and Unit 2 of this power plant, due to the low ambient temperature, there are gaps on both sides of each louver of the indirect cooling tower. When the ambient temperature is too low, even if the louver opening is very small, the heat exchange tubes near both sides of the louver leak air due to the gaps, and the temperature of the tubes at the edge is still likely to drop to 0°C, extremely likely to cause the tubes to freeze and crack. And if the louver opening is kept small for a long time, the temperature of the tubes inside the radiator is high, resulting in the circulating water temperature always being on the high side, the back pressure of the unit operation increasing, and thus the coal consumption of the unit increasing. Content of the Utility Model

[0004] The purpose of the utility model is to provide a wind shielding structure for a cooling triangle of an indirect cooling tower, so as to effectively reduce the wind speed and the air intake volume, and keep the return water temperature of each heat exchange tube basically within a relatively constant range; when ensuring that the tubes of the system will not freeze and crack, keep the temperature of each part of the cooling triangle above 10°C.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model provides a wind shielding structure for a cooling triangle of an indirect cooling tower, wherein louvers for ventilation are arranged around the bottom of the indirect cooling tower, and a cooling triangle that can directly ventilate into the indirect cooling tower is formed between adjacent louvers, including a wind shielding plate adjustably arranged at the air leakage position of the louver edge;

[0007] A wind shielding plate frame is arranged at the air leakage position of the louver edge, and a wind shielding plate is installed on the wind shielding plate frame; ventilation holes are uniformly opened on the wind shielding plate; the wind shielding plate is arranged on the wind shielding plate frame through a rotating mechanism.

[0008] Further, a plurality of spliced windshields are hingedly arranged within the windshield frame, and the windshields are metal perforated plates.

[0009] Furthermore, the flow-through area of the windshields is between 90% and 95%.

[0010] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0011] The windshields in this application are applied to the cold triangle position of the cooling tower. Among them, the temperature of the tube bundle at the air leakage point of the cooling triangle where the windshields are installed can always be maintained above 0°C, ensuring that the edge area of the cooling triangle does not freeze in winter when the temperature is relatively low. Description of the Drawings

[0012] The following further describes the present utility model in conjunction with the drawings.

[0013] Figure 1 It is a schematic diagram of the inclination angle of the windshield structure of the cooling triangle of the indirect cooling tower of the present utility model;

[0014] Figure 2 It is a schematic plan view of the windshield structure of the cooling triangle of the indirect cooling tower of the present utility model;

[0015] Figure 3 It is a schematic diagram of the external louvers of the cooling triangle of the indirect cooling tower of the present utility model;

[0016] Figure 4 It is a schematic diagram of the position of the cooling triangle and the louvers of the indirect cooling tower of the present utility model;

[0017] Figure 5 It is a schematic diagram of the installation position of the windshields of the cooling triangle of the indirect cooling tower of the present utility model;

[0018] Figure 6 For Figure 5 The adjustment schematic diagram of the louvers in;

[0019] Figure 7 It is a schematic top view of the windshield structure of the cooling triangle of the indirect cooling tower of the present utility model.

[0020] Description of the reference numerals: 1, water inlet pipe; 2, water return pipe; 3, windshield; 301, ventilation hole; 302, rotating mechanism; 4, louver; 5, indirect cooling tower; 6, cooling triangle. Detailed Embodiments

[0021] This embodiment discloses a windshield structure for the cooling triangle of an indirect cooling tower. As Figure 4 shown, louvers 4 for ventilation are installed around the bottom of the indirect cooling tower 5, and a cooling triangle 6 that can directly ventilate into the interior of the indirect cooling tower is formed between adjacent louvers 4;

[0022] In this embodiment, a wind baffle 3 is designed at the cooling triangle 6, that is, the wind baffle 3 is installed in an adjustable manner at the air leakage point at the edge of the louvers;

[0023] In this embodiment, specifically, one wind baffle 3 is installed outside the heat dissipation tube bundles on both sides of the cooling triangle 6 of the indirect cooling tower 5 close to the louvers;

[0024] The wind baffle 3 is made of an aluminum plate with a thickness of 10 mm, a length of 1000 mm, and a height of 2860 mm (as shown below), and through holes with a diameter of 30 mm are opened on this wind baffle, with a total of 963 holes opened. At this time, the flow-through area will reach 95%. Then, this wind baffle is fixed on the wind baffle frame using M5*2 self-tapping screws, and movable screws are installed on the upper and lower short sides of the wind baffle 3; the movable screws can be used as a locking device and positioned and installed on the wind baffle frame; Figure 2 When in use

[0025] When the unit enters the winter season, the wind baffle 3 is put into operation. Its arrangement direction is perpendicular to the air inlet of the louvers 4, used for wind blocking to protect the heat dissipation tube bundles and prevent freezing, and the return water temperature of the circulating water is controlled within an ideal range.

[0026] When the unit enters other seasons, the wind baffle is withdrawn from operation. At this time, the wind baffle 3 is perpendicular to the louvers 4, and the gap between the wind baffle and the cold triangle radiator is 400 mm; the wind baffle does not affect the heat exchange effect of the radiator at all under non-winter conditions.

[0027] As shown in the figure, the heat dissipation tube bundle includes a water inlet pipe 1 and a water return pipe 2; after the installation of the wind baffle 3 at the cooling triangle 6 is completed, the return water temperature and the cooling column temperature of the entire heat dissipation tube bundle can be maintained within a relatively constant range. At this time, the temperature of the heat dissipation tube bundle can be monitored more effectively through remote temperature measurement points, and this method has been verified and modified on-site many times. By increasing the diameter and number of ventilation holes, the situation of poor heat dissipation of the cold triangle tube bundle after the installation of the wind baffle is solved. By adding a movable connecting rod device, the need for frequent installation and disassembly of the wind baffle due to the conversion of winter and summer operating conditions is avoided.

[0028] As Figure 1 shown, after the transformation, the temperatures of each part of the cooling triangle are measured, and the results are as follows:

[0029] After the transformation, the temperatures of each part of the cooling triangle are measured, and the results are as follows:

[0030]

[0031] The results show that the wind blocking effect is remarkable. The temperature of the tube bundle at the air leakage point of the cooling triangle where the wind baffle is installed can always be kept above 0 °C, ensuring that no freezing occurs in the edge area of the cooling triangle.

[0032] At present, the retrofit project has been trial-installed on some cooling triangles of Unit #2, and subsequent installation will be further promoted according to the verification results of multi-condition tests.

[0033] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A wind shield structure for a cooling triangle of an intercooling tower, wherein louvers for ventilation are arranged around the bottom of the intercooling tower, wherein a cooling triangle is formed between adjacent louvers for direct ventilation into the interior of the intercooling tower, characterized in that: It includes a wind deflector adjustably arranged at the wind leakage position of the edge of the shutter; A windshield frame is arranged at the air leakage position at the edge of the shutter, and a windshield is installed on the windshield frame; ventilation holes are evenly opened on the windshield; and the windshield is arranged on the windshield frame through a rotating mechanism.

2. The wind shielding structure of the cooling triangle of the intercooling tower according to claim 1 is characterized in that: A plurality of spliced ​​windshields are hingedly arranged in the windshield frame, and the windshields are metal perforated plates.

3. The wind shielding structure of the cooling triangle of the intercooling tower according to claim 1 is characterized in that: The flow area of ​​the wind shield is 90-95%.

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