An indirect cooling tower cooling structure and operation strategy

Abstract

The application provides an indirect air cooling tower cooling structure and operation strategy, which comprises a first cooling column, a second cooling column, a transverse guide rail, a louver, a connecting unit and a longitudinal guide rail; the first end of the first cooling column is rotationally connected with the connecting unit, and the second end is movably installed on the transverse guide rail; the first end of the second cooling column is rotationally connected with the connecting unit, and the second end is movably installed on the transverse guide rail; the first cooling column, the second cooling column and the louver constitute a cooling triangular structure; the position of the second end of the first cooling column on the transverse guide rail is changed by moving, the position of the second end of the second cooling column on the transverse guide rail is changed by moving, and the position of the connecting unit is changed at the same time, so that the top included angle between the first end of the first cooling column and the first end of the second cooling column is changed. One technical effect of the application is that the design is reasonable, and the safe and stable operation of the indirect air cooling tower can be ensured.

Description

Technical Field

[0001] This invention belongs to the field of indirect air-cooled tower technology, specifically relating to an indirect air-cooled tower cooling structure and operation strategy. Background Technology

[0002] Cooling towers are the cold source for thermal power units, used to cool the circulating water. Compared to wet cooling towers, indirect air-cooled towers (hereinafter referred to as "indirect cooling towers") have excellent water-saving performance, and therefore are widely used in coal-fired power units in coal-rich and water-scarce regions such as Northwest my country. The thermal performance of cooling towers has a significant impact on the operating economy of thermal power units. For indirect cooling towers, their cooling performance is mainly affected by the structure of the indirect air-cooled radiator, the size of the indirect cooling tower, the heat exchange method of the radiator, and environmental meteorological conditions, especially crosswinds.

[0003] Due to the climate characteristics of Northwest my country, which is characterized by high temperatures in summer and severe cold in winter, the insufficient cooling capacity of the indirect cooling tower during summer operation can easily lead to high circulating water outlet temperature, high condenser back pressure, and limited unit output. During winter operation, the extreme cold can easily cause the heat exchange tube bundles of the indirect air-cooled radiators in the middle of the indirect cooling tower to freeze and crack, affecting the safe operation of the unit. In addition, during normal operation, uneven air intake at the bottom of the indirect cooling tower and poor heat exchange capacity of some indirect air-cooled radiators due to side air intake can affect the efficient operation of the indirect cooling tower.

[0004] Indirect air-cooled radiators are the most important and complex structure in indirect cooling towers. In engineering construction, to improve space utilization efficiency and save on supporting structures and construction investment, indirect air-cooled radiators are typically arranged in a cooling triangle. Several air-cooled heat exchangers are connected in series to form cooling columns on both sides of the triangle, with the third side serving as an air passage. Louvers are installed on the air passage to regulate airflow. The apex angle of the cooling triangle determines the degree of deflection of the airflow through the heat exchange tube bundle, and its magnitude directly affects the airflow state and additional resistance at the inlet and outlet of the heat exchange tube bundle, significantly impacting its heat exchange performance. In extreme low temperatures during winter, due to the large heat dissipation area and excessively low surface temperature of the radiator cooling columns, the circulating water temperature drops too drastically, leading to freezing and cracking of the heat exchange tube bundle.

[0005] Therefore, there is an urgent need for an indirect cooling tower structure and operation strategy to solve the above-mentioned technical problems. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a new technical solution for the cooling structure and operation strategy of the indirect cooling tower.

[0007] According to a first aspect of the present invention, an indirect cooling tower structure is provided, comprising:

[0008] First cooling column, second cooling column, transverse guide rail, louvers, connecting unit and longitudinal guide rail;

[0009] The first end of the first cooling column is rotatably connected to the connecting unit, and the second end is movably mounted on the transverse guide rail; the first end of the second cooling column is rotatably connected to the connecting unit, and the second end is movably mounted on the transverse guide rail; the connecting unit is movably disposed on the longitudinal guide rail, that is, the connecting unit can move along the extension direction of the longitudinal guide rail; the louver is provided between the second end of the first cooling column and the second end of the second cooling column.

[0010] The first cooling column, the second cooling column, and the louver form a cooling triangle structure, and the louver is located in the air channel of the cooling triangle structure; by moving and changing the position of the second end of the first cooling column on the horizontal guide rail and moving and changing the position of the second end of the second cooling column on the horizontal guide rail, the position of the connecting unit is changed, thereby changing the top angle between the first end of the first cooling column and the first end of the second cooling column.

[0011] Both the first and second cooling columns have a circulating water supply unit and a circulating water return unit. The circulating water return unit has a vertically distributed return water pipe bundle inside. Circulating water is drawn out sequentially through the circulating water supply unit, the return water pipe bundle of the circulating water return unit, and the circulating water return header. The return water pipe bundle is provided with multiple intermediate water collection tanks at intervals from top to bottom. By selecting a certain intermediate water collection tank as the extraction endpoint, the extraction process of the circulating water return unit is determined, thereby indirectly realizing the change and control of the heat exchange area and heat exchange time of the circulating water in the radiator.

[0012] Optionally, the cooling structure of the indirect cooling tower also includes the indirect cooling tower body, the inner ring cooling column, and the circulating water pump;

[0013] The bottom of the indirect cooling tower body is uniformly arranged with multiple cooling triangular structures in a ring around it, and the multiple cooling triangular structures form an outer ring; an inner ring cooling column is provided inside the bottom of the indirect cooling tower body, and the inner ring cooling column is arranged inside the tower with the circulating water supply unit side close to the outer ring and the circulating water return unit side close to the indirect cooling tower body; the circulating water pump is provided on the connecting pipe between the outer ring and the inner ring cooling column.

[0014] Optionally, the cooling structure of the indirect cooling tower also includes an extraction water pipe and a regulating valve;

[0015] Each of the intermediate water collection tanks is connected to a water extraction pipe, and each of the water extraction pipes is equipped with a regulating valve.

[0016] Optionally, the range of the top included angle is 60° to 150°, that is, the variable angle range of the top included angle is 60° to 150°.

[0017] Optionally, the extraction process is k, and the number of processes is n;

[0018] Then k = 1 to n, 1 ≤ n ≤ 6.

[0019] Optionally, a temperature sensor is installed on the inner wall of the upstream return water pipe bundle connected to each of the intermediate water collection tanks.

[0020] Optionally, the inner ring cooling columns are arranged between adjacent cooling triangle structures;

[0021] The inner ring cooling column has a circulating water supply unit and a circulating water return unit. The circulating water return unit is equipped with a vertically distributed return water pipe bundle. The circulating water is drawn out by sequentially passing through the circulating water supply unit and the return water pipe bundle of the circulating water return unit. The return water pipe bundle is provided with multiple intermediate water collection tanks at intervals from top to bottom. By selecting a certain intermediate water collection tank as the extraction endpoint, the return water flow of the circulating water return unit is determined, thereby indirectly realizing the change and control of the heat exchange area and heat exchange time of the circulating water in the radiator.

[0022] Optionally, the inner ring cooling column is arranged in a ring with the bottom center of the indirect cooling tower body as the center, and the diameter of the inner ring is not less than 85% of the bottom diameter of the indirect cooling tower body.

[0023] Optionally, the outer ring and the inner ring cooling column can operate independently;

[0024] Alternatively, the outer ring and the inner ring cooling column can be connected in series via the circulating water pump.

[0025] According to a second aspect of the present invention, an operating strategy for an indirect cooling tower structure is provided, applied to the indirect cooling tower structure as described in the first aspect, comprising:

[0026] Under normal operating conditions, with the louvers in the air duct fully open and crosswinds present, when the outlet temperature of the cooling tower circulating water is 1-6°C higher than the design temperature, the system is adjusted by gradually increasing the top angle of the cooling triangle structure in the crosswind inlet section; for every 1°C the outlet temperature of the cooling tower circulating water is higher than the design temperature, the top angle of the cooling triangle structure is increased by 30°.

[0027] In summer operation, with all the louvers in the air channel fully open, the included angle of the top of all the cooling triangular structures around the bottom of the indirect cooling tower body is increased to 150°. When the outlet temperature of the circulating water of the indirect cooling tower is 10° or more higher than the design temperature, the circulating water pump is turned on. The circulating water of the indirect cooling tower first passes through the inner ring cooling column arranged inside the bottom of the tower and then is pumped to the outer ring cooling triangular structure around the bottom of the tower.

[0028] In winter operation, with all louvers in the air channel closed, the included angle of the top of all cooling triangular structures on the outer periphery of the base of the indirect cooling tower is reduced to 60°. Temperature data of the return water pipe bundle corresponding to the intermediate water collection tank is monitored by various temperature sensors. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of extraction process k is 0°C, extraction process k+1 is started.

[0029] Under extreme climatic conditions, when the lowest temperature among all the temperature measuring points on the pipe walls of the return water pipes upstream of the extraction process n of more than 50% of the outer ring cooling triangle structure is 0℃, the circulating water pump is activated to pump the circulating water in the outer ring cooling triangle structure to the inner ring cooling column section, and only the inner ring cooling column section arranged inside the tower bottom is used for the circulating water cooling work.

[0030] Specifically, for the inner ring cooling column, the temperature data of the return water pipe bundle corresponding to the intermediate water collection tank is monitored by various temperature sensors. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of extraction process k is 0℃, extraction process k+1 is started. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of extraction process n for more than 50% of the inner ring cooling columns is 0℃, the circulating water inlet is shut off and the indirect cooling tower is taken out of operation.

[0031] One technical advantage of this invention is that:

[0032] In this embodiment of the application, by changing the top angle between the first end of the first cooling column and the first end of the second cooling column, the air intake of the first cooling column and the second cooling column on both sides of the cooling triangle structure is indirectly changed.

[0033] Furthermore, by selecting different intermediate water collection tanks as the extraction endpoint, the extraction process of the circulating water return unit is determined, thereby changing the heat exchange process and heat exchange time of the circulating water inside the cooling triangle structure.

[0034] Therefore, under summer operating conditions and normal operating conditions, the indirect cooling tower cooling structure and operation strategy provided in this application can improve the heat exchange capacity of the indirect air-cooled radiator, reduce the adverse effects of ambient crosswinds on the indirect air-cooled radiator, and minimize the outlet temperature of the circulating water in the indirect cooling tower.

[0035] In winter operation, it can minimize the outlet temperature of the cooling tower circulating water while preventing freezing. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the cooling triangle structure of an indirect cooling tower cooling structure according to an embodiment of the present invention;

[0037] Figure 2 This is a top view of the cooling triangle structure of an indirect cooling tower according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of a cooling tower cooling structure according to an embodiment of the present invention, including a circulating water supply unit, a circulating water return unit, an intermediate water collection tank on the side of the circulating water return unit, and a regulating valve.

[0039] Figure 4 This is a top view schematic diagram of the cooling column water pipe bundle, return water pipe bundle structure and process of an indirect cooling tower cooling structure according to an embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of an indirect cooling tower according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the outer ring, inner ring cooling column, and circulating water pump according to an embodiment of the present invention.

[0042] In the diagram: 1. First cooling column; 2. Second cooling column; 3. Horizontal guide rail; 4. Louver; 5. Longitudinal guide rail; 51. Connecting unit; 61. Circulating water supply unit; 62. Circulating water return unit; 71. Water supply pipe bundle; 72. Water return pipe bundle; 8. Intermediate water collection tank; 9. Regulating valve; 10. Water outlet pipe; 11. Indirect cooling tower body; 12. Outer ring; 13. Inner ring cooling column; 14. Circulating water pump. Detailed Implementation

[0043] Various exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application.

[0044] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0045] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0046] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] According to a first aspect of the invention, see Figures 1 to 6 A cooling tower structure is provided, including a first cooling column 1, a second cooling column 2, a transverse guide rail 3, louvers 4, a connecting unit 51, and a longitudinal guide rail 5; wherein the transverse guide rail 3 and the longitudinal guide rail 5 are perpendicular to each other.

[0049] The first end of the first cooling column 1 is rotatably connected to the connecting unit 51, and the second end is movably mounted on the transverse guide rail 3; the first end of the second cooling column 2 is rotatably connected to the connecting unit 51, and the second end is movably mounted on the transverse guide rail 3; the connecting unit 51 is movably disposed on the longitudinal guide rail 5; the louver 4 is provided between the second end of the first cooling column 1 and the second end of the second cooling column 2.

[0050] See Figure 1 and Figure 2The first cooling column 1, the second cooling column 2, and the louver 4 form a cooling triangle structure, with the louver 4 located in the air channel of the cooling triangle structure. By moving and changing the position of the second end of the first cooling column 1 on the transverse guide rail 3 and the position of the second end of the second cooling column 2 on the transverse guide rail 3, while simultaneously changing the position of the connecting unit 51 on the longitudinal guide rail 1, the top angle between the first end of the first cooling column 1 and the first end of the second cooling column 2 can be changed. This allows for full utilization of the side air intake from different directions at the bottom of the indirect cooling tower body 11. In other words, the top angle of the cooling triangle structure can be changed through the cooperation of the first cooling column 1, the second cooling column 2, the transverse guide rail 3, the connecting unit 51, and the longitudinal guide rail 5.

[0051] See Figure 3 and Figure 4 Both the first cooling column 1 and the second cooling column 2 have a circulating water supply unit 61 and a circulating water return unit 62. The circulating water return unit 62 has a vertically distributed return water pipe bundle 72 inside. Circulating water is drawn out sequentially through the circulating water supply unit 61 and the return water pipe bundle 72 of the circulating water return unit 62. The return water pipe bundle 72 has multiple intermediate water collection tanks 8 spaced apart from top to bottom. By selecting a specific intermediate water collection tank 8 as the extraction endpoint, the extraction process of the circulating water return unit 62 is determined, thereby indirectly changing and controlling the heat exchange area and heat exchange time of the circulating water in the radiator. The return water pipe bundle 72 includes multiple parallel return water pipes.

[0052] In this embodiment of the application, by changing the top angle between the first end of the first cooling column 1 and the first end of the second cooling column 2, the air intake of the first cooling column 1 and the second cooling column 2 on both sides of the cooling triangle structure is indirectly changed.

[0053] Furthermore, by selecting different intermediate water collection tanks 8 as extraction endpoints, the extraction process of the circulating water return unit 62 is determined, thereby changing the heat exchange process and heat exchange time of the circulating water inside the cooling triangle structure.

[0054] Therefore, under summer operating conditions and normal operating conditions, the indirect cooling tower cooling structure and operation strategy provided in this application can improve the heat exchange capacity of the indirect air-cooled radiator, reduce the adverse effects of ambient crosswinds on the indirect air-cooled radiator, and minimize the outlet temperature of the circulating water in the indirect cooling tower.

[0055] In winter operation, it can minimize the outlet temperature of the cooling tower circulating water while preventing freezing.

[0056] In this embodiment, the deflection of the airflow through the first and second cooling columns, the inlet and outlet airflow state and resistance are changed by altering the size of the included angle at the top of the cooling triangle structure, thereby adjusting the heat exchange capacity of the radiator and reducing the adverse effects of ambient crosswinds on the radiator. By opening the extraction process of different sections on the return water side of the circulating water, the heat exchange area and heat exchange time of the circulating water in the cooling triangle structure are indirectly changed and controlled, thus achieving the purpose of winter antifreeze of the cooling triangle structure.

[0057] For example, the interior of the circulating water supply unit 61 is provided with a water supply pipe bundle 71 distributed in the vertical direction.

[0058] Optionally, see Figure 5 and Figure 6 The cooling structure of the indirect cooling tower also includes the indirect cooling tower body 11, the inner ring cooling column 13 and the circulating water pump 14;

[0059] The bottom periphery of the indirect cooling tower body 11 is uniformly arranged with multiple cooling triangular structures with variable top angles, forming an outer ring 12. An inner ring cooling column 13 is provided inside the bottom of the indirect cooling tower body 11. The inner ring cooling column 13 is arranged inside the tower with the circulating water supply unit side close to the outer ring and the circulating water return unit side close to the indirect cooling tower body. The circulating water pump 14 is provided on the connecting pipe between the outer ring 12 and the inner ring cooling column 13.

[0060] In the above embodiments, under summer operating conditions, the circulating water of the indirect cooling tower first passes through the inner ring cooling column 13 arranged inside the tower bottom and is then sent by the circulating water pump 14 to the cooling triangular structure outside the tower bottom, thereby improving the heat exchange capacity of the indirect cooling tower, reducing the adverse effects of ambient crosswinds on the indirect air-cooled radiator, and minimizing the outlet temperature of the circulating water of the indirect cooling tower.

[0061] Optionally, the cooling structure of the indirect cooling tower also includes an extraction water pipe 10 and a regulating valve 9;

[0062] Each of the intermediate water collection tanks 8 is connected to a water extraction pipe 10, and each of the water extraction pipes 10 is equipped with a regulating valve 9.

[0063] In the above embodiment, the flow rate of the extraction water pipe 10 can be controlled by the regulating valve 9, and the return water process of the circulating water return unit 62 can be controlled, making the operation simple.

[0064] For example, the form of the regulating valve 9 includes, but is not limited to, butterfly valves and throttle valves; the control execution method of the regulating valve 9 includes, but is not limited to, electric, pneumatic or manual.

[0065] Optionally, the included angle at the top ranges from 60° to 150°. This allows for a wider range of included angles at the top of the cooling triangle structure, thereby enabling greater adjustment of the airflow into the first cooling column 1 and the second cooling column 2 on both sides of the cooling triangle structure.

[0066] Optionally, the extraction process is k, and the number of processes is n;

[0067] Then k = 1 to n, 1 ≤ n ≤ 6; where the serial numbers are arranged from bottom to top;

[0068] In the above implementation, the number of processes is designed reasonably, and the corresponding extraction process can be selected as needed, making the operation simple.

[0069] Furthermore, by activating the extraction process k of different sections of the circulating water return unit 62 in the first cooling column 1 and / or the second cooling column 2 under different operating conditions, the heat exchange area and heat exchange time of the circulating water in the indirect air-cooled radiator can be indirectly changed and controlled.

[0070] Optionally, a temperature sensor is installed on the inner wall of the upstream return water pipe bundle 72 connected to each of the intermediate water collection tanks 8. The temperature sensor can monitor the wall temperature of the return water pipe bundle 72 on the upstream side of the circulating water flow direction of each intermediate water collection tank 8 in real time, and determine whether there is a risk of pipe bundle freezing and cracking in the corresponding flow section by measuring the temperature at the pipe wall temperature measuring point.

[0071] Optionally, the inner ring cooling columns 13 are arranged between adjacent cooling triangular structures;

[0072] The inner ring cooling column 13 has a circulating water supply unit 61 and a circulating water return unit 62. The circulating water return unit 62 is provided with a return water pipe bundle 72 distributed vertically inside. Circulating water is drawn out by passing through the circulating water supply unit 61 and the return water pipe bundle 72 of the circulating water return unit 62 in sequence. The return water pipe bundle 72 is provided with multiple intermediate water collection tanks 8 at intervals from top to bottom. By selecting a certain intermediate water collection tank 8 as the extraction endpoint, the return water flow of the circulating water return unit 62 is determined.

[0073] In the above embodiments, the inner ring cooling column 13 has a reasonable structural design, and the return water flow of the circulating water return unit 62 of the inner ring cooling column 13 can be changed as needed.

[0074] Optionally, the inner ring cooling column 13 is arranged in a ring with the bottom center of the indirect cooling tower body 11 as the center, and the inner ring diameter is not less than 85% of the bottom diameter of the indirect cooling tower body 11.

[0075] In the above embodiments, it is possible to fully utilize the air intake between the adjacent cooling triangular structures on the outer periphery of the base of the indirect cooling tower body 11 and avoid affecting the airflow state inside the indirect cooling tower.

[0076] Optionally, the outer ring 12 and the inner ring cooling column 13 can operate independently.

[0077] Alternatively, the outer ring 12 and the inner ring cooling column 13 can be connected in series via the circulating water pump 14. This means either the outer ring 12 can be connected to the inner ring cooling column 13 via the circulating water pump 14, or the inner ring cooling column 13 can be connected to the outer ring 12 via the circulating water pump 14. This allows the circulation mode of the circulating water to be adjusted according to actual working conditions, simplifying operation.

[0078] In one specific embodiment, the water supply tube bundle 71 and the water return tube bundle 72 in the first cooling column 1 and / or the second cooling column 2 and / or the inner ring cooling column 13 include, but are not limited to, square finned tubes and spiral finned tubes; the tube bundles of the water supply tube bundle 71 and the water return tube bundle 72 are arranged in a forked manner; the tube bundle materials of the water supply tube bundle 71 and the water return tube bundle 72 include, but are not limited to, carbon steel, stainless steel, copper or aluminum.

[0079] For example, the circulating water pump 14 may be in the form of, but is not limited to, a vertical mixed-flow pump, a vertical centrifugal pump, or a horizontal centrifugal pump, and the valves on the pipeline may be in the form of, but are not limited to, butterfly valves or throttle valves.

[0080] According to a second aspect of the present invention, an operating strategy for an indirect cooling tower structure is provided, namely, an operating method for an indirect cooling tower structure, applied to the indirect cooling tower structure as described in the first aspect, comprising:

[0081] Under normal operating conditions, with all 4 louvers in the air duct fully open and crosswinds present, when the outlet temperature of the cooling tower circulating water is 1-6°C higher than the design temperature, the system is adjusted by gradually increasing the top angle of the cooling triangle structure in the crosswind inlet section; for every 1°C the outlet temperature of the cooling tower circulating water is higher than the design temperature, the top angle of the cooling triangle structure is increased by 30°.

[0082] In summer operation, with the louvers 4 in the air channel fully open, the included angle of the top of all the cooling triangular structures around the bottom of the indirect cooling tower body 11 is increased to 150°. When the outlet temperature of the indirect cooling tower circulating water is 10° or more higher than the design temperature, the circulating water pump 14 is turned on. The circulating water of the indirect cooling tower first passes through the inner ring cooling column 13 arranged inside the bottom of the tower and then is sent by the circulating water pump 14 to the outer ring cooling triangular structure around the bottom of the tower.

[0083] In winter operation, with all louvers 4 in the air channel closed, the included angle of the top of all cooling triangular structures around the bottom of the indirect cooling tower body 11 is reduced to 60°. The temperature data of the return water pipe bundle 72 corresponding to the intermediate water collection tank 8 is monitored by various temperature sensors. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of the extraction process k is 0°C, the extraction process k+1 is started. It should be noted that n is the number of the uppermost extraction process. And the lower extraction process is started first during the control, the same below.

[0084] Under extreme climatic conditions, when the lowest temperature among the temperature measuring points on the pipe walls of all return water pipes upstream of the extraction process n of more than 50% of the outer ring cooling triangle structure is 0℃, the circulating water pump 14 is activated to pump the circulating water in the outer ring cooling triangle structure to the inner ring cooling column 13 section, and only the inner ring cooling column 13 section arranged inside the tower bottom is used for circulating water cooling.

[0085] Specifically, for the inner ring cooling column 13, the temperature data of the return water pipe bundle 72 corresponding to the intermediate water collection tank 8 is monitored by various temperature sensors. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of the extraction process k is 0℃, the extraction process k+1 is started. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of the extraction process n of more than 50% of the inner ring cooling columns 13 is 0℃, the circulating water inlet is shut off and the indirect cooling tower is taken out of operation.

[0086] In the above embodiments, the operation strategy of the indirect air-cooled tower cooling structure is reasonably designed. It can adjust the size of the apex angle of the cooling triangle structure, the extraction process of the return water pipe bundle 72 of the first cooling column 1 and the second cooling column 2, and the circulation mode of the circulating water according to specific operating conditions. The operation is simple. Under summer and normal operating conditions, it can improve the heat exchange capacity of the indirect air-cooled radiator, reduce the adverse effects of ambient crosswinds on the indirect air-cooled radiator, and minimize the outlet temperature of the circulating water in the indirect air-cooled tower. Under winter operating conditions, it can minimize the outlet temperature of the circulating water in the indirect air-cooled tower while preventing freezing. Under extreme climatic conditions, it can better ensure the safety and stability of the operation of the indirect air-cooled tower.

[0087] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A cooling tower structure, characterized in that, It includes a first cooling column, a second cooling column, a transverse guide rail, louvers, a connecting unit, and a longitudinal guide rail; The first end of the first cooling column is rotatably connected to the connecting unit, and the second end is movably mounted on the transverse guide rail; the first end of the second cooling column is rotatably connected to the connecting unit, and the second end is movably mounted on the transverse guide rail; the connecting unit is movably disposed on the longitudinal guide rail; a louver is provided between the second end of the first cooling column and the second end of the second cooling column. The first cooling column, the second cooling column, and the louver form a cooling triangle structure, and the louver is located in the air channel of the cooling triangle structure; by moving and changing the position of the second end of the first cooling column on the horizontal guide rail and moving and changing the position of the second end of the second cooling column on the horizontal guide rail, the position of the connecting unit is changed, thereby changing the top angle between the first end of the first cooling column and the first end of the second cooling column. Both the first and second cooling columns have a circulating water supply unit and a circulating water return unit. The circulating water return unit has a vertically distributed return water pipe bundle inside. Circulating water is sequentially drawn out through the circulating water supply unit and the return water pipe bundle of the circulating water return unit. The return water pipe bundle is provided with multiple intermediate water collection tanks at intervals from top to bottom. By selecting a certain intermediate water collection tank as the extraction endpoint, the extraction process of the circulating water return unit is determined. The extraction process is k, and the number of processes is n; then k = 1~n, 1≤n≤6. It also includes the indirect cooling tower body, the inner ring cooling column, and the circulating water pump; Multiple cooling triangular structures are uniformly arranged in a ring around the bottom of the indirect cooling tower body, and the multiple cooling triangular structures form an outer ring; an inner ring cooling column is provided inside the bottom of the indirect cooling tower body, and the inner ring cooling column is arranged inside the tower with the circulating water supply unit side close to the outer ring and the circulating water return unit side close to the indirect cooling tower body; the circulating water pump is provided on the connecting pipe between the outer ring and the inner ring cooling column. It also includes a drain pipe and a regulating valve; Each of the intermediate water collection tanks is connected to a water extraction pipe, and each of the water extraction pipes is equipped with a regulating valve; A temperature sensor is installed on the inner wall of the upstream return water pipe bundle connected to each of the intermediate water collection tanks.

2. The indirect cooling tower structure according to claim 1, characterized in that, The range of the included angle at the top is 60° to 150°.

3. The indirect cooling tower structure according to claim 2, characterized in that, The inner ring cooling columns are arranged between adjacent cooling triangular structures; The inner ring cooling column has a circulating water supply unit and a circulating water return unit. The circulating water return unit is equipped with a return water pipe bundle distributed vertically. Circulating water is drawn out by sequentially passing through the circulating water supply unit and the return water pipe bundle of the circulating water return unit. The return water pipe bundle is provided with multiple intermediate water collection tanks at intervals from top to bottom. By selecting a certain intermediate water collection tank as the extraction endpoint, the return water flow of the circulating water return unit is determined.

4. The indirect cooling tower structure according to claim 3, characterized in that, The inner ring cooling column is arranged in a ring shape with the bottom center of the indirect cooling tower body as the center, and the diameter of the inner ring is not less than 85% of the bottom diameter of the indirect cooling tower body.

5. The indirect cooling tower structure according to claim 4, characterized in that, The outer ring and the inner ring cooling columns can operate independently. Alternatively, the outer ring and the inner ring cooling column can be connected in series via the circulating water pump.

6. An operation strategy for an indirect cooling tower structure, characterized in that, Applied to the indirect cooling tower structure as described in claim 5, comprising: Under normal operating conditions, with the louvers in the air duct fully open and crosswinds present, when the outlet temperature of the cooling tower circulating water is 1-6°C higher than the design temperature, the system is adjusted by gradually increasing the top angle of the cooling triangle structure in the crosswind inlet section; for every 1°C the outlet temperature of the cooling tower circulating water is higher than the design temperature, the top angle of the cooling triangle structure is increased by 30°. In summer operation, with all the louvers in the air channel fully open, the included angle of the top of all the cooling triangular structures around the bottom of the indirect cooling tower body is increased to 150°. When the outlet temperature of the circulating water of the indirect cooling tower is 10° or more higher than the design temperature, the circulating water pump is turned on. The circulating water of the indirect cooling tower first passes through the inner ring cooling column arranged inside the bottom of the tower and then is pumped to the outer ring cooling triangular structure around the bottom of the tower. In winter operation, with all louvers in the air channel closed, the included angle of the top of all cooling triangular structures on the outer periphery of the base of the indirect cooling tower is reduced to 60°. Temperature data of the return water pipe bundle corresponding to the intermediate water collection tank is monitored by various temperature sensors. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of extraction process k is 0°C, extraction process k+1 is started. Under extreme climatic conditions, when the lowest temperature among all the temperature measuring points on the pipe walls of the return water pipes upstream of the extraction process n of more than 50% of the outer ring cooling triangle structure is 0℃, the circulating water pump is activated to pump the circulating water in the outer ring cooling triangle structure to the inner ring cooling column section, and only the inner ring cooling column section arranged inside the tower bottom is used for circulating water cooling. Specifically, for the inner ring cooling column, the temperature data of the return water pipe bundle corresponding to the intermediate water collection tank is monitored by various temperature sensors. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of extraction process k is 0℃, extraction process k+1 is started. When the lowest temperature among the temperature measuring points of all return water pipe walls upstream of extraction process n for more than 50% of the inner ring cooling columns is 0℃, the circulating water inlet is shut off and the indirect cooling tower is taken out of operation.

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