A water spraying method for a cooling tower

Abstract

The application relates to the field of heat supply, flexibility and safe operation of a thermal power plant, in particular to a water spraying method for a cooling tower. The method comprises the following steps: acquiring real-time environment temperature data and real-time circulating water temperature data, selecting a first working mode or a second working mode according to the real-time environment temperature data and the real-time circulating water temperature data, when the first working mode is selected, closing a bypass spraying system and setting working parameters of a spraying system, and when the second working mode is selected, opening the bypass spraying system and setting working parameters of the bypass spraying system according to the real-time environment temperature and the real-time circulating water temperature. The method can meet the safe operation requirements of heat supply and pure condensation working conditions. After a cylinder of a unit is cut, the bypass spraying system can be put into operation to meet the cooling water requirement of the unit, so that the water temperature of a circulating water pool of the cooling tower is not lower than 0 DEG C and the circulating water temperature is not higher than 30 DEG C. The method improves the economic efficiency and safety of unit operation and solves the problem of ice formation of circulating water in the cooling tower in winter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat supply, flexibility and safe operation of thermal power plants, and in particular to a water spraying method for a cooling tower. BACKGROUND

[0002] The cooling tower is an evaporative heat dissipation device that uses water and air flow contact to exchange heat and generate steam, and the steam volatilization removes heat to achieve evaporation heat dissipation, convection heat transfer and radiation heat transfer principles to dissipate the waste heat generated in industry or refrigeration air conditioning to reduce water temperature.

[0003] The circulating backwater after heat exchange in the condenser enters the water spraying layer of the cooling tower through the central pipeline of the cooling tower, and the circulating water is divided into countless streams by the filler of the cooling tower and falls from the air in a countercurrent convection manner, and the flowing air cools the circulating water.

[0004] At present, there are safety hazards in the circulating water icing of the cooling tower unit during cylinder cut-off operation in extremely cold weather: 1. The circulating water temperature of the cooling tower is too low, which is prone to icing and forms ice on the cooling tower, and a large amount of ice causes the support of the cooling tower filler to be overloaded, which may cause the filler to fall off in a large area. 2. The circulating water temperature is too low, and ice is formed in the cooling tower pool. In the most serious case, the ice nucleus of the circulating water is in a porridge-like state, which blocks the inlet of the circulating water pump, the outlet flow of the circulating pump is low, and the circulating pump has excessive current. 3. A large amount of ice is accumulated in the cooling tower, and the ice is easy to fall off and damage the equipment and cause personal injury. SUMMARY

[0005] The purpose of the present application is to solve the above technical problems, and the present application provides a water spraying method for a cooling tower, which ensures that the cooling tower does not ice on the filler and protects the filler layer from falling off due to icing.

[0006] In some embodiments of the present application, the heat exchange capacity of the cooling tower is adjusted by adjusting the bypass spraying electric control valve, the bypass spraying height is adjusted by adjusting the bypass spraying electric control valve, the heat exchange capacity is changed, and the circulating water temperature is effectively ensured. At the same time, the bypass spraying electric control valve also plays a role of draining the spraying pipeline. When the bypass spraying is not put into operation, the bypass spraying electric control valve is opened to drain the pipeline, which prevents the pipeline from being damaged by ice accumulation.

[0007] In some embodiments of the present application, the bypass spraying system is started when the unit is operated in cylinder cut-off mode, and the circulating water does not go up the tower at this time. The cooling tower pool is cooled and dispersed by the modified bypass spraying system, and the circulating water temperature in the cooling tower pool is maintained between 0 and 30 degrees.

[0008] In some embodiments of the present application, the bypass spraying system is started when the unit is operated in cylinder cut-off mode, and the circulating water does not go up the tower at this time. The cooling tower pool is cooled and dispersed by the modified bypass spraying system, and the circulating water temperature in the cooling tower pool is maintained between 0 and 30 degrees.

[0009] In some embodiments of the present application, a water spraying method for a cooling tower is provided, comprising:

[0010] Step 1: obtaining real-time ambient temperature data and real-time circulating water temperature data, and selecting a first working mode or a second working mode according to the real-time ambient temperature data and the real-time circulating water temperature data;

[0011] Step 2: when the first working mode is selected, closing a bypass spraying system, and setting working parameters of a spraying system,

[0012] Step 3: when the second working mode is selected, opening the bypass spraying system, and setting working parameters of the bypass spraying system according to real-time ambient temperature and real-time circulating water temperature;

[0013] In Step 1, preset ambient temperature threshold and circulating water temperature threshold are provided, and when the real-time ambient temperature data is less than the preset ambient temperature threshold or the real-time circulating water temperature is less than the circulating water temperature threshold, the second working mode is selected.

[0014] In some embodiments of the present application, Step 3 comprises:

[0015] obtaining real-time circulating water temperature data a, and setting real-time spraying height of the bypass spraying system according to a relationship between a preset circulating water temperature matrix A and a preset spraying height matrix B of the bypass spraying system.

[0016] In some embodiments of the present application, when the real-time spraying height of the bypass spraying system is set, it comprises:

[0017] the preset circulating water temperature matrix A is set as A (A1, A2, A3, A4), wherein A1 is a first preset circulating water temperature, A2 is a second preset circulating water temperature, A3 is a third preset circulating water temperature, and A4 is a fourth preset circulating water temperature, and A1

[0018] the preset spraying height matrix B of the bypass spraying system is set as B (B1, B2, B3, B4), wherein B1 is a first preset spraying height of the bypass spraying system, B2 is a second preset spraying height of the bypass spraying system, B3 is a third preset spraying height of the bypass spraying system, and B4 is a fourth preset spraying height of the bypass spraying system, and B1

[0019] when a

[0020] when A1

[0021] When A2

[0022] When A3

[0023] In some embodiments of the present application, the method further comprises:

[0024] acquiring real-time ambient temperature data, and selecting a correction coefficient according to the real-time ambient temperature data to correct the set real-time bypass spraying system spraying height b.

[0025] In some embodiments of the present application, when the set real-time bypass spraying system spraying height b is corrected, the method comprises:

[0026] setting a preset ambient temperature matrix C, and setting C(C1, C2, C3, C4), wherein C1 is a first preset ambient temperature value, C2 is a second preset ambient temperature value, C3 is a third preset ambient temperature value, and C4 is a fourth preset ambient temperature value, and C1

[0027] setting a first preset correction coefficient d1, a second preset correction coefficient d2, a third preset correction coefficient d3, and a fourth preset correction coefficient d4, and 0.8

[0028] acquiring real-time ambient temperature c, and setting a real-time correction coefficient d according to the relationship between the preset ambient temperature matrix C and the preset correction coefficient matrix d;

[0029] When c

[0030] When C1

[0031] When C2

[0032] When C3

[0033] In some embodiments of the present application, the step three further comprises:

[0034] a preset post-spraying circulating water temperature threshold value, obtaining real-time post-spraying circulating water temperature data, and setting a real-time cooling water tower air exchange rate according to the real-time post-spraying circulating water temperature when the real-time post-spraying circulating water temperature is less than the preset post-spraying circulating water temperature threshold value.

[0035] In some embodiments of the present application, the setting of the real-time cooling water tower air exchange rate comprises:

[0036] a preset post-spraying circulating water temperature matrix G is set as G (G1, G2, G3, G4), wherein G1 is a first preset post-spraying circulating water temperature, G2 is a second preset post-spraying circulating water temperature, G3 is a third preset post-spraying circulating water temperature, and G4 is a fourth preset post-spraying circulating water temperature, and G1 < G2 < G3 < G4;

[0037] a preset air exchange rate matrix V is set as V (V1, V2, V3, V4), wherein V1 is a first preset air exchange rate, V2 is a second preset air exchange rate, V3 is a third preset air exchange rate, and V4 is a fourth preset air exchange rate, and V1 < V2 < V3 < V4;

[0038] The real-time cooling water tower air exchange rate v is set according to the real-time post-spraying circulating water temperature g, and specifically:

[0039] when G1 < g < G2, the first preset air exchange rate V1 is set as the real-time cooling water tower air exchange rate v, i.e., v = V1;

[0040] when G2 < g < G3, the second preset air exchange rate V2 is set as the real-time cooling water tower air exchange rate v, i.e., v = V2;

[0041] when G3 < g < G4, the third preset air exchange rate V3 is set as the real-time cooling water tower air exchange rate v, i.e., v = V3;

[0042] when g > G4, the fourth preset air exchange rate V4 is set as the real-time cooling water tower air exchange rate v, i.e., v = V4.

[0043] In some embodiments of the present application, the step two comprises:

[0044] when the real-time environment temperature data is greater than the preset environment temperature threshold value and the real-time circulating water temperature is greater than the preset circulating water temperature threshold value, a first-level working mode is selected.

[0045] In some embodiments of the present application, the step two further comprises:

[0046] real-time circulating water temperature e is obtained, and a real-time spraying system spraying speed f is set according to the relationship between a preset circulating water temperature matrix E and a preset spraying system spraying speed matrix F.

[0047] In some embodiments of the present application, when setting the real-time spraying speed f of the water spraying system, the following steps are included:

[0048] A preset circulating water temperature matrix E is set as E (E1, E2, E3, E4), wherein E1 is a first preset circulating water temperature, E2 is a second preset circulating water temperature, E3 is a third preset circulating water temperature, E4 is a fourth preset circulating water temperature, and E1

[0049] A preset water spraying system spraying speed matrix F is set as F (F1, F2, F3, F4), wherein F2 is a second preset water spraying system spraying speed, F3 is a third preset water spraying system spraying speed, F4 is a fourth preset water spraying system spraying speed, and F1

[0050] A real-time circulating water temperature e is obtained, and the real-time water spraying system spraying speed f is set according to the relationship between the preset circulating water temperature matrix E and the preset water spraying system spraying speed matrix F, which specifically includes the following steps:

[0051] When e

[0052] When E1

[0053] When E2

[0054] When E13

[0055] Compared with the prior art, the water spraying method of the cooling tower according to the embodiments of the present application has the following beneficial effects:

[0056] The safe operation requirements of the heating and pure condensing conditions can be met. After the cylinder of the unit is cut, the bypass spraying operation can meet the needs of the cooling water of the unit, and ensure that the water temperature of the circulating water pool of the cooling tower is not lower than 0 degrees and the circulating water temperature is not higher than 30 degrees.

[0057] The economic efficiency and safety of the unit operation are improved, the problem of ice formation of the circulating water in the cooling tower in winter is solved, the flexible switching requirements of the circulating water system in the heating season and the pure condensing condition in summer are met, and the circulating water is not sprayed on the water spraying layer of the cooling tower, so that the cooling tower is not frozen on the filler, and the filler is protected from falling off due to ice formation. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1is a flowchart of a water spraying method of a cooling tower in preferred embodiments of the present application;

[0059] Figure 2 is a logic diagram of a water spraying method of a cooling tower in preferred embodiments of the present application. DETAILED DESCRIPTION

[0060] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0061] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0062] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0063] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] As shown in Figure 1 and Figure 2 A water spraying method of a cooling tower in preferred embodiments of the present application comprises:

[0065] Step one: obtaining real-time ambient temperature data and real-time circulating water temperature data, and selecting a first working mode or a second working mode according to the real-time ambient temperature data and the real-time circulating water temperature data;

[0066] Step two: when the first working mode is selected, the bypass spraying system is closed, and the water spraying system working parameters are set,

[0067] Step three: when the selected secondary working mode, open the bypass spray system, and according to the real-time environmental temperature and real-time circulating water temperature set the bypass spray system working parameters;

[0068] In step one, the preset environmental temperature threshold and circulating water temperature threshold, when the real-time environmental temperature data is less than the preset environmental temperature threshold or the real-time circulating water temperature is less than the circulating water temperature threshold, the secondary working mode is selected.

[0069] Specifically, the preset environmental temperature threshold is preferably 0 degrees Celsius, and the preset circulating water temperature threshold is preferably 12 degrees Celsius.

[0070] Specifically, in the primary working mode, the circulating water after heat exchange by the condenser is returned to the cooling tower through the central pipe of the cooling tower, and the circulating water is divided into countless streams by the cooling tower filler and falls from the air in a reverse convection manner. The flowing air cools the circulating water. At this time, the cooling tower has the strongest heat exchange capacity.

[0071] Specifically, in the secondary working mode, the circulating water enters the spray pipe and forms a fountain mode from bottom to top under the action of circulating water pressure, and exchanges heat with the air to reduce the circulating water temperature. This form of heat exchange has poor capacity, which can effectively ensure the circulating water temperature, and at the same time, the circulating water does not enter the cooling tower water layer, which ensures that the cooling tower does not freeze on the filler and protects the filler from falling off due to excessive ice.

[0072] Specifically, the bypass spray system modification mode is to extend the bypass pipe to the center of the cooling tower and connect the cross-shaped bypass spray head system. The bypass main pipe adopts DN1600 pipe, the bypass spray head system main pipe adopts DN400 pipe, and the spray pipe is installed on the pipe. The pipe diameter of the small spray head is Φ20, and the size and number of the spray head are determined after balanced calculation according to the circulating water flow and pressure to ensure that the circulating water is sprayed in the form of a fountain in the spray head. The circulating water exchanges heat in the air to reduce the circulating water temperature, cools the circulating water after the turbine cylinder is cut, and ensures that the circulating water temperature is between 0 degrees and 30 degrees.

[0073] Specifically, step three includes:

[0074] Obtain real-time circulating water temperature data a, and set the real-time bypass spray system spray height according to the relationship between the preset circulating water temperature matrix A and the preset bypass spray system spray height matrix B.

[0075] Specifically, when setting the real-time bypass spray system spray height, it includes:

[0076] A preset circulating water temperature matrix A is set, and A (A1, A2, A3, A4) is set, wherein A1 is a first preset circulating water temperature, A2 is a second preset circulating water temperature, A3 is a third preset circulating water temperature, and A4 is a fourth preset circulating water temperature, and A1

[0077] A preset bypass spraying system spraying height matrix B is set, and B (B1, B2, B3, B4) is set, wherein B1 is a first preset bypass spraying system spraying height, B2 is a second preset bypass spraying system spraying height, B3 is a third preset bypass spraying system spraying height, and B4 is a fourth preset bypass spraying system spraying height, and B1

[0078] When a

[0079] When A1

[0080] When A2

[0081] When A3

[0082] It can be understood that, in the above embodiment, by means of the preset circulating water temperature matrix and the preset bypass spraying system spraying height matrix, the bypass spraying height is adjusted by changing the opening degree of the regulating valve, the bypass spraying height is adjusted by adjusting the bypass spraying height, the heat exchange capacity is changed, and the circulating water temperature is effectively ensured to be between 0 degrees and 30 degrees. At the same time, the circulating water does not spray on the water spraying layer of the cooling tower, so that the cooling tower is prevented from being frozen on the filler, and the filler is prevented from being too heavy and falling off due to freezing

[0083] In the preferred embodiment of the present application, when the bypass spraying system spraying height is set, the method further comprises:

[0084] Real-time ambient temperature data is obtained, and a correction coefficient is selected according to the real-time ambient temperature data to correct the set real-time bypass spraying system spraying height b.

[0085] Specifically, when the set real-time bypass spraying system spraying height b is corrected, the method comprises:

[0086] A preset ambient temperature matrix C is set, and C(C1, C2, C3, C4) is set, wherein C1 is a first preset ambient temperature value, C2 is a second preset ambient temperature value, C3 is a third preset ambient temperature value, and C4 is a fourth preset ambient temperature value, and C1 < C2 < C3 < C4;

[0087] A first preset correction coefficient d1, a second preset correction coefficient d2, a third preset correction coefficient d3, and a fourth preset correction coefficient d4 are set, and 0.8 < d1 < d2 < d3 < d4 < 1;

[0088] A real-time ambient temperature c is obtained, and a real-time correction coefficient d is set according to a relationship between the preset ambient temperature matrix C and the preset correction coefficient matrix d;

[0089] When c < C1, the first preset correction coefficient d1 is set as the real-time correction coefficient, and a corrected bypass spraying system spraying height b = d1 * Bi;

[0090] When C1 < c < C2, the second preset correction coefficient d2 is set as the real-time correction coefficient, and the corrected bypass spraying system spraying height b = d2 * Bi;

[0091] When C2 < c < C3, the third preset correction coefficient d3 is set as the real-time correction coefficient, and the corrected bypass spraying system spraying height b = d3 * Bi;

[0092] When C3 < c < C4, the fourth preset correction coefficient d4 is set as the real-time correction coefficient, and the corrected bypass spraying system spraying height b = d4 * Bi.

[0093] It can be understood that in the above embodiment, by collecting real-time ambient temperature data of the cooling tower in the secondary working mode, the bypass spraying system spraying height is adjusted in time to ensure the heat exchange efficiency, and the icing phenomenon caused by the low water temperature is avoided.

[0094] In the preferred embodiment of the present application, step three further comprises:

[0095] A preset post-spraying circulating water temperature threshold is set, real-time post-spraying circulating water temperature data is obtained, and when the real-time post-spraying circulating water temperature is less than the preset post-spraying circulating water temperature threshold, a real-time cooling tower air exchange speed is set according to the real-time post-spraying circulating water temperature.

[0096] Specifically, the post-spraying circulating water temperature threshold is generated by historical operation data, and when the real-time temperature of the post-spraying circulating water is higher than the threshold, icing problem does not occur. Otherwise, icing is likely to occur.

[0097] Specifically, when the real-time cooling tower air exchange speed is set, it includes:

[0098] A preset spray post-circulating water temperature matrix G is set as G (G1, G2, G33, G4), wherein G1 is a first preset spray post-circulating water temperature, G2 is a second preset spray post-circulating water temperature, G3 is a third preset spray post-circulating water temperature, and G4 is a fourth preset spray post-circulating water temperature, and G1 < G2 < G3 < G4;

[0099] A preset ventilation speed matrix V is set as V (V1, V2, V3, V4), wherein V1 is a first preset ventilation speed, V2 is a second preset ventilation speed, V3 is a third preset ventilation speed, and V4 is a fourth preset ventilation speed, and V1 < V2 < V3 < V4;

[0100] The real-time cooling water tower ventilation speed v is set according to the real-time spray post-circulating water temperature g, and specifically:

[0101] When G1 < g < G2, the first preset ventilation speed V1 is set as the real-time cooling water tower ventilation speed v, that is, v = V1;

[0102] When G2 < g < G3, the second preset ventilation speed V2 is set as the real-time cooling water tower ventilation speed v, that is, v = V2;

[0103] When G3 < g < G4, the third preset ventilation speed V3 is set as the real-time cooling water tower ventilation speed v, that is, v = V3;

[0104] When g > G4, the fourth preset ventilation speed V4 is set as the real-time cooling water tower ventilation speed v, that is, v = V4.

[0105] It can be understood that in the above embodiment, by presetting the spray post-circulating water temperature threshold, when the threshold is lower than the threshold, the ventilation speed is adjusted in time, and the heat exchange efficiency of the circulating water is reduced. This form of heat exchange capacity is poor, which can effectively ensure the circulating water temperature.

[0106] In the preferred embodiment of the present application, step two includes:

[0107] When the real-time environment temperature data is greater than the preset environment temperature threshold and the real-time circulating water temperature is greater than the circulating water temperature threshold, the first level working mode is selected.

[0108] The real-time circulating water temperature e is obtained, and the real-time water spraying system spraying speed f is set according to the relationship between the preset circulating water temperature matrix E and the preset water spraying system spraying speed matrix F.

[0109] Specifically, when the real-time water spraying system spraying speed f is set, it includes:

[0110] A preset circulating water temperature matrix E is set as E (E1, E2, E3, E4), wherein E1 is a first preset circulating water temperature, E2 is a second preset circulating water temperature, E3 is a third preset circulating water temperature, and E4 is a fourth preset circulating water temperature, and E1 < E2 < E3 < E4;

[0111] A preset spraying speed matrix F of the spraying system is set as F (F1, F2, F3, F4), wherein F2 is a second preset spraying speed of the spraying system, F3 is a third preset spraying speed of the spraying system, and F4 is a fourth preset spraying speed of the spraying system, and F1 < F2 < F3 < F4;

[0112] A real-time circulating water temperature e is obtained, and a real-time spraying speed f of the spraying system is set according to the relationship between the preset circulating water temperature matrix E and the preset spraying speed matrix F, and specifically:

[0113] When e < E1, the fourth preset spraying speed F4 of the spraying system is set as the real-time spraying speed f, that is, f = F4;

[0114] When E1 < e < E2, the third preset spraying speed F3 of the spraying system is set as the real-time spraying speed f, that is, f = F3;

[0115] When E2 < e < E3, the second preset spraying speed F2 of the spraying system is set as the real-time spraying speed f, that is, f = F2;

[0116] When E13 < e < E4, the first preset spraying speed F1 of the spraying system is set as the real-time spraying speed f, that is, f = F1.

[0117] Specifically, when the ambient temperature is greater than 0 degrees Celsius and the circulating water temperature is greater than 12 degrees Celsius, the first working mode is started.

[0118] Specifically, the temperature values in the preset circulating water temperature matrix E are all greater than the preset ambient temperature threshold, that is, greater than 0 degrees Celsius.

[0119] It can be understood that in the above embodiment, the cooling tower in the first working mode adjusts the spraying speed of the spraying system in time through the preset circulating water temperature matrix and the preset spraying speed matrix of the spraying system, and improves the heat exchange capacity of the cooling tower.

[0120] According to the first concept of the present application, by adjusting and changing the heat exchange capacity of the cooling tower, measures are taken to reduce the cooling efficiency of the cooling tower in winter to ensure the circulating water temperature, the cooling tower is transformed into a cooling pool, which is referred to as a bypass spraying system, and the circulating water is not sprayed on the spraying layer of the cooling tower.

[0121] According to the second concept of the application, by setting the bypass spray electric regulating valve, the bypass spray height is regulated by changing the regulating valve opening degree, the heat exchange capacity is changed, and the circulating water temperature can be effectively ensured. Meanwhile, the bypass spray electric regulating valve also plays a role of draining the spray pipeline. When the bypass spray is not in operation, the bypass spray electric regulating valve is opened to drain the pipeline, so as to prevent the pipeline from being damaged due to water accumulation and icing.

[0122] According to the third concept of the application, when the unit is in cylinder cutting operation, the air temperature and the circulating water temperature are comprehensively considered, the bypass spray system is opened, the circulating water does not go up the tower, the water in the cooling tower pool is sprayed and cooled through the modified bypass spray system, and the circulating water temperature in the cooling tower pool is maintained between 0 and 30 degrees.

[0123] The above is only the preferred embodiment of the application. It should be pointed out that, for ordinary skilled persons in the technical field, several improvements and replacements can be made without departing from the technical principles of the application, and these improvements and replacements should also be considered as the protection scope of the application.

Claims

1. A water spraying method for a cooling tower, characterized by, The application relates to a circulating water temperature control method and device. Step one: real-time environment temperature data and real-time circulating water temperature data are acquired, and a first-level working mode or a second-level working mode is selected according to the real-time environment temperature data and the real-time circulating water temperature data; Step two: when the first-level working mode is selected, a bypass spraying system is closed, and spraying system working parameters are set, Step three: when the second-level working mode is selected, the bypass spraying system is opened, and bypass spraying system working parameters are set according to real-time environment temperature and real-time circulating water temperature; In step one, preset environment temperature threshold values and circulating water temperature threshold values are set; When the real-time environment temperature data is less than the preset environment temperature threshold value or the real-time circulating water temperature is less than the circulating water temperature threshold value, the second-level working mode is selected; When the real-time environment temperature data is greater than the preset environment temperature threshold value and the real-time circulating water temperature is greater than the circulating water temperature threshold value, the first-level working mode is selected; The step three comprises the following steps: Real-time circulating water temperature data a is acquired, and real-time bypass spraying system spraying height b is set according to the relationship between a preset circulating water temperature matrix A and a preset bypass spraying system spraying height matrix B; Real-time environment temperature data is acquired, and a correction coefficient is selected according to the real-time environment temperature data, so that the set real-time bypass spraying system spraying height b is corrected; A preset post-spraying circulating water temperature threshold value is set, real-time post-spraying circulating water temperature data is acquired, and when the real-time post-spraying circulating water temperature is less than the preset post-spraying circulating water temperature threshold value, real-time cooling water tower ventilation speed is set according to the real-time post-spraying circulating water temperature.

2. The water spraying method for a cooling tower according to claim 1, wherein When the real-time bypass spraying system spraying height b is set, the following steps are included: A preset circulating water temperature matrix A is set as A (A1, A2, A3, A4), wherein A1 is a first preset circulating water temperature, A2 is a second preset circulating water temperature, A3 is a third preset circulating water temperature, and A4 is a fourth preset circulating water temperature, and A1 < A2 < A3 < A4; A preset bypass spraying system spraying height matrix B is set as B (B1, B2, B3, B4), wherein B1 is a first preset bypass spraying system spraying height, B2 is a second preset bypass spraying system spraying height, B3 is a third preset bypass spraying system spraying height, and B4 is a fourth preset bypass spraying system spraying height, and B1 < B2 < B3 < B4; When a < A1, the real-time bypass spraying system spraying height b is the first preset bypass spraying system spraying height B1, that is, b = B1 is set; When A1 < a < A2, the real-time bypass spraying system spraying height b is the second preset bypass spraying system spraying height B2, that is, b = B2 is set; When A2 < a < A3, the real-time bypass spraying system spraying height b is the third preset bypass spraying system spraying height B3, that is, b = B3 is set; When A3 < a < A4, the real-time bypass spraying system spraying height b is the fourth preset bypass spraying system spraying height B4, that is, b = B4 is set.

3. The water spraying method for a cooling tower as recited in claim 2, wherein When the set real-time bypass spraying system spraying height b is corrected, the following steps are included: A preset ambient temperature matrix C is set, and C (C1, C2, C3, C4) is set, wherein C1 is a first preset ambient temperature value, C2 is a second preset ambient temperature value, C3 is a third preset ambient temperature value, and C4 is a fourth preset ambient temperature value, and C1 < C2 < C3 < C4; A first preset correction coefficient d1, a second preset correction coefficient d2, a third preset correction coefficient d3, and a fourth preset correction coefficient d4 are set, and 0.8 < d1 < d2 < d3 < d4 < 1; A real-time ambient temperature c is obtained, and a real-time correction coefficient d is set according to a relationship between the preset ambient temperature matrix C and the preset correction coefficient matrix d; When c < C1, the first preset correction coefficient d1 is set as the real-time correction coefficient, and the corrected bypass spraying system spraying height b = d1 * Bi; When C1 < c < C2, the second preset correction coefficient d2 is set as the real-time correction coefficient, and the corrected bypass spraying system spraying height b = d2 * Bi; When C2 < c < C3, the third preset correction coefficient d3 is set as the real-time correction coefficient, and the corrected bypass spraying system spraying height b = d3 * Bi; When C3 < c < C4, the fourth preset correction coefficient d4 is set as the real-time correction coefficient, and the corrected bypass spraying system spraying height b = d4 * Bi.

4. The water spraying method for a cooling tower as claimed in claim 3, wherein When the real-time cooling tower ventilation speed is set, the following steps are included: A preset post-spraying circulating water temperature matrix G is set, and G (G1, G2, G33, G4) is set, wherein G1 is a first preset post-spraying circulating water temperature, G2 is a second preset post-spraying circulating water temperature, G3 is a third preset post-spraying circulating water temperature, and G4 is a fourth preset post-spraying circulating water temperature, and G1 < G2 < G3 < G4; A preset ventilation speed matrix V is set, and V (V1, V2, V3, V4) is set, wherein V1 is a first preset ventilation speed, V2 is a second preset ventilation speed, V3 is a third preset ventilation speed, and V4 is a fourth preset ventilation speed, and V1 < V2 < V3 < V4; The real-time cooling tower ventilation speed v is set according to the real-time post-spraying circulating water temperature g, and specifically: When G1 < g < G2, the first preset ventilation speed V1 is set as the real-time cooling tower ventilation speed v, that is, v = V1; When G2 < g < G3, the second preset ventilation speed V2 is set as the real-time cooling tower ventilation speed v, that is, v = V2; When G3 < g < G4, the third preset ventilation speed V3 is set as the real-time cooling tower ventilation speed v, that is, v = V3; When g > G4, the fourth preset ventilation speed V4 is set as the real-time cooling tower ventilation speed v, that is, v = V4.

5. The water spraying method for a water cooling tower according to claim 1, wherein The step two further includes: A real-time circulating water temperature e is obtained, and a real-time spraying speed f of the spraying system is set according to a relationship between a preset circulating water temperature matrix E and a preset spraying speed matrix F of the spraying system.

6. The water spraying method for a water cooling tower according to claim 5, wherein When the real-time spraying speed f of the spraying system is set, the following steps are included: A preset circulating water temperature matrix E is set as E (E1, E2, E3, E4), wherein E1 is a first preset circulating water temperature, E2 is a second preset circulating water temperature, E3 is a third preset circulating water temperature, and E4 is a fourth preset circulating water temperature, and E1<E2<E3<E4; A preset water spraying system spraying speed matrix F is set as F (F1, F2, F3, F4), wherein F2 is a second preset water spraying system spraying speed, F3 is a third preset water spraying system spraying speed, and F4 is a fourth preset water spraying system spraying speed, and F1<F2<F3<F4; A real-time circulating water temperature e is obtained, and a real-time water spraying system spraying speed f is set according to the relationship between the preset circulating water temperature matrix E and the preset water spraying system spraying speed matrix F, and the setting of the real-time water spraying system spraying speed f is specifically as follows: When e<E1, the fourth preset water spraying system spraying speed F4 is set as the real-time water spraying system spraying speed f, that is, f=F4; When E1<e<E2, the third preset water spraying system spraying speed F3 is set as the real-time water spraying system spraying speed f, that is, f=F3; When E2<e<E3, the second preset water spraying system spraying speed F2 is set as the real-time water spraying system spraying speed f, that is, f=F2; When E13<e<E4, the first preset water spraying system spraying speed F1 is set as the real-time water spraying system spraying speed f, that is, f=F1.

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