Cooling tower water conservation system, method of operation, apparatus, and readable storage medium

Abstract

The application discloses a cooling tower water-saving system, an operation method, a device and a readable storage medium, relates to the field of cooling towers, and aims to expand the working mode of the cooling tower. The cooling tower water-saving system comprises a cooling tower, a weather station and a control system. The cooling tower comprises a first air inlet, a second air inlet, a first louver, a second louver, a water inlet pipe and a water temperature detection element; the first louver is installed at the first air inlet, the second louver is installed at the second air inlet, and the water temperature detection element is installed at the water inlet pipe. The weather station is installed near the cooling tower. The control system is in driving connection with the first louver and / or the second louver, so as to adjust the opening degree of the first louver and / or the second louver. According to the technical scheme, the opening degrees of the first louver and the second louver can be adjusted respectively, so that the different heat exchange requirements and water-saving requirements of the cooling tower in different seasons can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cooling towers, in particular to a cooling tower water-saving operation method and device and a readable storage medium. BACKGROUND

[0002] The cooling tower is a key equipment for industrial water, and 70% of the industrial water is cooling water, and 80% of the heat of the industrial water is taken away by the cooling tower evaporation, so the development of high-efficiency water-saving cooling towers is committed at home and abroad.

[0003] The condensing module type cooling tower is a water-saving type cooling tower, and the cooling tower comprises a wind pipe, a fan, a condensing module, a water distribution system and water spraying filler. The cooling tower comprises two air inlet regions: a first air inlet located in the condensing module region, and a second air inlet located in the region below the water spraying filler.

[0004] The inventor found that when the cooling tower is running, the louver at the first air inlet is closed when the temperature is high in summer, air enters from the second air inlet, and after heat exchange through the filler, all the air is discharged from the outlet of the wind pipe. When the ambient temperature is low in spring, autumn and winter, the louver at the first air inlet is opened, and air enters the cooling tower from the first air inlet and the second air inlet. The air after heat exchange through the water spraying filler becomes saturated high-temperature air and enters the hot channel of the condensing module, and the cold air entering from the first air inlet enters the cold channel of the condensing module. The cold channel and the hot channel are respectively on both sides of the condensing module sheet, so that the cold air cools the saturated high-temperature air in the condensing module, and water is condensed during the cooling process to achieve the purpose of water saving. The cooling tower with the above structure is applied in areas where water resources are scarce in China, and the water saving effect is more important.

[0005] The inventor found that at least the following problems exist in the prior art: the cooling tower is operated by opening the first air inlet for water saving in spring, autumn and winter when the temperature is relatively low. Because the temperature difference between spring, autumn and winter in China is large, the cooling tower can only adopt the operation mode, and the working mode is single, and the maximum water saving operation effect cannot be achieved. SUMMARY

[0006] The present application provides a cooling tower water-saving system, operation method, device and readable storage medium to increase the working mode of the cooling tower.

[0007] The present application provides a cooling tower water-saving system, which comprises:

[0008] The cooling tower comprises a first air inlet, a second air inlet, a first louver, a second louver, a water inlet pipe and a water temperature detection element. The first louver is installed at the first air inlet, the second louver is installed at the second air inlet, and the water temperature detection element is installed at the water inlet pipe to detect the water temperature of the water inlet pipe.

[0009] a weather station installed near the cooling tower;

[0010] a control system drivingly connected with the first and / or second louvers to adjust the opening degree of the first and / or second louvers according to the first and second cooling numbers.

[0011] In some embodiments, the cooling tower further comprises:

[0012] a condensing module comprising a first flow channel and a second flow channel, the first flow channel being in communication with the first air inlet, and the second flow channel being in communication with the second air inlet.

[0013] The embodiment of the present application further provides a cooling tower water-saving operation method, comprising the following steps:

[0014] establishing a database of the corresponding relationship between the air flow at the cooling tower filler, the air speed at the cooling tower filler and the first cooling number under different opening degrees of the first and second louvers; wherein the first louver is configured to provide a first air flow to the condensing module of the cooling tower, the second louver is configured to provide a second air flow to the condensing module of the cooling tower, and the first air flow and the second air flow exchange heat; the second air flow is configured to cool the water in the cooling tower before exchanging heat with the first air flow;

[0015] obtaining the real-time inlet water temperature and the target temperature of the cooling tower;

[0016] calculating the second cooling number according to the real-time inlet water temperature and the target temperature of the cooling tower;

[0017] finding the opening degree of each of the first and second louvers when the second cooling number is equal to the first cooling number according to the second cooling number;

[0018] adjusting the opening degree of each of the first and second louvers to the same opening degree as the found result.

[0019] In some embodiments, the first cooling number is calculated by the following formula:

[0020]

[0021] wherein, the first cooling number; the first air-water ratio; a test constant; a test constant.

[0022] In some embodiments, the first air-water ratio The following formula is used to calculate:

[0023]

[0024] wherein, is the first air-water ratio; is the air speed at the filler; is the dry air density; is the water spray density.

[0025] In some embodiments, the air speed at the filler is The following formula is used to calculate:

[0026]

[0027] wherein, is the air speed at the filler; is the area ventilation of the second louvre; is the cross-sectional area of the filler area, which is a known quantity.

[0028] In some embodiments, the area ventilation of the second louvre is The following formula is used to calculate:

[0029]

[0030] wherein, is the area ventilation of the second louvre; is the air flow rate of the second louvre, is the ventilation area of the second louvre.

[0031] In some embodiments, the air flow rate of the second louvre is obtained by the following method :

[0032] a plurality of air speed detection elements are arranged at the position of the second louvre at uniform intervals;

[0033] an average air speed is calculated according to the air speed values detected by each of the air speed detection elements, and the average air speed is taken as the air flow rate of the second louvre .

[0034] In some embodiments, the dry air density is calculated by the following formula :

[0035]

[0036] wherein, is the dry air density; is the pressure corresponding to the dry air; The dry-bulb temperature of the air entering the tower is the measured value. is the gas constant for dry air.

[0037] The pressure corresponding to dry air is calculated using the following formula. :

[0038]

[0039] in, The pressure corresponding to dry air; Atmospheric pressure is a known quantity. This represents the pressure corresponding to water vapor in moist air.

[0040] In some embodiments, the pressure corresponding to water vapor in humid air is calculated using the following formula. :

[0041]

[0042] in, This represents the pressure corresponding to water vapor in moist air. The relative humidity of the air entering the tower; This is the saturated vapor pressure corresponding to the wet-bulb temperature of the air entering the tower.

[0043] In some embodiments, the saturated vapor pressure corresponding to the wet-bulb temperature of the inlet air is calculated using the following formula. :

[0044]

[0045] in, The saturated vapor pressure corresponding to the wet-bulb temperature of the air entering the tower; Here is the wet-bulb temperature of the air entering the tower, and is the measured value.

[0046] In some embodiments, the spray density is calculated using the following formula. :

[0047]

[0048] in, This refers to the density of the sprayed water. The circulating water volume of the cooling tower; The density of water; Let be the cross-sectional area of ​​the packing material, and be a known quantity.

[0049] In some embodiments, the circulating water volume of the cooling tower is obtained using the following method. : detecting the flow of the water inlet pipe of the cooling tower respectively upstream and downstream of the straight pipe section of the water inlet pipe; taking the average of the flow of the water inlet pipe upstream and downstream of the straight pipe section of the water inlet pipe as the circulating water volume of the cooling tower .

[0050] In some embodiments, the second cooling number is calculated using the following formula :

[0051]

[0052] wherein, the second cooling number; the current inlet water temperature of the tower; the target outlet water temperature value of the tower; the specific heat capacity of water; an intermediate parameter related to ; an intermediate parameter related to ; the air enthalpy; the inlet air enthalpy; the outlet air enthalpy; the average of and .

[0053] In some embodiments, the second cooling number is calculated using the following formula :

[0054]

[0055] wherein, an intermediate parameter related to ; the inlet air enthalpy; the current inlet water temperature of the tower; the corresponding pressure; the atmospheric pressure; the inlet air relative humidity. In some embodiments, the second cooling number is calculated using the following formula

[0056] :

[0057] wherein,

[0058] the current inlet water temperature of the tower. In some embodiments, the second cooling number is calculated using the following formula

[0059] :

[0060] ​

[0061] wherein, is an intermediate parameter related to ; is the outlet air enthalpy; is the target outlet water temperature value; is the corresponding pressure; is the atmospheric pressure; is the inlet air relative humidity.

[0062] In some embodiments, the inlet air enthalpy is calculated using the following formula:

[0063]

[0064] wherein, is the target outlet water temperature value.

[0065] In some embodiments, the outlet air enthalpy is calculated using the following formula:

[0066]

[0067] wherein, is the and average value; is the current inlet water temperature; is the target outlet water temperature value; is the corresponding pressure; is the atmospheric pressure; is the inlet air relative humidity.

[0068] In some embodiments, the inlet air enthalpy is calculated using the following formula:

[0069]

[0070] wherein, is the and average value; is the current inlet water temperature; is the target outlet water temperature value.

[0071] In some embodiments, the inlet air enthalpy is calculated using the following formula:

[0072]

[0073] wherein, is the inlet air enthalpy; is the inlet air dry bulb temperature; Relative humidity of the air entering the tower; Saturation vapor pressure corresponding to the wet bulb temperature of the air entering the tower; Atmospheric pressure.

[0074] In some embodiments, the saturation vapor pressure corresponding to the wet bulb temperature of the air entering the tower is calculated using the following equation :

[0075]

[0076] where, Saturation vapor pressure corresponding to the wet bulb temperature of the air entering the tower; Wet bulb temperature of the air entering the tower.

[0077] In some embodiments, the wet bulb temperature of the air entering the tower is calculated using the following equation :

[0078]

[0079] where, Relative humidity of the air entering the tower, measured; Saturation vapor pressure corresponding to the wet bulb temperature of the air entering the tower; Atmospheric pressure, measured; Dry bulb temperature of the air entering the tower, measured; Wet bulb temperature of the air entering the tower; Saturation vapor pressure corresponding to the dry bulb temperature of the air entering the tower.

[0080] In some embodiments, the saturation vapor pressure corresponding to the dry bulb temperature of the air entering the tower is calculated using the following equation :

[0081]

[0082] where, Saturation vapor pressure corresponding to the dry bulb temperature of the air entering the tower; Dry bulb temperature of the air entering the tower, measured.

[0083] In some embodiments, the enthalpy of the outlet air is calculated using the following equation :

[0084]

[0085] where, Enthalpy of the inlet air; Enthalpy of the outlet air; Specific heat capacity of water; Atmospheric pressure, measured; Second air to water ratio, assumed.

[0086] In some embodiments, the following formula is used to calculate :

[0087]

[0088] wherein, is the import air enthalpy; is the export air enthalpy.

[0089] Some embodiments of the present application provide a condensing modular cooling tower water-saving operation device, comprising:

[0090] a memory; and

[0091] a processor coupled to the memory, the processor configured to perform the condensing modular cooling tower water-saving operation method according to any of the technical solutions of the present application based on instructions stored in the memory.

[0092] Some embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the condensing modular cooling tower water-saving operation method according to any of the technical solutions of the present application.

[0093] The cooling tower water-saving system provided by the above technical solution has a first louver installed at the first air inlet and a second louver installed at the second air inlet, and the opening degree of each of the first louver and the second louver can be adjusted according to the first cooling number and the second cooling number. Different opening degrees of the first louver and the second louver correspond to different cooling effects and water-saving effects. The above technical solution flexibly adjusts the opening degree of each of the first louver and the second louver to meet the different heat exchange requirements of the cooling tower in different seasons, and at the same time, the water-saving effect is maximized while meeting the cooling water temperature requirement, achieving the balance between water saving and heat exchange. BRIEF DESCRIPTION OF DRAWINGS

[0094] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0095] Figure 1 The cooling tower water-saving system structure schematic diagram provided by the embodiments of the present application.

[0096] Figure 2 The cooling tower water-saving operation method schematic diagram provided by the embodiments of the present application.

[0097] Figure 3 The schematic diagram of arranging the wind speed detection element in the cooling tower water-saving operation method provided by the embodiments of the present application.

[0098] Figure label:

[0099] 1. Cooling tower; 2. Weather station; 3. Control system;

[0100] 11. First air inlet; 12. Second air inlet; 13. First louver; 14. Second louver; 15. Water inlet pipe; 16. Water temperature detection element; 17. Condensation module; 18. Packing material; 19. Air duct; 110. Fan; 111. Fan drive component; 112. Water collector; 113. Nozzle; 114. Flow meter; 115. Water tank; 116. Wind speed detection element; 10. Tower body. Detailed Implementation

[0101] The following is combined Figures 1-3 The technical solutions provided by this invention will be described in more detail below. The descriptions of exemplary embodiments are merely illustrative and are in no way intended to limit this disclosure or its application or use. This disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of this disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0102] The terms “first,” “second,” and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as “including” or “contains” mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility of covering other elements as well.

[0103] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0104] All terms used in this disclosure, including technical or scientific terms, have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0105] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art(s) can not be discussed in detail herein. However, where appropriate, techniques, methods, and apparatus are contemplated to be part of the disclosure.

[0106] The size of each part shown in the drawings is not drawn in accordance with the actual proportional relationship. In the drawings, the same reference numerals are added to common structural elements or the same kind of structural elements, and the repeated description of them is appropriately omitted.

[0107] The inventor found through research that the air intake of the cooling tower is related to the water saving effect, and by adjusting the opening degree of the first air inlet and the second air inlet of the cooling tower, the cooling effect and the water saving effect can be effectively balanced. Therefore, the following technical solutions are proposed.

[0108] Referring to Figure 1 , the cooling tower water saving operation device includes a cooling tower 1, a weather station 2, and a control system 3. The cooling tower 1 includes a first air inlet 11, a second air inlet 12, a first louver 13, a second louver 14, a water inlet pipe 15, and a water temperature detection element 16. The first louver 13 is installed at the first air inlet 11, the second louver 14 is installed at the second air inlet 12, and the water temperature detection element 16 is installed at the water inlet pipe 15 to detect the water temperature of the water inlet pipe 15. The weather station 2 is installed near the cooling tower 1. The control system 3 is drivingly connected with the first louver 13 and / or the second louver 14 to adjust the opening degree of the first louver 13 and / or the second louver 14 according to the first cooling number and the second cooling number. The calculation method of the first cooling number and the second cooling number is described below. When the first cooling number and the second cooling number are equal, it means that the required heat exchange effect and the opening degree relationship of the first louver 13 and the second louver 14 under the current state of the cooling tower meet the heat exchange requirement.

[0109] The cooling tower 1 is a condensation module type cooling tower, which belongs to a water-saving type cooling tower. The cooling tower 1 comprises a tower body 10, a wind pipe 19 located at the top of the tower body 10, a fan 110 located inside the wind pipe 19 and at the top of the tower body 10, a fan driving component 111 for driving the fan 110, and a water pool 115 located at the bottom of the tower body 10. From top to bottom, the inner wall of the tower body 10 is provided with a condensation module 17, a water collector 112, a spray head 113, and a filler 18. The wall of the tower body 10 is provided with two groups of air inlets, i.e., a first air inlet 11 and a second air inlet 12. The first air inlet 11 is located higher than the second air inlet 12. The first air inlet 11 is provided with a first louver 13, and the second air inlet 12 is provided with a second louver 14. The first air inlet 11 is located above the second air inlet 12. The first air inlet 11 corresponds to the condensation module 17, and is located lower than the condensation module 17. The second air inlet 12 corresponds to the filler 18, and is located lower than the filler 18. The water pool 115 is located lower than the second air inlet 12. The water inlet pipe 15 of the water pool 115 is provided with an ultrasonic flow meter 114 for detecting the real-time water inlet flow. The water inlet pipe 15 of the water pool 115 is also provided with a water temperature detection element 16 for detecting the real-time water inlet temperature .

[0110] In some embodiments, the cooling tower 1 further comprises a condensation module 17, which comprises a first flow channel (not shown in the figure) and a second flow channel (not shown in the figure) that can exchange heat. The first flow channel communicates with the first air inlet 11, and the second flow channel communicates with the second air inlet 12. The arrangement positions of the first flow channel and the second flow channel meet the following requirements: the fluid in the first flow channel and the fluid in the second flow channel exchange heat.

[0111] The condensation module 17 is used to realize the heat exchange of two fluids, and comprises a first flow channel and a second flow channel that can exchange heat with each other. The first fluid is the air flow entering from the first air inlet 11, and the temperature of the air flow is the same as the ambient temperature. The fluid enters the first flow channel. The second fluid is the air flow entering from the second air inlet 12 under the driving of the fan 110. The air flow flows upward in the cooling tower 1, exchanges heat with the filler 18, becomes a high-temperature fluid, and reaches the second flow channel of the condensation module 17. The low-temperature fluid in the first flow channel and the high-temperature fluid in the second flow channel exchange heat, so as to condense the water in the high-temperature fluid in the second flow channel, reduce the water flowing out of the cooling tower 1, and realize water saving of the cooling tower 1.

[0112] Continuing to refer to Figure 1The weather station 2 is arranged near the cooling tower 1, about 20-50 m away. For a region with a specific main wind direction, the weather station 2 can be arranged upwind of the cooling tower 1. The weather station 2 is used to detect environmental parameters and send them to the control system 3. Through the weather station 2, atmospheric state parameters such as temperature, humidity, and air pressure, and weather phenomenon parameters such as wind speed, wind direction, and precipitation can be obtained in real time.

[0113] The control system 3 controls the opening degree of the first and second louvers 13 and 14 according to the required heat exchange effect. The control system 3 can include two separate motors, one of which controls the opening degree of the first louver 13, and the other of which controls the opening degree of the second louver 14. The two fans are controlled and driven independently, which is more accurate, convenient, and efficient.

[0114] The opening degree of the first louver 13 determines the flow rate of the low-temperature fluid entering the condensing module 17. The greater the opening degree of the first louver 13, the more low-temperature fluid enters the condensing module 17, and the better the heat exchange effect. However, in seasons with low temperatures, such as winter, spring, and autumn, a large amount of low-temperature fluid is not needed. In seasons with high temperatures, such as summer, sufficient low-temperature fluid is needed. The opening degree of the first louver 13 is different in different seasons.

[0115] The opening degree of the second louver 14 determines the flow rate of the fluid entering the cooling tower 1, which is heated to a high-temperature fluid after passing through the filler 18. The more fluid that enters through the second louver 14, the more water is carried away by the filler 18, and the more water is lost by the entire cooling tower 1. At the same time, the second fluid also cools the sprayed water. If too little fluid enters through the second air inlet 12, the cooling effect on the sprayed water may be poor, which can cause the water temperature to be too high when it flows out of the cooling tower 1, and the cooling effect of the cooling tower 1 to be compromised. Therefore, the opening degree of the second louver 14 also needs to be appropriate. The opening degree of the second louver 14 is different in different seasons.

[0116] As can be seen, the opening degrees of the first and second louvers 13 and 14 need to be set according to the heat exchange demand and water saving effect.

[0117] In some embodiments, the following cooling tower water saving operation method is used to balance the cooling demand and water saving demand of the cooling tower 1.

[0118] Before the method is run, the required parameters are obtained: inlet air temperature, relative humidity, atmospheric pressure, inlet water temperature, target water temperature, and water flow rate. In addition, the air flow rate at the second air inlet 12 needs to be measured in real time. Then, the following steps are followed for control:

[0119] Step S100, establish the database of the corresponding relationship of the air flow at the filler 18 of the cooling tower 1, the wind speed at the filler, and the first cooling number under different opening degrees of the first louvers 13 and the second louvers 14. The first louvers 13 are configured to provide the first air flow to the condensing module 17 of the cooling tower 1, the second louvers 14 are configured to provide the second air flow to the condensing module 17 of the cooling tower 1, and the first air flow and the second air flow exchange heat; the second air flow is configured to cool the water in the cooling tower 1 before exchanging heat with the first air flow. In this paper, the cooling number in the first cooling number and the second cooling number is a dimensionless number derived from the heat and mass exchange theory between the water and the air in the cooling tower. It reflects the mass transfer and heat transfer capacity required to cool the hot water to a given temperature under a specific working condition of the cooling tower.

[0120] For a cooling tower 1, step S100 can be completed in advance, and the resulting data is stored in the database. When the first louvers 13 and the second louvers 14 need to be controlled, the data in the database can be queried as needed.

[0121] In the above step S100, the first cooling number The following formula is used for calculation:

[0122]

[0123] Wherein, is the first cooling number; is the first air-water ratio; is a test constant; is a test constant. A series of can be calculated by taking different values. The values of and the corresponding relationship of can be stored in the database.

[0124] Specifically, the first air-water ratio is calculated using the following formula:

[0125]

[0126] Wherein, is the first air-water ratio; is the wind speed at the filler; is the dry air density; is the water density. The above formula can be used to calculate the first air-water ratio .

[0127] Specifically, the wind speed at the filler is calculated using the following formula:

[0128]

[0129] wherein, is the wind speed at the filler; is the area ventilation of the second louvers 14; is the cross-sectional area of the filler 18 region, which is a known quantity. For a cooling tower 1 of a certain model, the structure and size of the filler 18 installed thereon are determined, so this parameter is a known quantity.

[0130] Specifically, the area ventilation of the second louvers 14 is calculated using the following formula:

[0131]

[0132] wherein, is the area ventilation of the second louvers 14; is the airflow flow rate of the second louvers 14, is the ventilation area of the second louvers 14. It is to be noted that the area ventilation of the second louvers 14 refers to the ventilation of the entire region of the second louvers 14. If the second louvers 14 are divided into multiple sub-regions, the sum of the ventilation of all the sub-regions is the area ventilation of the second louvers 14 .

[0133] The airflow flow rate of the second louvers 14 is obtained using the following method:

[0134] First, multiple wind speed detection elements 116 are arranged at the position of the second louvers 14 at uniform intervals. The wind speed detection elements 116 are specifically, for example, an impeller anemometer, with an instrument accuracy of 0.1 m / s. Figure 2 A schematic diagram showing that the wind speed detection elements 116 are uniformly arranged at the second air inlet 12 is shown. When the second louvers 14 are at different opening degrees, the wind speed values detected by each wind speed detection element 116 are different.

[0135] Second, according to the wind speed values detected by each wind speed detection element 116, the average wind speed is calculated, and the average wind speed is taken as the airflow flow rate of the second louvers 14 .

[0136] Next, how to calculate the dry air density is introduced. The dry air density is calculated using the following formula:

[0137]

[0138] wherein, is the dry air density; is the pressure corresponding to the dry air; Tin is the dry bulb temperature of the air entering the tower, and is a measured value; R is the gas constant for dry air. By using the above equation, the density of dry air can be accurately calculated .

[0139] The density of air is equal to the density of dry air plus the partial pressure of water vapor in the air. The partial pressure of water vapor in the air is equal to the pressure of water vapor in the wet air divided by a set value, which is equal to the product of the gas constant for water vapor and a set temperature value. The set temperature value is equal to the dry bulb temperature of the ambient air plus a constant, which is equal to 273.15.

[0140] The pressure of dry air is calculated using the following equation :

[0141]

[0142] where, Pdry is the pressure of dry air; P is the atmospheric pressure, which is a known quantity; Pwet is the pressure of water vapor in the wet air.

[0143] The pressure of water vapor in the wet air is calculated using the following equation :

[0144]

[0145] where, Pwet is the pressure of water vapor in the wet air; Rh is the relative humidity of the air entering the tower; Psat is the saturation vapor pressure corresponding to the wet bulb temperature of the air entering the tower.

[0146] The saturation vapor pressure corresponding to the wet bulb temperature of the air entering the tower is calculated using the following equation :

[0147]

[0148] where, Psat is the saturation vapor pressure corresponding to the wet bulb temperature of the air entering the tower; Tw is the wet bulb temperature of the air entering the tower, which is a measured value.

[0149] The following describes how to calculate the water spray density . The water spray density is calculated using the following equation :

[0150]

[0151] where, the water density; the circulating water volume of the cooling tower 1; the water density; the cross-sectional area of the filler 18, which is a known quantity as introduced above.

[0152] The circulating water volume of the cooling tower 1 is obtained by the following method :

[0153] First, the flow rate of the inlet pipe 15 is detected upstream and downstream of the straight pipe section of the inlet pipe 15 of the cooling tower 1.

[0154] Second, the average of the flow rates upstream and downstream of the straight pipe section of the inlet pipe 15 is taken as the circulating water volume of the cooling tower 1 .

[0155] By changing the opening degree of each of the first louvers 13 and the second louvers 14 and repeating the above calculation process, the following can be obtained:

[0156] When the first opening degree of the first louvers 13 is 0 and the opening degree of the second louvers 14 is 0, 10%, 20%...100%, the air flow rate at the filler of the cooling tower 1 and the wind speed at the filler.

[0157] When the first opening degree of the first louvers 13 is 10% and the opening degree of the second louvers 14 is 0, 10%, 20%...100%, the air flow rate at the filler of the cooling tower 1 and the wind speed at the filler.

[0158] When the first opening degree of the first louvers 13 is 20% and the opening degree of the second louvers 14 is 0, 10%, 20%...100%, the air flow rate at the filler of the cooling tower 1 and the wind speed at the filler.

[0159] And so on until when the first opening degree of the first louvers 13 is 20% and the opening degree of the second louvers 14 is 0, 10%, 20%...100%, the air flow rate at the filler of the cooling tower 1 and the wind speed at the filler.

[0160] It should be noted that the above is only illustrative. The variable of each opening degree adjustment can also be set to 1%, for example, when the first opening degree of the first louvers 13 is 0 and the opening degree of the second louvers 14 is 0, 1%, 2%...100%, the air flow rate at the filler of the cooling tower 1 and the wind speed at the filler. When the first opening degree of the first louvers 13 is 1% and the opening degree of the second louvers 14 is 0, 1%, 2%...100%, the air flow rate at the filler of the cooling tower 1 and the wind speed at the filler, repeat the above steps until the first opening degree of the first louvers 13 is 100% and the opening degree of the second louvers 14 is 0, 1%, 2%...100%, the air flow rate at the filler of the cooling tower 1 and the wind speed at the filler.

[0161] In order to make the control more accurate, the variable of each opening adjustment can also be set to 0.1%, or even a smaller value. The calculation method is the same as the process described above, which will not be described again.

[0162] In step S200, the real-time inlet water temperature and the target temperature of the cooling tower 1 are obtained. The temperature detection element can be used to detect the real-time inlet water temperature and the target temperature of the cooling tower 1. The real-time inlet water temperature is a measured value, which can be detected in real time by a temperature sensor. Specifically, a platinum resistance thermometer can be used, and the measurement accuracy of the platinum resistance thermometer is ±0.2℃. The measured water temperature is transmitted to the industrial computer of the control system 3 in real time through a data acquisition card by using a data line.

[0163] In step S300, the second cooling number is calculated according to the real-time inlet water temperature and the target temperature of the cooling tower 1.

[0164] In the above step S300, the second cooling number is calculated by the following formula :

[0165]

[0166] wherein, the second cooling number; the current inlet tower water temperature; the target outlet tower water temperature value; the specific heat capacity of water; an intermediate parameter related to ; an intermediate parameter related to ; an intermediate parameter related to ; the inlet air enthalpy; the outlet air enthalpy; the average value of and . Through the above formula, the second cooling number can be accurately calculated.

[0167] In the above formula, , , , , , all need to be calculated.

[0168] Specifically, the following formula is used to calculate :

[0169]

[0170] Wherein, is an intermediate parameter related to ; is the import air enthalpy; is the current tower inlet water temperature; is the corresponding pressure; is the atmospheric pressure; is the tower inlet air relative humidity.

[0171] Wherein, the following formula is used to calculate :

[0172]

[0173] Wherein, is the current tower inlet water temperature, which is a real-time measurement value.

[0174] Wherein, the following formula is used to calculate :

[0175]

[0176] Wherein, is an intermediate parameter related to ; is the export air enthalpy; is the target tower outlet water temperature value; is the corresponding pressure; is the atmospheric pressure; is the tower inlet air relative humidity.

[0177] Wherein, the following formula is used to calculate :

[0178]

[0179] Wherein, is the target tower outlet water temperature value. Using the above formula, the can be accurately calculated.

[0180] Wherein, the following formula is used to calculate :

[0181]

[0182] Wherein, is the average value of and ; is the import air enthalpy; is the export air enthalpy.

[0183] Wherein, the following formula is used to calculate :

[0184]

[0185] in, for and The average value; The current inlet water temperature; The target outlet water temperature value; for The corresponding pressure; Atmospheric pressure; The relative humidity of the air entering the tower.

[0186] The following formula is used for calculation. :

[0187]

[0188] in, for and The average value; The current inlet water temperature; The target outlet water temperature value.

[0189] The enthalpy of the inlet air is calculated using the following formula. :

[0190]

[0191] in, Enthalpy of imported air; This refers to the dry-bulb temperature of the air entering the tower. The relative humidity of the air entering the tower; The saturated vapor pressure corresponding to the wet-bulb temperature of the air entering the tower; Atmospheric pressure.

[0192] The saturated vapor pressure corresponding to the wet-bulb temperature of the inlet air is calculated using the following formula. :

[0193]

[0194] in, The saturated vapor pressure corresponding to the wet-bulb temperature of the air entering the tower; The wet-bulb temperature of the air entering the tower.

[0195] The wet-bulb temperature of the air entering the tower is calculated using the following formula. :

[0196]

[0197] in, is the relative humidity of the air entering the tower, measured value; is the saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower; is the atmospheric pressure, measured value; is the dry bulb temperature of the air entering the tower, measured value; is the wet bulb temperature of the air entering the tower; is the saturated vapor pressure corresponding to the dry bulb temperature of the air entering the tower.

[0198] Specifically, the saturated vapor pressure corresponding to the dry bulb temperature of the air entering the tower is calculated using the following formula :

[0199]

[0200] wherein, is the saturated vapor pressure corresponding to the dry bulb temperature of the air entering the tower; is the dry bulb temperature of the air entering the tower, measured value.

[0201] wherein, the outlet air enthalpy is calculated using the following formula :

[0202]

[0203] wherein, is the inlet air enthalpy; is the outlet air enthalpy; is the specific heat capacity of water; is the; is the second air-water ratio, assumed value. In the actual calculation process, the takes multiple different values, and ultimately multiple second cooling numbers can be obtained.

[0204] wherein, the second cooling number is calculated using the following formula :

[0205]

[0206] wherein, is the inlet air enthalpy; is the outlet air enthalpy.

[0207] Step S400, according to the calculated second cooling number, find the opening of the first louver 13 and the second louver 14 respectively when the second cooling number is equal to the first cooling number.

[0208] Step S500, according to the search result, adjust the opening of the first louver 13 and the second louver 14 respectively to the opening corresponding to the search result.

[0209] The condensing module type cooling tower water-saving operation method provided by the technical scheme has the advantages that the first cooling number database is calculated according to the assumed opening of the first louver 13 and the assumed opening of the second louver 14; the second cooling number is calculated according to the actual cooling effect to be achieved; when the first cooling number is the same as the second cooling number, the first cooling number corresponds to a set of respective openings of the first louver 13 and the second louver 14, and the opening is the opening actually to be adjusted by the first louver 13 and the second louver 14.

[0210] The condensing module type cooling tower water-saving operation device provided by the embodiment of the application comprises a memory and a processor coupled to the memory, and the processor is configured to execute the cooling tower water-saving operation method in any one of the preceding embodiments based on the instructions stored in the memory.

[0211] The memory may, for example, include a system memory, a fixed non-volatile storage medium, etc. The system memory may, for example, store an operating system, an application program, a Boot Loader and other programs, etc.

[0212] Some embodiments of the disclosure also provide a computer readable storage medium having a computer program stored thereon. When the program is executed by a processor, the cooling tower water-saving operation method in any one of the preceding embodiments is implemented.

[0213] The processor described herein can include a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0214] The computer readable media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer readable media.

[0215] Those skilled in the art will appreciate that the method embodiments of this disclosure can be readily implemented as method, system or computer program product. Accordingly, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the disclosure can take the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0216] The present disclosure is described herein with reference to the drawings, in which various embodiments of the present disclosure are illustrated. The following detailed description is presented in connection with these drawings, which describe the preferred embodiments of the disclosure. It should be noted that from the pursuit of conciseness and clarity, the accompanying drawings denote only those functional configuration elements that are essential to understanding the technical solutions of the present disclosure, and thus, other functional configuration elements not described herein are omitted. It should be further noted that the drawings are in simplified form and are not drawn to precise scale. In reference Figure 1 one or more functions specified in the flow or flows and / or block or blocks. Figure 1 means for performing one or more functions specified in the flow or flows and / or block or blocks.

[0217] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flowFigure 1 one or more processes and / or blocks Figure 1 the function specified in the one or more blocks.

[0218] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are performed on the computer or other programmable data processing devices to generate a computer implemented process, so that the instructions executed on the computer or other programmable data processing devices provide steps for implementing the function specified in the flowchart Figure 1 one or more processes and / or blocks Figure 1 the function specified in the one or more blocks.

[0219] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the scope of protection of the present application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0220] In the description of the present application, each technical feature can be combined with other technical features as far as possible.

[0221] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cooling tower water conservation system, characterized by, The application relates to a cooling tower water-saving system, which comprises the following components: a cooling tower (1) comprising a first air inlet (11), a second air inlet (12), a first louvre (13), a second louvre (14), a water inlet pipe (15) and a water temperature detection element (16); the first louvre (13) is installed at the first air inlet (11), the second louvre (14) is installed at the second air inlet (12), and the water temperature detection element (16) is installed on the water inlet pipe (15) to detect the water inlet temperature of the water inlet pipe (15); a weather station (2) installed near the cooling tower (1); and a control system (3) drivingly connected with the first louvre (13) and / or the second louvre (14) to adjust the opening degree of the first louvre (13) and / or the second louvre (14) according to a first cooling number and a second cooling number. The adjustment of the opening degree of the first louvre (13) and / or the second louvre (14) according to the first cooling number and the second cooling number comprises the following steps: wherein the first cooling number The following formula is used for the calculation: wherein, is the first cooling number; is the first gas-water ratio; is the test constant; is the test constant; the first gas-water ratio The following formula is used for the calculation: wherein, is the first air to water ratio; is the filler air velocity; is the dry air density; is the water spray density; The second cooling number is calculated using the following equation : wherein, is the second cooling number; is the current inlet water temperature; is the target outlet water temperature value; is the specific heat capacity of water; is an intermediate parameter related to ; is an intermediate parameter related to ; is an intermediate parameter related to ; is the inlet air enthalpy; is the outlet air enthalpy; is the average of and ; establishing a database of the corresponding relationship among the air flow at the filler (18) of the cooling tower (1), the wind speed at the filler (18) and the first cooling number when the first louvre (13) and the second louvre (14) are at different opening degrees; obtaining the real-time water inlet temperature and the target temperature of the current cooling tower (1); calculating the second cooling number according to the real-time water inlet temperature and the target temperature of the cooling tower (1); finding the opening degree of the first louvre (13) and the second louvre (14) respectively when the second cooling number is equal to the first cooling number according to the calculated second cooling number; adjusting the opening degree of the first louvre (13) and the second louvre (14) respectively to the opening degree corresponding to the finding result according to the finding result. The cooling tower (1) further comprises:

2. The cooling tower water conservation system of claim 1, wherein, a condensing module (17) comprising a first flow channel and a second flow channel; the first flow channel is communicated with the first air inlet (11), and the second flow channel is communicated with the second air inlet (12). The application further discloses a cooling tower water-saving operation method, which comprises the following steps:

3. A method of operating a cooling tower in a water conservation mode, comprising: establishing a database of the corresponding relationship among the air flow at the filler (18) of the cooling tower (1), the wind speed at the filler (18) and the first cooling number when the first louvre (13) and the second louvre (14) are at different opening degrees; wherein the first louvre (13) is configured to provide a first air flow to the condensing module (17) of the cooling tower (1), the second louvre (14) is configured to provide a second air flow to the condensing module (17) of the cooling tower (1), and the first air flow and the second air flow exchange heat; the second air flow is configured to cool the water in the cooling tower (1) before exchanging heat with the first air flow; obtaining the real-time water inlet temperature and the target temperature of the current cooling tower (1); calculating the second cooling number according to the real-time water inlet temperature and the target temperature of the cooling tower (1); and ​ According to the calculated second cooling number, the opening degree of each of the first louver (13) and the second louver (14) is adjusted to the opening degree corresponding to the finding result when the second cooling number is equal to the first cooling number. According to the finding result, the opening degree of each of the first louver (13) and the second louver (14) is adjusted to the opening degree corresponding to the finding result.

4. The cooling tower water conservation method of claim 3, wherein The wind speed at the packing Calculate using the following formula: wherein, is the wind speed at the filler; is the area ventilation of the second louver (14); is the cross-sectional area of the filler zone, which is a known quantity.

5. The cooling tower water conservation method of claim 4, wherein The area ventilation of the second louvers (14) The following formula is used for calculation: wherein, is the area ventilation of the second louver (14); is the airflow flow rate of the second louver (14), is the ventilation area of the second louver (14).

6. The cooling tower water conservation method of claim 5, wherein, The following method is used to obtain the airflow rate of the second louver (14) : A plurality of wind speed detection elements are arranged at positions of the second louver (14) evenly spaced apart; According to the wind speed values detected by the respective wind speed detection elements, an average value of the wind speed is calculated and used as the airflow speed of the second louvers (14) .

7. The cooling tower water conservation method of claim 3, wherein The dry air density is calculated using the following equation : wherein, is the dry air density; is the pressure corresponding to the dry air; is the dry bulb temperature of the air entering the tower, measured; is the dry air gas constant.

8. The cooling tower water conservation method of claim 7, wherein, The pressure corresponding to the dry air is calculated using the following formula : wherein is the pressure corresponding to dry air; is the atmospheric pressure; is the pressure corresponding to water vapor in humid air.

9. The cooling tower water conservation method of claim 8, wherein, The pressure corresponding to the water vapor in the humid air is calculated using the following formula : wherein, Pw is the pressure corresponding to the water vapor in the wet air; Rh is the relative humidity of the air entering the tower; Pws is the saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower.

10. The cooling tower water conservation method of claim 9, wherein, The saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower is calculated using the following equation : wherein, Pw is the saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower; Pw is the saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower, and 11. The cooling tower water conservation method of claim 3, wherein The water spray density is calculated using the following formula : wherein is the water density; is the circulating water volume of the cooling tower (1); is the water density; is the cross-sectional area of the packing (18).

12. The cooling tower water conservation method of claim 11, wherein, The following method is used to obtain the circulating water quantity of the cooling tower (1) : The flow of the water inlet pipe (15) is detected upstream and downstream of the straight pipe section of the water inlet pipe (15) of the cooling tower (1); averaging the flow rates upstream and downstream of the straight pipe section of the inlet pipe (15) to obtain the circulating water volume of the cooling tower (1) .

13. The cooling tower water conservation method of claim 3, wherein The following formula is used to calculate : wherein, is an intermediate parameter related to ; is the import air enthalpy; is the current tower inlet water temperature; is the corresponding pressure; is atmospheric pressure; is the tower inlet air relative humidity.

14. The cooling tower water conservation method of claim 13, wherein The following formula is used to calculate : wherein, Tc = current column inlet water temperature.

15. The cooling tower water conservation method of claim 13, wherein The following formula is used to calculate : wherein, is an intermediate parameter related to ; is the outlet air enthalpy; is the target outlet tower water temperature value; is the corresponding pressure; is the atmospheric pressure; is the inlet tower air relative humidity.

16. The cooling tower water conservation method of claim 15, wherein The following formula is used to calculate : wherein, Target out-tower water temperature value.

17. The cooling tower water conservation method of claim 3, wherein The following formula is used to calculate : wherein, is the average value of and ; is the current inlet water temperature; is the target outlet water temperature value; is the average value of the corresponding pressure; is atmospheric pressure; is the relative humidity of the inlet air.

18. The cooling tower water conservation method of claim 17, wherein, The following formula is used to calculate : wherein, is and the average value; is the current inlet water temperature; is the target outlet water temperature value.

19. The cooling tower water conservation method of claim 3, wherein The enthalpy of the inlet air is calculated using the following equation : wherein, is the enthalpy of the inlet air; is the dry bulb temperature of the inlet air to the tower; is the relative humidity of the inlet air to the tower; is the saturation vapor pressure corresponding to the wet bulb temperature of the inlet air to the tower; is the atmospheric pressure.

20. The cooling tower water conservation method of claim 19, wherein, The saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower is calculated using the following equation : wherein, Pw is the saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower; Tw is the wet bulb temperature of the air entering the tower.

21. The cooling tower water conservation method of claim 20, wherein, The wet bulb temperature of the air entering the tower is calculated using the following equation : wherein, is the relative humidity of the air entering the tower, measured; is the saturated vapor pressure corresponding to the wet bulb temperature of the air entering the tower; is atmospheric pressure, measured; is the dry bulb temperature of the air entering the tower, measured; is the wet bulb temperature of the air entering the tower; is the saturated vapor pressure corresponding to the dry bulb temperature of the air entering the tower.

22. The cooling tower water conservation method of claim 21, wherein The following equation was used to calculate the saturated vapor pressure corresponding to the dry bulb temperature of the air entering the tower : wherein, P is the saturated vapor pressure corresponding to the dry bulb temperature of the air entering the tower; P is the saturated vapor pressure corresponding to the dry bulb temperature of the air entering the tower, measured.

23. The cooling tower water conservation method of claim 3 wherein, The outlet air enthalpy is calculated using the following equation : wherein, is the enthalpy of the inlet air; is the enthalpy of the outlet air; is the specific heat capacity of water; is the; is the second gas-water ratio.

24. The cooling tower water conservation method of claim 3 wherein, The following formula is used to calculate : wherein, hout is the outlet air enthalpy; hout is the outlet air enthalpy.

25. A condensing modular cooling tower water saving operation device, characterized in that, Comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the cooling tower water-saving operation method according to any one of claims 3-24 based on instructions stored in the memory.

26. A computer-readable storage medium, characterized in that, A computer program is stored thereon, which is executed by the processor to implement the cooling tower water-saving operation method according to any one of claims 3-24.

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