Outlet density Freund's number monitoring system and method, electronic equipment and storage medium

Abstract

The invention provides an outlet density Freund's number monitoring system and method, electronic equipment and a storage medium. The monitoring device is applied to the cooling tower and comprises a thermometer used for testing the temperature of air out of the cooling tower, and a measuring point is arranged at the throat part of the cooling tower; the impeller anemograph is used for testing the flowing speed of air out of the cooling tower and is the same as the arrangement of measuring points of the temperature of the air out of the cooling tower; the meteorological station is used for testing tower inlet air parameters of the cooling tower, and testing points are arranged at an air inlet of the cooling tower; the data acquisition card is used for carrying out acquisition and signal conversion on test data of the air temperature of the out-of-tower air, the flow velocity of the out-of-tower air and the parameters of the in-tower air, and transmitting the test data to the industrial personal computer; the industrial personal computer is used for determining the outlet density Freund's number of the cooling tower according to the test data of the outlet air temperature, the outlet air flow speed and the inlet air parameters, and outputting the outlet density Freund's number of the cooling tower, the system and the method are simple in structure and easy to implement, and the outlet density Freund's number of the cooling tower can be accurately monitored.

Description

Technical Field

[0001] The present disclosure relates to the field of cooling towers, and in particular to an outlet density Freund number monitoring system, method, electronic equipment and storage medium. Background Art

[0002] The outlet shape of the cooling tower is one of the important components of the tower type. The rationality of its design seriously affects the working efficiency of the cooling tower. When the throat and outlet size of the cooling tower are not designed properly, part of the cold air will flow back into the cooling tower, thereby reducing the suction force of the cooling tower and affecting the efficiency of the cooling tower. By studying the outlet flow pattern of the cooling tower, we can understand the relationship between the outlet shape of the cooling tower and the backflow of cold air into the tower. Among them, the outlet flow pattern of the cooling tower is related to the outlet density Freund number of the cooling tower. Real-time monitoring of the outlet density Freund number of the cooling tower is of great significance to guiding the reasonable and economical operation of the cooling tower. However, the relevant technology has not yet realized the monitoring of the outlet density Freund number of the cooling tower. Summary of the invention

[0003] The present invention provides an outlet density and Fresnel number monitoring system, method, electronic device and storage medium.

[0004] According to a first aspect of the present disclosure, a monitoring system for outlet density Freund number is provided. The monitoring system for the detection device is applied to a cooling tower. The monitoring system for the detection device includes: a thermometer, which is used to test the air temperature of the outlet air of the cooling tower, and the measuring point of the air temperature of the outlet air is arranged at the throat of the cooling tower; an impeller anemometer, which is used to test the air velocity of the outlet air of the cooling tower, and the measuring points of the air velocity of the outlet air are arranged in the same manner as the measuring points of the air temperature of the outlet air; a meteorological station, which is used to test the air parameters of the inlet air of the cooling tower, and the measuring points of the air parameters of the inlet air are arranged in the same manner. The data acquisition card is placed at the air inlet of the cooling tower; the data acquisition card is connected to the meteorological station, the thermometer and the impeller anemometer through data lines, and the data acquisition card is used to collect and convert the test data of the air temperature, the air flow rate and the air parameters of the tower outlet air, and transmit the signals to the industrial computer; and the industrial computer is connected to the data acquisition card through a data line, and the industrial computer is used to determine the outlet density Freund number of the cooling tower according to the test data of the air temperature, the air flow rate and the air parameters of the tower outlet air, and output the outlet density Freund number of the cooling tower.

[0005] In some embodiments, the measuring points of the air temperature out of the tower are evenly arranged on any two mutually perpendicular diameters of the throat section of the cooling tower in the form of equal-area rings.

[0006] In some embodiments, the measurement points of the tower inlet air parameters are evenly arranged along the circumferential direction of the air inlet.

[0007] According to a second aspect of the present disclosure, a method for monitoring an outlet density Freund number is provided, characterized in that the method comprises: obtaining test data of an outlet air temperature, an outlet air flow rate and inlet air parameters of a cooling tower; determining an outlet density Freund number of the cooling tower according to the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameters, and outputting the outlet density Freund number of the cooling tower.

[0008] In some embodiments, determining the outlet density Freund number of a cooling tower based on test data of outlet air temperature, outlet air flow rate and inlet air parameters includes: determining the inlet air density and the inlet air humidity of the cooling tower based on test data of inlet air parameters; determining the outlet air density of the cooling tower based on test data of inlet air humidity and outlet air temperature; determining the average outlet air flow rate of the cooling tower outlet section based on test data of outlet air flow rate; determining the outlet density Freund number of the cooling tower based on the inlet air density, outlet air density and the average outlet air flow rate of the cooling tower outlet section.

[0009] In some embodiments, the test data of the inlet air parameters include the inlet air dry-bulb temperature, inlet air relative humidity and atmospheric pressure at each measuring point, and determining the inlet air density and inlet air moisture content of the cooling tower according to the inlet air parameters includes: calculating the average value of the inlet air dry-bulb temperature at each measuring point to obtain a first temperature, calculating the average value of the inlet air relative humidity at each measuring point to obtain a first humidity; obtaining the Kelvin temperature of the first temperature, and calculating the saturated vapor pressure corresponding to the Kelvin temperature according to the Guillory formula; determining the product of the saturated vapor pressure and the first humidity as the pressure corresponding to the water vapor in the inlet humid air; and determining the inlet air density and the inlet air moisture content according to the pressure corresponding to the water vapor in the inlet humid air, the Kelvin temperature and the atmospheric pressure.

[0010] In some embodiments, the test data of the outlet air temperature includes the outlet air dry-bulb temperature of each measuring point. According to the test data of the inlet air moisture content and the outlet air temperature, determining the outlet air density of the cooling tower includes: taking the average of the outlet air dry-bulb temperature of each measuring point to obtain a second temperature; determining the pressure corresponding to the water vapor in the outlet wet air according to the inlet air moisture content and the second temperature; and determining the outlet air density according to the pressure corresponding to the water vapor in the outlet wet air and the atmospheric pressure.

[0011] In some embodiments, the test data of the air flow rate out of the tower includes the air flow rate out of the throat section of the cooling tower at each measuring point, and determining the average air flow rate out of the cooling tower outlet section based on the test data of the air flow rate out of the tower includes: taking the average value of the air flow rate out of the throat section of the cooling tower at each measuring point to obtain a first flow rate; and obtaining the average air flow rate out of the cooling tower outlet section based on the throat diameter, outlet diameter and first flow rate of the cooling tower.

[0012] According to a third aspect of the present disclosure, an electronic device is provided, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the outlet density Freund number monitoring method of the aforementioned second aspect.

[0013] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium storing computer instructions is provided, wherein the computer instructions are used to enable a computer to execute the outlet density Freund number monitoring method of the aforementioned second aspect.

[0014] According to a fifth aspect of the present disclosure, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the method for monitoring the outlet density Freund number as described in the second aspect above.

[0015] According to a sixth aspect of the present disclosure, there is provided a cooling tower, comprising the outlet density Freund number monitoring system as described in the first aspect or the electronic device as described in the third aspect.

[0016] According to an embodiment of the present disclosure, a system and method for monitoring the outlet density Freund number are proposed. The monitoring system is applied to a cooling tower. The monitoring system includes a thermometer, which is used to test the outlet air temperature of the cooling tower, and the measuring point of the outlet air temperature is arranged at the throat of the cooling tower; an impeller anemometer, which is used to test the outlet air flow rate of the cooling tower, and the measuring points of the outlet air flow rate and the outlet air temperature are arranged in the same manner; a meteorological station, which is used to test the inlet air parameters of the cooling tower, and the measuring points of the inlet air parameters are arranged at the air inlet of the cooling tower; a data acquisition card, which is connected to the air intake through a data line The system and method are connected to an image station, a thermometer and an impeller anemometer, the data acquisition card is used to collect and convert the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameters, and transmit them to the industrial computer; and the industrial computer is connected to the data acquisition card through a data line, the industrial computer is used to determine the outlet density Freund number of the cooling tower according to the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameters, and output the outlet density Freund number of the cooling tower. The system and method have a simple structure and are easy to implement, can accurately monitor the outlet density Freund number of the cooling tower, and provide data support for the forecast and protection of the outlet flow state of the cooling tower.

[0017] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure.

[0019] Figure 1 A schematic diagram of a cooling tower outlet flow pattern provided in an embodiment of the present disclosure;

[0020] Figure 2 A schematic diagram of the structure of an outlet density Freund number monitoring system 100 provided in an embodiment of the present disclosure;

[0021] Figure 3 A schematic diagram of the arrangement of an outlet density Freund number monitoring system in a cooling tower provided by an embodiment of the present disclosure;

[0022] Figure 4 A schematic diagram of the arrangement of measuring points for the air temperature and wind speed at the outlet of the tower provided in an embodiment of the present disclosure;

[0023] Figure 5 A schematic diagram of the arrangement of measuring points for tower air parameters provided in an embodiment of the present disclosure;

[0024] Figure 6 A schematic flow chart of a method for monitoring the outlet density Freund number provided in an embodiment of the present disclosure;

[0025] Figure 7 A schematic flow chart of another method for monitoring the outlet density Freund number provided in an embodiment of the present disclosure;

[0026] Figure 8 A schematic block diagram of an example electronic device 400 provided for an embodiment of the present disclosure;

[0027] The outlet density French number monitoring system 100 includes a thermometer 110, an impeller anemometer 120, a weather station 130, a data acquisition card 140, and an industrial computer 150;

[0028] During the test, the thermometer 110 and the impeller anemometer 120 are arranged at the tower outlet air temperature and wind speed measurement point 101; the meteorological station 130 is arranged at the tower inlet air parameter measurement point 102. DETAILED DESCRIPTION

[0029] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0030] The cooling tower outlet flow pattern can be divided into three types, namely, diffusion type, vertical type and contraction type, such as Figure 1As shown. The first is the diffusion type outflow, the pressure inside the cooling tower before the outlet is greater than the external pressure, and the energy loss at the outlet has two parts: one is the outlet kinetic energy, and the other is the pressure energy; the second is the vertical type outflow, the pressure inside the tower before the outlet is equal to the external pressure, and the outlet loss is the outlet kinetic energy; the third is the contraction type, the pressure inside the tower before the outlet is lower than the external pressure, and additional suction is formed at the outlet, which is an ideal outlet flow state, but if the design is not appropriate, the airflow will separate from the tower wall before the tower outlet. When separation occurs, a section of the tower shell will lose its function, causing the effective height to decrease. This separation is also called cold air backflow.

[0031] The flow pattern at the cooling tower outlet is related to the Freund number of the cooling tower outlet. When the Freund number of the cooling tower outlet is less than 0.71, the cold air flows back; when the Freund number of the cooling tower outlet is less than 0.58, the cold air enters 1 / 3 of the outlet diameter of the tower. When the Freund number of the cooling tower outlet is greater than 0.71, the cold air will not flow back. It can be seen that the Freund number of the cooling tower outlet is a key parameter for the operation of the cooling tower. Real-time monitoring of the Freund number of the cooling tower outlet is of great significance for guiding the reasonable and economical operation of the cooling tower. However, the relevant technology has not yet realized the monitoring of the Freund number of the cooling tower outlet density.

[0032] To this end, the present invention proposes a real-time monitoring system and method for the outlet density Freund number. The system and method have a simple structure and are easy to implement. They can accurately monitor the outlet density Freund number of the cooling tower, providing data support for the prediction and protection of the cooling tower outlet flow state.

[0033] A system, method, electronic device and storage medium for monitoring outlet density Freud number according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0034] Figure 2 The structure diagram of an outlet density Freund number monitoring system 100 provided in an embodiment of the present disclosure is shown in FIG. The monitoring system 100 is applied to a cooling tower.

[0035] like Figure 2 As shown, the detection device 100 is composed of a thermometer 110, an impeller anemometer 120, a weather station 130, a data acquisition card 140, an industrial computer 150, etc. The thermometer 110, the impeller anemometer 120, and the weather station 130 are respectively connected to the data acquisition card 140 through a data line, and the data acquisition card 140 is connected to the industrial computer 150 through a data line.

[0036] In some embodiments of the present disclosure, the data acquisition card 140 (Data Acquisition Card, referred to as DAQ card) refers to a hardware device used to acquire, process and convert analog signals (such as temperature, humidity, pressure, etc.) into digital signals.

[0037] In some embodiments of the present disclosure, the industrial computer 150 (Industrial PC, IPC for short) is a computer device designed for an industrial environment.

[0038] In an embodiment of the present disclosure, the detection device is applied to a cooling tower. Figure 3 As shown, Figure 3 A schematic diagram of the arrangement of an outlet density Freund number monitoring system 100 in a cooling tower is provided.

[0039] In the embodiment of the present disclosure, the thermometer 110 is used to test the air temperature of the cooling tower outlet; the impeller anemometer 120 is used to test the air velocity of the cooling tower outlet; the arrangement of the measuring points of the air velocity of the cooling tower outlet is the same as that of the measuring points of the air temperature of the cooling tower outlet, such as Figure 3 As shown, the outlet air temperature and flow rate measuring point 101 is arranged at the throat of the cooling tower. During the test, the thermometer 110 and the impeller anemometer 120 are arranged according to the outlet air temperature and flow rate measuring point 101.

[0040] It should be noted that the air flow rate at the throat of the cooling tower is uniform and is not easily disturbed by the external wind, so the air temperature at the outlet of the cooling tower can be accurately measured.

[0041] In some embodiments of the present disclosure, the outlet air temperature and flow rate measuring points 101 are evenly arranged on any two mutually perpendicular diameters of the throat section of the cooling tower in an equal-area ring manner.

[0042] In some embodiments of the present disclosure, the number of outlet air temperature and flow rate measuring points 101 is not less than 10, and the distance between each outlet air temperature and flow rate measuring point 101 and the center of the throat section of the cooling tower is calculated by the following formula (1):

[0043]

[0044] Among them, R n It represents the distance from the center of the throat section of the cooling tower to each measuring point 101, in m; R represents the radius of the throat of the cooling tower, in m; n represents the number of each measuring point 101 from the center of the throat section of the cooling tower; m represents the number of equal surface rings.

[0045] In one embodiment of the present disclosure, Figure 4 As shown, Figure 4 The circle shown is the throat section of the cooling tower, which is divided into multiple equal-area rings, and the multiple equal-area rings are divided into multiple equal-area regions by any two perpendicular diameters in the throat section of the cooling tower. The outlet air temperature and flow rate measuring point 101 is arranged at the intersection of the equal-area rings and the two perpendicular diameters.

[0046] In some embodiments of the present disclosure, the resolution of the thermometer 110 is not greater than 0.2° C., and the instrument accuracy should not be lower than level 0.5.

[0047] In some embodiments of the present disclosure, the installation direction of the impeller anemometer 120 is perpendicular to the air flow direction; the resolution of the impeller anemometer 120 is not greater than 0.01 m / s, and the instrument accuracy should not be lower than 0.1 m / s.

[0048] In some embodiments of the present disclosure, the weather station 130 is used to test the inlet air parameters of the cooling tower, and the measuring point 102 of the inlet air parameters is arranged at the air inlet of the cooling tower.

[0049] In some embodiments of the present disclosure, Figure 3 As shown, the measuring point 102 of the tower air parameters is arranged at the air inlet of the cooling tower close to the edge of the radiator. For example, the measuring point 102 of the tower air parameters is arranged at a horizontal distance of 1m and a height of 1.5m from the air inlet to the edge of the radiator.

[0050] In some embodiments of the present disclosure, the measuring points 102 of the tower air parameters are evenly arranged along the circumference of the air inlet. Figure 5 As shown, Figure 5 The circle shown is the edge section of the cooling tower radiator, and the measuring points 102 of the tower inlet air parameters are 4 points evenly arranged in the circumferential direction of the air inlet.

[0051] In some embodiments of the present disclosure, the inlet air parameters of the cooling tower include the dry bulb temperature, relative humidity, and atmospheric pressure of the inlet air.

[0052] In some embodiments of the present disclosure, the atmospheric pressure is tested by a pressure gauge with a resolution of 0.1 hPa; the dry-bulb temperature is tested by a thermometer with a resolution of no more than 0.2°C and an instrument accuracy of no less than 0.5 levels; and the relative humidity is tested by a hygrometer with an accuracy range of ±2%.

[0053] In some embodiments of the present disclosure, the thermometer 110, the impeller anemometer 120, and the meteorological station 130 are arranged according to the layout positions of the corresponding measuring points. When the cooling tower is running, the outlet air temperature, outlet air flow rate, and inlet air parameters of the cooling tower are measured in real time.

[0054] In some embodiments of the present disclosure, the thermometer 110, the impeller anemometer 120, and the meteorological station 130 transmit the collected test data of the outgoing air temperature, the outgoing air flow rate, and the ingoing air parameters to the data acquisition card 140 through the data acquisition line, and transmit them to the industrial computer 150 through the data acquisition card 140; the industrial computer 150 calculates and determines the outlet density Freund number of the cooling tower according to the test data of the outgoing air temperature, the outgoing air flow rate, and the ingoing air parameters according to a predefined calculation formula, and outputs the outlet density Freund number of the cooling tower, thereby realizing real-time online monitoring of the outlet density Freund number of the cooling tower.

[0055] In summary, according to the outlet density Freund number monitoring system provided by the present disclosure, the monitoring system is applied to a cooling tower, and the monitoring system includes a thermometer, which is used to test the outlet air temperature of the cooling tower, and the measuring point of the outlet air temperature is arranged at the throat of the cooling tower; an impeller anemometer, which is used to test the outlet air velocity of the cooling tower, and the measuring points of the outlet air velocity and the outlet air temperature are arranged in the same manner; a meteorological station, which is used to test the inlet air parameters of the cooling tower, and the measuring points of the inlet air parameters are arranged at the air inlet of the cooling tower; a data acquisition card, which is connected to the meteorological station through a data line , thermometer and impeller anemometer, the data acquisition card is used to collect and convert the test data of the outlet air temperature, outlet air flow rate and inlet air parameters, and transmit them to the industrial computer; and the industrial computer, the industrial computer is connected to the data acquisition card through a data line, the industrial computer is used to determine the outlet density Freund number of the cooling tower according to the test data of the outlet air temperature, outlet air flow rate and inlet air parameters, and output the outlet density Freund number of the cooling tower. The system has a simple structure and is easy to implement. It can accurately monitor the outlet density Freund number of the cooling tower, and provide data support for the prediction and protection of the outlet flow state of the cooling tower.

[0056] Figure 6 A flow chart of a method for monitoring the outlet density Fresnel number provided in an embodiment of the present disclosure is provided. The method is executed by a processor, such as a processor at the MCU (Microcontroller Unit) level. The method can be used to control the above-mentioned outlet density Fresnel number monitoring system 100 to perform outlet density Fresnel number monitoring.

[0057] like Figure 6 As shown, the method comprises the following steps:

[0058] Step 201, obtaining test data of the outlet air temperature, outlet air flow rate and inlet air parameters of the cooling tower.

[0059] In some embodiments, the test data of the outlet air temperature, outlet air flow rate and inlet air parameters of the cooling tower are obtained by controlling the test equipment.

[0060] In some embodiments, the test data of the air temperature at the outlet of the cooling tower is obtained by controlling the thermometer to measure; the test data of the air flow rate at the outlet of the cooling tower is obtained by controlling the impeller anemometer to measure; and the test data of the air parameters at the inlet are obtained by controlling the meteorological station to measure.

[0061] In some embodiments, the measuring points of the air temperature and wind speed at the outlet of the tower are evenly arranged on any two mutually perpendicular diameters of the throat section of the cooling tower in the form of equal-area rings.

[0062] In some embodiments, there are no less than 10 measuring points for the air temperature and wind speed at the outlet of the tower, that is, there are no less than 10 measurement data for the air temperature and wind speed at the outlet of the tower.

[0063] In some embodiments, the measuring points of the inlet air parameters are evenly arranged in the circumferential direction of the cooling tower air inlet, and the number of the measuring points of the inlet air parameters is more than one, for example, the measuring points of the inlet air parameters are 4 points evenly arranged in the circumferential direction of the air inlet.

[0064] In some embodiments, the method further comprises: converting the test data of the outgoing-tower air temperature, the outgoing-tower air flow rate and the ingoing-tower air parameters from analog signals to digital signals.

[0065] In some embodiments, the test data of the outgoing air temperature, outgoing air flow rate and ingoing air parameters are collected and converted into signals through a data acquisition card, and the test data are converted from analog signals to digital signals so that they can be input into an industrial computer for digital calculation and processing.

[0066] Step 202, determining the outlet density Freund number of the cooling tower according to the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameters, and outputting the outlet density Freund number of the cooling tower.

[0067] In some embodiments, the control industrial computer calculates and outputs the outlet density Freund number of the cooling tower according to the predefined calculation logic based on the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameters.

[0068] In summary, the outlet density Freund number monitoring method provided by the present invention includes: obtaining the test data of the outlet air temperature, outlet air flow rate and inlet air parameters of the cooling tower; determining the outlet density Freund number of the cooling tower according to the test data of the outlet air temperature, outlet air flow rate and inlet air parameters, and outputting the outlet density Freund number of the cooling tower. The method is simple and easy to implement, can accurately monitor the outlet density Freund number of the cooling tower, and provides data support for the prediction and protection of the outlet flow state of the cooling tower.

[0069] based on Figure 6 , Figure 7This is a flow chart of another method for monitoring the outlet density Freund number provided in an embodiment of the present disclosure, wherein steps 302-305 are further disclosures of step 202, namely, further disclosures of a method for determining the outlet density Freund number.

[0070] Step 301, obtaining test data of the outlet air temperature, outlet air flow rate and inlet air parameters of the cooling tower.

[0071] In some embodiments, the test data of the outlet air temperature, outlet air flow rate and inlet air parameters of the cooling tower are obtained by controlling the test equipment.

[0072] In some embodiments, the test data of the air temperature at the outlet of the cooling tower is obtained by controlling the thermometer to measure; the test data of the air flow rate at the outlet of the cooling tower is obtained by controlling the impeller anemometer to measure; and the test data of the air parameters at the inlet are obtained by controlling the meteorological station to measure.

[0073] In some embodiments, the measuring points of the air temperature and wind speed at the outlet of the tower are evenly arranged on any two mutually perpendicular diameters of the throat section of the cooling tower in the form of equal-area rings.

[0074] In some embodiments, the number of measuring points for the air temperature and wind speed at the outlet of the tower is no less than 10, that is, the number of measurement data for the air temperature and wind speed at the outlet of the tower is no less than 10.

[0075] In some embodiments, the measuring points of the inlet air parameters are evenly arranged in the circumferential direction of the cooling tower air inlet, and the number of the measuring points of the inlet air parameters is more than one. For example, the measuring points of the inlet air parameters are 4 points evenly arranged in the circumferential direction of the air inlet.

[0076] In some embodiments, the test data of the outgoing air temperature, outgoing air flow rate and ingoing air parameters are collected and converted into signals through a data acquisition card, and the test data are converted from analog signals to digital signals so that they can be input into an industrial computer for digital calculation and processing.

[0077] Step 302: Determine the density and humidity of the cooling tower's inlet air according to the test data of the inlet air parameters.

[0078] In some embodiments, the test data of the inlet air parameters include the inlet air dry bulb temperature, the inlet air relative humidity and the atmospheric pressure at each measuring point.

[0079] In some embodiments, step 302 includes: calculating the average dry-bulb temperature of the air entering the tower at each measuring point to obtain a first temperature, calculating the average relative humidity of the air entering the tower at each measuring point to obtain a first humidity; obtaining the Kelvin temperature of the first temperature, and calculating the saturated vapor pressure corresponding to the Kelvin temperature according to the Guiley formula; determining the product of the saturated vapor pressure and the first humidity as the pressure corresponding to the water vapor in the wet air entering the tower; determining the density of the air entering the tower and the moisture content of the air entering the tower according to the pressure corresponding to the water vapor in the wet air entering the tower, the Kelvin temperature and the atmospheric pressure.

[0080] In some embodiments, it is assumed that the measurement points of the inlet air parameters are 4 points evenly arranged in the circumferential direction of the air inlet, and the measurement point number is represented by k, where k is a positive integer from 1 to 4. The average value of the inlet air dry bulb temperature of each measurement point is calculated by the following formula (2), and the average value of the inlet air relative humidity of each measurement point is calculated by the following formula (3):

[0081]

[0082] Among them, θ j Indicates the average dry bulb temperature of the air entering the tower, in °C; θ j,k It represents the dry-bulb temperature of the air entering the tower measured at the kth measuring point, in °C. Indicates the average relative humidity of the air entering the tower, in %; It indicates the relative humidity of the air entering the tower measured at the kth measuring point, in %.

[0083] It should be noted that the number of measurement points of the tower inlet air parameters is not limited to 4, that is, k in the formula can be 1-n, n is a positive integer, and the present disclosure is not limited thereto.

[0084] In some embodiments, the average dry bulb temperature of the air entering the tower is obtained. j The Kelvin temperature is 273.15+θ j , the saturated vapor pressure corresponding to the K temperature is calculated by the Guiley formula, as shown in the following formula (4):

[0085]

[0086] Where, T represents Kelvin temperature, the unit is K; P" v Indicates the saturated steam pressure corresponding to temperature T, in units of 10 5 Pa.

[0087] In some embodiments, the saturated vapor pressure P" corresponding to the K temperature v Average relative humidity of air entering the tower The product of is determined as the pressure corresponding to the water vapor in the wet air entering the tower, as shown in the following formula (5):

[0088]

[0089] Among them, p v It indicates the pressure corresponding to the water vapor in the wet air entering the tower, in Pa.

[0090] In some embodiments, determining the density of the air entering the tower according to the pressure corresponding to the water vapor in the wet air entering the tower, the K temperature and the atmospheric pressure includes: obtaining the difference between the atmospheric pressure and the pressure corresponding to the water vapor in the wet air entering the tower; taking the ratio of the product of the dry air gas constant and the K temperature to the difference as the density of the dry air entering the tower; taking the ratio of the pressure corresponding to the water vapor in the wet air entering the tower to the product of the water vapor gas constant and the K temperature as the density of the wet air entering the tower; and determining the sum of the density of the dry air entering the tower and the density of the wet air entering the tower as the density of the air entering the tower, as shown in the following formula (6):

[0091]

[0092] Among them, ρ a Indicates the density of air entering the tower, in kg / m3; p a Indicates atmospheric pressure, in Pa; R d Represents the gas constant of dry air, which is 287.14 J / (kg·K); R v Represents the water vapor gas constant, which is 461.53 J / (kg·K).

[0093] In some embodiments, the difference between the atmospheric pressure and the pressure corresponding to the water vapor in the wet air entering the tower is obtained; the ratio of the pressure corresponding to the water vapor in the wet air entering the tower to the difference is used as the moisture content of the air entering the tower, and the specific calculation is shown in the following formula (7):

[0094]

[0095] Among them, X j Indicates the humidity content of the air entering the tower.

[0096] Step 303, determining the density of the air out of the cooling tower according to the test data of the humidity content of the air entering the tower and the temperature of the air out of the tower.

[0097] In some embodiments, the test data of the air temperature at the outlet of the tower includes the dry-bulb temperature of the air at the outlet of the tower at each measuring point.

[0098] In some embodiments, according to the test data of the inlet air humidity content and the outlet air temperature, determining the outlet air density of the cooling tower includes: taking the average of the outlet air dry-bulb temperature of each measuring point to obtain a second temperature; determining the pressure corresponding to the water vapor in the outlet wet air according to the inlet air humidity content and the second temperature; determining the outlet air density according to the pressure corresponding to the water vapor in the outlet wet air and the atmospheric pressure.

[0099] In some embodiments, the number of the measuring point of the air temperature at the outlet of the tower is represented by k, where k is 1-n and n is a positive integer. The average value of the dry-bulb temperature of the air at the outlet of the tower at each measuring point is calculated by the following formula (8):

[0100]

[0101] Among them, θ o Indicates the average dry bulb temperature of the tower air in °C; θ o,k It represents the dry-bulb temperature of the air leaving the cooling tower at the kth measuring point, ℃.

[0102] In some embodiments, the cooling tower is an air-cooled cooling tower, and the humidity content of the air entering and leaving the tower is the same. The pressure corresponding to the water vapor in the wet air in the tower can be calculated based on the inlet humidity content and the dry bulb temperature of the air leaving the tower. The specific calculation formula is shown in the following formula (9):

[0103]

[0104] Among them, p o The pressure corresponding to the water vapor in the wet air leaving the tower, in Pa; p a represents atmospheric pressure, X j Indicates the humidity content of the air entering the tower.

[0105] In some embodiments, determining the density of the air out of the tower according to the pressure corresponding to the water vapor in the wet air out of the tower and the atmospheric pressure includes: obtaining the average dry bulb temperature θ of the air out of the tower o The Kelvin temperature is 273.15+θ o ; Obtain the difference between the atmospheric pressure and the pressure corresponding to the water vapor in the wet air leaving the tower; Take the ratio of the product of the dry air gas constant and the K temperature to the difference as the dry air density leaving the tower; Take the ratio of the pressure corresponding to the water vapor in the wet air leaving the tower to the product of the water vapor gas constant and the K temperature as the wet air density leaving the tower; Determine the sum of the dry air density leaving the tower and the wet air density leaving the tower as the air density leaving the tower, as shown in the following formula (10):

[0106]

[0107] Among them, ρ o Indicates the tower air density in kg / m 3 ;p a Indicates atmospheric pressure, in Pa; R d Represents the gas constant of dry air, which is 287.14 J / (kg·K); R v Represents the water vapor gas constant, which is 461.53 J / (kg·K).

[0108] Step 304, determining the average outflow velocity of the cooling tower outlet air at the cooling tower outlet section according to the test data of the outflow velocity of the cooling tower air.

[0109] In some embodiments, the test data of the out-tower air flow rate includes the out-tower air flow rate of the throat section of the cooling tower at each measuring point.

[0110] In some embodiments, determining the average air flow rate of the outlet section of the cooling tower based on the test data of the air flow rate includes: calculating the average air flow rate of the throat section of the cooling tower at each measuring point to obtain a first flow rate; and obtaining the average air flow rate of the outlet section of the cooling tower based on the throat diameter, outlet diameter and first flow rate of the cooling tower.

[0111] In some embodiments, the measuring points of the air flow rate out of the tower are arranged at the throat of the cooling tower, and the measuring points are numbered as k, where k is 1-n and n is a positive integer. The average value of the air flow rate out of the throat section of the cooling tower at each measuring point is calculated by the following formula (11):

[0112]

[0113] Among them, V o It indicates the average air velocity out of the tower at the throat section, in m / s; V o,k It indicates the average air velocity out of the cooling tower at the kth measuring point, in m / s.

[0114] In some embodiments, based on the air flow rate at the throat section being equal to the air flow rate at the tower outlet, the average air flow rate at the cooling tower outlet section can be determined by the following formula (12):

[0115]

[0116] Among them, V e It indicates the average air velocity at the outlet section of the cooling tower, in m / s; D h Indicates the throat diameter of the cooling tower, in m; D c Indicates the cooling tower outlet diameter in meters.

[0117] Step 305, determining the outlet density Freund number of the cooling tower according to the inlet air density, the outlet air density and the average outlet air flow rate of the outlet section of the cooling tower.

[0118] In some embodiments, determining the outlet density Freund number of the cooling tower according to the inlet air density, the outlet air density and the average outlet air flow rate of the cooling tower outlet section includes: obtaining the ratio of the difference between the inlet air density and the outlet air density to the outlet air density, which can reflect the degree of change of the air density in the tower; calculating the product of the ratio, the gravitational acceleration and the cooling tower outlet diameter as the first product; calculating the product of the average outlet air flow rate of the cooling tower outlet section and the turbulent mixing coefficient as the second product; and obtaining the square root of the ratio of the second product to the first product to obtain the outlet density Freund number. The specific calculation formula is shown in the following formula (13):

[0119]

[0120] Among them, F Δ represents the outlet density Freund number; ε represents the turbulent mixing coefficient, which is 0.1; g represents the gravitational acceleration, which is 9.8 m / s 2 .

[0121] In some embodiments, the test data of the outlet air temperature, outlet air flow rate and inlet air parameters of the cooling tower are obtained by controlling the test equipment, and the test data are transmitted to the data acquisition card in real time through the data acquisition line, and then transmitted to the industrial computer through the data acquisition card. The cooling tower outlet density Freund number is calculated according to the above formulas (2)-(13), thereby realizing real-time online monitoring of the cooling tower outlet density Freund number.

[0122] In summary, the outlet density Freund number monitoring method provided by the present invention includes: obtaining the test data of the outlet air temperature, outlet air flow rate and inlet air parameters of the cooling tower; determining the inlet air density and the inlet air humidity of the cooling tower according to the test data of the inlet air parameters; determining the outlet air density of the cooling tower according to the test data of the inlet air humidity and the outlet air temperature; determining the average outlet air flow rate of the cooling tower outlet section according to the test data of the outlet air flow rate; determining the outlet density Freund number of the cooling tower according to the inlet air density, the outlet air density and the average outlet air flow rate of the cooling tower outlet section. The method is simple and easy to implement, can accurately monitor the outlet density Freund number of the cooling tower, and provides data support for the prediction and protection of the outlet flow state of the cooling tower.

[0123] Figure 8A schematic block diagram of an example electronic device 400 that can be used to implement an embodiment of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present disclosure described and / or required herein.

[0124] like Figure 8 As shown, the device 400 includes a computing unit 401, which can perform various appropriate actions and processes according to a computer program stored in a ROM (Read-Only Memory) 402 or a computer program loaded from a storage unit 408 to a RAM (Random Access Memory) 403. In the RAM 403, various programs and data required for the operation of the device 400 can also be stored. The computing unit 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An I / O (Input / Output) interface 405 is also connected to the bus 404.

[0125] A number of components in the device 400 are connected to the I / O interface 405, including: an input unit 406, such as a keyboard, a mouse, etc.; an output unit 407, such as various types of displays, speakers, etc.; a storage unit 408, such as a disk, an optical disk, etc.; and a communication unit 409, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 409 allows the device 400 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0126] The computing unit 401 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a CPU (Central Processing Unit), a GPU (Graphic Processing Units), various dedicated AI (Artificial Intelligence) computing chips, various computing units running machine learning model algorithms, a DSP (Digital Signal Processor), and any appropriate processor, controller, microcontroller, etc. The computing unit 401 performs the various methods and processes described above, such as the method for adjusting the color temperature. For example, in some embodiments, the method for adjusting the color temperature may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 408. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 400 via the ROM 402 and / or the communication unit 409. When the computer program is loaded into the RAM 403 and executed by the computing unit 401, one or more steps of the method described above may be performed. Alternatively, in other embodiments, the computing unit 401 may be configured to execute the aforementioned color temperature adjustment method in any other appropriate manner (for example, by means of firmware).

[0127] Various embodiments of the systems and techniques described above herein may be implemented in digital electronic detection device systems, integrated detection device systems, FPGAs (Field Programmable Gate Arrays), ASICs (Application-Specific Integrated Circuits), ASSPs (Application-Specific Standard Products), SOCs (System On Chips), CPLDs (Complex Programmable Logic Devices), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs, which may be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, which may receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0128] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0129] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include electrical connections based on one or more lines, portable computer disks, hard disks, RAM, ROM, EPROM (Electrically Programmable Read-Only-Memory) or flash memory, optical fiber, CD-ROM (Compact Disc Read-Only Memory), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0130] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (Cathode-Ray Tube) or LCD (Liquid Crystal Display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0131] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: LAN (Local Area Network), WAN (Wide Area Network), the Internet, and blockchain networks.

[0132] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship between the client and the server is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services ("Virtual Private Server", or "VPS" for short). The server may also be a server of a distributed system, or a server combined with a blockchain.

[0133] It should be noted that artificial intelligence is a discipline that studies how computers can simulate certain human thought processes and intelligent behaviors (such as learning, reasoning, thinking, planning, etc.), and includes both hardware-level and software-level technologies. Artificial intelligence hardware technologies generally include technologies such as sensors, dedicated artificial intelligence chips, cloud computing, distributed storage, and big data processing; artificial intelligence software technologies mainly include computer vision technology, speech recognition technology, natural language processing technology, as well as machine learning / deep learning, big data processing technology, knowledge graph technology, and other major directions.

[0134] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0135] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An outlet density Freund number monitoring system, the monitoring system is applied to a cooling tower, characterized in that: The monitoring system comprises: A thermometer, the thermometer is used to test the air temperature of the outlet air of the cooling tower, and the measuring point of the air temperature of the outlet air is arranged at the throat of the cooling tower; An impeller anemometer, the impeller anemometer is used to test the outlet air velocity of the cooling tower, and the measuring points of the outlet air velocity and the outlet air temperature are arranged in the same manner; A meteorological station, wherein the meteorological station is used to test the air parameters of the cooling tower, and the measuring points of the air parameters of the cooling tower are arranged at the air inlet of the cooling tower; A data acquisition card, the data acquisition card is connected to the weather station, the thermometer and the impeller anemometer through data lines, and the data acquisition card is used to collect and convert the test data of the tower outlet air temperature, the tower outlet air flow rate and the tower inlet air parameters, and transmit them to the industrial computer; And the industrial computer is connected to the data acquisition card through a data line, and the industrial computer is used to determine the outlet density Freund number of the cooling tower according to the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameters, and output the outlet density Freund number of the cooling tower.

2. The monitoring system according to claim 1, characterized in that: The measuring points of the air temperature at the outlet of the tower are evenly arranged on any two mutually perpendicular diameters of the throat section of the cooling tower in the form of equal-area rings.

3. The monitoring system according to claim 2, characterized in that: The measuring points of the tower inlet air parameters are evenly arranged along the circumferential direction of the air inlet.

4. A method for monitoring the density Freund number at a cooling tower outlet, characterized in that: The method comprises: Obtain the test data of the cooling tower's outlet air temperature, outlet air velocity, and inlet air parameters; The outlet density Freund number of the cooling tower is determined according to the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameters, and the outlet density Freund number of the cooling tower is output.

5. The method according to claim 4, characterized in that The method of determining the outlet density Freund number of the cooling tower according to the test data of the outlet air temperature, the outlet air flow rate and the inlet air parameter comprises: Determining the inlet air density and the inlet air humidity of the cooling tower according to the test data of the inlet air parameters; Determine the air density of the cooling tower outlet according to the test data of the air humidity of the inlet air and the air temperature of the outlet air; Determine the average outflow velocity of the cooling tower air at the outlet section according to the test data of the outflow velocity of the cooling tower air; The outlet density Freund number of the cooling tower is determined according to the inlet air density, the outlet air density and the average outlet air flow rate of the cooling tower outlet section.

6. The method according to claim 5, characterized in that The test data of the inlet air parameters include the inlet air dry bulb temperature, inlet air relative humidity and atmospheric pressure at each measuring point. The inlet air density and inlet air moisture content of the cooling tower are determined according to the inlet air parameters. Calculate the average dry-bulb temperature of the air entering the tower at each measuring point to obtain a first temperature, and calculate the average relative humidity of the air entering the tower at each measuring point to obtain a first humidity; Obtaining the Kelvin temperature of the first temperature, and calculating the saturated vapor pressure corresponding to the Kelvin temperature according to the Guillory formula; Determine the product of the saturated vapor pressure and the first humidity as the pressure corresponding to the water vapor in the wet air entering the tower; The density of the air entering the tower and the moisture content of the air entering the tower are determined according to the pressure corresponding to the water vapor in the wet air entering the tower, the Kelvin temperature and the atmospheric pressure.

7. The method according to claim 6, characterized in that The test data of the outlet air temperature includes the outlet air dry bulb temperature of each measuring point. The determination of the outlet air density of the cooling tower according to the test data of the inlet air moisture content and the outlet air temperature includes: Calculate the average dry-bulb temperature of the air out of the tower at each measuring point to obtain a second temperature; Determine the pressure corresponding to the water vapor in the wet air leaving the tower according to the moisture content of the air entering the tower and the second temperature; The density of the air leaving the tower is determined according to the pressure corresponding to the water vapor in the wet air leaving the tower and the atmospheric pressure.

8. The method according to claim 5, characterized in that The test data of the out-tower air flow rate includes the out-tower air flow rate of the throat section of the cooling tower at each measuring point, and the determination of the average out-tower air flow rate of the cooling tower outlet section according to the test data of the out-tower air flow rate includes: Calculate the average of the air flow rates out of the cooling tower throat section at each measuring point to obtain a first flow rate; According to the throat diameter, outlet diameter and the first flow rate of the cooling tower, the average flow rate of the air out of the cooling tower outlet section is obtained.

9. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 4 to 8.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to cause the computer to execute the method according to any one of claims 4-8.

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