Intelligent control system and method for concrete dam water cooling in cold region

Abstract

The application discloses a kind of cold region concrete dam water cooling intelligent control system and method, system includes: low temperature water tank, inside installation is measured with first thermometer water temperature, low temperature water tank connects the one end of first pipeline, first pipeline is installed with first flowmeter and first solenoid valve;High temperature water tank, inside installation is measured with second thermometer water temperature, high temperature water tank connects the one end of second pipeline, second pipeline is installed with second flowmeter and second solenoid valve;The other end of first pipeline and second pipeline is connected with third pipeline through tee joint, third pipeline is installed third flowmeter and third thermometer.The application can accurately control the flow and temperature of cooling water, which is applied in the construction process of concrete dam, to ensure the temperature control measures of concrete construction.

Description

Technical Field

[0001] This invention relates to the field of cooling concrete dams in cold regions, specifically to an intelligent control system and method for water cooling of concrete dams in cold regions. Background Technology

[0002] In cold regions, water cooling of concrete dams is a crucial temperature control measure for preventing cracking during concrete construction. The water temperature is a key factor in ensuring effective cooling and meeting concrete temperature control standards. However, in actual projects, environmental factors and changes in concrete temperature often lead to water temperatures in the cooling pipes exceeding design values ​​and fluctuating continuously. This has little effect on controlling the maximum concrete temperature, and subsequent temperature adjustments are irreversible due to the inability to control the maximum concrete temperature, thus increasing the risk of internal cracking. Consequently, it frequently occurs that even after water cooling, the controlled temperature cannot be reached. Summary of the Invention

[0003] The purpose of this invention is to provide an intelligent control system for water cooling of concrete dams in cold regions, which can accurately control the water cooling flow rate and water temperature during the construction of concrete dams.

[0004] Another objective of this invention is to provide an intelligent control method for water cooling of concrete dams in cold regions, which can accurately control the flow rate and temperature of cooling water according to the temperature change requirements of the concrete during the construction of the concrete dam, thereby ensuring the temperature control measures for concrete construction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A smart control system for water cooling of concrete dams in cold regions, the system comprising: A low-temperature water tank is equipped with a first thermometer for measuring water temperature. The low-temperature water tank is connected to one end of a first pipeline, and a first flow meter and a first solenoid valve are installed on the first pipeline. A high-temperature water tank is equipped with a second thermometer for measuring water temperature. One end of the high-temperature water tank is connected to a second pipe, and a second flow meter and a second solenoid valve are installed on the second pipe. The other ends of the first and second pipes are connected to a third pipe via a tee, and a third flow meter and a third thermometer are installed on the third pipe.

[0006] A method for intelligent control of water cooling in concrete dams in cold regions, applied to the aforementioned intelligent control system for water cooling in concrete dams in cold regions, the method comprising: Step S1: Obtain the boundary characteristics, temperature characteristics, and mechanical characteristics of the concrete dam; Step S2: Construct a numerical simulation model of the concrete dam based on the boundary features; Step S3: Based on the numerical simulation model and according to the temperature and mechanical characteristics, obtain the optimal stress-temperature process line of the concrete dam; Step S4: Obtain the target temperature of the current concrete based on the optimal stress-temperature process line; Step S5: Obtain the required cooling water temperature and cooling water flow rate for the current concrete based on the target temperature; Step S6: Based on the required cooling water temperature and flow rate of the current concrete, obtain the flow rate Q corresponding to the first pipe using the following formula. c The flow rate Q corresponding to the second pipe h :

[0007] Among them, T c T represents the water temperature in the low-temperature water tank. h The water temperature in the high-temperature water tank, T m Q represents the required cooling water temperature for the current concrete. m The required cooling water flow rate for the current concrete; Step S7: Based on the traffic Q c and traffic Q h Control the opening degree of the first flow meter and the second flow meter.

[0008] Furthermore, the step of "obtaining the required cooling water temperature and cooling water flow rate for the current concrete based on the target temperature" includes: The required cooling water temperature and flow rate for the current concrete are obtained using the method shown in the formula below:

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015] In the formula: T w T represents the required cooling water temperature for the current concrete, and T represents the target temperature of the current concrete. For age-related adiabatic temperature rise, For maintenance age, The initial temperature of the concrete. The water cooling time for the concrete is denoted as 'a', where 'a' is the thermal conductivity of the concrete. Let λ be the cooling diameter of the concrete, λ1 be the thermal conductivity of the concrete, λ1 be the thermal conductivity of the cooling water pipe, c be the outer radius of the cooling water pipe, r0 be the inner radius of the cooling water pipe, s be the distance between adjacent cooling water pipes, π be pi, and q be the diameter of the circumference of the pipe. w The required cooling water flow rate for the current concrete. c is the length of the cooling water pipe for the concrete. w For the specific heat of cooling water, ρ w For the density of cooling water, This is the preset equivalent thermal conductivity of the cooling water.

[0016] Furthermore, "based on the traffic Q" c and traffic Q h The steps of "controlling the opening degree of the first flow meter and the second flow meter" include: Obtain the flow rate change values ​​corresponding to the first and second pipes using the method shown in the following formula;

[0017] in, This represents the change in flow rate in the first pipe. The initial flow rate of the first pipe is... This represents the change in flow rate in the second pipe. This represents the initial flow rate of the second pipe; Based on the flow rate change values ​​corresponding to the first and second pipes, the opening change of the first and second flow meters is obtained; The opening degree of the first flow meter and the second flow meter is controlled based on the change in the opening degree of the first flow meter and the second flow meter.

[0018] Further, steps S4 to S7 are repeated to make the current temperature of the concrete conform to the optimal stress-temperature process line.

[0019] The advantages of this invention are: The intelligent control system for water cooling of concrete dams in cold regions provided by this invention can accurately control the water cooling flow rate and water temperature during the construction of concrete dams.

[0020] The present invention provides an intelligent control method for water cooling of concrete dams in cold regions, which can accurately control the flow rate and temperature of cooling water according to the temperature change requirements of concrete during the construction of concrete dams, and ensure the temperature control measures of concrete construction. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of an intelligent control system for water cooling of concrete dams in cold regions. Figure 2 This is a schematic diagram of the main process of a smart control method for water cooling of concrete dams in cold regions. Detailed Implementation

[0022] See appendix Figure 1 , Figure 1 An exemplary illustration shows the main structure of a smart control system for water cooling of a concrete dam in a cold region. For example... Figure 1 As shown, the intelligent control system for water cooling of concrete dams in cold regions provided in this embodiment includes a low-temperature water tank 1, a high-temperature water tank 2, a first pipeline 3, a second pipeline 4, and a third pipeline 5. The low-temperature water tank 1 stores water at a lower temperature, while the high-temperature water tank 2 stores water at a higher temperature. The cooling water used for cooling the concrete is obtained by mixing the two types of water at different temperatures in a certain proportion. It is understood that the water in the low-temperature water tank 1 is at a lower temperature than the required cooling water, while the water in the high-temperature water tank 2 is at a higher temperature than the required cooling water.

[0023] The system comprises two pipes: a low-temperature water tank 1, a high-temperature water tank 2, and a high-temperature water tank 3. The high-temperature water tank 2 is connected to a high-temperature water tank 4, which is also connected to a high-temperature water tank 5. The high-temperature water tank 2 is connected to a high-temperature water tank 6, which is connected to a high-temperature water tank 4. The high-temperature water tank 2 is connected to a high-temperature water tank 4, which is connected to a high-temperature water tank 5. The high-temperature water tank 6 is connected to a high-temperature water tank 4, which is connected to a high-temperature water tank 5. The high-temperature water tank 6 is connected to a high-temperature water tank 6, which is connected to a high-temperature water tank 7. The high-temperature water tank 6 is connected to a high-temperature water tank 7, which is connected to a high-temperature water tank 8. The high-temperature water tank 6 is connected to a high-temperature water tank 9, which is connected to a high-temperature water tank 8. The high-temperature water tank 6 is connected to a high-temperature water tank 9, which is connected to a high-temperature water tank 8. The high-temperature water tank 6 is connected to a high-temperature water tank 9, which is connected to a high-temperature water tank 8. The high-temperature water tank 6 is connected to a high-temperature water tank 9. The high-temperature water tank 6 ...

[0024] See appendix Figure 2 , Figure 2 This paper exemplifies the main process of a smart control method for water cooling of concrete dams in cold regions. This method, applied to the aforementioned smart control system for water cooling of concrete dams in cold regions, specifically includes the following steps: Step S1: Obtain the boundary features, temperature features, and mechanical features of the concrete dam. Specifically, the concrete dam is the structure to be poured. The boundary features of the concrete dam are its geometric dimensions to facilitate the construction of a numerical simulation model. The temperature features of the concrete dam include at least the adiabatic temperature rise, thermal conductivity, and surface heat dissipation coefficient of the concrete material. The mechanical features of the concrete dam include at least the elastic modulus, hardening coefficient, and tensile strength of the concrete material.

[0025] Step S2: Construct a numerical simulation model of the concrete dam based on boundary features. This involves using software to construct a numerical simulation model of the concrete dam.

[0026] Step S3: Obtain the optimal stress-temperature process line of the concrete dam based on the numerical simulation model and according to the temperature and mechanical characteristics. That is, calculate the optimal stress-temperature process line of the concrete dam using the numerical simulation model and based on the temperature and mechanical characteristics.

[0027] Step S4: Obtain the target temperature of the concrete at the current time based on the optimal stress-temperature process line. That is, the target temperature required for the concrete at the current time point can be determined through the optimal stress-temperature process line.

[0028] Step S5: Obtain the required cooling water temperature and flow rate for the current concrete based on the target temperature. Specifically, obtain the required cooling water temperature and flow rate for the current concrete using the methods shown in formulas (1) to (7): (1) (2) (3) (4) (5) (6) (7) In the formula: T w T represents the required cooling water temperature for the current concrete, and T represents the target temperature of the current concrete. For age-related adiabatic temperature rise, For maintenance age, The initial temperature of the concrete. The water cooling time for the concrete is denoted as 'a', where 'a' is the thermal conductivity of the concrete. Let λ be the cooling diameter of the concrete, λ be the thermal conductivity of the concrete, and λ1 be the thermal conductivity of the cooling water pipe. Let be the cooling radius, c be the outer radius of the cooling water pipe, r0 be the inner radius of the cooling water pipe, s be the distance between adjacent cooling water pipes, π be pi, and q be the radius of the cooling water pipe. w The required cooling water flow rate for the current concrete. c is the length of the cooling water pipe for the concrete. w For the specific heat of cooling water, ρ w For the density of cooling water, This is the preset equivalent thermal conductivity of the cooling water. It should be noted that the cooling water pipe is a water pipe pre-embedded in the concrete for water cooling, while the cooling water temperature and flow rate required for the current concrete as calculated in the above formula correspond to the water temperature and flow rate of the third pipe.

[0029] Step S6: Based on the current required cooling water temperature and cooling water flow rate of the concrete, obtain the flow rate Q corresponding to the first pipe using formula (8). c The flow rate Q corresponding to the second pipe h .

[0030] (8) Among them, T c T represents the water temperature in the low-temperature water tank. h The water temperature in the high-temperature water tank, T m Q represents the cooling water temperature required for the current concrete, which is also the cooling water temperature corresponding to the third pipe. m This is the cooling water flow rate required for the current concrete flow, which is also the cooling water flow rate corresponding to the third pipe.

[0031] Step S7: Based on traffic Q c and traffic Q h Control the opening degree of the first flow meter and the second flow meter. Obtain the flow change value corresponding to the first pipe and the second pipe according to the method shown in formula (9); (9) in, This represents the change in flow rate in the first pipe. The initial flow rate of the first pipe is... This represents the change in flow rate in the second pipe. This represents the initial flow rate of the second pipe.

[0032] Based on the flow rate change values ​​corresponding to the first and second pipes, the opening change of the first and second flow meters is obtained.

[0033] The opening of the first and second flow meters is controlled based on the changes in their opening.

[0034] Step S8: Repeat steps S4 to S7 to ensure that the current temperature of the concrete conforms to the optimal stress-temperature process line. Specifically, after the above steps, cooling water with precise flow rate and temperature flows into the concrete slab, thereby changing the concrete temperature. Repeat steps S4 to S7 to ensure that the temperature change process of the concrete conforms to the optimal stress-temperature process line, thus ensuring the safety of the concrete dam.

[0035] The above description describes the preferred embodiments of the present invention and the technical principles applied thereto. For those skilled in the art, any obvious changes such as equivalent transformations or simple substitutions based on the technical solutions of the present invention, without departing from the spirit and scope of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A method for intelligent control of water cooling in concrete dams in cold regions, applied to an intelligent control system for water cooling in concrete dams in cold regions, characterized in that... The system includes: A low-temperature water tank is equipped with a first thermometer for measuring water temperature. The low-temperature water tank is connected to one end of a first pipeline, and a first flow meter and a first solenoid valve are installed on the first pipeline. A high-temperature water tank is equipped with a second thermometer for measuring water temperature. One end of the high-temperature water tank is connected to a second pipe, and a second flow meter and a second solenoid valve are installed on the second pipe. The other ends of the first and second pipes are connected to a third pipe via a tee. A third flow meter and a third thermometer are installed on the third pipe. The low-temperature water tank stores water at a lower temperature, and the high-temperature water tank stores water at a higher temperature. The water in the low-temperature water tank is at a lower temperature than the cooling water to be prepared, while the water in the high-temperature water tank is at a higher temperature than the cooling water to be prepared. The method includes: Step S1: Obtain the boundary characteristics, temperature characteristics, and mechanical characteristics of the concrete dam; Step S2: Construct a numerical simulation model of the concrete dam based on the boundary features; Step S3: Based on the numerical simulation model and according to the temperature and mechanical characteristics, obtain the optimal stress-temperature process line of the concrete dam; Step S4: Obtain the target temperature of the current concrete based on the optimal stress-temperature process line; Step S5: Obtain the required cooling water temperature and cooling water flow rate for the current concrete based on the target temperature; Step S6: Based on the required cooling water temperature and flow rate of the current concrete, obtain the flow rate Q corresponding to the first pipe using the following formula. c The flow rate Q corresponding to the second pipe h : Among them, T c T represents the water temperature in the low-temperature water tank. h The water temperature in the high-temperature water tank, T m Q represents the required cooling water temperature for the current concrete. m The required cooling water flow rate for the current concrete; Step S7: Based on the traffic Q c and traffic Q h Control the opening degree of the first flow meter and the second flow meter.

2. The intelligent control method for water cooling of concrete dams in cold regions as described in claim 1, characterized in that, Based on the traffic Q c and traffic Q h The steps of "controlling the opening degree of the first flow meter and the second flow meter" include: Obtain the flow rate change values ​​corresponding to the first and second pipes using the method shown in the following formula; in, This represents the change in flow rate in the first pipe. The initial flow rate of the first pipe is... This represents the change in flow rate in the second pipe. This represents the initial flow rate of the second pipe; Based on the flow rate change values ​​corresponding to the first and second pipes, the opening change of the first and second flow meters is obtained; The opening degree of the first flow meter and the second flow meter is controlled based on the change in the opening degree of the first flow meter and the second flow meter.

3. The intelligent control method for water cooling of concrete dams in cold regions as described in claim 1, characterized in that, Repeat steps S4 to S7 to make the current temperature of the concrete conform to the optimal stress-temperature process line.

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