Large-volume concrete temperature cooling system

Abstract

The utility model provides a mass concrete temperature cooling system, which relates to the technical field of building construction and comprises a cooling pipe, an air cooling tower, a cooling-water machine, a cold water tank, a pump station and a temperature control main station. The cooling pipe is pre-buried in large-volume concrete and is used for heat exchange of the large-volume concrete; the output end of the cooling pipe is connected with the input end of the air cooling tower, the input end of the water cooling machine is connected with the output end of the air cooling tower, and the input end of the cold water tank is connected with the output end of the water cooling machine; the pump station comprises a hot water pump and a cold water pump; the input end of the hot water pump is connected with the bottom of the air cooling tower, and the input end of the cold water pump is connected with the output end of the cold water tank; the output ends of the hot water pump and the cold water pump are connected with the input end of the temperature control main station; and the output end of the temperature control main station is connected with the input end of the cooling pipe.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a large-volume concrete temperature cooling system. Background Technology

[0002] Mass concrete construction is very common in the construction industry, especially in the construction of large infrastructure projects such as dams, bridges, nuclear power plants, and high-rise building foundations. However, mass concrete faces a series of temperature-related challenges during pouring and hardening because the cement hydration reaction in concrete is an exothermic process that generates a large amount of heat. The heat of cement hydration causes a rapid increase in the internal temperature of the concrete, while the surface dissipates heat more quickly, resulting in a large temperature difference between the inside and outside of the concrete. This temperature difference generates significant thermal stress. When this stress exceeds the tensile strength of the concrete, cracks can easily form inside or on the surface, severely affecting the integrity, durability, and load-bearing capacity of the mass concrete structure. To effectively control the internal and external temperature difference, real-time monitoring of the temperature of the mass concrete is essential. In response, the national standard GB / T 51028-2015, "Technical Specification for Temperature Measurement and Control of Mass Concrete," has been issued.

[0003] Currently, traditional temperature control devices for large-volume concrete have several drawbacks in practical applications. On the one hand, they suffer from low cooling efficiency and inaccurate temperature control, which fails to meet the requirements of large-volume concrete construction in modern large-scale building projects. On the other hand, in areas with scarce water resources, traditional temperature control devices for large-volume concrete have low water utilization rates, which not only wastes a lot of water resources but also has a certain impact on environmental emissions. Utility Model Content

[0004] The purpose of this utility model is to provide a large-volume concrete temperature cooling system to solve the technical problems of "traditional large-volume concrete temperature control devices having problems such as low cooling efficiency and inaccurate temperature control in practical applications, thus failing to meet the requirements of large-volume concrete construction in modern large-scale building projects, and in water-scarce areas, traditional large-volume concrete temperature control devices have low water resource utilization rates, which not only wastes a lot of water resources, but also has a certain impact on environmental emissions".

[0005] The technical solution adopted in this utility model is:

[0006] A large-volume concrete temperature cooling system includes cooling pipes, an air-cooled cooling tower, a chiller, a cold water tank, a pump station, and a temperature control master station;

[0007] The cooling pipe is embedded in the large volume concrete for heat exchange of the large volume concrete; the output end of the cooling pipe is connected to the input end of the air-cooled cooling tower, the input end of the chiller is connected to the output end of the air-cooled cooling tower, and the input end of the cold water tank is connected to the output end of the chiller.

[0008] The pumping station includes hot water pumps and cold water pumps;

[0009] The hot water pump input is connected to the bottom of the air-cooled cooling tower, and the cold water pump input is connected to the cold water tank output.

[0010] The output terminals of the hot water pump and the cold water pump are connected to the input terminal of the temperature control master station;

[0011] The output terminal of the temperature control master station is connected to the input terminal of the cooling pipe.

[0012] In a preferred embodiment, the pumping station further includes a backup pump and pipelines;

[0013] The backup water pump is located between the hot water pump and the cold water pump. The input end of the backup water pump is connected to the input ends of the hot water pump and the cold water pump through the pipe, and the output end of the backup water pump is connected to the output ends of the hot water pump and the cold water pump through the pipe.

[0014] In a preferred embodiment, the pipeline is equipped with several gate valves, which are respectively installed near the input end of the standby water pump and the input ends of the hot water pump and the cold water pump, and respectively near the output end of the standby water pump and the output ends of the hot water pump and the cold water pump.

[0015] In a preferred embodiment, the temperature control master station includes a cold water buffer tank, a hot water buffer tank, a high-precision proportional valve, and a control box;

[0016] The input end of the cold water buffer tank is connected to the output end of the cold water pump, and the input end of the hot water buffer tank is connected to the output end of the hot water pump.

[0017] The input terminals of the high-precision proportional valve are respectively located at the output terminals of the cold water buffer tank and the hot water buffer tank; the output terminal of the high-precision proportional valve is connected to the input terminal of the cooling pipe; the control box is connected to the high-precision proportional valve, the air-cooled cooling tower, and the chiller.

[0018] In a preferred embodiment, the control box includes a data acquisition module, a communication module, an early warning module, a control module, and a statistics module.

[0019] The acquisition module is used to acquire temperature data from large-volume concrete, cold water tank, air-cooled cooling tower and the output of high-precision proportional valve, as well as to acquire high-precision proportional valve opening and closing data.

[0020] The output terminal of the acquisition module is connected to the communication module, early warning module, control module, and statistics module;

[0021] The communication module is used to read system database parameters and transmit them to the early warning module, control module, and statistics module.

[0022] The early warning module is used to provide early warnings and prompts regarding excessive temperature thresholds and trends in large-volume concrete.

[0023] The control module is used for high-precision proportional valve opening and closing degree control, air-cooled tower fan frequency and start / stop control, and chiller temperature adjustment and start / stop;

[0024] The statistics module is used to collect data from the module's output reports, and to display and manage the data on the platform.

[0025] In a preferred embodiment, the air-cooled cooling tower is a counter-flow air-cooled tower.

[0026] In a preferred embodiment, the hot water pump and the cold water pump are ISG type vertical pipeline centrifugal pumps.

[0027] The beneficial technical effects of this utility model are:

[0028] Compared with the prior art, this application provides a large-volume concrete temperature cooling system, which effectively improves the overall structure and assembly method of the cooling pipe, air-cooled cooling tower, chiller, cold water tank, pump station and temperature control master station;

[0029] By using real-time statistical analysis from the temperature control master station to predict temperature trends in advance, the internal temperature of the concrete is kept at an ideal level. Multi-level physical cooling methods are employed: the cooling water reaches the system's highest temperature through the large-volume concrete cooling pipes, then flows through the return pipe to the distributor of the air-cooled cooling tower. As it flows downwards, it is cooled by a large volume of air and evaporative cooling from the fans at the bottom of the tower. The water then collects at the bottom of the tower and enters the chiller for refrigeration and storage in the chilled water tank. The chilled water pumps and hot water pumps in the pump station power the water cooling circulation, drawing hot water from the bottom of the air-cooled cooling tower and chilled water from the chilled water tank, simultaneously supplying it to the intelligent temperature control master station. The master station statistically analyzes the collected real-time temperature data of the large-volume concrete and, combined with the specifications in "GB50496-2018-Standard for Construction of Large-Volume Concrete," adjusts the high-precision proportional valve to obtain the optimal inlet water temperature. This ultimately controls the cooling rate of the large-volume concrete within the optimal range, ensuring high cooling efficiency, precise temperature control, and effectively reducing the overall energy consumption of the system.

[0030] In terms of water resource management, considering the rational use of water resources, especially in areas with scarce water resources, we adopt efficient and energy-saving cooling solutions and recycle cooling water, which can both meet cooling needs and save water.

[0031] In terms of environmental protection, temperature control is implemented while reducing the environmental discharge of high-temperature water. Low-carbon and energy-saving technologies are adopted to reduce the impact on the environment, achieve effective resource utilization and environmental protection, and meet the requirements of sustainable development. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A schematic diagram of a water circulation frame for a large-volume concrete temperature cooling system provided for an embodiment of this utility model;

[0034] Figure 2 A schematic diagram of the pump station structure provided for an embodiment of this utility model;

[0035] Figure 3 A schematic diagram of the temperature control master station structure provided in this embodiment of the utility model;

[0036] Figure 4 This is a schematic diagram of the modules inside the control box provided in an embodiment of the present utility model;

[0037] Figure 5 A schematic diagram of the system operation logic inside the control box provided for an embodiment of this utility model;

[0038] Explanation of reference numerals in the attached figures;

[0039] 1-Cooling pipe; 2-Air-cooled cooling tower; 3-Chiller; 4-Cold water tank; 5-Pump station; 51-Hot water pump; 52-Cold water pump; 53-Standby water pump; 54-Pipeline; 55-Gate valve; 6-Temperature control master station; 61-Cold water buffer tank; 62-Hot water buffer tank; 63-High-precision proportional valve; 64-Control box. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] Example 1

[0042] Please see Figures 1 to 3 A large-volume concrete temperature cooling system includes a cooling pipe 1, an air-cooled cooling tower 2, a chiller 3, a cold water tank 4, a pump station 5, and a temperature control main station 6.

[0043] Cooling pipe 1 is embedded in the large volume concrete for heat exchange of the large volume concrete; the output end of cooling pipe 1 is connected to the input end of air-cooled cooling tower 2, the input end of chiller 3 is connected to the output end of air-cooled cooling tower 2, and the input end of chilled water tank 4 is connected to the output end of chiller 3.

[0044] Pump station 5 includes a hot water pump 51 and a cold water pump 52;

[0045] The input end of the hot water pump 51 is connected to the bottom of the air-cooled cooling tower 2, and the input end of the cold water pump 52 is connected to the output end of the cold water tank 4.

[0046] The output terminals of hot water pump 51 and cold water pump 52 are connected to the input terminal of temperature control master station 6;

[0047] The output of the temperature control master station 6 is connected to the input of the cooling pipe 1. After passing through the large-volume concrete cooling pipe 1, the cooling water temperature reaches the highest temperature of the system. It is then introduced into the water distributor of the air-cooled cooling tower 2 through the return water pipe. While flowing down, it is cooled by a large volume of air and evaporative cooling through the fan at the bottom of the air-cooled cooling tower 2. After gathering at the bottom of the air-cooled cooling tower 2, it enters the chiller 3 for refrigeration and storage in the cold water tank 4. The cold water pump 51 and hot water pump 52 in the pump station 5 provide power for the water cooling circulation, drawing hot water from the bottom of the air-cooled cooling tower 2 and drawing cold water from the cold water tank 4, which is simultaneously delivered to the intelligent temperature control master station 6. The temperature control master station 6 performs statistical analysis on the real-time temperature data of the large-volume concrete and finally controls the cooling rate of the large-volume concrete within the optimal range to ensure high cooling efficiency, accurate temperature control, and effectively reduce the overall energy consumption of the system.

[0048] In this embodiment, the pump station 5 also includes a standby water pump 53 and a pipeline 54;

[0049] The standby water pump 53 is located between the hot water pump 51 and the cold water pump 52. The input end of the standby water pump 53 is connected to the input ends of the hot water pump 51 and the cold water pump 52 through the pipe 54, and the output end of the standby water pump 53 is connected to the output ends of the hot water pump 51 and the cold water pump 52 through the pipe 54. The two-in-use and one-in-standby configuration is adopted to increase the stability of the equipment.

[0050] In this embodiment, the pipeline 54 is provided with several gate valves 55. The gate valves 55 are respectively set at the input end of the standby water pump 53 and the input ends of the hot water pump 51 and the cold water pump 52, and are respectively set at the output end of the standby water pump 53 and the output ends of the hot water pump 51 and the cold water pump 52. In the large-volume concrete temperature cooling system, these gate valves 55 can be used to completely cut off the water flow in the pipeline 54 to facilitate the switching of the standby water pump 53.

[0051] In this embodiment, the temperature control master station 6 includes a cold water buffer tank 61, a hot water buffer tank 62, a high-precision proportional valve 63, and a control box 64.

[0052] The input end of the cold water buffer tank 61 is connected to the output end of the cold water pump 52, and the input end of the hot water buffer tank 62 is connected to the output end of the hot water pump 51.

[0053] The input terminals of the high-precision proportional valve 63 are respectively located at the output terminals of the cold water buffer tank 61 and the hot water buffer tank 62; the output terminal of the high-precision proportional valve 63 is connected to the input terminal of the cooling pipe 1; the control box 64 is connected to the high-precision proportional valve 63, the air-cooled cooling tower 2 and the chiller 3; the temperature control master station 6 obtains the optimal inlet water temperature by adjusting the high-precision proportional valve 63, and finally controls the cooling rate of the large volume concrete within the optimal range, thereby ensuring high cooling efficiency, accurate temperature control, and effectively reducing the overall energy consumption of the system;

[0054] Please see Figures 4 to 5 In this embodiment, the control box 64 includes a data acquisition module, a communication module, an early warning module, a control module, and a statistics module.

[0055] The data acquisition module is used to acquire temperature data from the output terminals of the large-volume concrete, cold water tank 4, air-cooled cooling tower 2, and high-precision proportional valve 63, as well as to acquire the opening and closing data of high-precision proportional valve 63.

[0056] The output of the data acquisition module is connected to the communication module, early warning module, control module, and statistics module.

[0057] The communication module is used to read system database parameters and transmit them to the early warning module, control module, and statistics module.

[0058] The early warning module is used to provide early warnings and alerts when the temperature threshold and trend of large-volume concrete exceed the acceptable range.

[0059] The control module is used for high-precision proportional valve 63 opening degree control, air-cooled tower fan frequency and start / stop control, and chiller temperature adjustment and start / stop.

[0060] The statistics module is used to collect data from the module's output reports, and to display and manage the data on the platform.

[0061] In this embodiment, the air-cooled cooling tower 2 adopts a counter-flow air cooling tower; hot water is evenly sprayed down from the water distribution system at the top of the cooling tower, while air enters the cooling tower from the air inlet at the bottom of the cooling tower and flows from bottom to top. The water and air flow in opposite directions. Inside the cooling tower, the water forms a water film in the packing layer and comes into full contact with the rising air. The air absorbs the heat from the water, thereby lowering the water temperature. This counter-flow heat exchange method results in high heat exchange efficiency because the temperature difference between water and air remains large throughout the contact process, which is conducive to heat transfer.

[0062] In this embodiment, the hot water pump 51 and the cold water pump 52 are ISG type vertical pipeline centrifugal pumps, which have the advantages of compact structure, small footprint and convenient installation.

[0063] In this embodiment, the control box 64 does not involve specific circuits and algorithms, and this part is conventional prior art and will not be described in detail.

[0064] Embodiment 2

[0065] Please refer to Figure 5 , after the large-volume concrete temperature cooling system is started, the acquisition module acquires the temperatures TA inside, TA on the surface, and TA around of all the temperature sensors arranged three-dimensionally in the large-volume concrete, and simultaneously monitors the inlet water temperature TB, outlet water temperature TC of the cooling water pipe in the large-volume concrete, the water temperature TD of the air-cooled tower, and the water temperature TE of the cold water tank; the system performs intelligent analysis and intelligent control on the temperature threshold and temperature trend according to the read index specification parameters, specifically as follows:

[0066] Calculate the current maximum internal temperature TA inside max of the large-volume concrete based on the acquired temperatures.

[0067] TA inside max = max(TA inside-1, TA inside-2,..., TA inside-n)

[0068] Calculate the temperature rise T rise of the large-volume concrete according to the following formula.

[0069] T rise = TA inside max - T in-mold

[0070] Where, T in-mold is the in-mold temperature of the concrete when the large-volume concrete is poured.

[0071] According to the index specification, give a warning prompt when TA inside max > 45°C, and give an alarm when TA inside max > 50°C. [[ID=3】]

[0072] Calculate the temperature difference T inside-surface between the inside and the surface of the large-volume concrete according to the following formula.

[0073] T inside-surface = TA inside max - TA on the surface

[0074] According to the index specification, give two warning prompts when T inside-surface > 20°C and T inside-surface > 23°C, and

[0075] give an alarm when T inside-surface > 25°C.

[0076] Calculate the 4-hour temperature drop rate of the large-volume concrete according to the following formula

[0077] ΔT4h = TA inside - TA inside-24

[0078] According to the recording frequency of every 10 minutes and based on the system statistical data, obtain the temperature TA inside-24 of the previous 4 hours of the current temperature TA inside.

[0079] Give a warning prompt when ΔT4h > 0.4°C, and give an alarm when ΔT4h > 1°C.

[0080] Calculate the daily temperature drop rate of mass concrete according to the following formula

[0081] ΔT24h = TA inside - TA inside - 144

[0082] Record the frequency every 10 minutes. According to the system statistical data, obtain the temperature TA inside - 144 of the previous day of the current temperature TA inside.

[0083] Alarm when ΔT24h > 2°C.

[0084] According to the index specification "control the difference between the inlet water temperature and the maximum concrete temperature, and the temperature difference should be 15°C - 25°C", find the inlet water range of mass concrete TBmax > TB set > TBmin

[0085] TBmin = TA inside max - 25

[0086] TBmax = TA inside max - 15

[0087] Alarm and prompt when TB set exceeds the range.

[0088] Intelligently adjust the water temperature according to the cooling trend according to the following formula

[0089]

[0090] Where ΔT1h is the 1-hour cooling trend

[0091] ΔT1h = TA inside - TA inside - 6

[0092] Record the frequency every 10 minutes. According to the system statistical data, obtain the temperature TA inside - 6 of the previous 1 hour of the current temperature TA inside.

[0093] K1 is a constant used to ensure the stability and response speed of the system. Take the value of 10 according to experience.

[0094] K2 is a constant, which is the standard cooling rate. Take the value of 0.083 according to the specification.

[0095] Set the inlet water temperature TB set of mass concrete so that the actual inlet water temperature of mass concrete TB = TB set

[0096] Use the following formula for PID calculation to obtain the opening degrees of cold water, hot water and air respectively:

[0097]

[0098] Where:

[0099] u(t) is the output percentage of the cooling water proportional valve.

[0100] Kp is the proportional gain, preset to 2.

[0101] Ki is the integral gain, which is preset to 0.2.

[0102] Kd is the derivative gain, which is preset to 0.1.

[0103] e(t) is the error signal, which is usually defined as the target value (set point) minus the actual measured value, that is, e(t) = SP - PV, e(t) = TB - TB set.

[0104] The output percentage of the hot water proportional valve = 1 - u(t)

[0105] When TB set < TD, the water temperature setting TE set of the chiller = TB set, and the chiller set temperature is reduced followingly to reduce energy consumption until the chiller is turned off when TE set = TD.

[0106] When TB set > TD, reduce the frequency of the air-cooled tower motor until it is turned off.

[0107] When TB set > TD still occurs after both the chiller and the air-cooled tower are turned off, adjust the frequency of the pump station water pump until it is turned off.

[0108] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0109] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations on the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A large-volume concrete temperature cooling system, characterized in that, It includes cooling pipes (1), air-cooled cooling tower (2), chiller (3), cold water tank (4), pump station (5) and temperature control master station (6); The cooling pipe (1) is embedded in the large volume concrete for heat exchange of the large volume concrete; the output end of the cooling pipe (1) is connected to the input end of the air-cooled cooling tower (2), the input end of the chiller (3) is connected to the output end of the air-cooled cooling tower (2), and the input end of the cold water tank (4) is connected to the output end of the chiller (3). The pump station (5) includes a hot water pump (51) and a cold water pump (52); The input end of the hot water pump (51) is connected to the bottom of the air-cooled cooling tower (2), and the input end of the cold water pump (52) is connected to the output end of the cold water tank (4). The output terminals of the hot water pump (51) and the cold water pump (52) are connected to the input terminal of the temperature control master station (6); The output end of the temperature control master station (6) is connected to the input end of the cooling pipe (1).

2. The large-volume concrete temperature cooling system according to claim 1, characterized in that, The pumping station (5) also includes a backup water pump (53) and pipelines (54); The standby water pump (53) is located between the hot water pump (51) and the cold water pump (52). The input end of the standby water pump (53) is connected to the input ends of the hot water pump (51) and the cold water pump (52) through the pipe (54). The output end of the standby water pump (53) is connected to the output ends of the hot water pump (51) and the cold water pump (52) through the pipe (54).

3. The large-volume concrete temperature cooling system according to claim 2, characterized in that, The pipeline (54) is provided with several gate valves (55). The gate valves (55) are respectively set at the input end of the standby water pump (53) and the input ends of the hot water pump (51) and the cold water pump (52), and are respectively set at the output end of the standby water pump (53) and the output ends of the hot water pump (51) and the cold water pump (52).

4. The large-volume concrete temperature cooling system according to claim 1, characterized in that, The temperature control master station (6) includes a cold water buffer tank (61), a hot water buffer tank (62), a high-precision proportional valve (63), and a control box (64); The input end of the cold water buffer tank (61) is connected to the output end of the cold water pump (52), and the input end of the hot water buffer tank (62) is connected to the output end of the hot water pump (51). The input end of the high-precision proportional valve (63) is respectively located at the output end of the cold water buffer tank (61) and the hot water buffer tank (62); the output end of the high-precision proportional valve (63) is connected to the input end of the cooling pipe (1); the control box (64) is connected to the high-precision proportional valve (63), the air-cooled cooling tower (2) and the chiller (3).

5. A large-volume concrete temperature cooling system according to claim 4, characterized in that, The control box (64) includes a data acquisition module, a communication module, an early warning module, a control module, and a statistics module; The acquisition module is used to acquire temperature data from the output terminals of the large-volume concrete, cold water tank (4), air-cooled cooling tower (2) and high-precision proportional valve (63), as well as to acquire the opening and closing data of the high-precision proportional valve (63). The output terminal of the acquisition module is connected to the communication module, early warning module, control module, and statistics module; The communication module is used to read system database parameters and transmit them to the early warning module, control module, and statistics module. The early warning module is used to provide early warnings and prompts regarding excessive temperature thresholds and trends in large-volume concrete. The control module is used for high-precision proportional valve (63) opening degree control, air-cooled tower fan frequency and start / stop control, and chiller temperature adjustment and start / stop; The statistics module is used to collect data from the module's output reports, and to display and manage the data on the platform.

6. The large-volume concrete temperature cooling system according to claim 1, characterized in that, The air-cooled cooling tower (2) is a counter-flow air-cooled tower.

7. The large-volume concrete temperature cooling system according to claim 1, characterized in that, The hot water pump (51) and cold water pump (52) are ISG type vertical pipeline centrifugal pumps.

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