A wind power tower concrete prefabricated product steam curing device and method

Abstract

This invention discloses a steam curing device and method for precast concrete products used in wind turbine towers, relating to the field of wind turbine tower curing technology. The device includes: a curing base for placing precast concrete products; a central steam supply unit disposed on the curing base; an external steam injection unit disposed on the outside of the precast concrete products; a sensor network unit including temperature and humidity sensors arranged in the central steam supply unit and the external steam injection unit, and a concrete strength maturity sensor embedded in the precast concrete products; and a controller connecting and controlling the operation of the central steam supply unit, the external steam injection unit, and the sensor network unit. This invention ensures uniform curing and significant energy savings through zoned on-demand heating and waste heat recovery. Real-time strength monitoring and intelligent prediction guarantee quality and greatly improve production efficiency. Adopting a modular and variable structural design, one set of equipment can flexibly adapt to various product specifications.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower maintenance technology, specifically to a steam curing device and method for precast concrete wind turbine towers. Background Technology

[0002] Wind power generation is a key pillar of the clean energy system. Large wind turbine towers are generally assembled on-site from ultra-large precast concrete segments. These segments often have diameters of four to six meters and lengths exceeding ten meters, making them large and precision components. In the manufacturing process of these tower segments, steam curing is a core technology that accelerates concrete strength development and significantly shortens the production cycle. The high-temperature and high-humidity environment effectively promotes cement hydration, enabling the components to achieve the mechanical properties required for hoisting or transportation in a shorter time. This is crucial for ensuring the construction progress of wind farms and controlling overall project costs. Therefore, the advancement and reliability of steam curing technology directly affect the production mode of wind turbine towers and the quality stability of the final product.

[0003] However, existing traditional steam curing technologies exhibit several insurmountable technical bottlenecks when treating such ultra-large concrete components. First, due to the enormous size of the components, uneven temperature and humidity fields easily form within the curing space. Using a single heat source for overall heating often results in heat concentration at the top while the bottom remains insufficiently warm, leading to significant temperature differences across the component. This affects the synchronicity of the concrete hydration reaction, ultimately compromising the overall uniformity and long-term durability of the structure. Second, to compensate for insufficient temperature in localized areas, traditional processes necessitate a long-duration, high-volume, blanket-style heating strategy. This inefficient heating method results in substantial energy waste and high energy costs. Summary of the Invention

[0004] The purpose of this invention is to provide a steam curing device and method for precast concrete products for wind turbine towers, which solves the problems existing in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides a steam curing device for precast concrete products of wind turbine towers, comprising: a curing base for placing precast concrete products;

[0006] A central steam supply unit is provided on the curing base. The central steam supply unit is a retractable structure and is used to pass through the central axis of the precast concrete product.

[0007] An external steam jetting unit is matched and disposed on the outside of the precast concrete product. The external steam jetting unit includes multiple combinable arc-shaped steam jetting modules, which cooperate to form a curing cover for enclosing the precast concrete product.

[0008] The sensor network unit includes temperature and humidity sensors arranged in the central steam supply unit and the external steam injection unit, and a concrete strength maturity sensor embedded in the precast concrete product.

[0009] The controller connects and controls the operation of the central steam supply unit, the external steam injection unit, and the sensor network unit. Based on the data from the sensor network unit, the controller independently controls the steam supply of the central steam supply unit and each of the arc-shaped steam injection modules.

[0010] Preferably, the central steam supply unit includes a multi-segment sleeve pipe and a servo motor for driving the central steam supply unit to extend and retract, and steam nozzles are arrayed on the pipe wall of the multi-segment sleeve pipe.

[0011] Preferably, the multiple arc-shaped steam injection modules are connected by a quick-locking mechanism, and a high-temperature resistant flexible sealing strip is provided at the joint.

[0012] Preferably, the central steam supply unit and each of the arc-shaped steam injection modules are connected to the main steam source through independent electronically controlled proportional valves, and the controller achieves independent control of the steam supply by controlling the opening degree of each electronically controlled proportional valve.

[0013] Preferably, it also includes a condensate heat recovery device disposed below the maintenance base. The condensate heat recovery device includes a water collection tank, a circulating pump and a heat exchanger, which is used to transfer the heat energy of the collected high-temperature condensate to the boiler's feedwater.

[0014] Preferably, the concrete strength maturity sensor is a wireless passive temperature and resistivity composite sensor.

[0015] A method for steam curing precast concrete products for wind turbine towers is also provided, including:

[0016] S1. The control center's steam supply unit extends and retracts to match the length of the precast concrete products, and splices the arc-shaped steam injection module to cover the precast concrete products.

[0017] S2. Steam is introduced into the control center steam supply unit and the external steam injection unit at a preset heating rate to heat the precast concrete products to the preset curing temperature.

[0018] S3. Real-time acquisition of temperature, humidity and concrete maturity data detected by the sensor network, and based on the built-in concrete strength development prediction model, independently adjust the steam supply of the central steam supply unit and each arc-shaped steam injection module to control the temperature difference of each part of the precast concrete product within the preset threshold.

[0019] S4. When the model determines that the concrete strength has reached the preset target value, stop the steam supply and perform cooling treatment at the preset cooling rate.

[0020] S5. Record the data of the entire curing process, including the steam supply, temperature and humidity and measured concrete strength at each time point, and optimize the concrete strength development prediction model based on the data.

[0021] Preferably, S3 also includes:

[0022] Control the operation of the condensate heat recovery device to collect the condensate generated during the maintenance process and preheat the boiler feedwater through a heat exchanger.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Through a steam supply system that combines internal and external components and provides precise zone control, the originally large curing space is physically divided into multiple independent control units. The control system provides "on-demand heating" based on the real-time heat demand of each area, ensuring that the temperature of all parts of the ultra-large component remains highly consistent throughout the curing process. This fundamentally guarantees the synchronicity of the concrete hydration reaction and the structural uniformity of the final product.

[0025] 2. It abandons the traditional fixed-time curing mode and introduces predictive intelligent control based on the concrete strength development model. By monitoring the strength development status inside the concrete in real time, it dynamically adjusts the curing process and can accurately predict when the target strength will be reached. Once the strength is reached, the curing ends immediately. While ensuring product quality, it minimizes the time spent on ineffective curing and achieves a revolutionary improvement in production efficiency.

[0026] 3. The length of the central steam supply section is adjustable, and the external steam injection section is assembled from standard modules. This allows the same set of equipment to be quickly adjusted and combined to flexibly adapt to the maintenance needs of a series of tower products with different diameters and lengths, greatly improving the utilization rate of the equipment and the flexible production capacity of the production line, and reducing the fixed asset investment of the production line.

[0027] 4. By collecting the high-temperature condensate generated during the maintenance process and using its heat energy to preheat the boiler feedwater, the waste heat is effectively recovered and recycled, directly reducing the fuel or electricity consumption of the steam generation source. In conjunction with precise zone temperature control technology, the energy utilization efficiency of the entire maintenance system is significantly improved, bringing considerable economic and environmental benefits. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the device;

[0030] Figure 2 This is a schematic diagram of the arc-shaped steam jet module;

[0031] Figure 3 This is a schematic diagram of the main steam source and its connection structure;

[0032] Figure 4 This is a schematic diagram of the condensate heat recovery device;

[0033] Figure 5 This is a structural diagram of the central steam supply unit;

[0034] Figure 6 This is a flowchart of the method steps in Example 2;

[0035] 100. Maintenance base; 200. Central steam supply unit; 210. Sleeve-type pipe; 220. Servo motor; 230. Steam nozzle; 300. External steam injection unit; 310. Arc-shaped steam injection module; 330. Quick locking mechanism; 410. Temperature and humidity sensor; 5. Controller; 600. Main steam source; 610. Electrically controlled proportional valve; 710. Water collection tank; 720. Circulation pump; 730. Heat exchanger. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] Please see Figure 1 The present invention provides a steam curing device for precast concrete products of wind turbine towers, comprising: a curing base 100 for placing precast concrete products;

[0039] A central steam supply unit 200 is installed on the curing base 100. The central steam supply unit 200 is a telescopic structure and is used to pass through the central axis of the precast concrete product.

[0040] An external steam jetting unit 300 is matched and disposed on the outside of the precast concrete product. The external steam jetting unit 300 includes multiple splicable arc-shaped steam jetting modules 310, which cooperate to form a curing cover for wrapping the precast concrete product.

[0041] The sensor network includes a temperature and humidity sensor 410 arranged in the central steam supply unit 200 and the external steam injection unit 300, and a concrete strength maturity sensor embedded in the precast concrete product.

[0042] The controller 5 connects the operation of the control center steam supply unit 200, the external steam injection unit 300 and the sensor network unit. Based on the data from the sensor network unit, the controller 5 independently controls the steam supply of the control center steam supply unit 200 and each arc-shaped steam injection module 310.

[0043] To address the technical problems of uneven temperature and humidity distribution, high energy consumption, and long curing cycles in the existing steam curing of precast concrete products for wind turbine towers, this embodiment provides a steam curing device for precast concrete products for wind turbine towers. This device offers an integrated technical solution, differing from existing technologies that use a single heat source for overall heating. The core of this solution lies in achieving on-demand heat distribution through structural zoning and intelligent control. The device includes a curing base 100 for supporting the precast concrete products; a retractable central steam supply unit 200 is installed inside the precast products; and an external steam injection unit 300, composed of multiple interlocking arc-shaped steam injection modules 310, covers the precast products. This combination of internal and external components... The heating structure physically divides the curing space into multiple independently controllable units. A sensor network distributed throughout the heating structure and precast components monitors the temperature, humidity, and concrete strength development in each area in real time. The controller 5, as the system's control core, receives and analyzes data from the sensor network, and based on the analysis results, independently and differentially adjusts the steam supply to the central steam supply unit 200 and each external arc-shaped steam jet module 310. In this way, precise control of the curing temperature field of the entire component is achieved, ensuring the uniformity of curing in all parts of the component, while avoiding ineffective overheating of other areas due to insufficient local temperature, thus achieving the technical effects of improving curing quality and reducing energy consumption.

[0044] Please see Figure 5 The central steam supply unit 200 includes a multi-segment sleeve pipe 210 and a servo motor 220 for driving the extension and retraction of the central steam supply unit 200. Steam nozzles 230 are arrayed on the pipe wall of the multi-segment sleeve pipe 210.

[0045] Specifically, the central steam supply unit 200 is structurally composed of a multi-segment sleeve-type metal pipe. To achieve its expandable function, the supply unit is equipped with a servo motor 220. The servo motor 220 drives the sleeve-type pipe 210 to expand or contract axially via a transmission mechanism. The technical purpose of this design is to enable the total length of the central steam supply unit 200 to precisely match the length of precast concrete products of different specifications, such as adjusting from 10 meters to 12 meters, to ensure full coverage of the entire inner cavity. The use of the servo motor 220 ensures the smoothness of the expansion and contraction process and the accuracy of positioning. To achieve uniform heating of the inner wall, multiple rows of steam nozzles 230 are arranged in an array along the circumference and axial direction on the pipe wall of the multi-segment sleeve-type pipe 210. The angle of these nozzles can be preset and adjusted to optimize the diffusion path of steam in the inner cavity and ensure that heat is evenly applied to the inner surface of the precast concrete product.

[0046] Please see Figure 2 Multiple arc-shaped steam injection modules 310 are connected by a quick-locking mechanism 330, and a high-temperature resistant flexible sealing strip is provided at the joint.

[0047] This embodiment further defines the external steam jet section 300. To achieve flexible adaptation and rapid assembly of tower preforms with different diameters, multiple arc-shaped steam jet modules 310 are spliced ​​together using a quick-locking mechanism 330. This mechanism can be in the form of manual or pneumatic buckles, pins, etc., allowing on-site workers to quickly assemble and disassemble the modules by hand or with simple tools. This design improves equipment turnover rate and production line flexibility. In order to form a sealed curing cover after the modules are spliced ​​to prevent internal steam and heat from leaking to the external environment, high-temperature resistant flexible sealing strips are embedded at the joints of each arc-shaped steam jet module 310. The material of the sealing strip can be silicone rubber or fluororubber, which can withstand the high temperature and high humidity environment during the curing process while ensuring the sealing effect, and compensate for the small displacement caused by thermal expansion and contraction of the module, thereby ensuring the overall airtightness and heat preservation of the curing cover, which is one of the technical guarantees for reducing energy consumption.

[0048] Please see Figure 3 The central steam supply unit 200 and each arc-shaped steam injection module 310 are connected to the main steam source 600 through an independent electronically controlled proportional valve 610. The controller 5 achieves independent control of the steam supply by controlling the opening degree of each electronically controlled proportional valve 610.

[0049] This embodiment provides a detailed description of the control method. To achieve independent and precise control of the steam supply to each zone, the central steam supply unit 200 and each independent arc-shaped steam injection module 310 are connected to the main steam pipeline through an independent electronically controlled proportional valve 610. The electronically controlled proportional valve 610 is an actuator that can receive electrical signals and proportionally adjust the valve opening. After making a decision, the controller 5 outputs a control signal, such as a 4-20mA current signal, to the electronically controlled proportional valve 610 corresponding to a specific heating area (the center or any external module). The electronically controlled proportional valve 610 linearly adjusts the valve core opening according to the signal strength, thereby precisely controlling the steam flow to that area. For example, when the controller 5 detects that the temperature in a certain area is too low, it increases the control signal of the corresponding valve, increasing its opening from 30% to 50% to supplement the heat. This one-to-one control relationship is the basis for realizing on-demand heat supplementation and zoned temperature control, ensuring that the control commands can be executed accurately and independently to each heating unit.

[0050] Please see Figure 4 It also includes a condensate heat recovery device installed below the maintenance base 100. The condensate heat recovery device includes a water collection tank 710, a circulating pump 720 and a heat exchanger 730, which is used to transfer the heat energy of the collected high-temperature condensate to the boiler feedwater.

[0051] To further improve the energy efficiency of the device, this embodiment adds a condensate heat recovery device. This device is physically located at the lowest point of the curing base 100 to collect all high-temperature condensate generated during the curing process using gravity. The device consists of three main components: a water collection tank 710 with a filter screen for collecting and filtering impurities from the condensate; a high-temperature resistant circulating pump 720 for providing circulation power for the collected condensate; and a plate or shell-and-tube heat exchanger 730. Its working process is as follows: the high-temperature condensate (temperature up to 80-95℃) generated during the curing process flows into the water collection tank 710. 10. The circulating pump 720 pumps this water into one side channel of the heat exchanger 730; at the same time, the ambient temperature feedwater (temperature about 15-25℃) supplied to the steam generator (boiler) is introduced into the other side channel of the heat exchanger 730; the two undergo non-contact heat exchange in the heat exchanger 730, and the heat energy of the high temperature condensate is transferred to the feedwater, so that its temperature is preheated to 60-75℃ before entering the boiler; this process recovers and reuses the heat energy of the condensate that was originally discharged as waste heat, directly reducing the fuel or electricity consumption required for the boiler to generate steam, and is an important part of achieving a reduction of more than 50% in the overall energy consumption of the system.

[0052] The concrete strength maturity sensor is a wireless passive temperature and resistivity composite sensor.

[0053] In this embodiment, the core sensor in the sensor network section is specifically defined. The concrete strength maturity sensor is a composite sensor, specifically a wireless passive temperature and resistivity composite sensor. The purpose of selecting this type of sensor is to solve the problem of measuring internal parameters of concrete. The wireless design allows the sensor to communicate with the external controller 5 without the need for physical cables after being embedded in the concrete, avoiding the risk of cable damage during construction and maintenance, and simplifying the deployment work. The communication protocol uses an industrial-grade wireless communication protocol with strong anti-interference capabilities, such as LoRaWAN, to adapt to the shielding effect of steam and steel reinforcement structures on the signal. Because of the passive design, the sensor does not require an internal battery when working, but obtains energy from an external reader through radio frequency energy harvesting technology. Therefore, it fundamentally solves the problem of traditional active sensors failing after the battery life is exhausted, enabling it to be used as a permanently embedded component and realizing the potential for monitoring the entire life cycle of the structure. The temperature and resistivity composite means that the sensor can simultaneously measure the two physical quantities of temperature and resistivity inside the concrete. These two parameters are key inputs for calculating the maturity of concrete and predicting its strength development, because the hydration process of concrete directly causes regular changes in its internal temperature and resistivity.

[0054] Example 2:

[0055] This invention also provides a method for steam curing of precast concrete products for wind turbine towers, comprising:

[0056] S1, The control center steam supply unit 200 extends and retracts to match the length of the precast concrete product, and splices the arc-shaped steam injection module 310 to cover the precast concrete product.

[0057] S2. The control center steam supply unit 200 and the external steam injection unit 300 introduce steam at a preset heating rate to heat the precast concrete products to the preset curing temperature.

[0058] S3. Real-time acquisition of temperature, humidity and concrete maturity data detected by the sensor network, and based on the built-in concrete strength development prediction model, independently adjust the steam supply of the central steam supply unit 200 and each arc-shaped steam injection module 310 to control the temperature difference of each part of the precast concrete product within the preset threshold.

[0059] S4. When the model determines that the concrete strength has reached the preset target value, stop the steam supply and perform cooling treatment at the preset cooling rate.

[0060] S5. Record the data of the entire curing process, including the steam supply, temperature and humidity and measured concrete strength at each time point, and optimize the concrete strength development prediction model based on the data.

[0061] This embodiment provides a specific steam curing method, the steps of which are as follows:

[0062] S1, Preparation stage: According to the size of the precast concrete product to be cured, such as 12 meters in length and 5 meters in diameter, the servo motor 220 is driven by the controller 5 to extend the central steam supply unit 200 to 12 meters; at the same time, the workers splice multiple arc-shaped steam injection modules 310 to form a curing cover that tightly wraps the outer wall of the precast product.

[0063] S2, Heating Stage: The system is started, and the controller 5 controls the opening of the electronically controlled proportional valves 610 of each zone according to the preset heating program. Steam is slowly introduced at a set heating rate (for example, to prevent excessive thermal stress, it is controlled within the range of 10-20℃ / hour, preferably 15℃ / hour in this embodiment) until the temperature of the component and the curing space uniformly reaches the preset curing target temperature (usually 60-70℃, preferably 65℃ in this embodiment). This process can prevent the component from cracking due to thermal stress.

[0064] S3, Constant Temperature and Intelligent Control Stage: Upon entering this stage, controller 5 collects all data from the sensor network at a high frequency (e.g., per second). The concrete strength development prediction model built into controller 5 calculates the equivalent age and current strength in real time based on the measured internal temperature and resistivity data of the concrete. Simultaneously, controller 5 monitors the temperature of each zone. If the temperature of a certain zone is found to be lower than the set value (e.g., 65℃) or the concrete strength development in that zone lags behind the target curve, the steam supply to the corresponding valve in that zone is increased; conversely, it is decreased. This closed-loop regulation process continues, precisely controlling the temperature difference between all measuring points of the entire component within a preset threshold (e.g., not exceeding 5℃).

[0065] S4, Cooling and End Phase: The predictive model continuously predicts the moment when the target strength (e.g., 100% of the design strength) will be reached based on the current strength development rate; once the model determines that the concrete strength has reached the preset target value (e.g., 85% of the design grade strength or a specific strength value that meets the hoisting requirements), the controller 5 immediately and automatically closes all steam valves, stops heating, and enters the program-controlled cooling phase; the cooling rate is also controlled to prevent a sudden drop in temperature;

[0066] S5, Data Recording and Optimization Phase: After maintenance is completed, the system automatically saves all data from the entire process, including temperature curves, steam supply curves, intensity development curves, total time, and total energy consumption for each zone. This data forms a case database. Machine learning algorithms can be used to model and optimize this historical data. For example, a multiple regression model can be constructed, where the input variables are process parameters such as the heating rate, constant temperature, and constant temperature duration for each zone, and the output variables are total energy consumption and final maintenance time. By analyzing the weight and correlation of each input parameter to the output result through this model, the optimal combination of process parameters that achieves the lowest energy consumption or shortest time while ensuring the intensity meets the standard can be calculated. The optimized process curve can be used as a preset procedure for the maintenance of subsequent products of the same model, enabling continuous iterative improvement of the process and finding the correlation between process parameters and result parameters to calculate the optimized maintenance process curve with lower energy consumption or shorter time. The optimized curve can be used as a preset procedure for the maintenance of subsequent products of the same model, enabling continuous iterative improvement of the process.

[0067] The concrete strength development prediction model is further explained; this model can adopt the theory based on equivalent age; specifically, the controller 5 first calculates the equivalent age using an equivalent age function (such as the Arrhenius function) based on the internal temperature T(t) measured in real time by the concrete strength maturity sensor. :

[0068]

[0069] Equivalent age;

[0070] It is the apparent activation energy of the cement hydration reaction;

[0071] It is the ideal gas constant;

[0072] For reference temperature;

[0073] The actual internal temperature of the concrete is measured in real time by sensors.

[0074] The time step or interval for performing temperature measurements and maturity calculations;

[0075] Simultaneously, the model also incorporates real-time measured resistivity ρ(t) and predicts the current concrete strength S(t) using a pre-calibrated strength-equivalent age-resistivity relationship curve (or function); for example, a simplified relationship can be:

[0076]

[0077] It is the final strength;

[0078] It was obtained by fitting experimental data;

[0079] This model enables the system to transform intensity, which is difficult to measure directly, into parameters that can be calculated in real time using temperature and resistivity.

[0080] Example 8:

[0081] S3 also includes:

[0082] Control the operation of the condensate heat recovery device to collect the condensate generated during the maintenance process and preheat the boiler feedwater through the heat exchanger 730;

[0083] This embodiment supplements the method; specifically, while performing step S3, i.e., the intelligent constant temperature curing stage, the method also includes starting and running the condensate heat energy recovery device; in this stage, due to the continuous steam supply, high-temperature condensate will be continuously generated and collected in the water collection tank 710 at the bottom of the curing base 100; the circulation pump 720 of the heat energy recovery device is started, pumping this high-temperature condensate from the water collection tank 710 to the heat exchanger 730; in the heat exchanger 730, this heat is transferred to the ambient temperature feedwater before entering the boiler, preheating it; this heat energy recovery process and the intelligent constant temperature curing process are carried out in parallel and continuously, converting the waste heat generated during the curing process into effective energy in real time, directly reducing the energy input of the steam generation source, and working in synergy with the intelligent zone temperature control technology in S3 to jointly achieve high efficiency and energy saving in the curing process.

[0084] Compared with existing technologies, the complete set of steam curing devices and methods for precast concrete wind turbine towers provided in this technical solution demonstrates significant technological progress and beneficial effects.

[0085] Firstly, while improving the uniformity of curing, it significantly reduces energy consumption. Existing technologies generally use a single heat source to heat the entire large curing space, which inevitably leads to severely uneven heat distribution and excessive temperature differences between different parts of the components, thus affecting the final structural quality. To compensate for this defect, it is necessary to carry out ineffective heating with long-term and large-volume steam, resulting in serious energy waste. The technical concept of this solution is completely different. It physically divides the large curing space into multiple independently controllable heating units through a central steam supply unit 200 located inside and an external steam injection unit 300 covering the outside. The controller 5 uses the temperature data of each zone collected in real time by the sensor network unit to control the temperature of each zone through independent electrical... The proportional control valve 610 independently controls the steam supply to the central steam supply unit 200 and each arc-shaped steam injection module 310. This control logic realizes the transformation from overall heating to zoned on-demand heating, which can precisely control the temperature difference of each part of the entire super-large component within a preset threshold, fundamentally ensuring the synchronicity and uniformity of the concrete hydration reaction. At the same time, the solution is also equipped with a condensate heat recovery device, which transfers the heat energy contained in the high-temperature condensate generated during the curing process to the boiler feedwater through the heat exchanger 730, realizing the recycling of waste heat. The synergistic effect of precise zoned control and direct heat recovery makes the overall energy consumption more than 50% lower than that of traditional processes.

[0086] Secondly, while ensuring curing quality, a revolutionary improvement in curing efficiency has been achieved. Traditional curing processes rely heavily on fixed time schedules, with curing cycles lasting 24 to 72 hours, making it impossible to dynamically adjust according to the actual strength development of the concrete, resulting in low production efficiency. The core advancement of this solution lies in the introduction of closed-loop control logic based on a concrete strength development prediction model. Through concrete strength maturity sensors embedded in precast concrete products, the system no longer relies on fixed time schedules but monitors and predicts the actual strength development state inside the concrete in real time. When the model determines that the concrete strength has reached the preset target value, the system immediately stops steam supply and proceeds... The system initiates a cooling process; this mechanism completely eliminates the large amount of redundant curing time set based on conservative estimates in traditional processes, shortening the curing cycle from a fixed tens of hours to the shortest necessary time dynamically determined according to actual conditions; in addition, throughout the entire process of heating, maintaining constant temperature, and cooling, the system ensures that the rate of temperature change is on the optimal path most beneficial to concrete quality, avoiding thermal damage caused by excessively rapid heating, thus minimizing curing time while ensuring the final product quality; after curing, the system also records the entire process data and optimizes the concrete strength development prediction model based on the data, giving it the ability to continuously self-optimize;

[0087] Thirdly, through a unique structural design, the equipment achieves high flexibility and standardization. Traditional curing kilns are usually of fixed size, and one type of kiln can only match one or a few types of products, resulting in poor production line flexibility. This solution has made systematic improvements in this regard. The central steam supply unit 200 is designed with a telescopic structure, and its multi-segment sleeve-type pipe 210 can accurately match concrete precast products of different lengths under the drive of the servo motor 220. The external steam injection unit 300 is composed of multiple combinable arc-shaped steam injection modules 310, which are connected by a quick-locking mechanism 330. This modular design allows it to be quickly assembled like building blocks to adapt to tower segments of different diameters. One set of equipment can meet the curing needs of a series of products of different specifications through simple mechanical adjustments and splicing, without the need to customize special curing devices for each specification, which greatly improves the utilization rate of the equipment, reduces fixed asset investment, and enhances the flexible production capacity of the production line.

[0088] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for steam curing precast concrete products for wind turbine towers, characterized in that, include: Curing base (100) is used to place precast concrete products; A central steam supply unit (200) is provided on the curing base (100). The central steam supply unit (200) is a telescopic structure and is used to pass through the central axis of the precast concrete product. An external steam jetting section (300) is matched and disposed on the outside of the precast concrete product. The external steam jetting section (300) includes a plurality of combinable arc-shaped steam jetting modules (310), which cooperate to form a curing cover for covering the precast concrete product. The sensor network unit includes a temperature and humidity sensor (410) arranged in the central steam supply unit (200) and the external steam injection unit (300), and a concrete strength maturity sensor embedded in the precast concrete product. The controller (5) connects and controls the operation of the central steam supply unit (200), the external steam injection unit (300) and the sensor network unit. Based on the data from the sensor network unit, the controller (5) independently controls the steam supply of the central steam supply unit (200) and each of the arc-shaped steam injection modules (310). The curing methods applied to steam curing devices for precast concrete products used in wind turbine towers include: S1, The control center steam supply unit (200) extends and retracts to match the length of the precast concrete product, and splices the arc-shaped steam injection module (310) to cover the precast concrete product; S2, the control center steam supply unit (200) and the external steam injection unit (300) introduce steam at a preset heating rate to heat the precast concrete products to the preset curing temperature; S3. Real-time acquisition of temperature, humidity and concrete maturity data detected by the sensor network, and based on the built-in concrete strength development prediction model, independently adjust the steam supply of the central steam supply unit (200) and each arc-shaped steam injection module (310) to control the temperature difference of each part of the precast concrete within the preset threshold. S4. When the model determines that the concrete strength has reached the preset target value, stop the steam supply and perform cooling treatment at the preset cooling rate. S5. Record the data of the entire curing process, including the steam supply, temperature and humidity and measured concrete strength at each time point, and optimize the concrete strength development prediction model based on the data. S3 also includes: Control the operation of the condensate heat recovery device to collect the condensate generated during the maintenance process and preheat the boiler feedwater through the heat exchanger (730).

2. The steam curing method for precast concrete wind turbine towers according to claim 1, characterized in that, The central steam supply unit (200) includes a multi-segment sleeve pipe (210) and a servo motor (220) for driving the central steam supply unit (200) to extend and retract. Steam nozzles (230) are arranged in an array on the pipe wall of the multi-segment sleeve pipe (210).

3. The steam curing method for precast concrete wind turbine towers according to claim 1, characterized in that, Multiple arc-shaped steam jet modules (310) are connected by a quick-locking mechanism (330) and a high-temperature resistant flexible sealing strip is provided at the joint.

4. The steam curing method for precast concrete wind turbine towers according to claim 1, characterized in that, The central steam supply unit (200) and each of the arc-shaped steam injection modules (310) are connected to the main steam source (600) through independent electronically controlled proportional valves (610). The controller (5) achieves independent control of the steam supply by controlling the opening degree of each electronically controlled proportional valve (610).

5. A method for steam curing precast concrete products for wind turbine towers according to claim 1, characterized in that, It also includes a condensate heat recovery device located below the maintenance base (100), the condensate heat recovery device including a water collection tank (710), a circulation pump (720) and a heat exchanger (730) for transferring the heat energy of the collected high-temperature condensate to the boiler feedwater.

6. The steam curing method for precast concrete wind turbine towers according to claim 1, characterized in that, The concrete strength maturity sensor is a wireless passive temperature and resistivity composite sensor.

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