Aggregate bin intelligent air cooling system based on temperature field feedback and control method

Abstract

The application discloses an aggregate bin intelligent air cooling system and a control method based on temperature field feedback, and belongs to the technical field of building material preparation and storage. The technical problem to be solved is that the air flow distribution is blind, the cooling is uneven, and the energy consumption is high in the existing aggregate air cooling technology. The technical solution points are that a temperature field sensing unit is arranged to collect the temperature distribution on the surface of the material pile and identify the high-temperature area, the air chamber at the bottom of the bin is divided into multiple independent air zones, and each air zone is provided with a controllable air door; a control unit establishes a spatial mapping relationship between the high-temperature area and the air zone, and differentiates and independently adjusts the opening degree of each controllable air door according to the spatial mapping relationship to realize targeted air supply; and the corresponding control method is matched to complete temperature calibration, opening degree calculation and cyclic regulation, so that the accurate regulation and control of the aggregate air cooling are realized.

Description

Technical Field

[0001] This invention belongs to the field of building material preparation and storage technology, specifically relating to an intelligent air-cooling system and control method for aggregate bins based on temperature field feedback. Background Technology

[0002] In the construction of large-volume concrete projects, the pre-cooling of sand and gravel aggregates is a core step in controlling the temperature of the concrete at the discharge port and preventing temperature cracks. Traditional aggregate pre-cooling mainly relies on introducing cold air into the bottom of the silo, but this method has obvious drawbacks: the airflow distribution within the pile is uneven, easily forming airflow "short circuits," resulting in poor cooling effect inside the pile and high overall system energy consumption; at the same time, due to differences in particle size and bulk density, aggregates themselves will form "hot spots" with uneven temperature, which traditional air-cooling methods cannot accurately identify and address.

[0003] Existing air-cooled silo designs generally lack the ability to accurately perceive the internal temperature field of the material pile, and have not achieved dynamic airflow distribution control based on temperature field distribution. They mostly adopt an open-loop control mode of "timed and fixed air volume", which cannot dynamically adjust the air supply strategy according to the real-time temperature changes of the aggregate. There are always problems of "over-cooling" or "under-cooling", which cannot balance cooling uniformity and energy economy. They are difficult to meet the high standards of aggregate temperature stability required by modern concrete production, thus restricting the improvement of concrete quality and the optimization of production energy consumption.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems in the prior art, the present invention provides an intelligent air-cooling system and control method for aggregate bins based on temperature field feedback, which solves the problems of blind airflow distribution, uneven cooling and high energy consumption in the existing aggregate air-cooling technology.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] In the first aspect, an intelligent air-cooled system for aggregate bins based on temperature field feedback includes: an aggregate bin body, an infrared thermal imager, an air chamber, a partition plate, multiple sets of controllable air dampers, a refrigeration unit, and a control unit. The infrared thermal imager is installed on the top of the aggregate bin body. The detection field of the infrared thermal imager covers the entire upper surface of the aggregate pile inside the aggregate bin body and is used to collect temperature distribution images of the upper surface of the aggregate pile. The air chamber is located at the bottom of the aggregate bin body. The partition plate is fixed inside the air chamber, dividing the air chamber into multiple independent air zones. Each set of controllable air dampers is installed at the air inlet of one of the air zones. The air outlet of the refrigeration unit is connected to the air inlet of each of the air zones. The control unit is connected to the infrared thermal imager and each of the controllable dampers respectively. The control unit is configured to: receive the temperature distribution image, identify high-temperature areas in the temperature distribution image whose temperature is higher than a preset threshold, establish a spatial mapping relationship between the high-temperature areas and each of the air zones, and independently adjust the opening of each of the controllable dampers according to the spatial mapping relationship, so that the opening of the controllable damper of the air zone corresponding to the high-temperature area is greater than the opening of the controllable damper of the air zone not corresponding to the high-temperature area.

[0008] Furthermore, it also includes at least one temperature sensor, which is a contact temperature sensor. The temperature sensor is buried inside the material pile or installed at the discharge port of the aggregate bin body. The temperature sensor (4) is signal-connected to the control unit.

[0009] Furthermore, the scanning cycle of the infrared thermal imager is 3-10 minutes, and the control unit is configured to simultaneously acquire the temperature distribution image of the infrared thermal imager and the temperature data of the temperature sensor to complete the temperature data fusion calibration.

[0010] Furthermore, the partition plate is arranged radially and / or circumferentially to divide the air chamber into 4 to 9 air zones, and the projection of each air zone covers the entire storage cross-section of the aggregate bin body.

[0011] Furthermore, the controllable damper is an electrically proportional adjustable damper, and the opening adjustment range of the controllable damper is 0-100%, with an opening adjustment accuracy of not less than 1%.

[0012] Furthermore, the refrigeration unit includes a variable frequency fan and a refrigeration unit. The cold end of the refrigeration unit is connected to the air inlet side of the variable frequency fan, and the air outlet side of the variable frequency fan is connected to the air inlet of each air zone through an air supply duct.

[0013] Furthermore, the control unit is signal-connected to the variable frequency fan and the refrigeration unit, and the control unit is configured to adjust the speed of the variable frequency fan and the output power of the refrigeration unit according to the total opening of each controllable damper.

[0014] Furthermore, the control unit has a built-in airflow optimization algorithm module, which is configured such that the opening adjustment of the controllable damper is positively correlated with the difference between the average temperature of the area mapped by the controllable damper and the overall average temperature of the material pile.

[0015] Furthermore, the control unit is configured to divide the upper surface of the material pile into multiple grid cells, and each grid cell establishes a spatial mapping relationship with at least one of the wind zones.

[0016] Furthermore, the control unit is equipped with an industrial communication interface that supports the Modbus communication protocol, and the control unit communicates bidirectionally with the central control system for concrete production through the industrial communication interface.

[0017] Secondly, a control method for an intelligent air-cooled aggregate bin based on temperature field feedback, applied to the aforementioned intelligent air-cooled aggregate bin based on temperature field feedback, includes: S1. Obtain the temperature distribution image of the surface of the aggregate pile inside the aggregate bin; S2. Analyze the temperature distribution image to identify the high-temperature areas on the surface of the material pile; S3. Establish a spatial mapping relationship between the high-temperature area and multiple independent air zones at the bottom of the aggregate bin body; S4. Based on the spatial mapping relationship, determine the first damper opening value for the wind zone corresponding to the high temperature zone, and determine the second damper opening value for the remaining wind zones that do not correspond to the high temperature zone. The first damper opening value is greater than the second damper opening value. S5. Based on the determined opening values ​​of each damper, control the opening of the controllable dampers at the air inlet of each air zone.

[0018] Further, in step S1, the temperature distribution image is acquired by an infrared thermal imager installed on the top of the aggregate bin body, and temperature data from temperature sensors buried inside the material pile or installed at the discharge port of the aggregate bin body are collected simultaneously, and the temperature data of the temperature distribution image are fused and calibrated.

[0019] Further, in step S3, the surface of the material pile is divided into multiple grid units, and a spatial mapping relationship is established between each grid unit and at least one wind zone. The wind zone corresponding to the high-temperature zone is determined through the grid units.

[0020] Furthermore, it also includes a closed-loop feedback step, specifically including: After waiting for a preset scanning cycle, repeat steps S1 to S5 until the overall temperature of the material pile reaches the preset target cooling temperature and the temperature distribution is uniform.

[0021] The beneficial effects of this invention are as follows: (1) It has achieved full-domain accurate perception of the temperature field of the material pile. By scanning the entire area with an infrared thermal imager and calibrating with a contact temperature sensor, it has solved the core problems of existing technologies being unable to identify hot spots in the material pile and insufficient temperature perception accuracy, and provided a precise data basis for targeted air delivery. (2) The air chamber is divided into multiple independent and controllable air zones by partition plates. Combined with the independent and controllable air doors of each air zone, the traditional "flooding" air cooling is transformed into targeted and precise air delivery for hot spots. This fundamentally solves the defects of blind airflow distribution and uneven cooling in the existing technology and greatly improves the uniformity of aggregate cooling. (3) The air volume of each air zone is dynamically optimized according to the real-time temperature field of the material pile, avoiding the problem of excessive cooling caused by traditional open-loop control. It can effectively reduce the overall energy consumption of the system by 20%-40%, taking into account both cooling effect and energy economy. (4) A standard industrial communication interface is reserved, which can be seamlessly integrated into the concrete production control system, adapting to the full-process control requirements of industrialized concrete production, and is suitable for efficient pre-cooling of sand and gravel aggregates in various concrete mixing plants. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the intelligent air-cooled system for aggregate bins provided in an embodiment of the present invention; Figure 2 Top view and sectional view of the air chamber structure provided in the embodiments of the present invention; Figure 3 This is a schematic diagram illustrating the principle of temperature field and wind zone mapping provided in an embodiment of the present invention; Figure 4 A flowchart illustrating the control method for an intelligent air-cooled system for aggregate bins provided in an embodiment of the present invention; Figure label: 1. Aggregate bin body; 2. Infrared thermal imager; 3. Material pile; 4. Temperature sensor; 5. Air chamber; 6. Divider plate; 7. Air zone; 8. Controllable air damper; 9. Refrigeration unit; 10. Control unit. Detailed Implementation

[0023] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0024] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of the invention.

[0025] The following description of exemplary embodiments is merely illustrative and is not intended to limit the invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0026] Example 1 See Figure 1 , Figure 1 The present invention provides a structural diagram of an intelligent air-cooled aggregate bin based on temperature field feedback, comprising: an aggregate bin body 1, a temperature field sensing unit, a dynamic airflow distribution unit, and a control unit 10. M1, Aggregate bin body 1: Used to store sand and gravel aggregates, it adopts a closed or semi-closed structure, with an infrared thermal imager installation interface reserved at the top and a support structure adapted to the air chamber at the bottom to ensure that the airflow can penetrate evenly upwards into the interior of the material pile 3. M2, Temperature field sensing unit: including at least one infrared thermal imager 2, the infrared thermal imager 2 is set on the top of the aggregate bin body 1, its detection field covers the entire upper surface of the material pile 3 inside the aggregate bin body 1, and is used to collect temperature distribution images of the surface of the material pile 3 in real time and output temperature field data. The temperature field sensing unit also includes at least one contact temperature sensor 4, which is set at the discharge port of the aggregate bin body 1 or at a key depth position of the material pile 3. It is used to calibrate the detection data of the infrared thermal imager 2, supplement the internal temperature information of the material pile 3, and improve the accuracy of temperature field sensing. M3, Dynamic Airflow Distribution Unit: The dynamic airflow distribution unit is the structural foundation for the system to achieve targeted air delivery, including air chamber 5, partition plate 6, multiple sets of controllable dampers 8, and cooling unit 9; the internal structure of the air chamber and the air zone division method are as follows: Figure 2 As shown; The air chamber 5 is located at the bottom of the aggregate bin body 1. The air chamber 5 is divided into multiple independent air zones 7 by the partition plate 6. The number of air zones 7 is preferably 4 to 9, which can be flexibly adjusted according to the size of the aggregate bin. The shape of the air zone 7 is adapted to the cross-section of the aggregate bin body 1 and is distributed in a fan shape or rectangle. Each air zone 7 independently realizes air intake control. Each air inlet of air zone 7 is equipped with a controllable damper 8. The controllable damper 8 is an electrically adjustable damper with an opening range of 0-100% and an adjustment accuracy of not less than 1%. It can control the air volume of the corresponding air zone 7 independently. The refrigeration unit 9 uses a variable frequency fan in conjunction with a water chiller or a direct air cooler, and is connected to the air chamber 5 to provide cool air with adjustable temperature and air volume. M4 and control unit 10 are respectively connected to the infrared thermal imager 2, each controllable air damper 8, and the refrigeration unit 9; the mapping principle between the temperature field of the material pile and the bottom air zone is as follows: Figure 3 As shown; Figure 3 The left half is a thermal image of the surface of material pile 3, using color gradients to represent the temperature range; the right half is a bottom wind zone division diagram, which corresponds one-to-one with the material pile area in the left half of the image. The larger the arrow, the greater the air volume of the corresponding wind zone. The number 7 corresponds to the wind zone. The control unit 10 includes an image processing module, an airflow optimization algorithm module, a control execution module, and a data interface. The functions of each module are as follows: The image processing module is connected to the infrared thermal imager 2 to receive temperature distribution images, perform noise reduction and enhancement processing on the images, identify and quantify the temperature distribution on the surface of the material pile 3, and accurately locate the high-temperature hot spot area and low-temperature cold spot area of ​​the material pile 3. The airflow optimization algorithm module adopts a proportional control algorithm, a weighted allocation algorithm, or a PID feedback control algorithm. Its core logic is: the increase in damper opening is proportional to the difference between the average temperature of the corresponding mapped area and the average temperature of the overall pile. It is used to calculate the optimal opening of the controllable damper 8 corresponding to each wind zone 7 based on the mapping relationship between the temperature distribution image and the pile area-wind zone. The control execution module is signal-connected to each controllable damper 8 and refrigeration unit 9, and is used to send the calculated damper opening command and fan operating parameter command to the corresponding actuator to complete the action execution. The data interface uses the Modbus protocol to communicate with the central control system for concrete production, and is used to receive target temperature commands and upload real-time operating data to achieve integrated system management.

[0027] The working principle of this embodiment is as follows: The infrared thermal imager 2 acquires the temperature distribution image on the surface of the material pile 3, and the contact temperature sensor 4 completes the temperature data fusion calibration to achieve accurate perception of the temperature field of the entire material pile. The control unit 10 identifies the high-temperature hot spot area of ​​the material pile 3 through the image processing module and establishes a spatial mapping relationship between the high-temperature area and each air zone 7 at the bottom. Then, through the airflow optimization algorithm module, it calculates a larger damper opening for the air zone 7 corresponding to the high-temperature hot spot area and a smaller damper opening for the air zone 7 corresponding to the low-temperature cold spot area, realizing intelligent decision-making for differentiated targeted air supply. Subsequently, through the control execution module, it controls each controllable damper 8 to perform corresponding opening adjustment, and synchronously adjusts the operating status of the refrigeration unit 9 to match the cold air supply demand of the current working condition. After waiting for the preset scanning cycle, the temperature field data of the material pile is acquired again, the cooling effect of the previous cycle is evaluated, and the above control process is repeated to form a complete closed-loop control until the overall temperature of the material pile 3 reaches the target cooling temperature and the temperature distribution is uniform. This transforms the traditional "flooding" type of air cooling into targeted and precise air delivery, achieving uniform and efficient cooling of the aggregate and reducing the overall energy consumption of the system.

[0028] Example 2 See Figure 4 , Figure 4 This is a flowchart of an intelligent air-cooled aggregate bin system based on temperature field feedback proposed in this invention. The specific steps include: S1. System initialization: Obtain the temperature distribution image of the surface of the aggregate pile inside the aggregate bin; In practice: the target cooling temperature of the aggregate is set through the control unit. Preset temperature deviation The thermal imaging scanning cycle and the basic opening of the damper are used to complete the system parameter calibration; the thermal imaging scanning cycle is preferably 5 minutes, ranging from 3 to 10 minutes, and the preset temperature deviation ΔT range is 0.5-2℃.

[0029] S2. Temperature field sensing: Analyze the temperature distribution image to identify high-temperature areas on the surface of the material pile; In practice: the infrared thermal imager scans the surface of the material pile according to a preset cycle to generate a temperature field distribution map; the contact temperature sensor synchronously collects the internal temperature data of the material pile and uploads it to the control unit to complete the temperature data fusion calibration.

[0030] S3. Temperature Analysis and Zone Mapping: Establishing a spatial mapping relationship between the high-temperature zone and multiple independent air zones at the bottom of the aggregate silo body; specifically including: S31, The image processing module of the control unit analyzes the temperature field map and identifies temperatures higher than ( Areas with temperatures below ( ) are identified as hotspots (high-temperature areas), while areas with temperatures below ( ) are identified as hotspots (high-temperature areas). The area marked as ) is identified as a cold spot (low temperature area), and the remaining areas are normal temperature areas; S32. Divide the surface area of ​​the material pile into a grid on a two-dimensional plane, establish the spatial mapping relationship between the grid unit and each air zone at the bottom, and clarify one or more air zones corresponding to each grid unit to achieve a precise correspondence between the material pile area and the air zone.

[0031] S4. Air volume optimization calculation: Based on the spatial mapping relationship, determine the first damper opening value for the wind zone corresponding to the high temperature zone, and determine the second damper opening value for the remaining wind zones that do not correspond to the high temperature zone. The first damper opening value is greater than the second damper opening value. In specific implementation: The average temperature data of each grid cell, the mapping relationship between grid cells and wind zones, the current opening degree of each damper, fan operating parameters, and target temperature are used as input parameters. An optimization algorithm is employed for calculation. The optimization algorithm can be a weighted allocation algorithm, a PID-based feedback control algorithm, or a proportional control rule. An example calculation logic is as follows:

[0032] in, The proportional coefficient can be determined by debugging according to the actual working conditions; the final output is a set of controllable damper opening control commands adapted to each air zone, and the corresponding fan speed adjustment commands.

[0033] S5. Damper and fan operation adjustment: Based on the determined opening value of each damper, controllable dampers at the air inlet of each air zone are controlled to adjust their opening. In practice: the control unit's control execution module sends the opening command to the actuators of each controllable damper, adjusting the damper to the calculated opening; and synchronously adjusts the operating status of the refrigeration unit to ensure that the cold air supply matches the air volume demand.

[0034] S6. Control cycle waiting: After waiting for a preset scanning cycle, repeat steps S1 to S5 until the overall temperature of the material pile reaches the preset target cooling temperature and the temperature distribution is uniform, and enter the constant temperature maintenance mode.

[0035] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An intelligent air-cooled system for aggregate bins based on temperature field feedback, characterized in that, include: The aggregate bin body (1), infrared thermal imager (2), air chamber (5), partition plate (6), multiple sets of controllable air doors (8), refrigeration unit (9) and control unit (10); The infrared thermal imager (2) is installed on the top of the aggregate bin body (1). The detection field of the infrared thermal imager (2) covers the entire upper surface of the material pile (3) inside the aggregate bin body (1) and is used to collect temperature distribution images of the upper surface of the material pile (3). The air chamber (5) is located at the bottom of the aggregate bin body (1), and the partition plate (6) is fixed inside the air chamber (5) to divide the air chamber (5) into multiple independent air zones (7). Each set of controllable air doors (8) is installed at the air inlet of one of the air zones (7), and the air outlet of the refrigeration unit (9) is connected to the air inlet of each air zone (7). The control unit (10) is connected to the infrared thermal imager (2) and each controllable air door (8) respectively. The control unit (10) is configured to: receive the temperature distribution image, identify the high temperature area in the temperature distribution image whose temperature is higher than a preset threshold, establish the spatial mapping relationship between the high temperature area and each air zone (7), and independently adjust the opening degree of each controllable air door (8) according to the spatial mapping relationship, so that the opening degree of the controllable air door (8) of the air zone (7) corresponding to the high temperature area is greater than the opening degree of the controllable air door (8) of the air zone (7) not corresponding to the high temperature area.

2. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 1, characterized in that, It also includes at least one temperature sensor (4), which is a contact temperature sensor. The temperature sensor (4) is buried inside the material pile (3) or installed at the discharge port of the aggregate bin body (1). The temperature sensor (4) is signal connected to the control unit (10).

3. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 2, characterized in that, The scanning cycle of the infrared thermal imager (2) is 3-10 minutes. The control unit (10) is configured to synchronously acquire the temperature distribution image of the infrared thermal imager (2) and the temperature data of the temperature sensor (4) to complete the temperature data fusion calibration.

4. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 1, characterized in that, The partition plate (6) is arranged radially and / or circumferentially to divide the air chamber (5) into 4 to 9 air zones (7), the projection of each air zone (7) covering the entire storage cross section of the aggregate bin body (1).

5. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 1, characterized in that, The controllable damper (8) is an electric proportional adjustment damper, and the opening adjustment range of the controllable damper (8) is 0-100%, and the opening adjustment accuracy is not less than 1%.

6. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 1, characterized in that, The refrigeration unit (9) includes a variable frequency fan and a refrigeration unit. The cold end of the refrigeration unit is connected to the air inlet side of the variable frequency fan, and the air outlet side of the variable frequency fan is connected to the air inlet of each air zone (7) through an air supply duct.

7. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 6, characterized in that, The control unit (10) is connected to the variable frequency fan and the refrigeration unit by signal. The control unit (10) is configured to adjust the speed of the variable frequency fan and the output power of the refrigeration unit according to the total opening degree of each controllable damper (8).

8. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 1, characterized in that, The control unit (10) has a built-in airflow optimization algorithm module, which is configured such that the opening adjustment amount of the controllable damper (8) is positively correlated with the difference between the average temperature of the area mapped by the wind zone (7) corresponding to the controllable damper (8) and the overall average temperature of the material pile (3).

9. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 1, characterized in that, The control unit (10) is configured to divide the upper surface of the stockpile (3) into multiple grid cells, each grid cell having a spatial mapping relationship with at least one of the wind zones (7).

10. The intelligent air-cooled aggregate bin system based on temperature field feedback according to claim 1, characterized in that, The control unit (10) is equipped with an industrial communication interface that supports the Modbus communication protocol. The control unit (10) communicates bidirectionally with the central control system for concrete production through the industrial communication interface.

11. A control method for an intelligent air-cooled system for aggregate bins based on temperature field feedback, characterized in that, The intelligent air-cooled aggregate bin system based on temperature field feedback, applied to any one of claims 1-10, comprises: S1. Obtain the temperature distribution image of the surface of the aggregate pile (3) inside the aggregate bin body (1); S2. Analyze the temperature distribution image to identify the high-temperature region on the surface of the material pile (3); S3. Establish a spatial mapping relationship between the high-temperature area and multiple independent air zones (7) at the bottom of the aggregate bin body (1); S4. Based on the spatial mapping relationship, determine the first damper opening value for the wind zone (7) corresponding to the high temperature region, and determine the second damper opening value for the remaining wind zones (7) that do not correspond to the high temperature region. The first damper opening value is greater than the second damper opening value. S5. Based on the determined opening value of each damper, control the opening of the controllable damper (8) at the air inlet of each air zone (7) to perform the opening adjustment.

12. The control method for the intelligent air-cooled system of aggregate bins based on temperature field feedback according to claim 11, characterized in that, In step S1, the temperature distribution image is obtained by an infrared thermal imager (2) installed on the top of the aggregate bin body (1), and the temperature data of the temperature sensor (4) buried inside the material pile (3) or installed at the outlet of the aggregate bin body (1) are collected simultaneously, and the temperature data of the temperature distribution image are fused and calibrated.

13. The control method for the intelligent air-cooled system of aggregate bins based on temperature field feedback according to claim 11, characterized in that, In step S3, the surface of the material pile (3) is divided into multiple grid units, and a spatial mapping relationship is established between each grid unit and at least one wind zone (7). The wind zone (7) corresponding to the high temperature area is determined through the grid unit.

14. The control method for the intelligent air-cooled system of aggregate bins based on temperature field feedback according to claim 11, characterized in that, It also includes a closed-loop feedback step, specifically including: After waiting for a preset scanning cycle, repeat steps S1 to S5 until the overall temperature of the material pile (3) reaches the preset target cooling temperature and the temperature distribution is uniform.

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