Green grain storage system and method for controlling temperature of upper layer of grain by local air circulation in air bag

Abstract

A green grain storage system for controlling temperature of upper layer grain by local air circulation in air bag, which adopts a temperature control mode of mainly controlling temperature of surface layer grain and secondarily controlling temperature of warehouse by setting a heat preservation air bag above the surface of grain pile, a local air circulation pipe network in the grain pile and a booster air conditioner, reduces the number of air conditioners and the energy consumption of temperature control by reducing the space range of regulated temperature, and improves the heat preservation efficiency by preventing direct heat exchange between surface layer grain and air in the warehouse through the heat preservation air bag, so as to save the investment cost and the operation energy consumption.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology for tall, flat-roofed grain storage warehouses, and in particular to a fumigation-free, green, near-low-temperature grain storage system and method for controlling the temperature of upper-layer grain through localized micro-wind circulation within airbags. Background Technology

[0002] In conventional, tall, flat grain storage warehouses, after experiencing rising temperatures and high-temperature seasons, the average surface temperature of the grain pile approaches 26-28℃, with the highest reaching 29.5-32.5℃, while the average internal temperature is only about 13-15℃, exhibiting a typical "cold core, hot skin" phenomenon. Areas where the grain temperature exceeds 17℃ for extended periods are prone to insect infestation and microbial growth, leading to heating and mold development, and further producing aflatoxin, vomitoxin, and zearalenone toxins. This necessitates chemical fumigation, resulting in unsanitary residues and severely degrading grain quality. Areas where the grain temperature exceeds 20℃ for extended periods experience a rapid increase in the fatty acid value of rice or corn, significantly reducing edible quality. With societal development, green grain storage is gradually becoming a new requirement for grain reserves, and one of the key technologies for achieving green grain storage is controlling the grain pile temperature within a specific range.

[0003] Currently, for tall, single-story grain warehouses with a ceiling height of 2 meters, the main method for controlling the surface grain temperature is to install pressurized air conditioners with appropriate cooling capacity and quantity between the warehouses. This controls the surface grain temperature by regulating the warehouse temperature. However, for tall, single-story grain warehouses with zigzag roof trusses or other tall, single-story grain warehouses without horizontal roofs, the warehouse space volume is more than twice that of the former. To achieve the same temperature control target, the existing model of controlling the warehouse temperature as the primary method and controlling the surface grain temperature as a secondary method requires more than twice the number of air conditioners, and the energy consumption for operating the grain temperature control is also more than twice that of the former, which is very uneconomical. Furthermore, installing more than twice the number of air conditioners further increases the difficulty and labor intensity for grain warehouse management personnel in starting and stopping the equipment on-site at night.

[0004] To address the aforementioned issues, there is an urgent need to provide a surface grain temperature control system and method that primarily focuses on directly reducing surface grain temperature while indirectly controlling warehouse temperature, thereby reducing equipment investment and air conditioning energy consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a system and method for precisely regulating the surface grain temperature by localized micro-wind circulation in an air-conditioned chamber, in order to solve the technical problem of high energy consumption in current grain warehouse air conditioning temperature control and to achieve green, near-low-temperature grain storage without fumigation.

[0006] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:

[0007] A green grain storage system that controls the temperature of upper grain by localized micro-wind circulation within an airbag is characterized by including a control system, a localized micro-wind circulation network, a dedicated air conditioner for grain storage, a monitoring and control terminal, and an insulated airbag.

[0008] The heat-insulating airbag is a thin film structure that is connected to the warehouse wall, separating the grain warehouse into two spaces: the warehouse room and the grain pile.

[0009] The dedicated air conditioner for grain storage is installed outside the storage area and connected to the local micro-air circulation network through the external air supply main and the external air return main. The area of ​​grain surface covered by the cold air from a single dedicated air conditioner is an independent temperature control zone, and the surface grain temperature is controlled by zone. The air supply main is equipped with an electric valve, and the air return main is equipped with an electric valve. Both the electric valve and the electric valve are equipped with relevant limit sensors and open limit sensors.

[0010] The local micro-air circulation network is installed under the heat-insulating airbag, and the layout of the local micro-air circulation network is determined according to the width of the grain silo.

[0011] The measurement and control terminal is connected to the control system. The measurement and control terminal includes: an LCD display control screen, an LCD screen communication module, a network communication module, a wireless communication module, an EMC protection module, a 485 communication module, a MODBUS module, a temperature and humidity module, a central processing unit, a current management module, and a safety protection module.

[0012] The power supply of the grain depot-specific air conditioner is connected to a relay via an AC contactor, and the relay is connected to a power management module.

[0013] The temperature and humidity module is connected to a grain condition detection module, which includes a grain pile temperature and humidity cable, a grain pile temperature measuring cable, and a warehouse temperature and humidity sensor installed in the grain pile, as well as a temperature and humidity sensor installed outside the grain warehouse; the data collected by the grain condition detection module enables the automatic control of the grain warehouse's dedicated air conditioner.

[0014] The control system integrates mathematical control models for analysis and decision-making, as well as logical control processes, enabling the system to make intelligent decisions to regulate the surface grain temperature, while also having protection mechanisms to ensure safe operation of the equipment and fault tolerance mechanisms for equipment failures.

[0015] Furthermore, when the width of the grain silo is no more than 16 meters, the local micro-air circulation network includes supply air branch pipes and return air branch pipes. The supply air branch pipes are connected to the main supply air pipe outside the silo, and the return air branch pipes are connected to the main return air pipe outside the silo. The supply air branch pipes and return air branch pipes are both horizontally arranged along the silo wall and are arranged on opposite silo walls.

[0016] Furthermore, when the width of the grain silo is greater than 16 meters, the local micro-air circulation network includes supply air branch pipes and return air branch pipes. The supply air branch pipes are connected to the main supply air pipe outside the silo, and the return air branch pipes are connected to the main return air pipe outside the silo. The return air branch pipes are respectively installed on opposite silo walls, and the supply air branch pipes are installed in the middle of the grain silo parallel to the return air branch pipes.

[0017] When the width of the grain warehouse is greater than 16 meters, the two areas sharing the air supply branch pipe are considered as related areas.

[0018] A green grain storage method that uses localized micro-wind circulation within airbags to control the temperature of upper grain layers includes the following steps:

[0019] Step A: In the preparation stage, the external air circulation inside and outside the granary is cut off, forming an internal circulation working environment required to regulate the surface grain temperature within the heat-insulating airbag using local micro-wind circulation of air conditioning; adopting a zoned control method, the grain surface covered by the cold air of a single grain warehouse air conditioner is taken as an independent temperature control zone, and the grain surface in the granary is physically divided into multiple areas.

[0020] Step B: Collect grain condition data and air conditioning operation status in each area through hardware devices to determine whether the conditions for starting the surface cooling task in that area are met;

[0021] Step C: Perform air conditioner start-up control and operation parameter settings;

[0022] Step D: Run the equipment in a multi-threaded parallel manner in different rooms and areas, and regulate the cooling process within the area by time control and event control.

[0023] Furthermore, step A specifically includes the following steps:

[0024] A01: Deployment of airbags, control system, and local micro-air circulation network;

[0025] A02: Close the ventilation facilities inside and outside the original grain warehouse;

[0026] A03: Within a defined area, establish a local micro-wind circulation temperature control system and establish a one-to-one correspondence between the area, the booster air conditioner, the return air electric valve, and the supply air electric valve.

[0027] Furthermore, step B specifically includes the following steps:

[0028] B02: Acquire and record data, including but not limited to: real-time grain condition data, air conditioning operating status, air conditioning return air temperature, and air conditioning supply air temperature;

[0029] B03: Analyze whether the current environment is relatively high or relatively low, and combine the mathematical control model for starting / stopping the task of reducing surface grain temperature to determine whether the conditions for starting the task of reducing surface grain temperature are met.

[0030] If the condition is met, proceed to step C; otherwise, proceed to step B04.

[0031] B04: Execute the inner loop of step B: acquire real-time data at intervals of 2t2 and run step B03.

[0032] Furthermore, step C: performing air conditioner start-up control and operating parameter setting includes the following: determining whether the air conditioner start-up conditions are met, managing equipment faults, determining whether there are related areas in the temperature control zone, starting the air conditioner and setting the air conditioner operating parameters;

[0033] Specifically, a lower return air target temperature is set in low-temperature environments to increase the air conditioning operating time; a higher return air target temperature is set in high-temperature environments to shorten the air conditioning operating time; while ensuring the overall target temperature, the time the air conditioner operates in a high-energy-consumption state is shortened, thus saving air conditioning energy consumption.

[0034] Furthermore, step C includes:

[0035] C01: Based on the air conditioner startup mathematical model, determine whether the air conditioner startup conditions are met. If not, execute C02; otherwise, execute C04.

[0036] C02: Execute C03 after interval t2;

[0037] C03: After obtaining the air conditioner's operating status, return air temperature, and supply air temperature, execute C01;

[0038] C04: Determine if the air conditioner is faulty based on fault and maintenance records. If there is a fault, proceed to C05; otherwise, proceed to C06.

[0039] C05: Execute C02 after triggering an alarm;

[0040] C06: Based on the closing limit sensor and opening limit sensor of the electric valve, determine whether the electric valve has an opening fault. If there is a fault, execute C05; otherwise, execute C07.

[0041] C07: Further determine whether the area has any related areas. If there are related areas, execute sub-process D01 Related Area Management Process; otherwise, execute C08.

[0042] C08: Start sub-process C08 air conditioner start control logic process, then execute C09;

[0043] C09: Further determine whether the air conditioner is powered on successfully. If unsuccessful, return to C02; if successful, execute C10.

[0044] C10: Set the fine-tuning value to 0 and then execute C11;

[0045] C11: After starting the C11 subprocess parameter setting process, execute C12;

[0046] C12: Instruction to start the air conditioner. After the air conditioner starts working under the control of the PLC program, the compressor, evaporator, condenser and other equipment enter the working state, execute C13;

[0047] C13: After obtaining the air conditioner operating status, air conditioner return air temperature, air conditioner supply air temperature, return air target temperature, air conditioner start / stop temperature difference, and smart meter electricity consumption, execute C14.

[0048] C14: After setting T=0 to start timing, execute time control and proceed to step D;

[0049] The D01 associated area management adopts the principle of prioritizing the activation of air conditioning in areas with high average surface grain temperature, no electric valve malfunctions, no air conditioning malfunctions, and no sudden drop in return air temperature, in order to prevent localized excessive cooling and localized high temperatures from affecting the temperature control effect.

[0050] The C11 parameter settings are configured according to whether the air conditioner is operating in a relatively high-temperature or relatively low-temperature environment.

[0051] Furthermore, step D includes six sub-processes: C15, C19, C25, C27, C29, and C30.

[0052] The specific time parameter settings involved in time control in step D are as follows:

[0053] t1: Air conditioner fault diagnosis interval, reference value 1 minute;

[0054] t2: Grain condition detection interval, reference value 5 minutes;

[0055] t3: The longest continuous operating time for the air conditioner, with a reference value of 360 minutes;

[0056] t4: Duration of pause during normal air conditioning operation, reference value 15 minutes;

[0057] t5: Duration of pause due to inefficient air conditioning operation, reference value 150 minutes;

[0058] 2t2: Interval time for surface cooling task control;

[0059] 3t2: Interval time for judging abnormal supply air temperature;

[0060] 6t2: Time for judging air supply temperature difference adjustment;

[0061] The time control is specifically as follows: when T=t3, C15 is executed; when T=N*6t2, C19 is executed; when T=N*3t2, C25 is executed; when T=N*2t2, C27 is executed; when T=N*t2, C29 is executed; and when T=N*t1, C30 is executed, so that the system executes different processes in different time periods, and each process is responsible for executing different event control.

[0062] The event management includes: time management, equipment failure management, operating environment analysis, air conditioning operating parameter settings, air conditioning inefficient operation analysis, air conditioning standby management, and air conditioning shutdown management.

[0063] Furthermore, the sub-process C30 includes air conditioner standby management, as well as time management, air conditioner fault management, air conditioner shutdown management, and air conditioner shutdown post-shutdown management related to air conditioner standby management;

[0064] Every interval t1, the real-time operating parameters of the air conditioner are obtained to determine whether the air conditioner is operating normally.

[0065] If running normally, select to execute subprocess C15, C19, C25, C27 or C29 according to the time parameter;

[0066] If abnormal operation occurs, check whether the air conditioner's standby status is normal, and manage the air conditioner's faults, shutdown, and post-shutdown based on the standby status.

[0067] The sub-process C29 includes air conditioning pause control and return air temperature drop control, as well as related time control, air conditioning shutdown control and air conditioning shutdown post-shutdown control;

[0068] Every t2, real-time grain conditions are obtained to determine whether the conditions for suspending air conditioning are met.

[0069] If the conditions are not met, sub-processes such as C15, C19, C25, and C27 will be executed according to the time parameters. If there are related areas, it is necessary to determine whether the return air temperature has dropped sharply. If the conditions are met, it is necessary to perform shutdown air conditioning control and post-shutdown air conditioning control.

[0070] The sub-process C27 is for the management and control of surface cooling tasks, air conditioning suspension and inefficient air conditioning operation, as well as related time management, return air temperature drop management, air conditioning shutdown management and post-shutdown management.

[0071] Every 2t2, real-time grain conditions are obtained to determine whether the surface grain temperature cooling task has been completed.

[0072] If the condition is met, then the air conditioning shutdown control and post-shutdown control will be implemented; if the condition is not met, then it will be determined whether the air conditioning shutdown conditions are met; if the air conditioning shutdown conditions are met, first determine whether the return air temperature drops suddenly based on whether there are related areas, and then the air conditioning shutdown control and post-shutdown control will be implemented.

[0073] If the conditions for suspending the air conditioner are not met, determine whether the air conditioner is operating inefficiently. If it is not operating inefficiently, first adjust the air conditioner operating parameters according to the relatively high or low temperature environment, and then select and execute sub-processes such as C15, C19, and C25 according to the time parameters. If it is operating inefficiently, then perform air conditioner shutdown management and air conditioner shutdown post-shutdown management.

[0074] The sub-process C25 includes air conditioning suspension control and air conditioning inefficient operation control, as well as related time control, return air temperature drop control, air conditioning shutdown control and air conditioning shutdown post-shutdown control;

[0075] Every 3t2, real-time grain conditions are obtained to determine whether the conditions for suspending air conditioning are met;

[0076] If the conditions for suspending the air conditioning are met, first determine whether there is a sudden drop in return air temperature based on whether there are related areas, and then implement the control of air conditioning shutdown and post-shutdown management; if the conditions for suspending the air conditioning are not met, determine whether the air conditioning is operating inefficiently.

[0077] If not operating inefficiently, first adjust the air conditioning operating parameters according to the relatively high or low temperature environment, and then select to execute sub-process C15 or C19 according to the time parameter; if operating inefficiently, then perform air conditioning shutdown control and air conditioning shutdown post-shutdown control.

[0078] The sub-process C19 includes control over surface cooling tasks, control over air conditioning suspension and control over inefficient air conditioning operation, as well as related time control, control over sudden drop in return air temperature, control over air conditioning shutdown and control after air conditioning shutdown.

[0079] Subprocess C15 is for the management and control of air conditioner operation exceeding time limits, as well as related time management, air conditioner shutdown management and air conditioner shutdown post-shutdown management.

[0080] The technical solution of the present invention has the following advantages:

[0081] 1. By installing heat-insulating airbags above the surface of the grain pile, a local micro-air circulation network inside the grain pile, and pressurized air conditioning, a temperature control mode is adopted that primarily controls the surface grain temperature and secondarily controls the warehouse temperature. This reduces the number of air conditioners required and lowers temperature control energy consumption by narrowing the temperature control range. Furthermore, the heat-insulating airbags prevent direct heat exchange between the surface grain and the air in the warehouse, thus improving heat preservation efficiency. This achieves the goal of saving input costs and operating energy consumption.

[0082] 2. The monitoring and control terminal controls the working status of the corresponding booster air conditioner and electric valve based on the comparison results of the supply air temperature and humidity and return air temperature and humidity of the booster air conditioner and the target control temperature and humidity determined based on the data in the grain warehouse. It also automatically controls the electric valve and booster air conditioner to carry out local micro-wind circulation temperature control operation based on remote communication, which solves the difficulty of starting and stopping the grain warehouse management personnel at night, reduces labor intensity, and automatically reduces the working time of the air conditioner during high temperature periods and increases the working time during low temperature periods according to environmental conditions, thereby further reducing the energy consumption of air conditioner operation.

[0083] 3. During the cold season, ventilation lowers the average grain temperature to 8-10℃, providing the prerequisite for low-temperature grain storage. During the rising temperature season and the high temperature season, the air conditioning supply and return air duct network inside the grain surface film insulation airbag is used to control the local micro-air circulation temperature, preventing the surface grain temperature from rising rapidly and keeping the surface grain temperature and the surrounding grain temperature below 17℃. Low-temperature grain storage is achieved throughout the warehouse: the average grain temperature does not exceed 15℃ and the maximum grain temperature does not exceed 20℃, completely solving the problem of "cold core and hot skin". Attached Figure Description

[0084] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0085] Figure 1 A schematic diagram of the airbag-in-air conditioning system for regulating the surface grain temperature provided by the present invention.

[0086] Figure 2 A schematic diagram of the local micro-air circulation duct network layout when the warehouse width is small, as provided by the present invention;

[0087] Figure 3 A schematic elevation view of the local micro-air circulation duct network layout when the grain pile width is small, as provided by the present invention.

[0088] Figure 4 A schematic diagram of the local micro-air circulation duct network layout when the warehouse width is large, as provided by the present invention;

[0089] Figure 5 A schematic elevation view of the local micro-air circulation duct network layout when the grain pile width is large, as provided by the present invention.

[0090] Figure 6 This is a schematic diagram of the main control process for regulating the surface grain temperature using an air-conditioning system within an airbag, as provided by the present invention.

[0091] Figure 7 This is a schematic diagram of the sub-process "Associated Area Management Process D01";

[0092] Figure 8 This is a schematic diagram of the sub-process "Management Process for Sudden Drop in Return Air Temperature D02";

[0093] Figure 9 A schematic diagram of the sub-process "Parameter Setting Process C11";

[0094] Figure 10 This is a schematic diagram of the sub-process "Air Conditioner Start-up Control Logic Flow C08";

[0095] Figure 11 This is a schematic diagram of the sub-process "Air Conditioner Shutdown Control Logic Flow C17";

[0096] Figure 12 This is a schematic diagram of the sub-process "Air Conditioner Shutdown Management Process C18".

[0097] 3. Air conditioner; 4. External air supply main pipe; 41. Internal air supply main pipe; 5. Air supply branch pipe; 6. Return air branch pipe; 7. Internal return air main pipe; 8. External return air main pipe; 9. Return air temperature and humidity sensor; 10. Air supply temperature and humidity sensor; 11. Warehouse wall. Detailed Implementation

[0098] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0099] Example 1

[0100] like Figures 1-5 As shown, the green grain storage system, which controls the temperature of the upper grain layer by local micro-wind circulation within the airbag, includes a control system, a local micro-wind circulation pipeline network, a dedicated air conditioner for grain storage, a monitoring and control terminal, and an insulated airbag.

[0101] in Figure 1 , Figure 2 and Figure 4 The direction indicated by the middle arrow is the airflow circulation direction.

[0102] The heat-insulating airbag is a thin-film structure connected to the silo wall 11, separating the grain silo into two spaces: the storage area (the space from the grain loading line to the top of the silo) and the grain pile. The heat-insulating airbag consists of a thin-film airbag on the grain surface and PE insulation cotton. The thin-film airbag and PE insulation cotton are stacked together to form an independent area for the grain pile, reducing the volume of the temperature-controlled space.

[0103] In specific implementation of this invention, the method for manufacturing the heat-insulating airbag is as follows: a groove is cut above the grain loading line on the silo wall 11 and a fixed plastic insert is embedded. The gap between the insert and the wall is sealed with plastic to form an airtight whole. The film is cut according to the size of the grain surface and heat-welded into a whole film. The film is pressed into the insert using a plastic tube. The method of covering the heat-insulating airbag is to first cover the grain surface with the film and then cover it with PE insulation cotton. The covering method can prevent the cold air from the air conditioner 3 from directly entering the silo. The cooling capacity of the air conditioner 3 is mainly used to control the surface grain temperature. Due to the temperature difference between the surface grain temperature and the silo temperature, the heat conduction effect indirectly controls the silo temperature. The smooth surface of the film avoids the PE insulation cotton from directly covering and increasing the ventilation resistance. The PE insulation cotton has heat insulation capacity and maintains a lower surface grain temperature as much as possible. The heat-insulating airbag is placed on top of the grain surface. The heat-insulating airbag isolates the silo from the grain pile and limits the flow of the cold air from the air conditioner 3 to the surface of the grain pile, so as to achieve the main control of the surface grain temperature and the secondary control of the silo temperature.

[0104] The grain silo-specific air conditioner 3 is installed outside the silo and connected to a local micro-air circulation network via the main supply air pipe, return air pipe, and the area of ​​grain surface covered by the cold air from a single grain silo-specific air conditioner 3 is an independent temperature control zone. The surface grain temperature is controlled by zone, such as... Figure 2 and Figure 4 The area is shown in the dashed box. The main air supply pipe is equipped with a power supply valve, and the main return air pipe is equipped with a power return air valve. The opening of the main air supply pipe of the grain silo-specific air conditioner 3 inside the grain silo is the air supply outlet, and the opening of the main return air pipe of the grain silo-specific air conditioner 3 inside the grain silo is the air return outlet. The air supply outlet and the air return outlet are respectively equipped with a return air temperature and humidity sensor 9 and a supply air temperature and humidity sensor 10, which can be used to collect the supply air temperature and humidity and return air temperature and humidity of the grain silo-specific air conditioner 3. Simultaneously, the power valves are closed during grain pile fumigation to prevent corrosive toxic gases from entering the air conditioner 3 and corroding its components. On the other hand, when the air conditioner 3 is shut down, the power valves are closed to block the convection heat exchange between the hot gas inside the air conditioner 3 and the cold air on the surface of the grain pile, maintaining a relatively low surface temperature as much as possible. Both the power supply valve and the power return air valve are equipped with relevant limit sensors and open limit sensors.

[0105] The measurement and control terminal is connected to the control system, which embeds several mathematical models. The measurement and control terminal includes: an LCD display control screen, an LCD screen communication module, a network communication module, a wireless communication module, an EMC protection module, a 485 communication module, a MODBUS module, a temperature and humidity module, a central processing unit, a current management module, and a safety protection module. The power supply of the grain warehouse-specific air conditioner 3 is connected to a relay via an AC contactor, and the relay is connected to the power management module. The power cord of the air conditioner 3 is connected to an electromagnetic AC contactor, and the power supply and de-energization of the electromagnetic AC contactor are controlled by the relay, which is connected to the power management module of the measurement and control terminal.

[0106] The control system integrates air conditioning start-up control logic sub-flows and air conditioning shutdown control logic sub-flows into the main process to automate equipment control during surface grain temperature operations. It possesses protection mechanisms to ensure safe equipment operation and fault tolerance mechanisms. Furthermore, by integrating event management sub-flows into the main process, it automates the process of reducing surface grain temperature.

[0107] The main process of the control system integrates a mathematical control model for analysis and decision-making, which has the intelligent decision-making capability to regulate the surface grain temperature.

[0108] The mathematical control model for regulating surface grain temperature includes, but is not limited to, a sudden drop in air temperature analysis model, a regional surface cooling task start / stop mathematical control model, an air conditioning start / stop mathematical control model, a return air temperature sudden drop analysis model, and an air conditioning inefficient operation analysis model.

[0109] The mathematical control model for regulating surface grain temperature employs a control index system that includes, but is not limited to, high / low temperature periods, real-time grain conditions, historical air temperatures, the difference between the target and controlled surface grain temperature, the target return air temperature and the start / stop temperature difference of the air conditioning system, the real-time operating status of the air conditioning system, the real-time operating status of the electric valve, the real-time operating parameters of the air conditioning system, event control time, equipment failure, sudden drop in return air temperature, inefficient operation of the air conditioning system, and supply air temperature difference.

[0110] In specific implementation, the mathematical control model for starting / stopping the regional surface cooling task is as follows:

[0111] Specifically, the conditions for initiating the regional surface cooling task are as follows:

[0112] Condition 1: During periods of high temperature and not during sudden drops in temperature, the mathematical control model for task activation includes, but is not limited to: the average surface grain temperature in the area ≥ the target average surface grain temperature control + the control temperature difference, or the highest surface grain temperature in any area between granaries ≥ the target highest surface grain temperature control.

[0113] Condition 2: During periods of low temperature or when the temperature drops sharply, the mathematical control model for the task activation includes, but is not limited to: average surface grain temperature ≥ average surface grain temperature control target - control temperature difference, or highest surface grain temperature ≥ highest surface grain temperature control target.

[0114] Specifically, the conditions for suspending the regional surface cooling mission are as follows:

[0115] Condition 1: During periods of high temperature and not during sudden drops in temperature, the mathematical control model for mission suspension includes, but is not limited to: regional average surface grain temperature ≤ surface average grain temperature control target.

[0116] Condition 2: During periods of low temperature or when the temperature drops suddenly, the task is suspended. The mathematical control model includes, but is not limited to: the average surface grain temperature in any area of ​​the granary is ≤ the surface average grain temperature control target - 2 * control temperature difference.

[0117] In the specific implementation of this invention, the target for controlling the average surface grain temperature, the target for controlling the highest surface grain temperature, and the control temperature difference between each storage facility are manually set according to the grain variety and the moisture content of the surface grain.

[0118] In practical implementation, the high-temperature period and low-temperature period are manually set and modified according to the geographical location of the grain depot and seasonal changes.

[0119] In a specific implementation of this invention, the temperature drop analysis model is as follows:

[0120] Modeling process:

[0121] Extract historical temperature data (May to October) for the reservoir area over many years. In the monthly data, distinguish between normal temperature data and data with sudden temperature drops based on common sense. Utilize artificial intelligence to establish a preliminary model for analyzing sudden temperature drops.

[0122] Data Analysis: The temperature drop analysis model determines whether there is a sudden drop in temperature based on real-time temperature data.

[0123] Model refinement process:

[0124] Historical temperature data only includes daily average high and low temperatures, resulting in a low data volume. The preliminary model is sensitive to the magnitude of the values ​​but not to the rate of temperature change, leading to low accuracy in the analysis results.

[0125] Localized micro-wind circulation temperature control software acquires and records grain conditions at 2t2 intervals, increasing the amount of data and improving the sensitivity of analysis results to the rate of temperature change;

[0126] When the analysis results deviate, manual correction is performed (data correction table), and the analysis model for sudden temperature drops is continuously improved;

[0127] When the data collected is more than three years old, delete the historical temperature data used in the initial modeling and then improve the model.

[0128] In a specific implementation of this invention, the mathematical control model for air conditioner start / stop is as follows:

[0129] Specifically, the mathematical control model for air conditioner startup is: real-time return air temperature ≥ target return air temperature + start-stop temperature difference;

[0130] Specifically, the mathematical control model for air conditioner shutdown is: real-time return air temperature ≤ return air target temperature - start-stop temperature difference;

[0131] Specifically, during high-temperature periods and when the temperature does not drop suddenly, the return air target temperature = the return air target temperature of air conditioner 3 = the surface average grain temperature control target - the control temperature difference;

[0132] Specifically, during periods of low temperature or when the temperature drops sharply, the return air target temperature = the surface average grain temperature control target - 4 * control temperature difference;

[0133] Specifically, the temperature difference between the start and stop of the air conditioner is manually set in the local micro-wind circulation temperature control software, according to the air conditioner's operation manual.

[0134] In practical implementation, the air conditioning parameter setting process automatically sets, modifies, and records the return air target temperature according to environmental changes.

[0135] In specific implementations of this invention, equipment fault management is as follows:

[0136] Ventilation equipment malfunction only records the alarm; it does not affect the start / stop of the air conditioner.

[0137] Electric valve malfunctions include opening malfunctions and closing malfunctions. When the opening malfunction occurs, the internal circulation air path of air conditioner 3 is blocked, and air conditioner 3 cannot be started; the closing malfunction does not affect the starting / stopping of air conditioner 3.

[0138] Air conditioner fault 3 includes power supply failure and operational failure, and cannot start air conditioner 3;

[0139] Air Conditioner 3 operation failure refers to the phenomenon of abnormal standby before the conditions for stopping Air Conditioner 3 are met. The system performs an Air Conditioner 3 operation failure analysis every t1 interval. The "Fault / Maintenance Record Form" records the time of operation failure and fault code. Management can refer to the fault code corresponding to the fault phenomenon in the Air Conditioner 3 instruction manual for targeted maintenance.

[0140] After a fault is fixed, the administrator selects "not maintained" to "maintained" in the system's "Fault / Maintenance Record Form". The system then uses this information to make decisions during the cooling operation.

[0141] Before the fault maintenance is completed, the system will issue an alarm to the relevant management personnel at certain intervals to draw their attention.

[0142] In practical implementation, the analysis model for the sudden drop in return air temperature in this invention is as follows:

[0143] Specifically, the "Operation Record Table" records the return air temperature of air conditioner 3 at every interval t2 when it starts, runs, and stops. The rate of return air temperature drop after all air conditioners 3 start is analyzed, and the rate with large dispersion is filtered out. The rate of return air temperature drop is within the normal range. If the real-time cooling rate of air conditioner 3 is higher than the upper limit of the normal range, it is judged as "sudden drop in return air temperature".

[0144] In a specific implementation of this invention, the inefficient operation analysis model for air conditioner 3 is as follows:

[0145] For different brands and power ratings, an inefficient operation analysis model for air conditioners should be established that suits their own characteristics; for the same brand and power rating, the model should be the same.

[0146] When the same brand and power air conditioner 3 is running normally, the supply air temperature varies within a certain range. The inefficient operation analysis model of air conditioner 3 can determine the normal supply air temperature range for different operating environments by analyzing the supply air temperature of two operating environments and filtering out high temperature values ​​with large dispersion.

[0147] If the air supply temperature of air conditioner 3 is consistently higher than the normal air supply temperature range of the current operating environment during continuous operation, then air conditioner 3 will operate inefficiently.

[0148] For air conditioner 3 that is operating inefficiently, immediately disconnect the power to air conditioner 3, close the electric valve, and restart after a shutdown time of up to t5.

[0149] If the air supply temperature returns to the normal range after restarting an inefficiently operating air conditioner 3, it is not considered an operational malfunction. However, if the air supply temperature remains above the normal range, it should be managed as an operational malfunction of air conditioner 3.

[0150] In the specific implementation of this invention, the reasonableness of the supply air temperature difference is determined as follows:

[0151] The temperature difference between the average surface temperature of the grain and the supply air temperature should be appropriate, and the difference between the two should not be less than the supply air temperature difference in order to produce a cooling effect.

[0152] The temperature difference of the air supply should not be too large, because when the cooling capacity of an air conditioner is fixed, the lower the air supply temperature, the smaller the air supply volume.

[0153] When the average grain temperature on the surface of the area minus the supply air temperature is less than the supply air temperature difference, the target return air temperature can be appropriately reduced to lower the supply air temperature.

[0154] The temperature and humidity module is connected to a grain condition detection module, which includes a grain pile temperature and humidity cable, a grain pile temperature measuring cable, a warehouse temperature and humidity sensor, and a temperature and humidity sensor located outside the grain warehouse.

[0155] In a specific implementation of this invention, when the monitoring and control terminal receives a command to start an air conditioner 3, it first instructs the power management module to supply power to the relay corresponding to the air conditioner 3. The relay supplies power to the electromagnetic coil of the AC contactor. Under the action of magnetic force, the iron core of the AC contactor is attracted and conducts the main power supply circuit of the air conditioner 3. The monitoring and control terminal then sends a start command to the PLC board of the air conditioner 3. When the monitoring and control terminal receives a command to stop an air conditioner 3, it first instructs the power management module to de-energize the relay corresponding to the air conditioner 3. The electromagnetic AC contactor is disconnected, the main power supply circuit of the air conditioner 3 is disconnected, and the air conditioner stops.

[0156] When the surface grain temperature is higher than the start-up temperature, the monitoring and control terminal supplies power to the booster air conditioner 3. Then, under the automatic control of the PLC program, the air conditioner 3 operates automatically based on the relationship between the real-time return air temperature, the return air target temperature, and the start-stop temperature difference. When the surface grain temperature is lower than the control target temperature, the monitoring and control terminal cuts off the power to the booster air conditioner 3.

[0157] In a specific implementation of this invention, the monitoring and control terminal can integrate air conditioners, electric valves, and other automated equipment from multiple storage rooms.

[0158] The localized micro-air circulation network includes supply air branch pipes 5 and return air branch pipes 6. The supply air branch pipes 5 are connected to the main external air supply pipe 4. This localized micro-air circulation network is located inside the grain pile, installed on the surface of the grain pile under the airbag, 30cm away from the grain pile surface. The functions of this localized micro-air circulation network are twofold: first, to evenly distribute the cool air from the air conditioner 3 to the surface of the grain pile, directly reducing the surface grain temperature, rather than sending cool air to the storage area as in traditional cooling equipment, thus indirectly reducing the storage temperature and consequently the grain temperature; second, to collect the hot air that has absorbed heat across the grain surface and return it to the air conditioner 3. Ultimately, this forms an internal airflow circulation under the airbag, directly reducing the surface grain temperature.

[0159] In this embodiment, when the warehouse width and span are small (width not exceeding 16m) and the ventilation resistance is not greater than 450Pa, a supply and return air duct network with side supply and other side return air is adopted using air conditioner 3 installed on warehouse wall 11. The return air branch pipe 6 is connected to the main return air duct 8 outside the warehouse, and one air conditioner 3 is responsible for one set of local micro-air circulation duct network. The supply air branch pipe 5 and the return air branch pipe 6 are both horizontally set along the warehouse wall 11, and are set on opposite warehouse walls 11. The supply air branch pipe 5, the return air branch pipe 6, and the main return air duct 7 inside the warehouse are installed below the surface of the grain pile. The supply air branch pipe 5 inside the warehouse is connected to the main supply air duct 4 outside the warehouse, the return air branch pipe 6 inside the warehouse is connected to the main return air duct 7 inside the warehouse, and the main return air duct 7 inside the warehouse is connected to the main return air duct 8 outside the warehouse.

[0160] The supply air branch pipe 5 uses a 159mm inner diameter PVCA pipe, connecting to the main supply air pipe of air conditioner 3. The side wall of supply air branch pipe 5 has a 3.5mm opening, protected with wire mesh to prevent grain leakage. The opening ratio of different pipe sections is adjusted to ensure even air distribution. It is fixedly installed on the inner wall of warehouse wall 11 and does not require disassembly for storage operations. The return air branch pipe 6 uses a 159mm inner diameter PVCA pipe, with a 3.5mm opening on the side wall, protected with wire mesh to prevent grain leakage. The opening ratio of different pipe sections is adjusted to ensure even air distribution. It is fixedly installed on the inner wall of warehouse wall 11 opposite air conditioner 3 and does not require disassembly for storage operations. The warehouse return air main pipe 7 uses a 315mm or 400mm inner diameter PVCA pipe, without openings. It is installed after the warehouse is full of grain and disassembled before storage. The external supply and return air main pipes use 315mm or 400mm inner diameter PVCA pipes, without openings, and are fixedly installed.

[0161] Example 2

[0162] like Figure 4 As shown, when the warehouse span is large and the ventilation resistance is greater than 450Pa, a supply and return air duct network with central air supply and side return air is adopted. The two air conditioners 3 share the supply air branch pipe 5. The local micro-air circulation duct network includes supply air branch pipe 5 and return air branch pipe 6. The supply air branch pipe 5 is connected to the main supply air duct 4 outside the warehouse, and the return air branch pipe 6 is connected to the main return air duct 8 outside the warehouse. The return air branch pipes 6 are respectively set on the opposite warehouse walls 11, and the supply air branch pipe 5 is set in the middle of the grain warehouse parallel to the return air branch pipe 6.

[0163] The air supply branch pipe 5 uses a PVCA pipe with an inner diameter of 200mm and a 3.5mm opening in the side wall. It is protected with wire mesh to prevent grain leakage. The opening ratio of different pipe sections is adjusted to ensure even air distribution. It is installed after the grain warehouse is full and disassembled before grain is removed. The main air supply pipe 41 inside the warehouse uses a PVCA pipe with an inner diameter of 315mm or 400mm, without openings. It is installed after the grain warehouse is full and disassembled before grain is removed. All the above pipes are submerged below the grain surface, with the center of the pipe 300mm away from the grain surface. Electric valves are installed on the main air supply and return pipes outside the warehouse to prevent damage to the air conditioning unit 3 during fumigation and to prevent short circuits in the ventilation system during full warehouse ventilation.

[0164] The total length of the supply air branch pipe 5 and return air branch pipe 6 connected to each pressurized air conditioner 3 generally does not exceed 25m, and the air conditioner 3 is installed in the center of the supply air branch pipe 5 or return air branch pipe 6.

[0165] Multiple air supply holes are provided on the side wall of each air supply branch pipe 5 in the warehouse, and multiple air return holes are provided on the side wall of each air return branch pipe 6 in the warehouse. The closer to the air conditioner 3, the smaller the opening ratio of the air supply branch pipe 5 and the air return branch pipe 6 in the warehouse; the farther away from the air conditioner 3, the larger the opening ratio of the air supply branch pipe 5 and the air return branch pipe 6 in the warehouse. The uniformity of air supply is adjusted according to the opening ratio to ensure that the surface grain temperature is relatively uniform.

[0166] In practical implementation, the air conditioner 3 utilizes its own cooling capacity to provide cooling and control the surface grain temperature and warehouse temperature within a certain range. The cold air generated by the air conditioner 3 is delivered to the grain surface inside the thin-film insulation airbag via the supply air branch pipe 5. Under the negative pressure suction of the air conditioner 3's return air inlet, the air flows over the grain surface and returns to the air conditioner 3 via the return air branch pipe 6, thus creating an internal circulation to control the surface grain temperature and warehouse temperature. Whether the grain pile temperature control target, pest control target, and grain quality control target can be achieved directly depends on the cooling capacity and quantity of the air conditioners 3. The method for determining the cooling capacity and quantity configuration of the air conditioners 3 is related to the grain surface area and warehouse volume, the insulation capacity of the warehouse walls 11 and roof, and the highest summer temperature and length of the high-temperature season in the warehouse's geographical location. The installation and deployment of the air conditioners 3 depend on the width of the warehouse. When the warehouse width is small, the air conditioners 3 are installed on one side of the warehouse; when the warehouse width is large, the air conditioners 3 are installed on the front and back sides of the warehouse.

[0167] When the air conditioner 3 is working, cold air is sent to the air supply branch pipe 5 inside the warehouse and positive pressure is formed outside the pipe. At the same time, the return air branch pipe 6 inside the warehouse is in a negative pressure state. Under the action of this external residual pressure, the cold air is forced to pass through the surface of the grain pile of the air bag and reduce the surface grain temperature. The hot air after absorbing heat returns to the air conditioner 3 through the return air branch pipe 6 inside the warehouse, thus forming an internal circulation.

[0168] Traditional grain warehouse temperature control directly regulates the warehouse temperature. However, due to the low heat capacity and density of the air between warehouses, the warehouse temperature drops rapidly after the air conditioner (3) is turned on and rises quickly after it is turned off. Meanwhile, because the heat capacity of grain (approximately 1.9 KJ / Kg.℃) is about twice that of air, and the bulk density of grain is 500-680 times that of air, the surface grain temperature decreases relatively slowly. The air conditioner (3) must run for an extended period before the surface grain temperature shows a significant drop. Therefore, the adjustment values ​​for controlling temperature differences and differences in the working environment should be small and adjusted based on actual operating results.

[0169] The technical solution of this application adopts a mode in which air conditioning 3 primarily controls the warehouse temperature and secondarily controls the surface grain temperature. The air conditioning 3 within the insulating airbag regulates the surface grain temperature through localized micro-wind circulation, primarily controlling the surface grain temperature and secondarily controlling the warehouse temperature. After air conditioning 3 is activated, cold air flows between the grain grains. Due to the isolation effect of the insulating airbag and the heat insulation effect of the PE cotton, the warehouse temperature is not sensitive to changes and may even remain unchanged for a long time. Therefore, warehouse temperature cannot be used as the primary control indicator.

[0170] Example 3

[0171] A green grain storage method that uses localized micro-wind circulation within airbags to control the temperature of upper grain layers includes the following steps:

[0172] Step A: For the preparation stage, cut off the external air circulation inside and outside the granary to form an internal circulation working environment required to regulate the surface grain temperature within the heat-insulating airbag using the local micro-wind circulation of the air conditioner 3; adopt the method of zoned control, and divide the grain surface in the granary into multiple areas according to the area of ​​grain surface covered by the cold air of a single grain warehouse air conditioner 3.

[0173] Step A further includes the following steps:

[0174] A01: Deployment of airbags, control system, and local micro-air circulation network;

[0175] A02: Close the ventilation facilities inside and outside the original grain warehouse; enter the granary and close the self-ventilation equipment, such as axial flow fans, as well as the ventilation windows, axial flow windows, and ventilation openings of the grain warehouse, cut off the external air circulation inside and outside the granary, and realize the internal circulation working environment required for the local micro-wind circulation regulation of the surface grain temperature in the heat preservation airbag air conditioner 3.

[0176] A03: Within a defined area, establish a local micro-wind circulation temperature control system and establish a one-to-one correspondence between the area, the booster air conditioner 3, the return air electric valve, and the supply air electric valve.

[0177] Step B: Collect grain condition data and air conditioner 3 operating status in each area through hardware devices to determine whether the conditions for starting the surface cooling task in that area are met;

[0178] Step B specifically includes the following steps:

[0179] B01: Set time T=0, start timing;

[0180] B02: Acquire and record data, including but not limited to: real-time grain condition data, air conditioner 3 operating status, air conditioner 3 return air temperature, and air conditioner 3 supply air temperature;

[0181] B03: Analyze whether the current environment is relatively high or relatively low, and combine the mathematical control model for starting / stopping the task of reducing surface grain temperature to determine whether the conditions for starting the task of reducing surface grain temperature are met.

[0182] If the conditions are met, the "surface cooling task" for that area will be initiated, and the process will proceed to step C; otherwise, the process will proceed to step B04.

[0183] B04: Execute the inner loop of step B: acquire real-time data at intervals of 2t2 and run step B03.

[0184] Step C: Perform air conditioner 3 start-up control and operation parameter settings;

[0185] Step C specifically includes the following: determining whether the conditions for starting the air conditioner 3 are met, managing equipment faults, determining whether there are any related areas in the temperature control zone, starting the air conditioner 3 and setting the operating parameters of the air conditioner 3.

[0186] The analysis in B03, which determines whether the current environment is relatively high or low, is based on the high / low temperature period settings, data from B02, historical temperatures, temperature drop analysis models, and the regional surface cooling task start / stop mathematical control model to determine whether the "surface grain temperature" start condition is met.

[0187] The operating parameters of the air conditioner 3 are set according to whether the environment outside the grain warehouse is relatively high or relatively low.

[0188] Specifically, in low-temperature environments, a lower return air target temperature is set to increase the operating time of air conditioner 3; in high-temperature environments, a higher return air target temperature is set to shorten the operating time of air conditioner 3; while ensuring the overall target temperature, the time that air conditioner 3 operates in high-energy-consumption state is shortened, thus saving energy consumption of air conditioner 3.

[0189] Step D: Run the equipment in a multi-threaded parallel manner in different rooms and areas, and regulate the cooling process within the area by time control and event control.

[0190] In a specific implementation of the present invention, step D includes six sub-processes: C15, C19, C25, C27, C29, and C30.

[0191] The specific time parameter settings involved in time control in step D are as follows:

[0192] t1: Air conditioner fault diagnosis interval time, reference value 1 minute;

[0193] t2: Grain condition detection interval, reference value 5 minutes;

[0194] t3: The longest continuous operating time for air conditioner 3, reference value 360min;

[0195] t4: Duration of pause during normal operation of air conditioner 3, reference value 15 minutes;

[0196] t5: Duration of inefficient operation pause of air conditioner 3, reference value 150min;

[0197] 2t2: Interval time for surface cooling task control;

[0198] 3t2: Interval time for judging abnormal supply air temperature;

[0199] 6t2: Time for judging air supply temperature difference adjustment;

[0200] The specific time control is as follows: when T=t3, execute C15; when T=N*6t2, execute C19; when T=N*3t2, execute C25; when T=N*2t2, execute C27; when T=N*t2, execute C29; and when T=N*t1, execute C30. This allows the system to execute different processes at different time periods, with each process responsible for executing different event controls.

[0201] In a specific implementation of this invention, the specific event management steps in step D are as follows:

[0202] Sub-process C30 involves specific steps C03, C31, C15, C32, C33, C34, C16, and C17. Its core is the standby management of air conditioner 3, which also includes time management, fault management, shutdown management, and post-shutdown management related to the standby management of air conditioner 3: Every interval t1, the real-time operating parameters of air conditioner 3 are obtained to determine whether air conditioner 3 is operating normally; if it is operating normally, sub-processes C15, C19, C25, C27, or C29 are executed according to the time parameters; if there is abnormal standby, the cause of the air conditioner 3 fault is checked and the user is alerted until the fault is resolved; if there is abnormal standby or normal standby, shutdown management and post-shutdown management of air conditioner 3 are also required.

[0203] In this application, the method of powering off the air conditioner 3 is adopted for normal standby. The reason is that when the air conditioner 3 is in standby for a long time, on the one hand, the internal and external micro-airflow circulation of the air conditioner 3 in standby state increases the loss of cold source in the compartment, and on the other hand, the air conditioner 3 fan also consumes electricity to maintain the internal and external micro-airflow circulation.

[0204] Subprocess C29 involves specific steps C24, C20, C15, and D02. Its core is the control of suspending air conditioning 3 and the control of sudden drop in return air temperature. It also includes related time control, control of stopping air conditioning 3, and control after stopping air conditioning 3: Every interval t2, the real-time grain condition is obtained to determine whether the "condition for suspending air conditioning 3" is met. If not, subprocesses such as C15, C19, C25, and C27 are executed according to the time parameter. If there are related areas, it is necessary to determine whether there is a "sudden drop in return air temperature". If it is met, control of stopping air conditioning 3 and control after stopping air conditioning 3 are required.

[0205] Sub-process C27 involves specific steps C16, B06, B07, C20, C21, C11, C15, C17, and D02. Its core is the control of the "surface cooling task," the control of the suspension of air conditioning 3, and the control of the inefficient operation of air conditioning 3. It also includes related time control, control of sudden drop in return air temperature, control of air conditioning 3 shutdown, and control after air conditioning 3 shutdown: every 2t2, real-time grain conditions are obtained to determine the "surface grain temperature cooling task." If the condition is met, proceed with the shutdown control of Air Conditioner 3 and post-shutdown control of Air Conditioner 3. If not, determine if the "Air Conditioner 3 suspension condition" is met. If the "Air Conditioner 3 suspension condition" is met, first determine whether there is a "sudden drop in return air temperature" based on whether there are related areas, and then proceed with the shutdown control of Air Conditioner 3 and post-shutdown control of Air Conditioner 3. If the "Air Conditioner 3 suspension condition" is not met, determine whether "Air Conditioner 3 is operating inefficiently". If it is not operating inefficiently, first adjust the operating parameters of Air Conditioner 3 according to the relatively high temperature or relatively low temperature environment, and then select and execute sub-processes such as C15, C19, and C25 according to the time parameters. If it is operating inefficiently, proceed with the shutdown control of Air Conditioner 3 and post-shutdown control of Air Conditioner 3.

[0206] Sub-process C25 involves specific steps C20, C21, C24, C11, C15, C17, C26, and D02. Its core is the control of air conditioning 3's suspension and inefficient operation. It also includes related time control, return air temperature drop control, air conditioning 3 shutdown control, and air conditioning 3 shutdown post-shutdown control: Every 3t2, real-time grain conditions are obtained to determine whether the "air conditioning 3 suspension condition" is met. If the "air conditioning 3 suspension condition" is met, it is first determined whether there is a "drop in return air temperature" based on whether there are related areas, and then the air conditioning 3 shutdown control and air conditioning 3 shutdown post-shutdown control are performed. If the "air conditioning 3 suspension condition" is not met, it is determined whether "air conditioning 3 is operating inefficiently". If it is not operating inefficiently, the air conditioning 3 operating parameters are first adjusted according to the relatively high temperature environment or the relatively low temperature environment, and then sub-process C15 or C19 is executed according to the time parameter. If it is operating inefficiently, the air conditioning 3 shutdown control and air conditioning 3 shutdown post-shutdown control are performed.

[0207] Subprocess C19, its core is the control of the "surface cooling task", the control of the suspension of air conditioner 3 and the control of the inefficient operation of air conditioner 3, and also includes related time control, control of sudden drop in return air temperature, control of air conditioner 3 shutdown and control after air conditioner 3 shutdown.

[0208] Subprocess C15 involves specific steps C16, C17, and C18. Its core is the control of air conditioner 3 operating beyond the time limit, and also includes related time control, control of air conditioner 3 shutdown, and control of air conditioner 3 after shutdown.

[0209] Example 4

[0210] like Figure 6 As shown, the green grain storage method using localized micro-wind circulation within the airbag to control the temperature of the upper grain layer, step C, is as follows:

[0211] C01: Based on the mathematical model for starting the air conditioner 3, determine whether the "condition for starting the air conditioner 3" is met. If not, execute C02; if so, execute C04.

[0212] C02: Execute C03 after interval t2;

[0213] C03: After obtaining the operating status, return air temperature and supply air temperature of air conditioner 3, execute C01;

[0214] C04: Determine whether air conditioner 3 is faulty based on fault and maintenance records. If it is faulty, proceed to C05; otherwise, proceed to C06.

[0215] C05: Execute C02 after triggering an alarm;

[0216] C06: Based on the closing limit sensor and opening limit sensor of the electric valve, determine whether the electric valve has an opening fault. If there is a fault, execute C05; otherwise, execute C07.

[0217] C07: Further determine whether the area has any related areas. If there are related areas, execute the sub-process "Related Area Management Process D01"; otherwise, execute C08.

[0218] C08: After starting the sub-process "C08 Air Conditioner 3 Startup Control Logic Flow", execute C09;

[0219] C09: Further determine whether the power supply to air conditioner 3 is successful. If it is unsuccessful, return to C02; if it is successful, execute C10.

[0220] C10: Set the fine-tuning value to 0 and then execute C11;

[0221] C11: Starts the sub-process "C11 Parameter Setting Process";

[0222] C12: Executes C12 after starting the sub-process "C11 Parameter Setting Process";

[0223] C12: Instructs Air Conditioner 3 to start. After Air Conditioner 3 starts its compressor, evaporator, condenser and other equipment under the control of the PLC program and enters the working state, execute C13.

[0224] C13: Obtain the operating status of air conditioner 3, return air temperature of air conditioner 3, supply air temperature of air conditioner 3, target return air temperature, start / stop temperature difference of air conditioner 3, and electricity consumption of smart meter.

[0225] C14: After setting T=0 to start timing, execute time control and proceed to step D;

[0226] The D01 associated area management adopts the principle of prioritizing the activation of air conditioner 3 in areas with high average surface grain temperature, no electric valve malfunction, no air conditioner 3 malfunction, and no sudden drop in return air temperature, in order to prevent local excessive cooling and local high temperature from affecting the temperature control effect.

[0227] The C11 parameter setting is used to set the operating parameters of the air conditioner 3 according to whether the air conditioner 3 is operating in a relatively high temperature environment or a relatively low temperature environment.

[0228] Example 5

[0229] like Figure 6 As shown, the green grain storage method using localized micro-wind circulation within the airbag to control the temperature of the upper grain layer, sub-process C30 specifically includes the following steps:

[0230] C30: Execute C03 if T=N*t1 is satisfied; otherwise, execute one of the subprocesses C15, C19, C25, C27, or C29.

[0231] C03: After acquiring and recording the operating status of air conditioner 3, return air temperature of air conditioner 3, supply air temperature of air conditioner 3, etc., execute C31;

[0232] C31: Determine whether air conditioner 3 is operating normally. If it is operating normally, execute sub-process C15; if it is in standby mode, execute C32.

[0233] C32: Determine if air conditioner 3 is in normal standby mode. If it is in normal standby mode, execute step C16; otherwise, execute C33.

[0234] C16: After acquiring and recording real-time grain condition data, return air target temperature, air conditioning start / stop temperature difference, and smart meter electricity consumption, sub-processes C17 and C18 are executed successively.

[0235] C33: After diagnosing air conditioner fault 3, proceed with C34;

[0236] C34: After recording the air conditioner fault diagnosis results in the "Fault / Repair Record Form", proceed to step C16.

[0237] Example 6

[0238] like Figure 6 As shown, the green grain storage method, which uses localized micro-wind circulation within the airbag to control the temperature of the upper grain layer, includes the following steps in sub-process C29:

[0239] C29: If T=N*t2 is satisfied, execute C24; otherwise, execute one of the sub-processes C15, C19, C25, C27, or C30.

[0240] C24: Acquire and record the operating status of air conditioner 3, return air temperature of air conditioner 3, supply air temperature of air conditioner 3, target return air temperature, start / stop temperature difference of air conditioner 3, electricity consumption of smart meter, etc., and then proceed to step C20.

[0241] C20: Determine whether air conditioner 3 meets the "air conditioner 3 pause condition". If not, execute sub-process C15; if so, execute sub-process D02.

[0242] Example 7

[0243] like Figure 6 As shown, the green grain storage method, which uses localized micro-wind circulation within the airbag to control the temperature of the upper grain layer, includes the following steps in sub-process C27:

[0244] C27: Execute C16 if T=N*2t2 is satisfied; otherwise, execute one of the subprocesses C15, C19, C25, C29, or C30.

[0245] C16: Acquire and record real-time grain condition data, air conditioner 3 operating status, air conditioner 3 return air temperature, air conditioner 3 supply air temperature, return air target temperature, air conditioner 3 start / stop temperature difference, smart meter electricity consumption, etc., and then proceed to step B06.

[0246] B06: Determine whether the "surface cooling task pause condition" for this area is met. If it is met, proceed to step B07; otherwise, proceed to step C20.

[0247] B07: After suspending the "surface cooling task" in this area, execute the air conditioner 3 shutdown control logic flow C17 and the air conditioner 3 shutdown management flow C18 in sequence.

[0248] C20: Determine whether the "Air Conditioner 3 Pause Condition" is met. If it is met, execute sub-process D02; otherwise, execute step C21.

[0249] C21: Determine if the air supply temperature of air conditioner 3 is operating inefficiently. If air conditioner 3 is operating inefficiently, execute sub-processes C17 and C18 in sequence. If air conditioner 3 is operating normally, execute step C28.

[0250] C28: After setting the fine-tuning value to 0, execute subprocess C11. After obtaining and recording the parameters through C16, run subprocess C15.

[0251] Example 8

[0252] like Figure 6 As shown, the green grain storage method using localized micro-wind circulation within the airbag to control the temperature of the upper grain layer includes the following steps in sub-process C25:

[0253] C25: Execute C24 if T=N*3t2 is satisfied; otherwise, execute one of the subprocesses C15, C19, C27, C29, or C30.

[0254] C24: Acquire and record the operating status of air conditioner 3, return air temperature of air conditioner 3, supply air temperature of air conditioner 3, target return air temperature, start / stop temperature difference of air conditioner 3, electricity consumption of smart meter, etc., and then proceed to step C20.

[0255] C20: Determine whether the "Air Conditioner 3 Pause Condition" is met. If it is met, execute sub-process D02; otherwise, execute step C21.

[0256] C21: Determine if the air supply temperature of air conditioner 3 is operating inefficiently. If air conditioner 3 is operating inefficiently, execute sub-processes C17 and C18 in sequence. If air conditioner 3 is operating normally, execute step C26.

[0257] C26: After setting the fine-tuning value to 0, execute sub-process C11, retrieve and record the parameters again, and then run sub-process C15.

[0258] Example 9

[0259] like Figure 6 As shown, the green grain storage method, which uses localized micro-wind circulation within the airbag to control the temperature of the upper grain layer, includes the following steps in sub-process C19:

[0260] C19: If T=N*6t2 is satisfied, execute step C16; if T=N*6t2 is not satisfied, execute one of the sub-processes C15, C25, C27, C29, or C30.

[0261] C16: Acquire and record real-time grain conditions, air conditioner 3 operating status, air conditioner 3 return air temperature, air conditioner 3 supply air temperature, return air target temperature, air conditioner 3 start / stop temperature difference, smart meter electricity consumption, etc., and then proceed to step B06.

[0262] B06: Determine whether the "surface cooling task pause condition" for this area is met. If it is met, proceed to step B07; otherwise, proceed to step C20.

[0263] B07: After pausing the "surface cooling task" in this area, sub-processes C17 and C18 will be executed successively.

[0264] C20: Determine whether the "Air Conditioner 3 Pause Condition" is met. If it is met, execute sub-process D02; otherwise, execute step C21.

[0265] C21: Determine if the air supply temperature of air conditioner 3 is operating inefficiently. If air conditioner 3 is operating inefficiently, execute sub-processes C17 and C18 in sequence. If air conditioner 3 is operating normally, execute step C22.

[0266] C22: Determine whether the condition "average grain temperature in the area - supply air temperature ≥ supply air temperature difference" is met. If it is met, proceed to step C23; otherwise, proceed to step C24.

[0267] C23: After setting the fine-tuning value to 0, run parameter setting procedure C11;

[0268] C24: After setting the fine-tuning value to the software setting value, run parameter setting process C11, where the software setting value is adjusted manually according to the actual situation;

[0269] C11: Reset the operating parameters of air conditioner 3, obtain and record the parameters, and then execute sub-process C15.

[0270] Example 10

[0271] like Figure 6 As shown, the green grain storage method, which uses localized micro-wind circulation within the airbag to control the temperature of the upper grain layer, includes the following steps in sub-process C15:

[0272] C15: If T=N*t3 is satisfied, execute step C16; otherwise, execute one of the subprocesses C19, C25, C27, C29, or C30.

[0273] C16: Acquire and record real-time grain conditions, air conditioner 3 operating status, air conditioner 3 return air temperature, air conditioner 3 supply air temperature, return air target temperature, air conditioner 3 start / stop temperature difference, smart meter electricity consumption, etc., and then proceed to step C17.

[0274] C17: Execute sub-process C18 after executing sub-process C17.

[0275] Example 11

[0276] In specific implementation, this invention analyzes whether a sudden drop in return air temperature has occurred in the associated area using a return air temperature drop analysis model at set time intervals.

[0277] Regional joint control principle: Air conditioner 3 is activated in rotation in areas with high average surface grain temperature, areas without faults (meaning no fault in the electric valve and no fault in air conditioner 3), and areas where there has been no sudden drop in return air temperature, in order to prevent local excessive cooling and local high temperature from affecting the temperature control effect.

[0278] The control system is based on the record of sudden drop in return air temperature in the associated area within 6 hours. This prevents insufficient operation of air conditioner 3 for an extended period from affecting the achievement of the cooling target. If there is no record of sudden drop in return air temperature within 6 hours, air conditioner 3 can operate simultaneously.

[0279] like Figure 7 As shown, the joint control management process for area D01 is as follows:

[0280] D01-01: Determine whether there is a record of a sudden drop in return air temperature in this area or related areas within 6 hours. If there is no record of a sudden drop, proceed to C08; otherwise, proceed to step D01-02.

[0281] D01-02: Determine whether the return air temperature has dropped sharply in both the area and the associated area. If the condition is not met, execute sub-process D01-08; otherwise, execute step D01-03.

[0282] D01-03: Determine whether the area is a priority cooling area. If it is, proceed to step D01-04; otherwise, proceed to step D01-06.

[0283] D01-04: Determine if the electric valve in this area has an opening fault. If the condition is met, proceed to step C05; otherwise, proceed to step D01-05.

[0284] D01-05: Determine if air conditioner 3 in this area is faulty. If the condition is met, execute step C05; otherwise, execute sub-process C08.

[0285] D01-06: Determine if the electric valve in the associated area has an opening fault. If it meets the requirement, proceed to step D01-04; otherwise, proceed to step D01-07.

[0286] D01-07: Determine if there is a fault in the associated area air conditioner 3. If the fault is met, proceed to step D01-04; otherwise, proceed to step C05.

[0287] D01-08: Determine whether a sudden drop in return air temperature has occurred in the area. If the condition is met, proceed to step D01-06; otherwise, proceed to step D01-04.

[0288] Example 12

[0289] In specific implementations of this invention, such as Figure 8 As shown, the sub-process "D02 Return Air Temperature Drop Management Process" is as follows:

[0290] D02-01: Determine whether the condition "this area has related areas" is met. If there are related areas, execute step D02-02; otherwise, execute sub-process C17.

[0291] D02-02: Determine whether the "sudden drop in return air temperature" condition is met. If it is met, execute step D02-03; otherwise, execute sub-process C17.

[0292] D02-03: Execute subprocess C17 after the return air temperature drops sharply in the "Record Run" log.

[0293] Example 13

[0294] In specific implementations of this invention, such as Figure 9As shown, the sub-process "Parameter Setting Process C11" specifically includes:

[0295] C11-01: Based on the high temperature / low temperature period settings in the system, determine whether the condition "currently in a low temperature period" is met. If it is met, proceed to step C11-02; otherwise, proceed to step C11-03.

[0296] C11-02: After setting "Return air target temperature 1 = surface average grain temperature control target - 2 * control temperature difference", proceed to step C11-05;

[0297] C11-03: Using the temperature drop analysis model, determine whether the condition "current temperature drops sharply" is met. If it is met, proceed to step C11-02; otherwise, proceed to step C11-04.

[0298] C11-04: After setting "Return air target temperature 1 = surface average grain temperature control target - control temperature difference", proceed to step C11-05;

[0299] C11-05: After setting "Return air target temperature 2 = Return air target temperature 1 - Fine adjustment value", proceed to step C11-06;

[0300] C11-06: Determine whether the condition "the return air target temperature 2 is greater than the minimum setting value" is met. If it is met, proceed to step C11-07. If it is not met, proceed to step C11-08.

[0301] C11-07: After setting "Return air target temperature = Return air target temperature 2", execute C11-09;

[0302] C11-08: Set "Return air target temperature = minimum setting value" and then execute C11-09;

[0303] C11-09: After reading the air conditioner start / stop temperature difference set in the system, execute step C11-10. The air conditioner start / stop temperature difference is adjusted manually according to the instruction manual and specific circumstances.

[0304] C11-10: System communication with the air conditioner 3 PLC board to set air conditioner 3 operating parameters: return air target temperature, air conditioner 3 start / stop temperature difference.

[0305] Example 14

[0306] In specific implementations of this invention, such as Figure 10 As shown, the sub-process "Air Conditioner 3 Start-up Control Logic Flow C08" specifically includes:

[0307] C08-01: After the start-up conditions of air conditioner 3 are met, open the corresponding return air electric valve and supply air electric valve of air conditioner 3;

[0308] C08-02: Obtain the real-time operating status of the electric valve;

[0309] C08-03: Determine if the return air electric valve is fully closed;

[0310] If the air conditioner is closed and remains closed even after multiple attempts to open it, the internal circulation airflow loop of the air conditioner is not smooth. Then, execute C08-04 to record the fault of the return air electric valve, further execute C08-05 to close the return air electric valve and the supply air electric valve, and trigger the C08-06 fault alarm. After that, return to the main process C02.

[0311] If it is not closed properly, proceed to step C08-07 to determine whether the return air electric valve is fully open;

[0312] If C08-07 is in the open position, then further execute C08-10 to obtain the real-time status of the air supply electric valve;

[0313] If C08-07 is not fully open, record C08-08 as not fully open, trigger fault alarm C08-09, and further execute C08-10;

[0314] C08-11: Determine whether the air supply electric valve is closed. If it is closed, execute C08-12 to record the air supply electric valve opening fault, and then execute C08-05.

[0315] If C08-11 indicates that the valve is not fully closed, then execute C08-13 to further determine whether the air supply electric valve is fully open. If it is not fully open, execute C08-19 to record that the air supply electric valve is not fully open, and execute C08-20 for fault alarm. Then execute C08-14.

[0316] If C08-13 is in the "open" position, then execute C08-14 to power on air conditioner 3;

[0317] C08-15: Obtain the power supply status of air conditioner 3;

[0318] C08-16: Determine whether air conditioner 3 is successfully powered. If the power supply is successful, return to the main process C09.

[0319] If the power supply fails, execute C08-17 to cut off the power to air conditioner 3, and then execute C08-18 to record the power supply failure of air conditioner 3.

[0320] The core idea behind the air conditioner's 3-start control logic flow is:

[0321] If either the return air electric valve or the supply air electric valve fails to open to the correct position, and multiple attempts to open it still fail to do so (fault tolerance), the internal circulation airflow loop of the air conditioner 3 is obstructed. Close the return air electric valve and the supply air electric valve, trigger a fault alarm, and record the electric valve opening fault (fault / maintenance record form).

[0322] With both the return air electric valve and the supply air electric valve fully open, the internal circulation airflow loop of air conditioner 3 is unobstructed, and the monitoring and control terminal corresponding to the software command powers air conditioner 3 and obtains the power supply status of air conditioner 3.

[0323] Air conditioner 3 failed to supply power, and failed to supply power multiple times (fault tolerance). Power off air conditioner 3, close the return air electric valve and the supply air electric valve and set up a fault alarm. Record the power supply failure of air conditioner 3 (fault / maintenance record form).

[0324] Air conditioner 3 is successfully powered. Return to the main process to set operating parameters and commands to start air conditioner 3.

[0325] Power should be supplied and the air conditioner 3 should be started only after the internal air circulation loop of the air conditioner 3 is clear, in order to avoid damage to the air conditioner 3.

[0326] Example 15

[0327] In specific implementations of this invention, such as Figure 11 As shown, the sub-process "Air Conditioner 3 Shutdown Control Logic Flow C17" specifically includes:

[0328] C17-01: After the conditions for air conditioner 3 to stop are met, the system command corresponding to the monitoring and control terminal will cut off the power to air conditioner 3;

[0329] C17-02: Confirmed that air conditioner 3 is out of service;

[0330] C17-03: Close the return air electric valve and supply air electric valve of the corresponding air conditioner 3;

[0331] C17-04: Obtain the real-time status of the return air electric valve;

[0332] C17-05: Determine if the return air electric valve is fully closed;

[0333] If the valve is not fully closed, execute C17-06 to record the return air electric valve closure fault; if it still fails to close fully after multiple attempts, execute C17-07 to trigger a fault alarm; then execute C17-08 to obtain the real-time status of the supply air electric valve.

[0334] If the door is closed properly, proceed directly to C17-08;

[0335] C17-08: Obtain the real-time status of the air supply electric valve, and then further execute C17-09 to determine the status of the electric valve;

[0336] C17-09: Determine if the air supply electric valve is fully closed;

[0337] If the valve is not fully closed, execute C17-10 to record the fault in the air supply electric valve; if it is still not fully closed after multiple attempts to close, further execute C17-11 to trigger a fault alarm and return to the main process C18.

[0338] If the switch is closed correctly, return directly to the main process C18.

[0339] During the cooling process, the software determines at intervals t2 whether air conditioner 3 should be shut down.

[0340] Example 16

[0341] In specific implementations of this invention, such as Figure 12 As shown, the post-shutdown control process for sub-process C18 specifically includes:

[0342] C18-01: Record the real-time grain condition data, air conditioner 3 operating status, air conditioner 3 return air temperature, air conditioner 3 supply air temperature, return air target temperature, air conditioner 3 start / stop temperature difference and smart meter electricity consumption at the time of shutdown according to the "Operation Record Sheet".

[0343] C18-02: Automatically analyzes the phased cooling effect from the start to the shutdown of air conditioner 3 according to the "Regional Cooling Effect Analysis"; automatically plots regional index change curves; allows querying of regional cooling effect and index change curves within the start and end time period; and allows comparison of cooling effects in different areas of the same facility.

[0344] C18-03: Automatically analyzes the cooling effect of the year according to the "Garment Cooling Effect Analysis"; automatically plots the change curve of the gear room index; allows querying the cooling effect and index change curve of the gear room within the start and end time period; and allows comparison of the cooling effect of different gear rooms.

[0345] C18-03 determines that air conditioner 3 is operating inefficiently and has stopped. Execute C18-04: pause time t5, and return to the main process C02.

[0346] C18-03 determines that: Air conditioner 3 has exceeded the maximum time limit (continuous operation t3) and has stopped. Execute C18-05: Pause time t4, return to main process C02;

[0347] C18-03 indicates: Pause the surface cooling task and return to the main process B01;

[0348] C18-03 determines that the air conditioner meets the 3rd pause condition and stops, then returns to the main process C02;

[0349] The system was determined by C18-03 to be in abnormal standby mode and stopped. The process was then returned to the main procedure C02.

[0350] Experimental Example 1

[0351] Take the actual usage of a grain warehouse in Guiyang as an example.

[0352] Temperature control effect:

[0353] In April 2021, experimental warehouse No. 3 used local micro-wind circulation precise temperature control technology in the heat-insulating airbag. By June 30, 2021, the surface grain temperature was 16.8℃ (consistently controlled below the target of 17℃). During the same period, the surface grain temperature of control warehouse No. 17 was 22.9℃ on June 30, 2021, which was 6.1℃ lower than that of the control warehouse.

[0354] Cooling effect:

[0355] In August 2021, after the grain was stored in Warehouse No. 15 of a grain depot in Guiyang, precise temperature control technology with localized micro-wind circulation within insulated airbags was implemented on September 2nd. By September 15th, the warehouse temperature had decreased by 2.5℃, and the surface grain temperature had decreased by 5.52℃ (from 25.25℃ to 19.73℃). The surface grain temperature in Warehouse No. 15 before and after the implementation is shown in Table 1 below. On September 15th, the average surface grain temperature in Warehouse No. 15 was 19.73℃, which was 6.07℃ lower than the warehouse temperature, a significant difference.

[0356] Meanwhile, in the control warehouse #9, the surface grain temperature fluctuated between -0.3 and 1.2℃, with an average increase of 0.12℃, while the warehouse temperature increased by 0.3℃. On September 15th, the surface grain temperature in control warehouse #9 was 25.4℃, and the warehouse temperature was 26.6℃, showing little difference and rising synchronously. This example illustrates that, due to the effect of the insulating airbags, the warehouse temperature was much higher than the surface grain temperature. The precise temperature control technology using localized micro-wind circulation within the insulating airbags achieved the control requirement of primarily controlling the surface grain temperature and secondarily controlling the warehouse temperature, while also reducing the energy consumption of low-temperature grain storage.

[0357] Table 1. Comparison of surface grain temperature in warehouse #15 before and after the operation of the grain pile temperature regulation system.

[0358]

[0359] Insect repellency:

[0360] The following year, the insect population density in warehouses #15 and #3 of the Gui'an branch of the China Grain Reserves Corporation (Sinograin) Guiyang branch did not exceed the general insect-infested grain levels, and therefore no fumigation was carried out. Meanwhile, the control warehouses #9 and #17 were fumigated in May of the following year.

[0361] Energy consumption:

[0362] By limiting the cold source of the air conditioner 3 to the pores between grains in the grain surface film insulation airbag, the surface grain temperature can be precisely controlled. The control of surface grain temperature is the primary function, while the control of warehouse temperature is secondary. This reduces the number of air conditioners 3 required and their energy consumption.

[0363] This application solves the problems of large, flat-roofed warehouses without horizontal roofs, large storage space, difficulty in installing ceilings for thermal insulation, and the large number and high energy consumption of air conditioning units (3-type temperature control systems). It precisely directs limited cold air sources to the most critical areas requiring cooling, achieving high energy efficiency. The key area for grain temperature control in this application is the grain surface, because over 70% of the heat transferred from the external environment to the warehouse originates from the roof. A standard flat-roofed warehouse has a height of 2 meters; while flat-roofed warehouses with zigzag roof trusses or other flat-roofed warehouses without horizontal roofs can reach an average height of 3-3.5 meters. Through the air conditioning unit's supply and return air duct network, the cold air from the air conditioning unit (3-type) is precisely directed to the grain surface, rather than the entire warehouse space.

[0364] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A green grain storage system that uses localized micro-wind circulation within airbags to control the temperature of upper-layer grain, characterized in that: Includes control system, local micro-air circulation duct network, grain warehouse dedicated air conditioner, monitoring and control terminal, and heat preservation airbag; The heat-insulating airbag is a thin film structure that is connected to the warehouse wall, separating the grain warehouse into two spaces: the warehouse room and the grain pile. The dedicated air conditioner for grain storage is installed outside the storage area and connected to the local micro-air circulation network through the external air supply main and the external air return main. The area of ​​grain surface covered by the cold air from a single dedicated air conditioner is an independent temperature control zone, and the surface grain temperature is controlled by zone. The air supply main is equipped with an electric valve, and the air return main is equipped with an electric valve. Both the electric valve and the electric valve are equipped with relevant limit sensors and open limit sensors. The local micro-air circulation network is installed under the heat-insulating airbag, and the layout of the local micro-air circulation network is determined according to the width of the grain silo. The measurement and control terminal is connected to the control system. The measurement and control terminal includes: an LCD display control screen, an LCD screen communication module, a network communication module, a wireless communication module, an EMC protection module, a 485 communication module, a MODBUS module, a temperature and humidity module, a central processing unit, a current management module, and a safety protection module. The power supply of the grain depot-specific air conditioner is connected to a relay via an AC contactor, and the relay is connected to a power management module. The temperature and humidity module is connected to a grain condition detection module, which includes a grain pile temperature and humidity cable, a grain pile temperature measuring cable, and a warehouse temperature and humidity sensor installed in the grain pile, as well as a temperature and humidity sensor installed outside the grain warehouse; the data collected by the grain condition detection module enables the automatic control of the grain warehouse's dedicated air conditioner. The control system integrates mathematical control models for analysis and decision-making, as well as logical control processes, enabling the system to make intelligent decisions to regulate the surface grain temperature, while also having protection mechanisms to ensure safe operation of the equipment and fault tolerance mechanisms for equipment failures.

2. The green grain storage system for controlling the temperature of upper grain layers through localized micro-wind circulation within the airbag according to claim 1, characterized in that, When the width of the grain warehouse is no more than 16 meters, the local micro-air circulation network includes supply air branch pipes and return air branch pipes. The supply air branch pipes are connected to the main supply air pipe outside the warehouse, and the return air branch pipes are connected to the main return air pipe outside the warehouse. The supply air branch pipes and return air branch pipes are both horizontally arranged along the warehouse wall and are arranged on opposite warehouse walls.

3. The green grain storage system for controlling the temperature of upper grain layers through localized micro-wind circulation within the airbag according to claim 1, characterized in that, When the width of the grain silo is greater than 16 meters, the local micro-air circulation network includes supply air branch pipes and return air branch pipes. The supply air branch pipes are connected to the main supply air pipe outside the silo, and the return air branch pipes are connected to the main return air pipe outside the silo. The return air branch pipes are respectively installed on opposite silo walls, and the supply air branch pipes are installed in the middle of the grain silo parallel to the return air branch pipes. When the width of the grain warehouse is greater than 16 meters, the two areas sharing the air supply branch pipe are considered as related areas.

4. A green grain storage method that uses localized micro-wind circulation within an airbag to control the temperature of the upper grain layer, characterized in that... Includes the following steps: Step A: In the preparation stage, the external air circulation inside and outside the granary is cut off, forming an internal circulation working environment required to regulate the surface grain temperature within the heat-insulating airbag using local micro-wind circulation of air conditioning; adopting a zoned control method, the grain surface covered by the cold air of a single grain warehouse air conditioner is taken as an independent temperature control zone, and the grain surface in the granary is physically divided into multiple areas. Step A specifically includes the following steps: A01: Deployment of airbags, control system, and local micro-air circulation network; A02: Close the ventilation facilities inside and outside the original grain warehouse; A03: Within a defined area, establish a local micro-wind circulation temperature control system and establish a one-to-one correspondence between the area, the booster air conditioner, the return air electric valve, and the supply air electric valve. Step B: Collect grain condition data and air conditioning operation status in each area through hardware devices to determine whether the conditions for starting the surface cooling task in that area are met; Step B specifically includes the following steps: B02: Acquire and record data, including but not limited to: real-time grain condition data, air conditioning operating status, air conditioning return air temperature, and air conditioning supply air temperature; B03: Analyze whether the current environment is relatively high or relatively low, and combine the mathematical control model for starting / stopping the task of reducing surface grain temperature to determine whether the conditions for starting the task of reducing surface grain temperature are met. If the condition is met, proceed to step C; otherwise, proceed to step B04. B04: Execute the inner loop of step B: acquire real-time data at interval 2t2 and run step B03; Step C: Perform air conditioner start-up control and operation parameter settings; Step C includes: C01: Based on the air conditioner startup mathematical model, determine whether the air conditioner startup conditions are met. If not, execute C02; otherwise, execute C04. C02: Execute C03 after interval t2; C03: After obtaining the air conditioner's operating status, return air temperature, and supply air temperature, execute C01; C04: Determine if the air conditioner is faulty based on fault and maintenance records. If there is a fault, proceed to C05; otherwise, proceed to C06. C05: Execute C02 after triggering an alarm; C06: Based on the closing limit sensor and opening limit sensor of the electric valve, determine whether the electric valve has an opening fault. If there is a fault, execute C05; otherwise, execute C07. C07: Further determine whether the area has any related areas. If there are related areas, execute sub-process D01 Related Area Management Process; otherwise, execute C08. C08: Start sub-process C08 air conditioner start control logic process, then execute C09; C09: Further determine whether the air conditioner is powered on successfully. If unsuccessful, return to C02; if successful, execute C10. C10: Set the fine-tuning value to 0 and then execute C11; C11: After starting the C11 subprocess parameter setting process, execute C12; C12: Instruction to start the air conditioner. After the air conditioner starts working under the control of the PLC program, the compressor, evaporator, condenser and other equipment enter the working state, execute C13; C13: After obtaining the air conditioner operating status, air conditioner return air temperature, air conditioner supply air temperature, return air target temperature, air conditioner start / stop temperature difference, and smart meter electricity consumption, execute C14. C14: After setting T=0 to start timing, execute time control and proceed to step D; The D01 associated area management adopts the principle of prioritizing the activation of air conditioning in areas with high average surface grain temperature, no electric valve malfunctions, no air conditioning malfunctions, and no sudden drop in return air temperature, in order to prevent localized excessive cooling and localized high temperatures from affecting the temperature control effect. The C11 parameter setting is configured according to whether the air conditioner is operating in a relatively high temperature environment or a relatively low temperature environment. Specifically, in low-temperature environments, a lower return air target temperature is set to increase the air conditioning operating time; in high-temperature environments, a higher return air target temperature is set to shorten the air conditioning operating time; while ensuring the overall target temperature, the time the air conditioner operates in a high-energy-consumption state is shortened, thus saving air conditioning energy consumption. Step D: Run the equipment in a multi-threaded parallel manner in different rooms and areas, and regulate the cooling process in the area by time control and event control; Step D includes six sub-processes: C15, C19, C25, C27, C29, and C30. The specific time parameter settings involved in time control in step D are as follows: t1: Air conditioner fault diagnosis interval, reference value 1 minute; t2: Grain condition detection interval, reference value 5 minutes; t3: The longest continuous operating time for the air conditioner, with a reference value of 360 minutes; t4: Duration of pause during normal air conditioning operation, reference value 15 minutes; t5: Duration of pause due to inefficient air conditioning operation, reference value 150 minutes; 2t2: Interval time for surface cooling task control; 3t2: Interval time for judging abnormal supply air temperature; 6t2: Time for judging air supply temperature difference adjustment; The time control is specifically as follows: when T=t3, C15 is executed; when T=N*6t2, C19 is executed; when T=N*3t2, C25 is executed; when T=N*2t2, C27 is executed; when T=N*t2, C29 is executed; and when T=N*t1, C30 is executed, so that the system executes different processes in different time periods, and each process is responsible for executing different event control. The event management includes: time management, equipment failure management, operating environment analysis, air conditioning operating parameter settings, air conditioning inefficient operation analysis, air conditioning standby management, and air conditioning shutdown management.

5. The green grain storage method for controlling the temperature of the upper grain layer by local micro-wind circulation within the airbag according to claim 4, characterized in that, Step C: Perform air conditioner start-up control and operation parameter setting, including the following: determining whether the air conditioner start-up conditions are met, equipment fault control, determining whether there are related areas in the temperature control zone, starting the air conditioner and setting the air conditioner operation parameters.

6. The green grain storage method for controlling the temperature of the upper grain layer by local micro-wind circulation within the airbag according to claim 5, characterized in that, The sub-process C30 includes air conditioner standby management, as well as time management, air conditioner fault management, air conditioner shutdown management and air conditioner shutdown post-shutdown management related to air conditioner standby management; Every interval t1, the real-time operating parameters of the air conditioner are obtained to determine whether the air conditioner is operating normally. If running normally, select to execute subprocess C15, C19, C25, C27 or C29 according to the time parameter; If abnormal operation occurs, check whether the air conditioner's standby status is normal, and manage the air conditioner's faults, shutdown, and post-shutdown based on the standby status. The sub-process C29 includes air conditioning pause control and return air temperature drop control, as well as related time control, air conditioning shutdown control and air conditioning shutdown post-shutdown control; Every t2, real-time grain conditions are obtained to determine whether the conditions for suspending air conditioning are met. If the conditions are not met, sub-processes such as C15, C19, C25, and C27 will be executed according to the time parameters. If there are related areas, it is necessary to determine whether the return air temperature has dropped sharply. If the conditions are met, it is necessary to perform shutdown air conditioning control and post-shutdown air conditioning control. The sub-process C27 is for the management and control of surface cooling tasks, air conditioning suspension and inefficient air conditioning operation, as well as related time management, return air temperature drop management, air conditioning shutdown management and post-shutdown management. Every 2t2, real-time grain conditions are obtained to determine whether the surface grain temperature cooling task has been completed. If the condition is met, then the air conditioning shutdown control and post-shutdown control will be implemented; if the condition is not met, then it will be determined whether the air conditioning shutdown conditions are met; if the air conditioning shutdown conditions are met, first determine whether the return air temperature drops suddenly based on whether there are related areas, and then the air conditioning shutdown control and post-shutdown control will be implemented. If the conditions for suspending the air conditioner are not met, determine whether the air conditioner is operating inefficiently. If it is not operating inefficiently, first adjust the air conditioner operating parameters according to the relatively high or low temperature environment, and then select and execute sub-processes such as C15, C19, and C25 according to the time parameters. If it is operating inefficiently, then perform air conditioner shutdown management and air conditioner shutdown post-shutdown management. The sub-process C25 includes air conditioning suspension control and air conditioning inefficient operation control, as well as related time control, return air temperature drop control, air conditioning shutdown control and air conditioning shutdown post-shutdown control; Every 3t2, real-time grain conditions are obtained to determine whether the conditions for suspending air conditioning are met; If the conditions for suspending the air conditioning are met, first determine whether there is a sudden drop in return air temperature based on whether there are related areas, and then implement the control of air conditioning shutdown and post-shutdown management; if the conditions for suspending the air conditioning are not met, determine whether the air conditioning is operating inefficiently. If not operating inefficiently, first adjust the air conditioning operating parameters according to the relatively high or low temperature environment, and then select to execute sub-process C15 or C19 according to the time parameter; if operating inefficiently, then perform air conditioning shutdown control and air conditioning shutdown post-shutdown control. The sub-process C19 includes control over surface cooling tasks, control over air conditioning suspension and control over inefficient air conditioning operation, as well as related time control, control over sudden drop in return air temperature, control over air conditioning shutdown and control after air conditioning shutdown. Subprocess C15 is for the management and control of air conditioner operation exceeding time limits, as well as related time management, air conditioner shutdown management and air conditioner shutdown post-shutdown management.

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