An intelligent ventilation regulation system for grain storage based on airflow field dynamic reconstruction

Abstract

The application discloses a kind of grain storehouse intelligent ventilation regulation and control systems based on airflow field dynamic reconstruction, specifically related to grain storehouse control field, including airflow field partition modeling module, airflow state dynamic identification module, airflow field dynamic reconstruction decision module, partition execution control module and feedback correction and operation record module.System is through the collection partition wind pressure, partition wind speed, partition temperature and humidity and airflow boundary data, identifies airflow drift area, ventilation stagnation area and local backflow area, and generates air inlet path, exhaust path, partition air volume and the linkage control instruction of deflector posture, drives variable frequency fan, partition air inlet valve, partition air outlet valve and deflector to execute airflow field reconstruction.After reconstruction, system again collects airflow state and corrects control parameter, so that grain storehouse ventilation path can continue to adjust with grain pile state change.

Description

Technical Field

[0001] This invention relates to the field of grain warehouse control technology, and more specifically, to an intelligent ventilation control system for grain warehouses based on dynamic reconfiguration of airflow field. Background Technology

[0002] Existing grain silo ventilation systems typically use outside air temperature and humidity, as well as the temperature and humidity of the grain pile inside the silo, as criteria for ventilation control. Ventilation start and stop conditions are set in the controller. During system operation, sensors first collect data on the external environment and measuring points on the grain pile. The controller compares the collected data with preset thresholds. When the outside air conditions meet the cooling or dehumidification requirements, the controller starts the fan, allowing outside air to enter the grain pile through inlets and ventilation troughs, and then exit through the grain surface or exhaust vents. When the temperature and humidity of the grain pile reach the set range, or when the outside air conditions no longer meet the ventilation requirements, the controller stops the fan. Some existing systems may add variable frequency fans, automatic valves, and remote monitoring devices to adjust the total airflow, record operating parameters, and enable remote start / stop.

[0003] The shortcomings of existing technologies lie in their control of primarily the average temperature and humidity of the entire storage area or a few measuring points, making it difficult to reflect the actual airflow path within the grain pile. Due to differences in grain loading height, impurity distribution, localized compaction, and the influence of storage wall boundaries, airflow deviation zones, stagnant ventilation zones, and localized backflow zones easily appear within the grain pile. Existing systems typically cannot identify these zones before adjusting the intake and exhaust paths, leading to concentrated airflow in some areas and chronically insufficient ventilation in others during fan operation. Furthermore, existing technologies tend to treat fan frequency adjustment and valve opening adjustment as isolated actions, lacking a continuous closed loop between zoned airflow state identification, path reconstruction decision-making, actuator linkage, and post-reconstruction feedback correction. Therefore, it is difficult to continuously correct the ventilation path after changes in the grain pile's condition. Summary of the Invention

[0004] To overcome the aforementioned deficiencies of the prior art, the present invention provides an intelligent ventilation control system for grain warehouses based on dynamic reconfiguration of airflow field, which solves the problems mentioned in the background art through the following solutions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an intelligent ventilation control system for grain warehouses based on dynamic reconstructing of airflow field, the system comprising an airflow field zoning modeling module, an airflow state dynamic identification module, an airflow field dynamic reconstructing decision module, a zoning execution control module, and a feedback correction and operation recording module; The airflow field zoning modeling module is used to generate airflow reconstruction zones based on the grain warehouse space parameters, grain pile resistance response parameters and ventilation boundary parameters, and to establish the correspondence between the airflow reconstruction zones and sensors, zone air inlet valves, zone air exhaust valves and guide vanes; The airflow state dynamic identification module is used to collect data on the changes in zone pressure difference, zone wind speed, and zone temperature and humidity according to the airflow reconstruction zone, and to identify the deflection zone, stagnant zone, and normal ventilation zone based on the data on the changes in zone pressure difference, zone wind speed, and zone temperature and humidity. The dynamic airflow reconstruction decision module is used to generate reconstruction control commands based on the deflection area, stagnation area and normal ventilation area. The reconstruction control commands include variable frequency fan frequency commands, zone air inlet valve opening commands, zone air exhaust valve opening commands and guide vane attitude commands. The zone execution control module is used to control the variable frequency fan, zone air inlet valve, zone air outlet valve and guide vane to perform linked actions according to the reconfiguration control command; The feedback correction and operation recording module is used to collect data on the changes in zone pressure difference, zone wind speed, and zone temperature and humidity after the linkage action, and corrects the reconstruction control commands of the airflow field dynamic reconstruction decision module based on the collected results.

[0006] The technical effects and advantages of this invention are as follows: This solution divides the grain silo interior into reconstructed airflow zones corresponding to sensors and actuators using an airflow field zoning modeling module. This allows the system to move beyond simply relying on the average temperature and humidity of the entire silo for ventilation decisions. The system can identify airflow deviation areas, stagnant ventilation areas, and normal ventilation areas based on zoned air pressure, wind speed, temperature, humidity, and airflow boundary data. This transforms the ventilation control target from a uniform state across the entire silo to a zoned airflow state, enabling a more accurate correspondence to the actual ventilation path within the grain pile. This solution uses a dynamic airflow field reconstruction decision module to convert airflow state identification results into coordinated control commands for inlet and outlet paths, zoned airflow, and guide vane attitude. For areas with airflow deviation, the system can reduce the corresponding inlet ratio and exhaust suction intensity; for areas with stagnant airflow, the system can increase the corresponding inlet ratio and adjust the exhaust path; for areas with localized backflow, the system can change the airflow direction by adjusting the guide vane attitude. This control method ensures that the fan, zoned inlet valves, zoned exhaust valves, and guide vanes coordinate their actions around the same airflow field reconstruction target, avoiding new localized airflow imbalances caused by independent adjustments of a single actuator. This solution uses a feedback correction and operation recording module to re-collect zone pressure difference, zone wind speed, and zone temperature and humidity after each reconfiguration command is executed, and to determine the deviation between the airflow state after execution and the reconfiguration target. The system can distinguish the source of deviation as either the execution component not being in place or the airflow path not reaching the target, and update the adjustment parameters in the next round of reconfiguration commands accordingly. In case of valve malfunction, fan pressure malfunction, or disconnection of critical sensors, the system can switch to a safe ventilation path. This closed-loop processing enables the grain silo to continuously correct the ventilation control process even after changes in grain pile resistance, changes in airflow path within the silo, and changes in the state of execution components. Attached Figure Description

[0007] Figure 1 This is the overall flowchart of the dynamic reconstruction of the airflow field in the grain storage of the present invention.

[0008] Figure 2 This is a flowchart of the partitioned airflow state recognition process of the present invention.

[0009] Figure 3 This is a flowchart of the dynamic reconfiguration decision-making process for the airflow field according to the present invention. Detailed Implementation

[0010] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0011] refer to Figures 1-3 The intelligent ventilation control system for grain warehouses based on dynamic airflow field reconstruction, as shown, includes: The airflow field zoning modeling module is used to establish a zoning foundation for airflow state identification and execution control before ventilation control begins in the grain silo. This module first determines the silo's length, width, height, inlet location, exhaust location, ventilation trough location, and duct connectivity using a silo space calibration unit. Then, it collects the static pressure and wind speed responses at different locations on the grain pile using a grain pile resistance acquisition unit. Finally, it records the variable frequency fan outlet pressure, inlet air condition, and exhaust air condition using an airflow boundary acquisition unit. The airflow field zoning generation unit then divides the silo space into multiple airflow reconstruction zones, establishing a mapping relationship between each zone and its corresponding sensors, zone inlet valves, zone exhaust valves, and guide vanes. The airflow reconstruction zones output by the airflow field zoning modeling module serve as the identification objects for the airflow state dynamic identification module and the control objects for the zoning execution control module.

[0012] The silo space calibration unit inputs the silo's geometric parameters and ventilation facility layout parameters before the grain silo is put into use. The silo's geometric parameters consist of the silo's length, width, height, height from the silo floor to the grain surface, and the grain surface slope. The ventilation facility layout parameters consist of the location of each ventilation trough, each air inlet, each air outlet, each zone's air inlet valve, each zone's air outlet valve, and each baffle plate. The silo space calibration unit divides the silo floor plane into several control grids. The boundary of each control grid coincides with the control boundary of adjacent ventilation troughs, silo walls, or valves, ensuring that the subsequently generated airflow reconstruction zones directly correspond to the actual executing components.

[0013] The grain pile resistance acquisition unit operates during the low-volume trial ventilation phase. The variable frequency fan control unit runs at a preset low frequency, allowing airflow into the grain pile without creating forced large-volume disturbances. The grain pile resistance acquisition unit reads the static pressure values ​​at each pressure measurement point at the bottom of the silo, the wind speed values ​​at each wind measurement point on the grain surface, and the changes in temperature and humidity at each temperature measurement point inside the grain pile. This unit does not directly determine the state of the grain pile; instead, it converts the static pressure response and wind speed response of each control grid into zoned resistance reference values, which are then used by the airflow field zoning generation unit to delineate the region boundaries.

[0014] The airflow boundary acquisition unit collects the boundary conditions on both the input and output sides of the ventilation system. The input side boundary conditions consist of inlet air temperature, inlet air relative humidity, inlet air pressure, fan outlet pressure, and fan frequency; the output side boundary conditions consist of exhaust air temperature, exhaust air relative humidity, exhaust air pressure, and exhaust outlet opening. The airflow boundary acquisition unit writes the data to the partitioned modeling cache according to a fixed sampling period and sets invalidation markers for obviously broken data to prevent invalid samples from entering the airflow field partition generation unit.

[0015] The airflow field zoning generation unit generates airflow reconstruction zones based on the control grid of the silo space calibration unit, the zoning resistance reference value of the grain pile resistance acquisition unit, and the boundary conditions of the airflow boundary acquisition unit. Each airflow reconstruction zone is bound to at least one silo bottom pressure measurement point, one grain surface wind measurement point, one grain pile temperature and humidity measurement point, one adjustable air intake actuator, and one adjustable air exhaust actuator. For areas near the silo wall, the airflow field zoning generation unit marks the silo wall heat dissipation effect as a boundary correction parameter; for areas near the air inlet, the airflow field zoning generation unit marks the air intake impact effect as an inlet correction parameter. The airflow field zoning generation unit finally outputs the zone number, zone boundary, sensor binding table, and actuator binding table.

[0016] The dynamic airflow state identification module uses the airflow reconstruction zones output by the airflow field zoning modeling module as the identification object, continuously analyzing the airflow state of each reconstructed zone during ventilation operation. This module first uses the zone pressure difference analysis unit to analyze the relationship between the bottom pressure and the exhaust pressure, then uses the zone wind speed analysis unit to analyze the difference between the grain surface wind speed and the wind speed of adjacent zones. Subsequently, the airflow deviation judgment unit identifies the deviation areas through which airflow concentrates, and the ventilation stagnation judgment unit identifies the stagnation areas where insufficient airflow enters. The dynamic airflow state identification module sends the identification results of deviation areas, stagnation areas, and normal ventilation areas to the dynamic airflow field reconstruction decision module, enabling subsequent reconstruction decisions to be made based on changes in the actual airflow path.

[0017] The zoned pressure differential analysis unit reads the corresponding pressure measurement points at the bottom of the silo, the exhaust pressure measurement point, and the fan outlet pressure measurement point according to the airflow reconstruction zone. This unit uses the pressure difference between the bottom pressure measurement point and the exhaust pressure measurement point as a real-time representation of the zoned ventilation resistance and saves the pressure change trend of the same airflow reconstruction zone over multiple consecutive sampling periods. The zoned pressure differential analysis unit also reads the pressure change trend of adjacent airflow reconstruction zones, and by comparing adjacent areas, determines whether the pressure change is caused by a change in the overall fan frequency or by a change in the local airflow path.

[0018] The zoned wind speed analysis unit reads wind speed data from the grain surface wind measurement points and the exhaust branch wind measurement points. This unit compares the grain surface wind speed of each airflow reconstruction zone with that of adjacent airflow reconstruction zones, and generates wind speed status markers for sudden increases, sudden decreases, and prolonged periods of low wind speed. The zoned wind speed analysis unit also correlates these wind speed status markers with the opening degrees of the zone's inlet and outlet valves to avoid misinterpreting wind speed changes caused by active valve adjustments as abnormal airflow within the grain pile.

[0019] The airflow deviation determination unit receives data from the zone pressure difference analysis unit and the zone wind speed analysis unit. When a certain airflow reconstruction zone has a low pressure difference, a high wind speed on the grain surface, and a decrease in wind speed in adjacent airflow reconstruction zones, the airflow deviation determination unit marks the airflow reconstruction zone as a deviation area. After the deviation area is marked, the airflow deviation determination unit further checks whether the area is close to the air inlet or the silo wall. If it is close to the air inlet, the deviation source is marked as an inlet concentration; if it is close to the silo wall, the deviation source is marked as a side wall channel; if it is located in the middle of the grain pile, the deviation source is marked as a local loose channel in the grain pile.

[0020] The ventilation stagnation determination unit receives data from the zone pressure difference analysis unit, the zone wind speed analysis unit, and the temperature and humidity measurement points of the grain pile. When a certain airflow reconstruction zone exhibits a high pressure difference, a low wind speed over the grain surface, and its temperature and humidity changes lag behind those of adjacent airflow reconstruction zones, the ventilation stagnation determination unit marks this airflow reconstruction zone as a stagnation area. The ventilation stagnation determination unit also determines whether the stagnation area is located on the downwind side of a deflection area. If it is, the source of the stagnation is marked as an airflow bypass; if it is not, the source of the stagnation is marked as an increase in local resistance of the grain pile.

[0021] The dynamic airflow reconstruction decision module receives the deflection zone, stagnation zone, and normal ventilation zone markers output by the dynamic airflow state identification module and converts these markers into reconstruction control commands that can be implemented by the execution components. This module first determines the target airflow distribution for the current ventilation stage through the ventilation target generation unit, then determines the intake paths that need to be increased, decreased, or closed through the intake path selection unit, and the exhaust path that needs to be increased, decreased, or closed through the exhaust path selection unit. Subsequently, the airflow allocation calculation unit generates airflow allocation parameters for each airflow reconstruction zone, and finally, the reconstruction command generation unit generates linkage commands for the variable frequency fan frequency, zone intake valve opening, zone exhaust valve opening, and guide vane attitude. The reconstruction commands generated by the dynamic airflow reconstruction decision module are sent to the zone execution control module, and the feedback correction and operation recording module returns the deviation data after execution to this module, enabling subsequent decisions to be further corrected.

[0022] The ventilation target generation unit determines the airflow distribution target based on the current operating stage of the grain warehouse. The operating stage consists of a cooling ventilation stage, a leveling ventilation stage, a dehumidification ventilation stage, and a storage inspection ventilation stage. In the cooling ventilation stage, the ventilation target generation unit designates the airflow reconstruction zones with higher grain pile temperatures as priority ventilation areas; in the leveling ventilation stage, the ventilation target generation unit designates the airflow reconstruction zones with significant differences in airflow distribution as leveling areas; in the dehumidification ventilation stage, the ventilation target generation unit designates the airflow reconstruction zones with high humidity and insufficient airflow as priority dehumidification areas; in the storage inspection ventilation stage, the ventilation target generation unit designates all airflow reconstruction zones as low-volume inspection areas.

[0023] The air intake path selection unit selects the air intake path based on the location of the deflection zone and the stagnant zone. For the deflection zone, the air intake path selection unit reduces the target opening of the air intake valve corresponding to the airflow reconstruction zone and checks whether the adjacent stagnant zone has the conditions for supplementary air. For the stagnant zone, the air intake path selection unit increases the target opening of the air intake valve corresponding to the airflow reconstruction zone and closes the air intake channel bypassing the deflection zone to the stagnant zone when an adjacent deflection zone exists. For the stagnant zone located near the silo wall, the air intake path selection unit preferentially selects the air intake path closer to the middle of the silo body to avoid forming a narrow channel airflow along the silo wall.

[0024] The exhaust path selection unit determines the exhaust path based on the exhaust branch wind speed data output by the zone wind speed analysis unit. For stagnant areas, the exhaust path selection unit checks whether the zone exhaust valves above or downwind of the area are not open enough. If the opening is insufficient, the target opening of the zone exhaust valve is increased; if the opening is already at a high level, an adjacent exhaust branch is selected to form an auxiliary exhaust path. For areas with deflected flow, the exhaust path selection unit reduces the suction intensity of the corresponding exhaust path in that area, so that the airflow no longer concentrates through that area. For areas with local backflow, the exhaust path selection unit changes the priority of the exhaust path, so that the airflow in the backflow area can leave the grain pile along a new exhaust branch.

[0025] The airflow allocation calculation unit converts the outputs of the ventilation target generation unit, the air intake path selection unit, and the exhaust path selection unit into zone airflow allocation parameters. The unit generates target airflow, target air intake opening, target exhaust opening, and fan frequency adjustment amount for each airflow reconstruction zone. During the calculation process, the unit sets upper limits for the actions of the executing components to prevent sudden changes in air pressure during a single adjustment. When multiple stagnant areas coexist, the airflow allocation calculation unit determines the zone adjustment sequence based on the duration of stagnant flow, the lag in temperature and humidity changes, and the intensity of adjacent flow deviations.

[0026] The reconfiguration instruction generation unit converts the zoned airflow allocation parameters output by the airflow allocation calculation unit into execution instructions. These execution instructions consist of variable frequency fan frequency instructions, zoned air inlet valve opening instructions, zoned air exhaust valve opening instructions, and guide vane attitude instructions. The reconfiguration instruction generation unit sorts all execution instructions by time, ensuring that the zoned air exhaust valve reaches the target opening first, then the zoned air inlet valve is adjusted, and finally the variable frequency fan frequency is changed. When it is necessary to adjust the guide vane attitude, the guide vane attitude instruction is executed before the fan frequency changes, preventing abnormal oscillation of the guide vane under high wind speed impact.

[0027] The zoned execution control module receives reconstruction commands from the dynamic airflow reconstruction decision module and converts these commands into actual equipment actions. This module controls the total airflow through the variable frequency fan control unit, the air intake ratio of different airflow reconstruction zones through the zoned air intake valve control unit, the exhaust path of different airflow reconstruction zones through the zoned exhaust valve control unit, changes the local airflow direction within the chamber through the guide vane attitude control unit, and limits conflicts between the fan, valves, and guide vanes through the execution interlock protection unit. After execution, the zoned execution control module sends the execution status to the feedback correction and operation recording module, which then determines whether the actual airflow field meets the reconstruction command requirements.

[0028] The variable frequency fan control unit receives the variable frequency fan frequency command output by the reconfiguration command generation unit and adjusts the fan frequency according to the ramp-up or ramp-down method. During the adjustment process, the variable frequency fan control unit continuously reads the fan outlet pressure. If the fan outlet pressure rises faster than a preset limit, the frequency increase is paused and the current frequency is maintained until the zone inlet valve control unit and zone exhaust valve control unit complete the opening correction. The variable frequency fan control unit also receives protection signals from the interlock protection unit. When the protection signal is triggered, the variable frequency fan control unit enters a low-frequency pressure holding state.

[0029] The zone air intake valve control unit controls the corresponding zone air intake valve according to the target air intake opening of each airflow reconstruction zone. The zone air intake valve control unit adopts a step-by-step operation mode, adjusting only a portion of the opening each time, and reading the valve position feedback signal after each operation. If the valve position feedback signal is inconsistent with the target opening, the zone air intake valve control unit first performs a reverse micro-motion, and then re-executes the opening adjustment; if the target opening is still not reached after readjustment, the zone air intake valve is marked as an execution anomaly, and an anomaly flag is sent to the execution interlock protection unit.

[0030] The zone exhaust valve control unit controls the corresponding zone exhaust valve according to the target exhaust opening degree of each airflow reconstruction zone. When increasing the exhaust path, the zone exhaust valve control unit first opens the target exhaust valve and then reduces the opening degree of the exhaust valve in the area to be weakened; when decreasing the exhaust path, it first keeps the adjacent exhaust valves in a ventilable state and then gradually closes the target exhaust valve. This sequence of actions is used to maintain continuous airflow inside the grain pile and prevent local areas from experiencing short periods without ventilation.

[0031] The guide vane attitude control unit adjusts the guide vane angle according to the guide vane attitude command. The guide vane is located inside the air inlet, inside the air outlet, or in the airflow channel within the silo. The guide vane attitude control unit first reads the current guide vane angle, and then operates in segments according to the target angle. For guide vanes near the air inlet, the guide vane attitude control unit performs angle adjustment after the variable frequency fan control unit drops to a low-frequency pressure holding state; for guide vanes near the air outlet, the guide vane attitude control unit performs angle adjustment after the zoned exhaust valve control unit completes the opening adjustment.

[0032] The interlock protection unit receives the operational status of the variable frequency fan control unit, the zone inlet valve control unit, the zone exhaust valve control unit, and the guide vane attitude control unit. When any zone inlet valve is not open, the interlock protection unit prevents the variable frequency fan control unit from increasing its frequency; when any zone exhaust valve has not formed an exhaust path, it prevents the corresponding inlet path from increasing; and when the guide vane attitude control unit performs an action, it limits the rapid increase of the fan frequency. The interlock protection unit also generates protection commands based on valve position abnormalities, air pressure abnormalities, and guide vane jamming markers, and sends these commands to the feedback correction and operation recording module.

[0033] The feedback correction and operation recording module is used to re-collect the airflow status inside the grain silo after the zonal execution control module completes the equipment action, and to correct the execution results of the reconstruction command. This module first uses the reconstruction result sampling unit to collect the zonal pressure difference, zonal wind speed, and zonal temperature and humidity after execution. Then, the airflow deviation correction unit judges the deviation between the airflow status after execution and the reconstruction target. Subsequently, the strategy parameter update unit updates the adjustment parameters in the airflow field dynamic reconstruction decision module. The operation record storage unit saves each reconstruction process and execution status, and in the event of sensor, valve, or fan malfunctions, the abnormal fallback control unit switches the system to a safe ventilation path. The correction parameters output by the feedback correction and operation recording module are returned to the airflow status dynamic identification module and the airflow field dynamic reconstruction decision module, enabling the system to continuously adjust the airflow field distribution during continuous ventilation.

[0034] The reconstruction result sampling unit initiates delayed sampling after the reconstruction command is executed. The delayed sampling time is determined based on the grain pile height and the current fan frequency, allowing sufficient time for the airflow to pass through the grain pile and generate a stable response at the grain surface wind measurement point. The reconstruction result sampling unit collects the bottom pressure, grain surface wind speed, exhaust branch wind speed, grain pile temperature, and grain pile humidity for each airflow reconstruction zone, and stores the sampled data and the data before execution in the same reconstruction record.

[0035] The airflow deviation correction unit compares the post-execution data collected by the reconstruction result sampling unit with the target data generated by the reconstruction instruction generation unit. If the wind speed in the stagnant area is still lower than the target state, the airflow deviation correction unit generates a compensation airflow mark; if the wind speed in the deflection area is still higher than the target state, the airflow deviation correction unit generates a continued reduction mark; if the wind speed direction or temperature and humidity changes in the local recirculation area are still abnormal, the airflow deviation correction unit generates a deflector readjustment mark. The airflow deviation correction unit also determines whether the deviation is caused by the execution component not being in place. If the execution component is not in place, the source of the deviation is marked as execution deviation; if the execution component is in place, the source of the deviation is marked as airflow path deviation.

[0036] The strategy parameter update unit updates the adjustment parameters in the airflow field dynamic reconstruction decision module based on the deviation source output by the airflow deviation correction unit. When the deviation source is an execution deviation, the strategy parameter update unit reduces the adjustment priority of the corresponding execution component in the next round of reconstruction and increases the linkage weight of adjacent execution components. When the deviation source is an airflow path deviation, the strategy parameter update unit adjusts the target inlet opening, target exhaust opening, and target angle of the deflector for that airflow reconstruction partition. The strategy parameter update unit does not change the partition boundaries generated by the airflow field partition modeling module. Only when the same positional deviation occurs in multiple consecutive rounds of reconstruction will a partition reconstruction request be sent to the airflow field partition generation unit.

[0037] The operation record storage unit establishes operation records according to the reconstruction process. Each operation record records the reconstruction time, airflow reconstruction zone status, deflection area marker, stagnation area marker, variable frequency fan frequency, zone inlet valve opening, zone exhaust valve opening, guide vane attitude, execution anomaly marker, and reconstruction result sampling data. The operation record storage unit uses a zone index method to save data, enabling subsequent retrieval to locate specific records according to airflow reconstruction zone, execution component, or operation stage.

[0038] The abnormal rollback control unit operates when the interlock protection unit sends a protection command or the reconstruction result sampling unit detects a sensor abnormality. The abnormal rollback control unit first determines the source of the abnormality. If the source is a single zone inlet valve, it closes the inlet valve and opens an adjacent available inlet path. If the source is a single zone exhaust valve, it keeps the adjacent exhaust valve open and reduces the airflow in the corresponding inlet path. If the source is abnormal variable frequency fan pressure, it switches the variable frequency fan control unit to low-frequency pressure maintenance mode. If the source is a critical sensor disconnection, it suspends the automatic reconstruction of the airflow reconstruction zone and maintains a safe ventilation path. After completing the rollback action, the abnormal rollback control unit writes the rollback status to the operation record storage unit and notifies the airflow field dynamic reconstruction decision module to regenerate an executable reconstruction command.

[0039] During operation, the airflow field zoning modeling module first completes the calibration of the storage space, the acquisition of grain pile resistance, the acquisition of airflow boundaries, and the generation of airflow field zoning, obtaining airflow reconstruction zoning that corresponds one-to-one with sensors and actuators. The airflow state dynamic identification module then identifies deflection areas, stagnant areas, and normal ventilation areas based on zoning pressure difference, zoning wind speed, and zoning temperature and humidity changes. The airflow field dynamic reconstruction decision module converts the identification results into reconstruction commands for air intake paths, exhaust paths, airflow distribution, and guide vane attitude. The zoning execution control module drives the variable frequency fan, zoning air intake valve, zoning exhaust valve, and guide vane to complete the actual actions according to the reconstruction commands. The feedback correction and operation recording module then acquires the airflow state after execution, determines whether the reconstruction result has reached the target state, and sends the correction parameters back to the airflow field dynamic reconstruction decision module.

[0040] Through this continuous closed-loop process, the ventilation control of the grain silo transforms from single fan start-stop control to dynamic reconfiguration control based on the zonal state of the airflow field. Each airflow reconfiguration zone has independent state identification data, path selection data, execution control data, and feedback correction data, enabling the system to perform zoned adjustment for airflow deviation, stagnation, and local backflow within the grain pile.

[0041] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart ventilation control system for grain warehouses based on dynamic airflow field reconstruction, characterized in that, The system consists of an airflow field zoning modeling module, an airflow state dynamic identification module, an airflow field dynamic reconstruction decision module, a zoning execution control module, and a feedback correction and operation recording module. The airflow field zoning modeling module is used to generate airflow reconstruction zones based on the grain warehouse space parameters, grain pile resistance response parameters and ventilation boundary parameters, and to establish the correspondence between the airflow reconstruction zones and sensors, zone air inlet valves, zone air exhaust valves and guide vanes; The airflow state dynamic identification module is used to collect data on the changes in zone pressure difference, zone wind speed, and zone temperature and humidity according to the airflow reconstruction zone, and to identify the deflection zone, stagnant zone, and normal ventilation zone based on the data on the changes in zone pressure difference, zone wind speed, and zone temperature and humidity. The dynamic airflow reconstruction decision module is used to generate reconstruction control commands based on the deflection area, stagnation area and normal ventilation area. The reconstruction control commands include variable frequency fan frequency commands, zone air inlet valve opening commands, zone air exhaust valve opening commands and guide vane attitude commands. The zone execution control module is used to control the variable frequency fan, zone air inlet valve, zone air outlet valve and guide vane to perform linked actions according to the reconfiguration control command; The feedback correction and operation recording module is used to collect data on the changes in zone pressure difference, zone wind speed, and zone temperature and humidity after the linkage action, and corrects the reconstruction control commands of the airflow field dynamic reconstruction decision module based on the collected results.

2. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 1, characterized in that, The airflow field zoning modeling module includes a warehouse space calibration unit, a grain pile resistance acquisition unit, an airflow boundary acquisition unit, and an airflow field zoning generation unit. The silo space calibration unit is used to input the silo length, silo width, silo height, height from the silo bottom to the grain surface, grain surface slope, air inlet position, air outlet position, ventilation trough position, zone air inlet valve position, zone air outlet valve position, and guide plate position. The grain pile resistance acquisition unit is used to collect static pressure values ​​at the bottom pressure measurement point, wind speed values ​​at the grain surface wind measurement point, and temperature and humidity measurement point change data of the grain pile during the low air volume test ventilation stage, and to form a zoned resistance reference quantity. The airflow boundary acquisition unit is used to collect inlet air temperature, inlet air relative humidity, inlet air pressure, fan outlet pressure, fan frequency, exhaust air temperature, exhaust air relative humidity, exhaust air pressure, and exhaust outlet opening. The airflow field zoning generation unit is used to generate airflow reconstruction zones based on the data from the silo space calibration unit, grain pile resistance acquisition unit, and airflow boundary acquisition unit. It also binds the silo bottom pressure measurement point, grain surface wind measurement point, grain pile temperature and humidity measurement point, zone air inlet valve, zone air outlet valve, and guide plate to each airflow reconstruction zone.

3. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 2, characterized in that, The airflow field zoning generation unit divides the bottom plane of the silo into multiple control grids. The boundaries of the control grids correspond to the control boundaries of the ventilation troughs, silo walls, or valves. The airflow field zoning generation unit merges the static pressure response, wind speed response, and ventilation boundary parameters of the control grids to form airflow reconstruction zones. It sets boundary correction parameters for airflow reconstruction zones near the silo walls and inlet correction parameters for airflow reconstruction zones near the air inlets.

4. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 1, characterized in that, The dynamic airflow state recognition module includes a zone pressure difference analysis unit, a zone wind speed analysis unit, an airflow deviation determination unit, and a ventilation stagnation determination unit. The zone pressure difference analysis unit is used to read the pressure measurement points at the bottom of the silo, the exhaust pressure measurement points, and the fan outlet pressure measurement points corresponding to the airflow reconstruction zone, and to generate the zone pressure difference change trend. The zoned wind speed analysis unit is used to read the wind speed data of the wind measurement points on the grain surface and the wind measurement points on the exhaust branch, and to generate wind speed status markers; The airflow deviation determination unit is used to mark an airflow reconstruction zone as a deviation area when the pressure difference in the airflow reconstruction zone is low, the wind speed on the grain surface is high, and the wind speed in the adjacent airflow reconstruction zone decreases. The ventilation stagnation determination unit is used to mark an airflow reconstruction zone as a stagnation area when the pressure difference in the airflow reconstruction zone is too high, the grain surface wind speed is too low, and the temperature and humidity changes in the zone lag behind those of the adjacent airflow reconstruction zones.

5. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 4, characterized in that, After generating the deviation area marker, the airflow deviation determination unit marks the source of deviation as concentrated inlet, side wall channel, or local loose channel in grain pile according to the positional relationship between the deviation area and the air inlet, silo wall, and middle of grain pile; after generating the stagnation area marker, the ventilation stagnation determination unit marks the source of stagnation as airflow bypass or local increased resistance in grain pile according to the upwind and downwind positional relationship between the stagnation area and the deviation area.

6. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 1, characterized in that, The dynamic reconfiguration decision module for airflow field includes a ventilation target generation unit, an air intake path selection unit, an exhaust path selection unit, an air volume distribution calculation unit, and a reconfiguration instruction generation unit. The ventilation target generation unit is used to determine the target airflow distribution based on the cooling ventilation stage, the equalization ventilation stage, the dehumidification ventilation stage, or the storage and inspection ventilation stage. The air intake path selection unit is used to reduce the target opening of the air intake valve in the corresponding zone of the deflection area and increase the target opening of the air intake valve in the corresponding zone of the stagnant area. The exhaust path selection unit is used to reduce the suction intensity of the exhaust path corresponding to the flow deviation area and increase the target opening degree of the exhaust valve of the corresponding zone in the stagnant flow area. The air volume distribution calculation unit is used to generate target air volume, target air inlet opening, target air outlet opening, and fan frequency adjustment amount according to the airflow reconstruction zone; The reconfiguration instruction generation unit is used to convert the target air volume, target air inlet opening, target air outlet opening, and fan frequency adjustment into variable frequency fan frequency instructions, zone air inlet valve opening instructions, zone air outlet valve opening instructions, and guide vane attitude instructions.

7. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 6, characterized in that, The reconfiguration command generation unit sorts the actions of the variable frequency fan frequency command, the zone air inlet valve opening command, the zone air exhaust valve opening command, and the guide vane attitude command, so that the zone air exhaust valve reaches the target opening first, the zone air inlet valve reaches the target opening next, and the variable frequency fan reaches the target frequency. When the reconfiguration control command includes the guide vane attitude command, the guide vane attitude command is executed before the variable frequency fan frequency changes.

8. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 1, characterized in that, The zoned execution control module includes a variable frequency fan control unit, a zoned air inlet valve control unit, a zoned air outlet valve control unit, a guide vane attitude control unit, and an execution interlock protection unit; The variable frequency fan control unit is used to adjust the frequency of the variable frequency fan according to the ramp-up or ramp-down frequency method. The zone air inlet valve control unit is used to adjust the opening of the zone air inlet valve according to the step-by-step action mode, and to correct the action of the zone air inlet valve according to the valve position feedback signal; The zone exhaust valve control unit is used to first open the target zone exhaust valve when increasing the exhaust path, and then reduce the opening of the zone exhaust valve in the area to be weakened. The deflector attitude control unit is used to adjust the deflector angle in segments according to the deflector attitude command; The interlock protection unit is used to limit the frequency increase of the variable frequency fan when the zone air inlet valve is not open, to limit the increase of the corresponding air inlet path when the zone exhaust valve has not formed an exhaust path, and to limit the rapid increase of the frequency of the variable frequency fan when the guide plate attitude control unit performs an action.

9. The intelligent ventilation control system for grain storage based on dynamic airflow field reconstruction according to claim 1, characterized in that, The feedback correction and operation recording module includes a reconstruction result sampling unit, an airflow deviation correction unit, a strategy parameter update unit, an operation record storage unit, and an abnormal rollback control unit; The reconstruction result sampling unit is used to collect the bottom pressure, grain surface wind speed, exhaust branch wind speed, grain pile temperature and grain pile humidity of each airflow reconstruction zone after the reconstruction control command is executed; The airflow deviation correction unit is used to compare the data collected by the reconstruction result sampling unit with the target data corresponding to the reconstruction control command, and generate compensation airflow mark, continued reduction mark or deflector readjustment mark; The strategy parameter update unit is used to correct the target air intake opening, target air exhaust opening, and target angle of the deflector in the dynamic reconstruction decision module of the airflow field based on the compensation air intake mark, the continued reduction mark, or the deflector readjustment mark. The operation record storage unit is used to save the reconstruction time, airflow reconstruction zone status, deflection zone marker, stagnation zone marker, variable frequency fan frequency, zone air inlet valve opening, zone air outlet valve opening, guide vane attitude, execution anomaly marker, and reconstruction result sampling data; The abnormal rollback control unit is used to switch the system to a safe ventilation path when there is a sensor malfunction, valve malfunction, fan pressure malfunction, or baffle jamming, and sends the rollback status to the operation record storage unit.

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