Intelligent linkage adjustment and energy-saving control device for cold and hot air of large-tonnage grain dryer

Abstract

The invention relates to the technical field of grain drying, in particular to a large-tonnage grain dryer cold and hot air intelligent linkage adjustment and energy-saving control device which comprises a drying chamber body, a cold air opening, a hot air opening, an air door linkage mechanism and a PID control model. The air door linkage mechanism is driven by an electric push rod to achieve dynamic adjustment, and flexible linkage of the main air door and the auxiliary air door meets the requirement for regional independent control. The multi-zone temperature sensors monitor data in real time, the proportion of cold air and hot air is dynamically adjusted in combination with a PID algorithm, the temperature and humidity control precision is remarkably improved, and energy consumption is reduced. The device optimizes the airflow distribution, reduces the unit energy consumption by 15-20%, and meets the high-efficiency and energy-saving requirements of modern agriculture.

Description

Technical Field

[0001] The present invention belongs to the technical field of grain processing and agricultural machinery, and specifically relates to an intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer. Background Art

[0002] With the continuous development of grain drying technology, large-tonnage grain dryers play a vital role in agricultural production and grain storage. However, existing grain dryers still have significant deficiencies in intelligent linkage adjustment of hot and cold air and energy-saving control, which affects drying efficiency, energy consumption, and ease of operation.

[0003] After searching, an energy-saving control system for a grain dryer was disclosed with the publication number CN108036635B, and the publication date was November 29, 2019. This patent achieves energy saving and efficiency improvement in the grain drying process by arranging structures such as humidity sensors, heating rods, heating cylinders and protective screen covers in the dryer cylinder. Specifically, the grain is kept in a loose state in the drying box and is further dried by the heating rods in the heating cylinder. At the same time, high-temperature gas circulation is used to fill the dryer cylinder to save energy. However, this technical solution mainly relies on a single heating system and lacks intelligent control means for the linkage adjustment of cold and hot air. It is impossible to dynamically adjust the ratio and flow of cold and hot air according to the real-time status of the grain, which may lead to problems of uneven drying or energy waste. In addition, the system does not involve optimized designs for large-tonnage grain drying scenarios, and there may be risks of efficiency bottlenecks and increased energy consumption when processing large quantities of grain.

[0004] In addition, a dehumidification device and control method for a small experimental baking room with publication number CN113834311B (publication date November 21, 2023) forms a small-scale exhaust route when the heat pump unit is in the dehumidification working condition through the linkage control of electric blinds and exhaust air valves, and promptly discharges the heat generated by the condenser, thereby reducing the heat fluctuation in the smoke chamber and improving the stability of the baking temperature. However, this technical solution is mainly aimed at small-scale experimental baking rooms, and its cold and hot air linkage control mechanism is relatively simple, and lacks adaptability to complex working conditions in large-tonnage grain drying scenarios. At the same time, the solution does not fully consider the energy-saving control strategy, which may lead to energy waste and cannot effectively meet the energy-saving needs of large-scale grain drying.

[0005] The above-mentioned existing technologies show that the current hot and cold air linkage control technology has the following shortcomings when applied to large-tonnage grain dryers: First, the accuracy and adaptability of the intelligent linkage adjustment of hot and cold air are insufficient, making it difficult to meet the high-precision control requirements of temperature and humidity during the grain drying process; second, the energy-saving control strategy is not perfect, resulting in high energy consumption and affecting overall economic benefits. For example, it is difficult to achieve a significant reduction in unit energy consumption in traditional systems, and in practical applications, a technical solution that can reduce unit energy consumption by 15%-20% is urgently needed. In addition, the existing technology lacks a scientific design of the ratio of the cold air outlet area to the hot air outlet area, as well as an intelligent control model that dynamically adjusts the hot and cold air ratio based on real-time monitoring data, which limits the efficiency and energy-saving effect of the drying process. Summary of the Invention

[0006] The present invention proposes an intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer. The device aims to optimize the spatial layout design of the cold air outlet (on both sides) and the hot air outlet (in the middle), combine the damper linkage mechanism driven by an electric push rod, form a regional independent control mode, and improve the accuracy of temperature and humidity control; at the same time, an efficient energy-saving control strategy is introduced, and a PID control model based on multi-zone temperature data is established to dynamically adjust the ratio of hot and cold air to achieve efficient and energy-saving large-tonnage grain drying operations to meet the needs of modern agricultural production.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer, comprising a drying chamber main body, wherein cold air outlets are symmetrically provided on both sides of the drying chamber main body, and a hot air outlet is provided in the middle area; the cold air outlet and the hot air outlet are connected through an air duct, and each air duct is equipped with a damper linkage mechanism driven by an electric push rod for dynamically adjusting the ratio of cold and hot air; the damper linkage mechanism comprises a main damper and two auxiliary dampers, the main damper is located at the hot air outlet, and the auxiliary dampers are respectively located at the cold air outlets on both sides; the main damper and the auxiliary damper are connected by a linkage rod to form a synchronous or asynchronous opening and closing mode; a multi-zone temperature sensor is also installed inside the drying chamber main body for real-time monitoring of the temperature data of each zone, and dynamically adjusting the ratio of cold and hot air based on a PID control model.

[0008] Preferably, the area calculation formulas of the cold air outlet and the hot air outlet are: cold air outlet area Hot air outlet area where Q c and Q h are the design flow rates of cold air and hot air respectively, v c and v h are the flow rates of cold air and hot air respectively; the ratio of the area of cold air outlet to hot air outlet satisfies Where k is the proportional coefficient, ranging from 1.2 to 1.5, to ensure a balanced supply of hot and cold air.

[0009] Preferably, the data table of the corresponding relationship between the damper opening and the temperature deviation shows that when the temperature deviation is within ±2°C, the damper opening is maintained at 30%-50%; when the temperature deviation exceeds ±2°C, the damper opening is linearly increased to 70%-100% to quickly compensate for temperature fluctuations; the relationship between the damper opening and the temperature deviation can be calculated by the formula θ=α·ΔT+β, where θ is the damper opening, ΔT is the temperature deviation, the correction coefficient α=5±0.5 (temperature deviation compensation rate), β=30±3 (basic opening reference value), and is calibrated by linear regression method.

[0010] Preferably, a multi-zone temperature sensor is installed inside the main body of the drying chamber for real-time monitoring of the temperature data of each zone and dynamic adjustment of the hot and cold air ratio based on the PID control model. The algorithm module process of the PID control model includes the following steps: S1, collecting data from multi-zone temperature sensors and calculating the average temperature deviation; S2, calculating the hot and cold air ratio adjustment amount according to the temperature deviation; S3, outputting a control signal to the damper linkage mechanism driven by the electric push rod to complete the damper opening adjustment; S4, real-time feedback of the adjusted temperature data for closed-loop optimization. The formula of the PID control model is:

[0011]

[0012] Among them, u(t) is the control output, e(t) is the temperature deviation, K p , K i , K d They are proportional, integral and differential coefficients respectively. The proportional coefficient Kp ranges from 0.8 to 1.5, the integral time constant Ti = Kp / Ki is set to 2 to 5 seconds, and the differential time constant Td = Kd / Kp is set to 0.1 to 0.5 seconds.

[0013] Preferably, the cold air outlet and the hot air outlet are both arranged inclined toward the first direction, with an inclination angle of 15°-20°, so as to optimize the airflow distribution; the main air door and the auxiliary air door of the air door linkage mechanism are flexibly linked through an elastic connecting piece, and the elastic connecting piece is made of silicone rubber with a Shore hardness of 60±5 and a tensile strength ≥8Mpa.

[0014] Preferably, the opening degrees of the main damper and the auxiliary damper of the damper linkage mechanism are set to 50% in the initial state, and the opening degrees are dynamically adjusted according to the temperature deviation detected by the multi-zone temperature sensor.

[0015] Preferably, the area design of the cold air outlet and the hot air outlet meets the demand for balanced supply of cold and hot air, and the effective ventilation area A of the cold air outlet is c With hot air outlet A h Satisfy 1.2≤A c / (A h·ρ)≤1.5, where ρ is the air density correction factor ρ=0.98-1.02.

[0016] Preferably, the multi-zone temperature sensors are respectively installed in the upper, middle and lower areas inside the drying chamber body, with 3 sensors set in each area, for a total of 9 sensors.

[0017] Preferably, the large-tonnage grain drying method uses the above-mentioned large-tonnage grain dryer hot and cold air intelligent linkage adjustment and energy-saving control device, including the following steps: S1, start the hot air outlet heating system, and at the same time start the cold air outlet cooling system, and the damper opening is set to 50% in the initial state; S2, collect multi-zone temperature sensor data in real time, and dynamically adjust the hot and cold air ratio based on the PID control model; S3, adjust the main damper and auxiliary damper opening through the damper linkage mechanism driven by the electric push rod to achieve independent control of each area; S4, continuously monitor temperature changes to ensure that the temperature deviation is maintained within ±2°C, and record energy consumption data at the same time.

[0018] Compared with the existing technology, the beneficial effects of the present invention are: through the optimization of the spatial layout of the cold air outlet and the hot air outlet and the innovative design of the damper linkage mechanism, the intelligent linkage adjustment of the cold and hot air is realized, and the accuracy of temperature and humidity control is significantly improved; at the same time, the dynamic adjustment strategy based on the PID control model effectively reduces energy consumption, and the unit energy consumption is reduced by 15%-20%; in addition, the independent control mode of each area enhances the adaptability of the device to complex working conditions, and meets the high-efficiency and energy-saving needs of large-tonnage grain drying in modern agricultural production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural diagram of the cold air outlet and the hot air outlet;

[0021] Figure 3 Schematic diagram of the elastic connector structure;

[0022] Figure 4 It is the flow chart of the PID control model algorithm module;

[0023] Figure 5 This is a line graph showing the relationship between the air door opening and the temperature deviation.

[0024] In the figure: 1 drying chamber main body, 2 cold air outlet, 3 hot air outlet, 4 air duct, 5 electric push rod, 6 air door linkage mechanism, 61 main air door, 62 auxiliary air door, 63 linkage rod, 64 elastic connecting piece, 7 multi-zone temperature sensor. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The present invention relates to a large-tonnage grain dryer with intelligent linkage adjustment and energy-saving control device for hot and cold air, and its specific implementation is described in detail with reference to the accompanying drawings and actual application scenarios. Figure 1 As shown, the device includes a drying chamber body 1, with cold air outlets 2 symmetrically arranged on both sides, and a hot air outlet 3 arranged in the middle area. The cold air outlet 2 and the hot air outlet 3 are connected by an air duct 4. The outlets of the cold air outlet 2 and the hot air outlet 3 are both equipped with a damper linkage mechanism 6 driven by an electric push rod 5, which is used to dynamically adjust the ratio of cold and hot air. The damper linkage mechanism 6 includes a main damper 61 and two auxiliary dampers 62. The main damper 61 is located at the hot air outlet 3, and the auxiliary dampers 62 are respectively located at the cold air outlets 2 on both sides. The main damper 61 and the auxiliary damper 62 are connected by a linkage rod 63 to form a synchronous or asynchronous opening and closing mode. In addition, a multi-zone temperature sensor 7 is also installed inside the drying chamber body 1 to monitor the temperature data of each zone in real time and dynamically adjust the ratio of cold and hot air based on the PID control model.

[0027] In the specific implementation process, the spatial layout design of the cold air outlet 2 and the hot air outlet 3 is one of the keys to achieve efficient cold and hot air regulation. Figure 2 As shown, the cold air outlet 2 is symmetrically arranged on both sides of the drying chamber body 1, and the hot air outlet 3 is located in the middle area. This layout ensures the uniformity of air flow distribution and avoids the occurrence of local overheating or overcooling. According to the description in the invention content, the cold air outlet area A c And hot air outlet area A h The calculation formulas are cold air outlet area Hot air outlet area where Q c and Q h are the design flow rates of cold air and hot air respectively, v c and v h are the flow rates of cold air and hot air respectively; the ratio of the area of cold air outlet to hot air outlet satisfies Where k is the proportional coefficient, which ranges from 1.2 to 1.5 to ensure the balanced supply of hot and cold air. In practical applications, for example, when the cold air design flow rate Q c The cold air velocity v is 5000 cubic meters per hour. c When the speed is 5 m / s, the cold air outlet area A c Can be calculated as Square meters; Similarly, if the hot air design flow rate Q hThe hot air velocity v is 4000 cubic meters per hour. h is 4 m / s, then the hot air outlet area Ah is At this time, the ratio of the cold air outlet to the hot air outlet area In order to ensure the balanced supply of hot and cold air, the cold air outlet area needs to be appropriately increased so that the proportional coefficient k falls within the range of 1.2 to 1.5. For example, if the cold air outlet area is adjusted to 1200 square meters, Meet design requirements.

[0028] The operating principle of the damper linkage mechanism 6 is one of the core technologies of this device. Figure 2-3 As shown, the main damper 61 and the auxiliary damper 62 are connected by a linkage rod 63. The linkage rod 63 is provided with an elastic connector 64 to achieve flexible linkage and avoid adjustment errors caused by mechanical rigidity. In the initial state, the damper opening is set to 50%, that is, the main damper 61 and the auxiliary damper 62 are both in a half-open state. Figure 5 As shown, when the multi-zone temperature sensor 7 detects that the temperature deviation of a certain area exceeds ±2°C, the system will adjust the damper opening according to the corresponding relationship between the damper opening and the temperature deviation. When the temperature deviation is within ±2°C, the damper opening is maintained at 30%-50%; when the temperature deviation exceeds ±2°C, the damper opening is linearly increased to 70%-100% to quickly compensate for temperature fluctuations. Specifically, the relationship between the damper opening and the temperature deviation can be calculated by the formula θ=α·ΔT+β, where θ is the damper opening, ΔT is the temperature deviation, the correction coefficient α=5±0.5 (temperature deviation compensation rate), β=30±3 (basic opening reference value), and is calibrated by linear regression method. For example, when the temperature deviation ΔT is 4°C, the damper opening θ is calculated as θ=5·4+30=50%, that is, the damper opening is adjusted to 50%. If the temperature deviation further increases to 8° C., the damper opening is calculated as θ=5·8+30=70%, and the damper opening is adjusted to 70%.

[0029] The algorithm module flow chart of the PID control model is as follows: Figure 4 As shown, the specific implementation process includes the following steps: first, collecting data from multiple zone temperature sensors 7 and calculating the average temperature deviation e(t); second, calculating the cold and hot air ratio adjustment amount based on the temperature deviation, outputting a control signal to the damper linkage mechanism 6 driven by the electric push rod 5 to complete the damper opening adjustment; finally, providing real-time feedback on the adjusted temperature data for closed-loop optimization. The formula of the PID control model is:

[0030]

[0031] Among them, u(t) is the control output, e(t) is the temperature deviation, K p , K i , K dThese are the proportional, integral, and differential coefficients, respectively. The proportional coefficient Kp ranges from 0.8 to 1.5, the integral time constant Ti = Kp / Ki is set to 2 to 5 seconds, and the differential time constant Td = Kd / Kp is set to 0.1 to 0.5 seconds. Parameter Acquisition Method: PID parameters are tuned online using the gradient descent method, with the convergence condition set to an error of ≤ 0.5°C for three consecutive iterations.

[0032] For example, in a certain application scenario, the proportional coefficient K is set p =1.2, integral coefficient K i =

[0033] 0.8, differential coefficient K d =0.5. When the temperature deviation e(t) is 3°C, the calculation process of the control output u(t) is as follows:

[0034]

[0035] Assuming the integration time is 10 seconds, the integral term differential term Therefore, the control output u(t) is:

[0036] u(t)=1.2·3+0.8·30+0.5·0=3.6+24+0=27.6

[0037] The control output value will be transmitted as a signal to the electric push rod 5, driving the damper linkage mechanism 6 to adjust the damper opening, thereby realizing dynamic adjustment of the ratio of cold and hot air.

[0038] The tilted arrangement design of the cold air outlet 2 and the hot air outlet 3 is as follows Figure 2 As shown, its inclination angle is 15°-20° to optimize the airflow distribution. In actual applications, the cold air outlet 2 and the hot air outlet 3 are both arranged to be inclined toward the first direction, for example, inclined 15° to the right. This design can effectively reduce the airflow dead angle and improve the coverage and uniformity of the airflow. In addition, the main air door 61 and the auxiliary air door 62 of the air door linkage mechanism 6 are flexibly linked through the elastic connecting member 64 to avoid adjustment errors caused by mechanical rigidity. For example, in a certain test, when the opening of the main air door 61 was adjusted to 70%, the opening of the auxiliary air door 62 was synchronously adjusted to 60%, but due to the presence of the elastic connecting member 64, the actual opening of the auxiliary air door 62 was slightly lower than the theoretical value, about 58%. This slight deviation was automatically compensated by the system to ensure the overall adjustment accuracy.

[0039] Table 2 shows comparative test data, demonstrating a significant reduction in specific energy consumption after using this device. For example, when processing the same tonnage of grain, the traditional system consumes 0.8 kWh / t, while this device reduces this to 0.64-0.68 kWh / t, a 15%-20% reduction. This energy saving is attributed to the intelligent coordinated regulation of hot and cold air and the dynamic adjustment strategy of the PID control model. In one practical application, a grain processing plant used this device to process 100 tons of grain. The traditional system consumed 80 kWh, while this device consumed only 64 kWh, achieving significant energy savings.

[0040]

[0041] Table 2

[0042] Experimental data description:

[0043] 1. Comparison of unit energy consumption

[0044] Traditional system: 0.80kWh / t

[0045] This device: 0.64kWh / t (minimum value), calculated based on 100 tons of measured data:

[0046] 64kWh÷100t=0.64kWh / t

[0047] Energy saving rate: (0.80-0.64) / 0.80×100%=20% (based on the measured extreme value)

[0048] 2. 100 tons of grain processing case

[0049] Traditional system power consumption: 100t×0.80kWh / t=80kWh

[0050] Power consumption of this device: 64kWh (measured value)

[0051] Power saving: 80-64=16kWh

[0052] Energy saving rate: (16÷80)×100%=20%

[0053] 3. Quantification of technological advantages

[0054] Intelligent linkage of hot and cold air: reduces ineffective hot air emission and improves heat recovery efficiency by approximately 18%

[0055] PID dynamic control: The drying temperature fluctuation range is narrowed from ±3°C to ±0.5°C, reducing the risk of overdrying.

[0056] Environmental adaptability: At an ambient temperature of 25±2℃, the energy consumption stability of this device reaches ±0.02kWh / t

[0057] Moisture content control accuracy: Final moisture content deviation ≤ 0.5% (better than the national standard requirement of ±1%)

[0058] Economic benefit calculation: Based on an electricity price of 0.8 yuan / kWh and an annual processing capacity of 10,000 tons:

[0059] Annual electricity cost savings = 10,000t × (0.80-0.64)kWh / t × 0.8 yuan / kWh = 12,800 yuan.

[0060] The distribution of the multi-zone temperature sensors 7 is as follows Figure 1 As shown, its installation position has been carefully designed to ensure the comprehensiveness and accuracy of temperature data. For example, inside the drying room body 1, temperature sensors 7 are installed in the upper, middle and lower areas respectively, with 3 sensors in each area, for a total of 9 sensors. These sensors collect temperature data from each area in real time and transmit the data to the control system for calculating the average temperature deviation and adjusting the ratio of hot and cold air. In a certain test, the temperature in the upper area was 50°C, the temperature in the middle area was 48°C, the temperature in the lower area was 46°C, and the average temperature was If the target temperature is 50°C, the temperature deviation e(t) is 50-48=2°C. The system will adjust the ratio of hot and cold air according to the PID control model to ensure that the temperature deviation is maintained within ±2°C.

[0061] In summary, this invention achieves intelligent, coordinated regulation of hot and cold airflow and energy-saving control by optimizing the spatial layout of the cold and hot air outlets, innovating the structure of the damper linkage mechanism, and introducing a PID control model. In practical applications, this device significantly improves the accuracy of temperature and humidity control while reducing energy consumption, meeting the energy-efficient needs of large-tonnage grain drying in modern agricultural production.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for intelligently linking hot and cold air flow regulation and energy-saving control of a large-tonnage grain dryer, comprising a drying chamber body (1), characterized in that: Cold air outlets (2) are symmetrically arranged on both sides of the drying chamber body (1), and a hot air outlet (3) is arranged in the middle area. The cold air outlets (2) and the hot air outlets (3) are connected through an air duct (4). A damper linkage mechanism (6) driven by an electric push rod (5) is installed at the outlet of each of the cold air outlets (2) and the hot air outlet (3) for dynamically adjusting the ratio of cold and hot air. The damper linkage mechanism (6) includes a main damper (61) and two auxiliary dampers (62). The main damper (61) is located at the hot air outlet (3), and the auxiliary dampers (62) are respectively located at the cold air outlets (2) on both sides. The main damper (61) and the auxiliary damper (62) are connected by a linkage rod (63) to form a synchronous or asynchronous opening and closing mode.

2. The intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer according to claim 1 is characterized in that: The cold air outlet (2) has an area A c And hot air outlet area A h The calculation formulas are cold air outlet area Hot air outlet area where Q c and Q h are the design flow rates of cold air and hot air respectively, v c and v h are the flow rates of cold air and hot air respectively; the ratio of the area of cold air outlet to hot air outlet satisfies Where k is the proportional coefficient, ranging from 1.2 to 1.5, to ensure a balanced supply of hot and cold air.

3. The intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer according to claim 1 is characterized in that: The relationship between the damper opening and the temperature deviation is calculated by the formula θ=α·ΔT+β, where θ is the damper opening, ΔT is the temperature deviation, the correction coefficient α=5±0.5 (temperature deviation compensation rate), β=30±3 (basic opening reference value), and is calibrated by linear regression method.

4. The intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer according to claim 1 is characterized in that: A multi-zone temperature sensor (7) is installed inside the drying chamber body (1) for real-time monitoring of temperature data in each zone and dynamic adjustment of the ratio of hot and cold air based on a PID control model; the formula of the PID control model is: The formula of the PID control model is: Among them, u(t) is the control output, e(t) is the temperature deviation, K p , K i , K d They are proportional, integral and differential coefficients respectively. The proportional coefficient Kp ranges from 0.8 to 1.5, the integral time constant Ti = Kp / Ki is set to 2 to 5 seconds, and the differential time constant Td = Kd / Kp is set to 0.1 to 0.5 seconds.

5. The intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer according to claim 1 is characterized in that: The cold air outlet (2) and the hot air outlet (3) are both arranged to be inclined toward the first direction, with an inclination angle of 15° to 20°; the main air door (61) and the auxiliary air door (62) of the air door linkage mechanism (6) are flexibly linked via an elastic connecting member (64), and the elastic connecting member (64) is made of silicone rubber with a Shore hardness of 60±5 and a tensile strength of ≥8MPa.

6. The intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer according to claim 1 is characterized in that: The main damper (61) and the auxiliary damper (62) of the damper linkage mechanism (6) are initially opened at 50%, and the opening is dynamically adjusted according to the temperature deviation detected by the multi-zone temperature sensor (7).

7. The intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer according to claim 1 is characterized in that: The area design of the cold air outlet (2) and the hot air outlet (3) meets the demand for balanced supply of cold and hot air. The effective ventilation area A of the cold air outlet is c With hot air outlet A h Satisfy 1.2≤A c / (A h ·ρ)≤1.5, where ρ is the air density correction factor ρ=0.98-1.

02.

8. The intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer according to claim 1 is characterized in that: The multi-zone temperature sensors (7) are respectively installed in the upper, middle and lower areas inside the drying chamber body (1), with three sensors being provided in each area, for a total of nine sensors.

9. A large-tonnage grain drying method, characterized in that: The use of the intelligent linkage adjustment and energy-saving control device for hot and cold air of a large-tonnage grain dryer as described in any one of claims 1 to 8 comprises the following steps: starting the hot air outlet (3) heating system and simultaneously opening the cold air outlet (2) cooling system, with the damper opening set to 50% in the initial state; collecting data from multi-zone temperature sensors (7) in real time, and dynamically adjusting the hot and cold air ratio based on a PID control model; adjusting the opening of the main damper (61) and the auxiliary damper (62) through a damper linkage mechanism (6) driven by an electric push rod (5) to achieve independent control of each zone; continuously monitoring temperature changes to ensure that the temperature deviation is maintained within ±2°C, and recording energy consumption data at the same time.

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