High-efficiency quality-keeping grain variable-temperature drying system and method

Abstract

The application discloses a high-efficiency quality-keeping grain variable-temperature drying system and method, which comprises a drying machine, a detection assembly and a control assembly; the drying machine comprises a drying chamber for containing grains and a heat pump assembly for heating the drying chamber; the detection assembly comprises a temperature sensor and a moisture meter for detecting the temperature and the moisture content of the grains in the drying chamber respectively; and the control assembly controls the heating temperature of the heat pump assembly on the drying chamber according to the temperature and the moisture content of the grains in the drying chamber. The application can improve the drying efficiency of the grains and meanwhile keep the quality of the grains from being affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain drying, in particular to a high-efficiency quality-keeping grain variable-temperature drying system and method. BACKGROUND

[0002] Rice is the seed of rice. After harvesting, the rice still has strong vitality. The vitality is usually represented by indicators such as germination rate, germination potential, and enzyme activity. The better the quality of the rice, the higher the germination rate or germination potential. If the rice still has strong vitality after drying or storage, it means that the quality is well maintained and the germination rate is high. If the rice has weak vitality after drying and processing, the drying quality will be poor and the germination rate will decrease. Therefore, the drying quality of the rice can be evaluated by the germination rate. During drying, the rice exchanges heat and moisture with hot air, absorbs heat from the hot air, and causes the temperature of the rice itself to rise. The internal starch and enzymes of the rice will undergo certain thermal denaturation, and the organizational structure may also be damaged. This leads to a decrease in vitality. Generally speaking, when using hot air to heat and dry the rice, the higher the temperature of the hot air, the faster the drying speed and the higher the drying efficiency. However, the higher the drying temperature, the greater the damage to the vitality of the rice, and the poorer the drying quality of the rice. Therefore, maintaining the quality of the rice and improving the drying efficiency of the rice are a pair of contradictory problems.

[0003] Current rice drying, regardless of the initial moisture content or the change in moisture content during drying, uses a constant temperature hot air drying process with fixed air temperature and constant air volume. For example, patent CN112229195A discloses a rice dryer, which includes a drying box, a partition plate is welded on the inner wall of the drying box, the partition plate divides the inside of the drying box into a drying area and a treatment area, an inlet is formed through the inner wall of the drying area, a sealing plate is rotatably connected to the inner wall of the inlet by a torsion spring, a deformation layer is glued to the bottom of the sealing plate, a motor is welded to the bottom of the drying box, the main shaft of the motor penetrates the inner bottom of the drying area and is welded to a dragon shaft, and a circulation device is provided inside the drying box. Although hot air can be injected into the inside of the drying box through the air inlet, the hot air flow can reach the inside of the drying area along the L-shaped groove and the communication groove, the drying of the rice can be achieved, the communication grooves are arranged at equal distances, the hot air flow entering the drying area is more uniform, the drying effect is more uniform, the dragon shaft is rotated by the motor, the drying effect of the hot air flow is improved, and the drying efficiency is effectively increased. However, the drying temperature of the rice cannot be adjusted in real time. If a higher drying temperature is used, although the drying efficiency can be significantly increased, the germination rate of the rice will be greatly affected, resulting in a significant decrease in drying quality. If a lower drying temperature is used, although the germination rate of the rice is not affected and the drying quality is high, the drying efficiency is significantly decreased.

[0004] Therefore, how to provide a drying system that takes into account the drying quality and drying efficiency is an urgent problem in the art. SUMMARY

[0005] In view of the defects in the prior art, the present application provides a high-quality grain variable temperature drying system and method. The drying efficiency of the grain can be improved while the quality of the grain is not affected.

[0006] In a first aspect, the present application provides a high-quality grain variable temperature drying system, comprising a drying machine, a detection assembly and a control assembly;

[0007] The drying machine comprises a drying chamber containing grains and a heat pump assembly for heating the drying chamber;

[0008] The detection assembly comprises a temperature sensor and a moisture meter for detecting the temperature and moisture content of the grains in the drying chamber, respectively;

[0009] The control assembly controls the heating temperature of the heat pump assembly in the drying chamber according to the temperature and moisture content of the grains in the drying chamber.

[0010] Further, the heat pump assembly comprises an air outlet unit and a heating unit, the air outlet unit inputs dry gas into the drying chamber, and the heating unit heats the dry gas input into the drying chamber by the air outlet unit.

[0011] Further, the temperature sensor is uniformly provided with a plurality of temperature sensors along the length direction of the drying chamber, and the adjacent temperature sensors are arranged at equal intervals, and the moisture meter is uniformly provided with a plurality of moisture meters along the length direction of the drying chamber, and the adjacent moisture meters are arranged at equal intervals.

[0012] Further, according to the temperature and moisture content of the grains in the drying chamber, the heating temperature of the heat pump assembly in the drying chamber is controlled, comprising:

[0013] Obtaining the real-time temperature and moisture content detected by the temperature sensor and the moisture meter;

[0014] Processing and analyzing the real-time moisture content to obtain the real-time maximum tolerance temperature of the grains;

[0015] According to the real-time maximum tolerance temperature, a target temperature is obtained;

[0016] Based on the real-time temperature and the target temperature, the heating temperature of the heat pump assembly in the drying chamber is adjusted.

[0017] Further, the real-time maximum tolerance temperature satisfies the following relationship:

[0018] ;

[0019] In the formula, t max is the real-time maximum tolerance temperature, M is the real-time moisture content, and a, b and c are constants.

[0020] Further, based on the real-time temperature and the target temperature, the heating temperature of the heat pump assembly to the drying chamber is adjusted, including:

[0021] Obtaining a temperature change rate table of the drying chamber at different temperatures when the heat pump assembly heats at different temperatures;

[0022] According to the temperature change rate table and the real-time temperature, a temperature increment factor corresponding to the real-time temperature is obtained;

[0023] Calculating the difference between the real-time temperature and the target temperature;

[0024] Based on the real-time temperature, the temperature increment factor, and the difference between the real-time temperature and the target temperature, the heating temperature of the heat pump assembly to the drying chamber is obtained by processing;

[0025] According to the obtained heating temperature, the actual temperature output by the heat pump assembly is adjusted.

[0026] Further, based on the real-time temperature, the temperature increment factor, and the difference between the real-time temperature and the target temperature, the heating temperature of the heat pump assembly to the drying chamber is obtained by processing, satisfying the following relationship:

[0027] ;

[0028] In the formula, T2' is the heating temperature of the heat pump assembly to the drying chamber, T3 is the target temperature expected to be reached in the drying chamber, T4 is the difference between the target temperature and the real-time temperature of the drying chamber, and K3 is the temperature increment factor corresponding to the real-time temperature.

[0029] Further, according to the temperature change rate table and the real-time temperature, the temperature increment factor corresponding to the real-time temperature is obtained, including:

[0030] According to the target temperature and the predetermined increment, an estimated heating temperature of the heat pump assembly is obtained;

[0031] According to the temperature change rate table, the temperature change rate of the drying chamber from the real-time temperature to the target temperature when the heat pump assembly heats at the estimated heating temperature is selected;

[0032] According to the selected temperature change rate, an average temperature change rate thereof is obtained;

[0033] Comparing the maximum value in the selected temperature change rate with the average temperature change rate, the temperature increment factor corresponding to the real-time temperature is obtained.

[0034] In a second aspect, the present application also provides a high-efficiency quality-keeping grain variable-temperature drying method, which adopts the above-mentioned high-efficiency quality-keeping grain variable-temperature drying system, and the method includes:

[0035] placing the grain to be dried in the dryer;

[0036] detecting the real-time temperature and moisture content of the grain in the drying chamber through the detection assembly;

[0037] The control assembly adjusts the heating temperature of the heat pump assembly to the drying chamber according to the detected real-time temperature and moisture content of the grain in the drying chamber.

[0038] In a third aspect, the present application further provides a high-efficiency quality-preserved grain variable-temperature drying adjusting system, comprising:

[0039] The parameter acquisition module is configured to acquire the real-time temperature and moisture content detected by the temperature sensor and the moisture meter;

[0040] The processing and analysis module is configured to process and analyze the real-time moisture content to obtain the real-time maximum tolerance temperature of the grain, and obtain the target temperature according to the real-time maximum tolerance temperature;

[0041] The temperature adjusting module is configured to adjust the heating temperature of the heat pump assembly to the drying chamber based on the real-time temperature and the target temperature.

[0042] Further, the temperature adjusting module comprises:

[0043] The temperature change acquisition module is configured to acquire a temperature change rate table of the drying chamber at different temperatures when the heat pump assembly uses different temperatures for heating;

[0044] The increment factor determination module is configured to obtain a temperature increment factor corresponding to the real-time temperature according to the temperature change rate table and the real-time temperature;

[0045] The difference calculation module is configured to calculate a difference between the real-time temperature and the target temperature;

[0046] The heating temperature determination module is configured to obtain the heating temperature of the heat pump assembly to the drying chamber by processing the real-time temperature, the temperature increment factor, and the difference between the real-time temperature and the target temperature;

[0047] The heat pump adjusting module is configured to adjust the actual temperature output by the heat pump assembly according to the obtained heating temperature.

[0048] The present application provides a high-efficiency quality-preserved grain variable-temperature drying system and method, which at least has the following beneficial effects:

[0049] (1) The present application can realize the drying of grain through the dryer. Through the cooperation of the detection assembly and the control assembly, the temperature of the grain in the drying chamber can be adjusted in real time, so that the grain has a good drying temperature during drying.

[0050] (2) Through the real-time moisture content of the grain in the drying chamber, the corresponding real-time maximum tolerance temperature is obtained, and the best target temperature is given according to the real-time maximum tolerance temperature, so that the grain can be controlled at the drying temperature corresponding to the real-time moisture content, thereby the grain can be dried at a higher drying efficiency while ensuring that the quality of the grain is not affected during the drying process.

[0051] (3) According to the target temperature of the grain, the heating temperature of the heat pump assembly can be given, so that the temperature of the grain can quickly reach the best target temperature. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 A schematic diagram of a high-efficiency quality-preserving grain variable-temperature drying system provided by the present application;

[0053] Figure 2 A flowchart of controlling and adjusting the heating temperature of an embodiment provided by the present application;

[0054] Figure 3 A flowchart of adjusting the heating temperature of an embodiment provided by the present application;

[0055] Figure 4 A flowchart of obtaining a temperature increment factor of an embodiment provided by the present application;

[0056] Figure 5 A flowchart of a high-efficiency quality-preserving grain variable-temperature drying method provided by the present application. DETAILED DESCRIPTION

[0057] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings and specific embodiments in the specification. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0058] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Multiple" generally includes at least two.

[0059] It is also to be understood that the terminology "include", "includes" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a product or process that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such product or process. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the product or process that includes the stated element.

[0060] As shown in Figure 1 The present application provides a high-quality grain temperature change drying system, which comprises a drying machine, a detection assembly and a control assembly.

[0061] The drying machine comprises a drying chamber for accommodating grains and a heat pump assembly for heating the drying chamber.

[0062] The detection assembly comprises a temperature sensor and a moisture meter for detecting the temperature and moisture content of the grains in the drying chamber, respectively.

[0063] The control assembly controls the heating temperature of the heat pump assembly for the drying chamber according to the temperature and moisture content of the grains in the drying chamber.

[0064] When the heat pump assembly is used to heat the drying chamber, a corresponding heat pump assembly can be selected according to the specific structure of the drying chamber. In actual application scenarios, the heat pump assembly can include an air outlet unit and a heating unit. The air outlet unit inputs dry air into the drying chamber, and the heating unit heats the dry air input into the drying chamber by the air outlet unit. In order to improve the heating effect of the heat pump assembly on the drying chamber, the air outlet unit can be provided with a corresponding structure, for example, the air outlet unit is provided with a plurality of air outlets distributed at intervals along the inner wall of the drying chamber, and the plurality of air outlets are used to uniformly dry the grains in the drying chamber. While ensuring the drying effect, in order to reduce the energy loss when the heating unit heats, the heat recovered from the gas discharged after drying in the drying chamber can be used to heat the dry air through a heat exchanger or other structure, so as to heat the dry air and realize the recycling of heat and reduce energy loss.

[0065] The drying chamber of the drying machine is also provided with a stirring assembly and other structures, which are used to realize the functions required in the grain drying process. For example, the stirring assembly can stir the grains in the drying chamber to make them contact with the dry air heated by the heat pump assembly, thereby realizing uniform drying of the grains in the drying chamber.

[0066] In order to ensure the accuracy of the detection results, the setting mode of the detection assembly can be designed to reflect the temperature and moisture content of the whole grain in the drying chamber when the temperature and moisture content in the drying chamber are detected by the detection assembly. In the actual application scenario, the temperature sensor of the detection assembly can be uniformly provided with a plurality of temperature sensors along the length direction of the drying chamber, and the adjacent temperature sensors are arranged at equal intervals. The moisture meter can be uniformly provided with a plurality of moisture meters along the length direction of the drying chamber, and the adjacent moisture meters are arranged at equal intervals. The interval between the adjacent moisture meters in the embodiment is the same as the interval of the temperature sensor.

[0067] At the same drying temperature, when the moisture content of the grain is high, the water content in the wet air in the grain is large, and at this time, the heat of the wet air is strong (the enthalpy is high), which has a greater impact on the activity of the grain, and is easy to cause the germination rate to decrease; when the moisture content of the grain is low, the water content in the wet air in the grain is small, and at this time, the heat of the wet air is weak (the enthalpy is low), which has a smaller impact on the activity of the rice, and the impact on the germination rate of the rice is weakened. Therefore, the tolerance temperature of the rice, that is, the highest heating temperature at which the germination rate of the rice is not affected, will gradually increase as the moisture content decreases. Therefore, in the process of detecting the temperature and moisture content of the grain in real time, the control assembly controls the heat pump assembly to adjust the heating temperature of the drying chamber. Specifically, as shown in Figure 2 According to the temperature and moisture content of the grain in the drying chamber, the control and adjustment of the heating temperature of the drying chamber by the heat pump assembly can include:

[0068] obtaining the real-time temperature and moisture content detected by the temperature sensor and the moisture meter;

[0069] processing and analyzing the real-time moisture content to obtain the real-time maximum tolerance temperature of the grain;

[0070] obtaining the target temperature according to the real-time maximum tolerance temperature;

[0071] adjusting the heating temperature of the drying chamber by the heat pump assembly based on the real-time temperature and the target temperature.

[0072] Among them, the processing and analysis of the real-time moisture content to obtain the real-time maximum tolerance temperature of the grain can satisfy the following relationship:

[0073] ;

[0074] In the formula, t max is the real-time maximum tolerance temperature, M is the real-time moisture content, the unit is %, a, b, and c are constants.

[0075] In addition, each real-time maximum tolerance temperature has a target temperature, that is, the target temperature changes with the real-time maximum tolerance temperature. When the target temperature is obtained according to the real-time maximum tolerance temperature in this embodiment, the target temperature and the real-time maximum tolerance temperature satisfy the following relationship:

[0076] t max -t i =d

[0077] In the formula, t i is the target temperature at the ith moment corresponding to the real-time maximum tolerance temperature, and d is a constant.

[0078] In actual application scenarios, the difference between the real-time maximum tolerance temperature and the corresponding target temperature is equal to 1℃. Specifically, the real-time maximum tolerance temperature of the grain is compared with the real-time temperature of the grain detected by the temperature sensor. If the real-time maximum tolerance temperature and the detected real-time temperature are less than 1℃, the control component sends a cooling instruction to the heat pump component to reduce the heat output of the heat pump component and reduce the temperature of the output hot air, thereby reducing the real-time temperature of the grain and making the detected real-time temperature below the real-time maximum tolerance temperature. If the real-time maximum tolerance temperature and the detected real-time temperature are greater than 1℃, the control component sends a heating instruction to the heat pump component to increase the heat output of the heat pump component and increase the temperature of the output hot air, thereby increasing the real-time temperature of the grain.

[0079] According to the above relationship, the tolerance temperature of the grain at different moisture contents can be obtained in this embodiment. Taking rice as an example, a lower hot air temperature is used for drying in the initial stage when the moisture content of the rice is relatively high. As the drying proceeds, the hot air temperature is gradually increased after the moisture content of the rice is reduced, and the temperature of the rice is always maintained close to but not exceeding the tolerance temperature of the rice at the moisture content. In this way, the germination rate of the rice can be maintained, that is, the quality of the rice is not affected, and at the same time, the drying efficiency of the rice can be improved.

[0080] As Figure 3 shown, after obtaining the target temperature in the current state through the real-time maximum tolerance temperature, the heat pump component can adjust the heating temperature of the drying chamber based on the real-time temperature and the target temperature. Specifically, it can include:

[0081] obtaining a temperature change rate table of the drying chamber at different temperatures when the heat pump component uses different temperatures for heating;

[0082] obtaining a temperature increment factor corresponding to the real-time temperature according to the temperature change rate table and the real-time temperature;

[0083] calculating the difference between the real-time temperature and the target temperature;

[0084] The heating temperature of the drying chamber by the heat pump component is obtained by processing the real-time temperature, the temperature increment factor, and the difference between the real-time temperature and the target temperature.

[0085] Adjust the actual output temperature of the heat pump component based on the obtained heating temperature.

[0086] Among them, such as Figure 4 As shown, based on the temperature change rate table and the real-time temperature, the temperature increment factor corresponding to the real-time temperature can be obtained, which may include:

[0087] Based on the target temperature and the predetermined increment, the estimated heating temperature of the heat pump component is obtained;

[0088] Based on the temperature change rate table, select the temperature change rate of the drying chamber from the real-time temperature to the target temperature when the heat pump component is heated to the estimated heating temperature.

[0089] The average temperature change rate is obtained based on the selected temperature change rate.

[0090] The maximum value among the selected temperature change rates is compared with the average temperature change rate to obtain the temperature increment factor corresponding to the real-time temperature.

[0091] The predetermined increment is a preset value, which is added to the target temperature to obtain the estimated heating temperature of the heat pump component. The estimated heating temperature of the heat pump component represents the theoretical estimated value of the heat pump component for heating the drying chamber.

[0092] Specifically, the maximum value among the selected temperature change rates is compared with the average temperature change rate to obtain the temperature increment factor corresponding to the real-time temperature, including:

[0093] The ratio of the maximum value to the average temperature change rate among the selected temperature change rates is used as the temperature increment factor corresponding to the real-time temperature, specifically:

[0094] K3=ΔT max / ΔT

[0095] In the formula, K3 is the temperature increment factor corresponding to the real-time temperature, and ΔT max ΔT represents the maximum rate of temperature change, while ΔT represents the average rate of temperature change.

[0096] In this embodiment, the heating temperature is adjusted based on the real-time temperature, the temperature increment factor, and the resulting temperature difference. Specifically, when the temperature difference is large, the heat pump component provides a higher heating temperature to accelerate the drying process; when the temperature difference is small, the heat pump component provides a lower heating temperature to maintain a stable drying temperature.

[0097] The heating temperature of the heat pump assembly to the drying chamber is obtained based on real-time temperature, temperature increment factor and difference between real-time temperature and target temperature, and can satisfy the following relationship:

[0098] ;

[0099] In the formula, T2' is the heating temperature of the heat pump assembly to the drying chamber, T3 is the target temperature expected to be reached in the drying chamber, T4 is the difference between the target temperature and the real-time temperature of the drying chamber, and K3 is the temperature increment factor corresponding to the real-time temperature.

[0100] The detection assembly can realize real-time sensing of the grain state, and the control assembly can realize real-time adjustment of the working state of the heat pump assembly, so that the drying efficiency is maximized and the grain quality is ensured.

[0101] As shown in Figure 5 The application further provides a high-efficiency quality-ensuring grain variable-temperature drying method, which adopts the high-efficiency quality-ensuring grain variable-temperature drying system, and the method comprises the following steps:

[0102] S1, placing the grain to be dried in a drying machine;

[0103] S3, detecting the real-time temperature and moisture content of the grain in the drying chamber by the detection assembly;

[0104] S5, adjusting the heating temperature of the heat pump assembly to the drying chamber by the control assembly based on the detected real-time temperature and moisture content of the grain in the drying chamber.

[0105] In step S5, the heating temperature of the heat pump assembly to the drying chamber is adjusted based on the detected real-time temperature and moisture content of the grain in the drying chamber, and specifically comprises the following steps:

[0106] S51, obtaining the real-time temperature and moisture content detected by the temperature sensor and the moisture meter;

[0107] S53, processing and analyzing the real-time moisture content to obtain the real-time maximum tolerance temperature of the grain;

[0108] S55, obtaining the target temperature based on the real-time maximum tolerance temperature;

[0109] S57, adjusting the heating temperature of the heat pump assembly to the drying chamber based on the real-time temperature and the target temperature.

[0110] In step S53, the real-time maximum tolerance temperature of the grain is obtained by processing and analyzing the real-time moisture content, and can satisfy the following relationship:

[0111] ;

[0112] In the formula, t maxM is the real-time moisture content, a, b, c are constants.

[0113] In addition, each real-time maximum tolerance temperature has a target temperature, and the target temperature changes with the change of the real-time maximum tolerance temperature. In step S55 of the embodiment, when the target temperature is obtained according to the real-time maximum tolerance temperature, the target temperature and the real-time maximum tolerance temperature satisfy the following relationship:

[0114] t max -t i =d

[0115] In the formula, t i is the target temperature at the ith moment corresponding to the real-time maximum tolerance temperature, d represents a target adjustment difference, which is a constant, and 0 < d ≤ 3℃.

[0116] Therefore, after obtaining the real-time maximum tolerance temperature and determining the target adjustment difference, the temperature adjustment of the grain can include:

[0117] The real-time maximum tolerance temperature of the grain is compared with the real-time temperature of the grain detected by the temperature sensor. If the real-time maximum tolerance temperature and the detected real-time temperature are less than the target adjustment difference, the control component sends a cooling instruction to the heat pump component to reduce the heat output of the heat pump component and reduce the temperature of the output hot air, thereby reducing the real-time temperature of the grain, so that the detected real-time temperature is below the real-time maximum tolerance temperature and the temperature difference between the real-time temperature and the real-time maximum tolerance temperature approaches or equals the target adjustment difference. If the real-time maximum tolerance temperature and the detected real-time temperature are greater than the target adjustment difference, the control component sends a heating instruction to the heat pump component to increase the heat output of the heat pump component and increase the temperature of the output hot air, thereby increasing the real-time temperature of the grain, so that the temperature difference between the real-time temperature and the real-time maximum tolerance temperature approaches or equals the target adjustment difference.

[0118] In actual application scenarios, the difference between the real-time maximum tolerance temperature and the corresponding target temperature is equal to 1℃. Therefore, the temperature adjustment of the grain can include: comparing the real-time maximum tolerance temperature of the grain with the real-time temperature of the grain detected by the temperature sensor. If the real-time maximum tolerance temperature and the detected real-time temperature are less than 1℃, the control component sends a cooling instruction to the heat pump component to reduce the heat output of the heat pump component; if the real-time maximum tolerance temperature and the detected real-time temperature are greater than 1℃, the control component sends a heating instruction to the heat pump component to increase the heat output of the heat pump component.

[0119] According to the above relationship, the tolerance temperature of the grain at different moisture contents can be obtained. Taking rice as an example, in the initial stage of high moisture content of rice, lower hot air temperature is used for drying; as the drying proceeds, the moisture content of rice is reduced, and the hot air temperature is gradually increased, and the temperature of rice is always close to but not higher than the tolerance temperature of rice at the moisture content. In this way, the germination rate of rice can be maintained, that is, the quality of rice is not affected, and the drying efficiency of rice can be improved.

[0120] After obtaining the target temperature in the current state by the real-time maximum tolerance temperature in the embodiment, step S57 can adjust the heating temperature of the drying chamber by the heat pump assembly based on the real-time temperature and the target temperature, which can specifically include:

[0121] S571, obtaining a temperature change rate table of the drying chamber at different temperatures when the heat pump assembly is heated at different temperatures;

[0122] S573, obtaining a temperature increment factor corresponding to the real-time temperature according to the temperature change rate table and the real-time temperature;

[0123] S575, calculating the difference between the real-time temperature and the target temperature;

[0124] S577, processing based on the real-time temperature, the temperature increment factor, and the difference between the real-time temperature and the target temperature to obtain the heating temperature of the drying chamber by the heat pump assembly;

[0125] S579, adjusting the actual temperature output by the heat pump assembly according to the obtained heating temperature.

[0126] The temperature adjustment of the grain can be realized by step S57.

[0127] In step S573, obtaining a temperature increment factor corresponding to the real-time temperature according to the temperature change rate table and the real-time temperature can include:

[0128] S5731, obtaining a predicted heating temperature of the heat pump assembly according to the target temperature and a predetermined increment;

[0129] S5733, selecting a temperature change rate in the process of heating the drying chamber from the real-time temperature to the target temperature when the heat pump assembly is heated at the predicted heating temperature according to the temperature change rate table;

[0130] S5735, obtaining an average temperature change rate according to the selected temperature change rate;

[0131] S5737, comparing the maximum value in the selected temperature change rate with the average temperature change rate to obtain a temperature increment factor corresponding to the real-time temperature.

[0132] Specifically, the maximum value in the selected temperature change rate is compared with the average temperature change rate to obtain a temperature increment factor corresponding to the real-time temperature, including:

[0133] K3=ΔT max / ΔT

[0134] In the formula, K3 is a temperature increment factor corresponding to the real-time temperature, ΔT max is the maximum value in the temperature change rate, and ΔT is the average temperature change rate.

[0135] The heating temperature of the embodiment is adjusted based on the real-time temperature and the temperature increment factor, and the obtained temperature difference. The meaning of step S57 adjusting the heating temperature of the drying chamber by the heat pump assembly is that when the temperature difference is large, the heat pump assembly will provide a higher heating temperature to speed up the drying process; when the temperature difference is small, the heat pump assembly will provide a lower heating temperature to maintain a stable drying temperature.

[0136] In step S577, based on the real-time temperature, the temperature increment factor, and the difference between the real-time temperature and the target temperature, the heating temperature of the drying chamber by the heat pump assembly is obtained, which can satisfy the following relationship:

[0137]

[0138] In the formula, T2' is the heating temperature of the drying chamber by the heat pump assembly, T3 is the target temperature expected to be reached in the drying chamber, T4 is the difference between the target temperature and the real-time temperature of the drying chamber, and K3 is the temperature increment factor corresponding to the real-time temperature.

[0139] According to the real-time sensing of the detection assembly on the grain state, and the real-time adjustment of the working state of the heat pump assembly by the control assembly, the drying efficiency is maximized, and the grain quality is guaranteed.

[0140] The application also provides a high-efficiency quality-keeping grain variable-temperature drying adjustment system, which can include:

[0141] The parameter acquisition module is configured to acquire the real-time temperature and moisture content detected by the temperature sensor and the moisture meter.

[0142] The processing and analysis module is configured to process and analyze the real-time moisture content to obtain the real-time maximum tolerance temperature of the grain, and obtain the target temperature according to the real-time maximum tolerance temperature.

[0143] The temperature adjustment module is configured to adjust the heating temperature of the drying chamber by the heat pump assembly based on the real-time temperature and the target temperature.

[0144] The temperature adjustment module includes:

[0145] ​a temperature change acquisition module, configured to acquire a temperature change rate table of the drying chamber at different temperatures when the heat pump assembly is heated at different temperatures;

[0146] an increment factor determination module, configured to obtain a temperature increment factor corresponding to the real-time temperature according to the temperature change rate table and the real-time temperature;

[0147] a difference calculation module, configured to calculate a difference between the real-time temperature and the target temperature;

[0148] a heating temperature determination module, configured to obtain a heating temperature of the heat pump assembly to the drying chamber based on processing of the real-time temperature, the temperature increment factor and the difference between the real-time temperature and the target temperature;

[0149] a heat pump adjustment module, configured to adjust an actual temperature output by the heat pump assembly according to the obtained heating temperature.

[0150] Although the preferred embodiments of the present application have been described, those skilled in the art who understand the inventive concept can make additional changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application. Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A high efficiency quality preserving grain variable temperature drying system, characterized in that, The dryer, the detection assembly and the control assembly are included. The dryer includes a drying chamber for accommodating the grains and a heat pump assembly for heating the drying chamber. The detection assembly includes a temperature sensor and a moisture meter for detecting the temperature and the moisture content of the grains in the drying chamber, respectively. The control assembly controls the heating temperature of the heat pump assembly for the drying chamber according to the temperature and the moisture content of the grains in the drying chamber, including: obtaining the real-time temperature and the real-time moisture content detected by the temperature sensor and the moisture meter; processing and analyzing the real-time moisture content to obtain the real-time maximum tolerance temperature of the grains, which satisfies the following relationship: ； In the formula, t max is the real-time maximum tolerance temperature, M is the real-time moisture content, a, b, c are constants; the tolerance temperature of the cereal, i.e. the highest temperature of heating at which the germination rate of the cereal is not affected, gradually increases as the moisture content decreases; obtaining the target temperature according to the real-time maximum tolerance temperature; based on the real-time temperature and the target temperature, adjusting the heating temperature of the heat pump assembly for the drying chamber, including: obtaining a temperature change rate table of the drying chamber at different temperatures when the heat pump assembly is heated at different temperatures; obtaining a temperature increment factor corresponding to the real-time temperature according to the temperature change rate table and the real-time temperature, including: obtaining an estimated heating temperature of the heat pump assembly according to the target temperature and a predetermined increment; selecting a temperature change rate of the drying chamber from the real-time temperature to the target temperature when the heat pump assembly is heated at the estimated heating temperature according to the temperature change rate table; obtaining an average temperature change rate of the selected temperature change rate; comparing the maximum value of the selected temperature change rate with the average temperature change rate to obtain the temperature increment factor corresponding to the real-time temperature; calculating the difference between the real-time temperature and the target temperature; based on the real-time temperature, the temperature increment factor and the difference between the real-time temperature and the target temperature, obtaining the heating temperature of the heat pump assembly for the drying chamber, which satisfies the following relationship: ； wherein T2' is the heating temperature of the heat pump assembly for the drying chamber, T3 is the target temperature expected to be reached in the drying chamber, T4 is the difference between the target temperature and the real-time temperature of the drying chamber, and K3 is the temperature increment factor corresponding to the real-time temperature; adjusting the actual temperature output by the heat pump assembly according to the obtained heating temperature.

2. The system for variable temperature drying of grain of claim 1, wherein, The heat pump assembly includes an air outlet unit and a heating unit, the air outlet unit inputs dry air into the drying chamber, and the heating unit heats the dry air input into the drying chamber by the air outlet unit.

3. The system for variable temperature drying of grain of claim 1, wherein, The temperature sensor is uniformly provided with a plurality of temperature sensors along the length direction of the drying chamber, and the adjacent temperature sensors are arranged at equal intervals, and the moisture meter is uniformly provided with a plurality of moisture meters along the length direction of the drying chamber, and the adjacent moisture meters are arranged at equal intervals.

4. A high-quality grain variable-temperature drying method using the high-quality grain variable-temperature drying system according to any one of claims 1 to 3, characterized in that, The method includes: placing the grains to be dried in the dryer; detecting the real-time temperature and the moisture content of the grains in the drying chamber by the detection assembly; adjusting the heating temperature of the heat pump assembly for the drying chamber by the control assembly according to the detected real-time temperature and the moisture content of the grains in the drying chamber.

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