Drying tower

Abstract

The utility model belongs to the technical field of drying devices. The drying tower is characterized by comprising different temperature zone drying sections which are arranged from top to bottom; each temperature zone drying section comprises a drying chamber, an air outlet duct, a dust removal mechanism, an air energy heat pump and an air heater; the air outlet duct is arranged on the drying chamber; an air inlet of the dust removal mechanism is communicated with the air outlet duct, an air outlet of the dust removal mechanism is connected with an air inlet of the heat pump, and an air outlet of the heat pump is connected with the drying chamber through the air heater; partition plates are arranged between the air outlet channels of the drying sections of the different temperature areas and used for separating the different temperature areas. The drying tower is used for solving the technical problems that the drying temperature of an existing drying tower is single, the requirements of materials with different heights in the drying tower for the drying temperature are not matched, and energy consumption is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of drying devices, and in particular relates to a continuous drying tower. Background Art

[0002] The continuous drying tower is an outdoor drying equipment used to reduce the moisture content of raw grains. It usually requires a supporting heat source to generate clean hot air. The hot air fully contacts the grains, takes away the moisture from the grains, and brings the moisture content of the grains to a safe storage level.

[0003] The traditional continuous drying tower is equipped with a coal-fired hot air furnace or a biomass hot air furnace, and the exhaust gas generated is harmful to the environment and is not environmentally friendly. Moreover, the humid air generated by the drying tower is directly discharged into the atmosphere, which also causes energy waste. At present, the heat source configuration of the domestic drying tower has gradually eliminated the coal-fired furnace, but is still limited to the biomass hot air furnace. The environmental protection issue is urgent and the waste heat recovery of the heat source and the tower is very small. Although the basic function of grain drying can be achieved, the energy consumption cost is relatively high. Considering that the existing technology can also configure the air energy heat pump for use in the drying tower, but has not been able to use its advantages in many aspects, such as the waste heat recovery of the drying tower, the exhaust gas dust removal, and the variable temperature control of the hot air temperature.

[0004] In summary, the existing drying towers have the following technical problems: First, some drying towers that use heat pumps do not achieve temperature zoning and cannot achieve constant temperature drying with different gradients. Second, when the air energy heat pump is configured with a continuous drying tower solution, the waste heat of the drying tower cannot be effectively utilized. Third, when the continuous drying tower uses pulse dust removal, the heat pump system cannot be closed-loop. Utility Model Content

[0005] The utility model aims to provide a drying tower to solve the technical problems that the existing drying tower has a single drying temperature, does not match the drying temperature requirements of materials at different heights in the drying tower, and has high energy consumption.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a drying tower, characterized in that it comprises drying sections with different temperature zones arranged from top to bottom;

[0007] Each of the temperature zone drying sections comprises a drying chamber, an air outlet, a dust removal mechanism, an air energy heat pump, and a hot air blower; the air outlet is arranged on the drying chamber; the air inlet of the dust removal mechanism is connected to the air outlet, the air outlet of the dust removal mechanism is connected to the air inlet of the heat pump, and the air outlet of the heat pump is connected to the drying chamber via the hot air blower;

[0008] A partition is arranged between the air outlet ducts of the drying sections in different temperature zones to separate the different temperature zones.

[0009] The utility model designs a continuous drying tower as drying sections with different temperature zones arranged from top to bottom. Each drying section is equipped with a heat pump to realize temperature zoning and achieve three relative temperatures of high, medium and low. During the entire drying process, the temperature and moisture are accurately controlled to ensure the quality of the grain.

[0010] This utility model is upgraded on the basis of the original process, adding a waste heat recovery device of the drying tower, namely a dust removal mechanism and an air energy heat pump, and adopts clean and environmentally friendly air energy as the heat source of the drying tower, which perfectly solves the customer's problem of meeting environmental protection standards and reducing energy consumption.

[0011] The utility model makes full use of the waste heat of the drying tower and passes the waste heat to the air inlet of the heat pump, which reduces the power of the air energy heat pump and greatly improves the efficiency and application range of the heat pump, thus overcoming the low efficiency of the heat pump in a low temperature environment.

[0012] The utility model utilizes a dust removal mechanism, has high exhaust gas dust removal efficiency, effectively reduces dust, and provides clean hot air for the air energy heat pump, ensuring that the heat pump operates well.

[0013] In order to solve the technical problem of how to realize the temperature drying section, the utility model adopts the following technical solution, and the temperature drying section includes:

[0014] First temperature zone drying section;

[0015] A second temperature zone drying section is arranged below the first temperature zone drying section;

[0016] The third temperature zone drying section is arranged below the second temperature zone drying section;

[0017] The drying temperatures of the first temperature zone drying section, the second temperature zone drying section, and the third temperature zone drying section are gradually reduced.

[0018] The utility model is used to dry corn with high moisture content. When feeding, the moisture content in the upper part of the drying tower is the highest. The first temperature zone drying section, i.e., the first temperature zone drying section, uses a temperature of 90-100°C for rapid precipitation and drying. As the moisture content decreases, the second temperature zone drying section, i.e., the second temperature zone drying section, uses a temperature of 80-90°C for drying; the third temperature zone drying section, i.e., the third temperature zone drying section, uses a temperature of 70-80°C for drying. The purpose of this is to rapidly precipitate moisture while ensuring the quality of the corn according to the precipitation characteristics of the corn. For example, when drying seeds, the drying temperature is relatively low, and the temperatures of the three heat pumps can be controlled at about 45°C for constant temperature drying. At this time, the actual load of the heat pump is small, and the internal compressor can automatically shut down several units according to the temperature requirements. The purpose of this is energy-saving and efficient, and no heat source is wasted.

[0019] In order to solve the technical problem of how to realize the air energy heat pump, the utility model adopts the following technical solution, and the air energy heat pump includes:

[0020] A total heat exchanger, wherein a heat pump air inlet and a fresh air inlet are arranged on the total heat exchanger; the heat pump air inlet is connected to the air outlet of the dust removal mechanism; the fresh air inlet is used to introduce fresh air into the air energy heat pump; the total heat exchanger is used to preheat the fresh air by utilizing the waste heat of the drying section in the temperature zone;

[0021] A condenser connected to the total heat exchanger, a heat pump air outlet is arranged on the condenser, and the condenser is used to heat the fresh air;

[0022] The evaporator is connected to the total heat exchanger, and the evaporator is used to absorb the residual heat after heat exchange through the total heat exchanger and then discharge the exhaust gas.

[0023] The waste heat air enters the heat pump of each temperature zone drying section, and enters the heat pump from the heat pump air inlet through the pipeline. At the same time, the heat pump introduces fresh air from the fresh air inlet. Under the heat exchange of the full heat exchanger inside the heat pump, the fresh air is preheated. The preheated fresh air enters the condenser and realizes the function of heating the fresh air again. The dry and warm low-temperature hot air produced in this way passes through the heat pump outlet and is connected to the air inlet of the hot air blower of the temperature zone drying section. After the original waste heat is exchanged, it enters the heat pump evaporator, further absorbs heat, and then is discharged into the air through the heat pump. The waste heat of the temperature zone drying section first heats the fresh air through preheating, and then absorbs heat, realizing the full utilization of waste heat.

[0024] In order to solve the technical problem of low dust removal efficiency of the dust removal mechanism, in each temperature zone drying section, a first air outlet duct and a second air outlet duct are respectively arranged on both sides of the drying chamber; a first dust removal mechanism is arranged on the first air outlet duct; a second dust removal mechanism is arranged on the second air outlet duct; the first dust removal mechanism and the second dust removal mechanism are both connected to the air energy heat pump;

[0025] The drying chamber of each temperature zone drying section is provided with a hot air inlet, and the hot air inlet is arranged on the side plate of the drying chamber between the corresponding air outlets. The two air outlets are dusted by two dust removal mechanisms, thereby improving the dust removal efficiency and the waste heat supply efficiency.

[0026] In order to solve the technical problem of low dust removal efficiency of the dust removal mechanism, the utility model adopts the following technical solution: the dust removal mechanism is a pulse dust collector, and an air shutoff is provided on the pulse dust collector to discharge the dust, impurities and particles collected by the pulse dust collector. The utility model uses a pulse dust collector, and the tail gas dust removal efficiency reaches more than 90%, which effectively reduces dust while providing clean hot air for the air energy heat pump to ensure the good working condition of the heat pump.

[0027] In order to solve the technical problem of interference between hot air entering and exiting the drying chamber, the utility model adopts the following technical solution: a hot air inlet is arranged on the drying chamber of each temperature zone drying section, and the hot air inlet is arranged on the side plate of the drying chamber between the corresponding air outlets. The hot air inlet and the air outlet do not interfere with each other, and the layout is reasonable.

[0028] In order to solve the technical problem of low drying efficiency of the drying tower, the utility model adopts the following technical solution: the drying tower adopts a double grain column structure; a ventilation angle box is arranged in the drying chamber. The interior of the drying tower is composed of a ventilation angle box structure, hot air enters the angle box from the air inlet, and the grain flows downward in an S shape inside the angle box. The drying tower adopts forward and reverse flow drying, and the drying efficiency is high.

[0029] In order to solve the technical problem of cooling the material after drying, the utility model adopts the following technical solution: the drying tower also includes a cooling section, which is arranged below the drying section in the lowest temperature zone to cool the grain to reach the temperature required for grain output.

[0030] In order to solve the technical problem of how cold air enters the cooling section, the utility model adopts the following technical solution: a cold air inlet is arranged on the cooling section, and the cold air inlet is connected to the cold air machine via a pipeline. The cold air enters the air duct from the cold air inlet to cool the grain to the required temperature for grain output.

[0031] In order to solve the technical problem of material supply in a drying tower, the utility model adopts the following technical solution: the drying tower also includes a feeding device for conveying materials to the drying tower.

[0032] In order to solve the technical problem of how to realize the feeding device, the utility model adopts the following technical solution, wherein the feeding device is a bucket elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of a drying tower of the utility model;

[0034] Figure 2 It is a schematic diagram of a drying tower of the utility model;

[0035] Figure 3 It is a schematic diagram of a drying tower of the utility model;

[0036] Figure 4 It is a schematic diagram of the dust removal mechanism of the drying tower of the utility model;

[0037] Figure 5 It is a schematic diagram of the air energy heat pump of the drying tower of the utility model;

[0038] Reference numerals:

[0039] 1 is the food inlet, 2 is the first air duct, 3 is the second air duct, 4 is the hot air inlet of the first temperature zone drying section, 5 is the hot air inlet of the second temperature zone drying section, 6 is the hot air inlet of the third temperature zone drying section, 7 is the cold air inlet, 8 is the waste air outlet of the first temperature zone drying section, 9 is the waste air outlet of the second temperature zone drying section, 10 is the waste air outlet of the third temperature zone drying section, 11 is the feeding device, 12 is the air inlet duct of the first temperature zone drying section, 13 is the air inlet duct of the second temperature zone drying section, 14 is the air inlet duct of the third temperature zone drying section, 15 is the air outlet duct of the first temperature zone drying section, 16 is the air outlet duct of the second temperature zone drying section, 17 is the air outlet duct of the third temperature zone drying section, 18 is the hot air blower of the first temperature zone drying section, 19 is a hot air blower for the second temperature zone drying section, 20 is a hot air blower for the third temperature zone drying section, 21 is a pulse dust collector for the first temperature zone drying section, 22 is a pulse dust collector for the second temperature zone drying section, 23 is a pulse dust collector for the third temperature zone drying section, 24 is a heat pump for the first temperature zone drying section, 25 is a heat pump for the second temperature zone drying section, 26 is a heat pump for the third temperature zone drying section, 27 is an air outlet for the pulse dust collector, 28 is an air inlet for the pulse dust collector, 29 is an air shut-off device, 30 is an air inlet for the heat pump, 31 is an air outlet for the heat pump, 32 is a fresh air inlet, 33 is a cold air blower, 34 is a drying section for the first temperature zone, 35 is a drying section for the second temperature zone, 36 is a drying section for the third temperature zone, 37 is a cooling section, and 38 is a partition. DETAILED DESCRIPTION

[0040] The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0041] Example 1

[0042] like Figure 1-5 As shown, the continuous drying tower includes different temperature zone drying sections arranged from top to bottom. In one embodiment, the temperature drying section includes a first temperature zone drying section 34, a second temperature zone drying section 35, and a third temperature zone drying section 36. The second temperature zone drying section is located below the first temperature zone drying section; the third temperature zone drying section is located below the second temperature zone drying section. The first temperature zone drying section is a high temperature zone. The second temperature zone drying section is a medium temperature zone. The third temperature zone drying section is a low temperature zone.

[0043] The first, second and third temperature zone drying sections all include drying chambers, dust removal mechanisms, air energy heat pumps and hot air blowers.

[0044] An air outlet is provided on the drying chamber of each temperature zone drying section. A partition 38 is provided between the air outlets of the drying sections of different temperature zones to separate the different temperature zones. In one embodiment, a hot air inlet is provided on the drying chamber of each temperature zone drying section, and the hot air inlet is provided on the side panel of the drying chamber between the corresponding air outlets.

[0045] The air inlet of the dust removal mechanism is connected to the air outlet. In one embodiment, a first air outlet 2 and a second air outlet 3 are respectively arranged on both sides of the drying chamber; the first air outlet 2 is connected to the air inlet of the first dust removal mechanism via a pipeline; the second air outlet 3 is connected to the air inlet of the second dust removal mechanism via a pipeline; the first dust removal mechanism and the air outlet of the first dust removal mechanism are both connected to the hot air inlet of the air energy heat pump.

[0046] In one embodiment, the dust removal mechanism is a pulse dust collector, and an air shutoff device is provided on the pulse dust collector to discharge dust, impurities, and particles collected by the pulse dust collector.

[0047] The air inlet of the air energy heat pump is connected to the air outlet of the dust removal mechanism, and the air outlet of the air energy heat pump is connected to the drying chamber via a hot air blower.

[0048] In one embodiment, the air energy heat pump includes a total heat exchanger, a condenser, and an evaporator.

[0049] The heat exchanger is provided with a heat pump air inlet and a fresh air inlet; the heat pump air inlet is connected to the air outlet of the dust removal mechanism; the fresh air inlet is used to introduce fresh air into the air energy heat pump; the heat exchanger is used to preheat the fresh air by utilizing the waste heat of the drying section in the temperature zone.

[0050] The condenser is connected to the total heat exchanger, and a heat pump outlet is arranged on the condenser. The condenser is used to heat the fresh air;

[0051] The evaporator is connected to the total heat exchanger, and the evaporator is used to absorb the residual heat after the heat exchange through the total heat exchanger and then discharge the exhaust gas.

[0052] In one embodiment, the drying tower adopts a double grain column structure; a ventilation angle box is arranged in the drying chamber.

[0053] In one embodiment, the drying tower further includes a cooling section 37, which is disposed below the drying section in the lowest temperature zone.

[0054] In one embodiment, a cold air inlet is provided on the cooling section 37 , and the cold air inlet is connected to the cold air fan 33 via a pipeline.

[0055] In one embodiment, the drying tower further comprises a feeding device 1 for conveying materials to the drying tower. The feeding device is preferably a bucket elevator.

[0056] The interior of the drying tower is composed of a ventilation angle box structure. Hot air enters the angle box from air inlets 4, 5, and 6, and the grain flows downward in an S shape inside the angle box. The drying tower adopts forward and reverse flow drying. Cold air enters the air duct from the cold air inlet 7 to cool the grain to the temperature required for grain output.

[0057] The continuous drying tower is a square steel plate frame structure with each layer relatively independent. The drying tower adopts a double grain column structure with air inlet in the middle and air outlet on both sides. Hot air enters the drying tower from the hot air inlet 4 of the first temperature zone drying section, the hot air inlet 5 of the second temperature zone drying section, and the hot air inlet 6 of the third temperature zone drying section. Partitions are set in the middle of the air outlet on both sides to ensure that the three temperature zones and the high temperature, medium temperature and low temperature do not interfere with each other, thus realizing the circulation of the hot air circuit.

[0058] After the hot air contacts the grain, the waste air and dust pass through the first air duct 2 and the second air duct 3, and enter the first temperature zone drying section pulse dust collector 21 through the first temperature zone drying section waste air outlet 8 and the first temperature zone drying section outlet duct 15. The dust enters through the pulse air inlet 28, and after being filtered by the pulse bag, the clean waste heat air is discharged from the pulse air outlet 27 and connected to the heat pump air inlet through the pipeline. After the dust passes through the pulse dust removal, the dust impurity particles are discharged and collected through the air lock 29.

[0059] After the hot air contacts the grain, the waste air and dust pass through the first air duct 2 and the second air duct 3, and enter the pulse dust collector 22 of the second temperature zone drying section through the waste air outlet 9 of the second temperature zone drying section and the first temperature zone drying section outlet duct 16. The dust enters through the pulse air inlet 28, and after being filtered by the pulse bag, the clean waste heat air is discharged from the pulse air outlet 27 and connected to the heat pump air inlet through the pipeline. After the dust passes through the pulse dust removal, the dust impurity particles are discharged and collected through the air lock 29.

[0060] After the hot air contacts the grain, the waste air and dust pass through the first air duct 2 and the second air duct 3, and enter the first temperature zone drying section pulse dust collector 23 through the third temperature zone drying section waste air outlet 10 and the first temperature zone drying section outlet duct 17. The dust enters through the pulse air inlet 28, and after being filtered by the pulse bag, the clean waste heat air is discharged from the pulse air outlet 27 and connected to the heat pump air inlet through the pipeline. After the dust passes through the pulse dust removal, the dust impurity particles are discharged and collected through the air lock 29.

[0061] The waste heat air enters the heat pump 24 of the first temperature zone drying section, and enters the heat pump through the pipeline from the heat pump air inlet 30. At the same time, the heat pump introduces fresh air from the fresh air inlet 32. Under the heat exchange of the full heat exchanger inside the heat pump, the fresh air is preheated. The preheated fresh air enters the condenser, and the function of heating the fresh air is realized again. The dry and hot high-temperature hot air produced in this way passes through the heat pump outlet 31 and is connected to the air inlet of the first temperature zone drying section hot air blower 18. After the original waste heat is exchanged, it enters the heat pump evaporator, further absorbs heat, and then is discharged into the air through the heat pump. The waste heat of the first temperature zone drying section first heats the fresh air through preheating, and then absorbs heat, thereby realizing the full utilization of the waste heat. The utility model first performs full heat exchange and then recovers heat through the evaporator, thereby improving the waste heat recovery efficiency.

[0062] The waste heat air enters the heat pump 25 of the second temperature zone drying section, and enters the heat pump through the pipeline from the heat pump air inlet 30. At the same time, the heat pump introduces fresh air from the fresh air inlet 32. Under the heat exchange of the total heat exchanger inside the heat pump, the fresh air is preheated. The preheated fresh air enters the condenser, and the function of heating the fresh air is realized again. The dry and warm medium-temperature hot air produced in this way passes through the heat pump air outlet 31 and is connected to the air inlet of the second temperature zone drying section hot air blower 19. After the original waste heat is exchanged, it enters the heat pump evaporator, further absorbs heat, and then is discharged into the air through the heat pump. The waste heat in the second temperature zone drying section first heats the fresh air through preheating, and then absorbs heat, realizing the full utilization of the waste heat.

[0063] The waste heat air enters the heat pump 26 of the third temperature zone drying section, and enters the heat pump through the heat pump air inlet 30 through the pipeline. At the same time, the heat pump introduces fresh air from the fresh air inlet 32. Under the heat exchange of the total heat exchanger inside the heat pump, the fresh air is preheated. The preheated fresh air enters the condenser and realizes the function of heating the fresh air again. The dry and warm low-temperature hot air produced in this way passes through the heat pump air outlet 31 and is connected to the air inlet of the third temperature zone drying section hot air blower 20. After the original waste heat is exchanged, it enters the heat pump evaporator, further absorbs heat, and then is discharged into the air through the heat pump. The waste heat in the third temperature zone drying section first heats the fresh air through preheating, and then absorbs heat, realizing the full utilization of the waste heat.

[0064] The first temperature zone drying section hot air fan 18 sends the hot air to the high-temperature hot air inlet 4 of the drying tower through the first temperature zone drying section air inlet duct 12, the second temperature zone drying section hot air fan 19 sends the hot air to the medium-temperature hot air inlet 5 of the drying tower through the second temperature zone drying section air inlet duct 13, and the third temperature zone drying section hot air fan 20 sends the hot air to the low-temperature hot air inlet 6 of the drying tower through the third temperature zone drying section air inlet duct 14. The system thus forms a closed loop of hot air, which recovers waste heat while collecting dust through pulses, thereby meeting environmental protection requirements.

[0065] The working process of the drying tower of the utility model is as follows: the raw grain is lifted to the top of the drying tower by the bucket elevator 11 and enters the drying tower through the grain inlet 1, and the grain slowly descends from top to bottom inside the drying tower. The drying tower is provided with 3 hot air inlets and 1 cold air inlet. The hot air enters the drying tower from the hot air inlet 4 of the first temperature zone drying section, the hot air inlet 5 of the second temperature zone drying section, and the hot air inlet 6 of the third temperature zone drying section. The first air duct 2 and the second air duct 3 are on both sides. The hot air fully contacts the grain, takes away the moisture of the grain, and gradually reduces the moisture of the grain until it reaches a safe moisture content.

[0066] The utility model is a heat pump with waste heat recovery continuous drying tower, which includes: a grain feeding bucket elevator, a continuous drying tower, three hot air blowers, a cold air blower, three pulse dust collectors, three air energy heat pumps and several inlet and outlet air ducts. In the loop composed of the continuous drying tower, the hot air blower, the pulse dust collector and the air energy heat pump, the utility model not only realizes the recycling of hot air, but also removes dust and humid air while recovering waste heat, thereby increasing the application scope of the heat pump and reducing the energy consumption of the drying tower. The combination of clean energy and the drying tower conforms to the concept of green drying, energy saving and environmental protection.

[0067] Application example 1 of the utility model: for example, when corn with high moisture content is fed, the moisture content in the upper part of the drying tower is the highest, and rapid precipitation and drying can be carried out at a temperature of 90-100°C in the first temperature zone drying section. As the moisture content decreases, the second temperature zone drying section uses a temperature of 80-90°C for drying, and the third temperature zone drying section uses a temperature of 70-80°C for drying. This is done to ensure the quality of the corn while achieving rapid precipitation according to the precipitation characteristics of the corn.

[0068] Application example 2 of the utility model: For example, when drying seeds, the drying temperature is low, and the temperature of the three heat pumps can be controlled at about 45°C for constant temperature drying. At this time, the actual load of the heat pump is small, and the internal compressors can automatically shut down several units according to the temperature requirements. The purpose of this is to save energy and efficiency without wasting heat sources. The application scenario examples are not limited to this.

[0069] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention, and the contents not described in detail in this specification shall belong to the prior art known to professional and technical personnel in the field.

Claims

1. Drying tower, characterized by: It includes drying sections with different temperature zones arranged from top to bottom; Each of the temperature zone drying sections comprises a drying chamber, an air outlet, a dust removal mechanism, an air energy heat pump, and a hot air blower; the air outlet is provided on the drying chamber; the air inlet of the dust removal mechanism is connected to the air outlet, the air outlet of the dust removal mechanism is connected to the air inlet of the heat pump, and the air outlet of the heat pump is connected to the drying chamber via the hot air blower; A partition is arranged between the air outlet ducts of the drying sections in different temperature zones to separate the different temperature zones.

2. The drying tower according to claim 1, characterized in that: The temperature zone drying section comprises: First temperature zone drying section; A second temperature zone drying section is arranged below the first temperature zone drying section; The third temperature zone drying section is arranged below the second temperature zone drying section; The drying temperatures of the first temperature zone drying section, the second temperature zone drying section, and the third temperature zone drying section are gradually reduced.

3. The drying tower according to claim 1, characterized in that: The air energy heat pump comprises: A total heat exchanger, wherein a heat pump air inlet and a fresh air inlet are arranged on the total heat exchanger; the heat pump air inlet is connected to the air outlet of the dust removal mechanism; the fresh air inlet is used to introduce fresh air into the air energy heat pump; the total heat exchanger is used to preheat the fresh air by utilizing the waste heat of the drying section in the temperature zone; A condenser connected to the total heat exchanger, a heat pump air outlet is arranged on the condenser, and the condenser is used to heat the fresh air; The evaporator is connected to the total heat exchanger, and the evaporator is used to absorb the residual heat after heat exchange through the total heat exchanger and then discharge the exhaust gas.

4. The drying tower according to claim 1, characterized in that: In each temperature zone drying section, a first air outlet duct and a second air outlet duct are respectively arranged on both sides of the drying chamber; a first dust removal mechanism is arranged on the first air outlet duct; a second dust removal mechanism is arranged on the second air outlet duct; the first dust removal mechanism and the second dust removal mechanism are both connected to the air energy heat pump.

5. The drying tower according to claim 1 or 4, characterized in that: The dust removal mechanism is a pulse dust collector, and an air shutoff is provided on the pulse dust collector to discharge dust, impurities and particles collected by the pulse dust collector.

6. The drying tower according to claim 4, characterized in that: The drying tower adopts a double grain column structure; a ventilation angle box is arranged in the drying chamber; A hot air inlet is arranged on the drying chamber of each temperature zone drying section, and the hot air inlet is arranged on the side panel of the drying chamber between the corresponding air outlet ducts.

7. The drying tower according to claim 2, characterized in that: The drying tower further comprises a cooling section, which is arranged below the lowest temperature zone drying section.

8. The drying tower according to claim 7, characterized in that: The cooling section is provided with a cold air inlet, and the cold air inlet is connected to the cold air machine via a pipeline.

9. The drying tower according to claim 1, characterized in that: The drying tower also includes a feeding device for conveying materials to the drying tower.

10. The drying tower according to claim 9, characterized in that: The feeding device is a bucket elevator.

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