Drying system

Abstract

The utility model relates to the technical field of lithium battery production, in particular to a drying system which comprises a drying production line provided with an air supply outlet and an air exhaust outlet. The heat pump mechanism is provided with an evaporation side and a condensation side; the sensible heat exchanger is provided with a first channel and a second channel; the first end of the first channel communicates with outside fresh air, the second end of the first channel is connected with the air supply outlet, and the fresh air exchanges heat with the condensation side in the air supply process; the first end of the second channel is communicated with the evaporation side, and the second end of the second channel is communicated with the exhaust outlet. According to the embodiment of the utility model, the condensation side of the heat pump mechanism is adopted for heat exchange, the energy efficiency ratio is obviously higher, and meanwhile, after the sensible heat exchanger is adopted, the heat of exhaust air can be further recovered, so that the energy consumption can be reduced. And meanwhile, the heat of the exhaust air can preheat the fresh air, so that the energy consumption can be further reduced, and the energy utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium electricity production technical field, concretely relates to a drying system. BACKGROUND

[0002] Traditional lithium electricity production process drying step adopts electric heating heat supply, carries out heating through heat conducting oil and its heat exchanger to the air in the drying oven. At present, more than 90% of traditional electric heating drying oven equipment is to adopt unified monomer drying oven unit, and the electric heating configuration is same.

[0003] But this kind of way makes energy utilization efficiency low, is not conducive to environmental protection. CONTENT OF UTILITY MODEL

[0004] Therefore, the utility model provides a drying system to solve the problem of low energy utilization rate when adopting electric heating mode for drying in lithium electricity production process.

[0005] Firstly, the utility model provides a drying system, which comprises:

[0006] Drying production line, which is provided with an air supply port and an air exhaust port;

[0007] Heat pump mechanism, which is provided with an evaporation side and a condensation side; the condensation side is provided with a condenser and a heat exchange assembly matched with the condenser for heat exchange; the heat exchange assembly is provided with a first heat exchange side and a second heat exchange side, and a heat exchange medium circulates between the first heat exchange side and the second heat exchange side; the first heat exchange side of the heat exchange assembly is arranged close to the condenser, and the second heat exchange side is arranged in the drying production line;

[0008] Sensible heat exchanger, which is provided with a first channel and a second channel in staggered intersection; the first channel and the second channel exchange heat at the coincident position;

[0009] The first end of the first channel is communicated with fresh air outside, the second end of the first channel is connected with the air supply port, and the fresh air is exchanged with the second heat exchange side after being conveyed into the drying production line;

[0010] The first end of the second channel is communicated with the evaporation side, and the second end of the second channel is communicated with the air exhaust port.

[0011] Beneficial effects: the utility model discloses an embodiment exchanges heat through the condensing side of heat pump mechanism, compared with traditional electric heating heating mode, obviously energy efficiency ratio is higher, simultaneously, after using sensible heat heat exchanger, the heat of exhaust air can be further recovered, thereby can realize reducing energy consumption. Meanwhile, after the fresh air passes through sensible heat heat exchanger, the heat of exhaust air can preheat the fresh air, thereby can reduce the energy consumed by heat pump mechanism, therefore can further reduce energy consumption, improve energy utilization. Further, compared with traditional heat pipe heat exchanger, sensible heat heat exchanger can directly act as intermediate exchange medium, can directly exchange heat with the temperature and humidity of air, need not set up traditional complex pipeline, further simplifies overall structure layout.

[0012] In an alternative embodiment, the heat exchange assembly comprises:

[0013] The containing box is internally provided with the heat exchange medium; the containing box exchanges heat with the condenser;

[0014] The heating coil is connected with the containing box; the heating coil is arranged in the drying production line along the conveying direction of the drying production line, and the fresh air exchanges heat with the heating coil after entering the drying production line.

[0015] In an alternative embodiment, the containing box comprises a first box body and a second box body, the first box body is a hot water tank, and the second box body is a return water tank.

[0016] In an alternative embodiment, the heat exchange assembly further comprises:

[0017] The first pipeline has one end connected with the water outlet of the first box body and the other end connected with the water inlet of the heating coil;

[0018] The second pipeline has one end connected with the water outlet of the heating coil and the other end connected with the return water outlet of the second box body;

[0019] The third pipeline has one end connected with the water outlet of the second box body and the other end connected with the heat exchange inlet of the condenser;

[0020] The fourth pipeline has one end connected with the heat exchange outlet of the condenser and the other end connected with the return water outlet of the first box body.

[0021] In an alternative embodiment, two heating coils are provided, one heating coil is arranged on the upstream side of the drying production line, and the other heating coil is arranged on the downstream side of the drying production line; and the two heating coils are arranged in extension along the conveying direction of the drying production line.

[0022] In an alternative embodiment, the drying production line comprises:

[0023] a drying cavity, provided with the air supply ports and the air exhaust port;

[0024] a conveying assembly arranged in the drying cavity, configured to convey the medium to be dried;

[0025] an air duct assembly, provided with an air inlet channel and an air exhaust channel, the first end of the air inlet channel is connected with the air supply port, the second end of the air inlet channel is connected with the second end of the first channel, one end of the air exhaust channel is connected with the second end of the second channel, and the second end of the air exhaust channel is connected with the air exhaust port.

[0026] In an alternative embodiment, along the conveying direction of the conveying assembly, a part of the air supply ports are arranged on the upstream side of the conveying assembly, and the other part of the air supply ports are arranged on the downstream side of the conveying assembly, and all the air exhaust ports are arranged in the middle region of the conveying assembly.

[0027] Beneficial effects: the air supply ports in this embodiment are arranged on the upstream side and the downstream side, which can ensure that fresh air enters the drying cavity from multiple positions and is uniformly distributed in the entire drying area. Moreover, the fresh air can be introduced more effectively, the air circulation speed can be increased, and the drying efficiency can be improved. At the same time, a more uniform temperature gradient can be formed, and uneven drying caused by temperature differences can be avoided. Further, the air exhaust ports are arranged in the middle region, which can effectively exhaust moisture from the middle position, avoid the retention of moisture in the drying cavity, ensure the uniform distribution of air flow, and further improve the overall drying effect. Moreover, the air exhaust ports are concentrated in the middle region, which can better utilize the heat generated during the drying process and reduce energy waste.

[0028] In an alternative embodiment, the drying cavity is provided with two air supply ports and one air exhaust port, the two air supply ports are arranged at the upstream end and the downstream end of the conveying assembly, and the air exhaust port is arranged at the middle position of the conveying assembly.

[0029] In an alternative embodiment, the drying production line further comprises:

[0030] a heat preservation layer, arranged on the inner wall of the drying production line.

[0031] Beneficial effects: the heat preservation layer can effectively reduce the heat exchange inside and outside the drying cavity, reduce heat loss, and improve the energy efficiency of the entire system. Moreover, by reducing heat loss, energy consumption can be significantly reduced, thereby saving operating costs. At the same time, the heat preservation layer helps to maintain the temperature stability inside the drying cavity, avoids temperature fluctuations, ensures the uniformity and consistency of the drying process, and the stable temperature environment can improve the drying effect and ensure product quality. Further, it can also improve energy efficiency and reduce energy consumption, help reduce carbon emissions, and meet environmental protection requirements.

[0032] In an alternative embodiment, the first channel is provided with a fresh air valve and a fresh air fan at one end close to the outside world, and the evaporation side is provided with an exhaust valve and an exhaust fan at one end close to the outside world. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present application, the drawings needed in the specific embodiments or related technology description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 The current drying principle diagram of electric heating method;

[0035] Figure 2 The current drying efficiency diagram of electric heating method;

[0036] Figure 3 The structure diagram of the second embodiment of the drying system and the condenser and heat exchange assembly in the embodiment of the present application;

[0037] Figure 4 The current drying principle diagram of electric heating method; Figure 3 The current drying principle diagram of electric heating method;

[0038] Figure 5 The current drying principle diagram of electric heating method; Figure 3 The current drying principle diagram of electric heating method;

[0039] Figure 6 The current drying principle diagram of electric heating method;

[0040] Explanation of reference signs:

[0041] 1, drying production line; 11, air supply port; 12, exhaust port; 13, drying cavity; 14, conveying assembly; 15, air duct assembly; 16, heat preservation layer;

[0042] 2, heat pump mechanism; 21, evaporator; 22, expansion valve; 23, compressor; 24, condenser; 25, heat exchange assembly; 251, containing box; 2511, first box body; 2512, second box body; 2513, first pipeline; 2514, second pipeline; 2515, third pipeline; 2516, fourth pipeline; 252, heating coil;

[0043] 3, sensible heat exchanger; 31, first channel; 32, second channel. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0045] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside, it can be wireless connection, or wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0048] The drying step in the traditional lithium battery production process adopts electric heating heat supply, and air in the oven is heated through heat conducting oil and its heat exchanger. At present, more than 90% of the traditional electric heating oven equipment adopts unified single oven unit, and the electric heating configuration is the same. However, this method makes the energy utilization efficiency low and is not conducive to environmental protection.

[0049] Therefore, the drying system is provided to solve the problem of low energy utilization rate when electric heating is used for drying in the lithium battery production process.

[0050] The embodiments of the present application will be described below in combination with Figures 1 to 6 , and the embodiments of the present application will be described below in combination with

[0051] According to the embodiments of the present application, on the one hand, a drying system is provided, which comprises a drying production line 1, a heat pump mechanism 2 and a sensible heat exchanger 3.

[0052] Specifically, in the present embodiment, the drying production line 1 comprises a roller driving combination for driving the one-way movement of the medium to be dried, which can be composed of rollers, driving motors and their supporting electrical equipment. The drying production line 1 is also provided with an air supply port 11 and an air exhaust port 12, both of which are located at the top of the drying production line 1 to facilitate the installation of the air duct connection. Of course, the air supply port 11 and the air exhaust port 12 can also be installed at other positions of the drying production line 1, and the present embodiment is only an example, but it is not limited thereto, and those skilled in the art can make changes according to the actual situation, as long as the same technical effects can be achieved.

[0053] Further, in the present embodiment, the heat pump mechanism 2 generally comprises four components of the heat pump, i.e. a compressor 23, an evaporator 21, a condenser 24 and an expansion valve 22. The refrigerant circulates in the heat pump mechanism 2 to complete efficient heat transfer: in turn through the compression of the compressor 23, the release of heat by the condenser 24, the pressure reduction by the expansion valve 22, the heat absorption by the evaporator 21 and back to the compressor 23. The evaporation side of the heat pump mechanism 2 is the cooling side where the evaporator 21 is located, and the condensation side of the heat pump mechanism 2 is the heating side where the condenser 24 is located. After the normal temperature air passes through the evaporator 21, it absorbs the heat of the evaporator 21, so that the temperature of the normal temperature air becomes lower, and therefore it is the cooling side. After the normal temperature air passes through the condenser 24, it absorbs the heat of the condenser 24, so that the temperature of the normal temperature air becomes higher, and therefore it is the heating side.

[0054] Specifically, in the present embodiment, the compressor 23 is a power source of the fluorine system, which compresses the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure gas to enter the condenser 24. The compressor 23 is a high-temperature refrigerant compressor 23, wherein the high-temperature refrigerant can be R134a, R515B, R245fa, R1233zd, R1234yd, R1336mzz or other refrigerants with a critical temperature greater than 100℃.

[0055] The condenser 24 functions to release heat inside to cool the refrigerant into a high-temperature and high-pressure liquid. The condensation heat release process of the refrigerant in the condenser 24 directly heats the air, which is heated into high-temperature and dry air at the target temperature, and enters the air supply port 11. Thus, heat loss that can occur in other heat exchange processes is avoided, and operation is more efficient.

[0056] The expansion valve 22 functions to reduce the pressure of the refrigerant after passing through the expansion valve 22 to become a low-temperature and low-pressure liquid, which enters the evaporator 21.

[0057] The evaporator 21 functions to absorb heat from the air in the exhaust air duct in a low-temperature and low-pressure state to evaporate into a gas. At the same time, the medium-dry exhaust air with moisture passes through the evaporator 21 to be cooled and dehumidified, and is reduced to low-temperature air and discharged, and the cooling process is accompanied by condensate water, thereby completing the dehumidification, cooling, and heat recovery of the exhaust air.

[0058] Further, in the present embodiment, as shown in Figure 3 The condensing side includes the condenser 24 and the heat exchange assembly 25.

[0059] In the present embodiment, the condenser 24 only serves as a heat source for the heat exchange assembly 25, and in actual operation, the heat exchange assembly 25 exchanges heat with the condenser 24 and then exchanges heat with fresh air.

[0060] Specifically, the present embodiment is provided with the heat exchange assembly 25, which exchanges heat with the condenser 24. The heat exchange assembly 25 is provided with a first heat exchange side and a second heat exchange side, and the heat exchange medium in the heat exchange assembly 25 circulates between the first heat exchange side and the second heat exchange side.

[0061] The first heat exchange side of the heat exchange assembly 25 is arranged close to the condenser 24 and exchanges heat with the condenser 24. The second heat exchange side of the heat exchange assembly 25 is arranged in the drying production line 1, and the fresh air entering the drying production line 1 exchanges heat with the second heat exchange side.

[0062] In the present embodiment, arranging the second heat exchange side in the drying production line 1 can reduce heat loss. At the same time, the high temperature of the second heat exchange side can further improve the drying efficiency of the drying production line 1. That is, in the drying production line 1, the second heat exchange side and the fresh air after exchanging heat with the second heat exchange side can simultaneously act on the medium to be dried in the drying production line 1, and the fresh air can further circulate and evenly dry the internal heat of the drying production line 1, achieving the effect of doubling the drying efficiency.

[0063] Further, in the embodiment, the sensible heat exchanger 3 is provided with the first channel 31 and the second channel 32 which are staggered and crossed, and the first channel 31 exchanges heat with the second channel 32 at the coincident position. The first end of the first channel 31 is communicated with the fresh air, the second end of the first channel 31 is connected with the air supply port 11, and the fresh air is transported into the drying production line 1 and exchanges heat with the second heat exchange side. The first end of the second channel 32 is communicated with the evaporation side, and the second end of the second channel 32 is communicated with the air exhaust port 12.

[0064] In the actual working process, the low-temperature dried fresh air first passes through the first channel 31 of the sensible heat exchanger 3 and is heated by the high-temperature exhaust air in the second channel 32, and the temperature is increased to the medium temperature to realize preheating. Then the medium-temperature dried air passes through the condensation side, the air is heated to the target temperature, and the humidity of the air heated through the condensation side is significantly reduced. The high-temperature dried air is sent to the drying production line 1 to dry the products. The high-temperature exhaust air after drying has increased humidity, is sent to the second channel 32 of the sensible heat exchanger 3 through the air exhaust port 12, and the high-temperature exhaust air in the second channel 32 heats the low-temperature fresh air, and the temperature of the exhaust air is reduced to the medium temperature. The medium-temperature and high-humidity exhaust air exchanges heat through the evaporation side, and then condensate is separated and discharged, and the exhaust air is discharged from the whole system after being changed into low-temperature air.

[0065] In this way, the embodiment of the utility model exchanges heat through the condensation side of the heat pump mechanism 2, and compared with the traditional electric heating heating mode, the energy efficiency ratio is obviously higher. Meanwhile, after the sensible heat exchanger 3 is used, the heat of the exhaust air can be further recovered, so that the energy consumption can be reduced. Meanwhile, the heat of the exhaust air can preheat the fresh air after the fresh air passes through the sensible heat exchanger 3, so that the energy consumption of the heat pump mechanism 2 can be reduced, and the energy utilization rate can be further improved. Further, compared with the traditional heat pipe exchanger, the sensible heat exchanger 3 can directly act as an intermediate exchange medium and directly exchange heat with the temperature and humidity of the air, without the need to set a traditional complex pipeline, and the overall structure layout is further simplified.

[0066] Further, in an optional embodiment, the heat exchange assembly 25 includes a containing box 251 and a heating coil 252.

[0067] Specifically, in the embodiment, the inside of the containing box 251 is provided with the heat exchange medium. The heat exchange medium can be various heat exchange liquids, such as oil, water, ethanol and the like. Of course, the specific material of the heat exchange medium is only illustrative but not limited in the embodiment, and the person skilled in the art can change it according to the actual situation, which can achieve the same technical effect.

[0068] In the accommodating box 251, the interior needs to be separated by a partition plate, one side of the partition plate is a hot water cavity, the hot water cavity stores hot water after heat exchange with the condenser 24, the other side of the partition plate is a return water cavity, the return water cavity stores return water from the heating coil 252. The return water in the return water cavity is connected with the first end of the heat exchange pipe of the condenser 24, and the return water after heat exchange forms hot water and flows into the hot water cavity from the second end of the heat exchange pipe of the condenser 24.

[0069] Further, in the present embodiment, the heating coil 252 is connected with the accommodating box 251, for example, one end of the heating coil 252 is connected with the hot water cavity of the accommodating box 251, and the other end of the heating coil 252 is connected with the return water cavity of the accommodating box 251. The heating coil 252 is arranged in the drying production line 1 along the conveying direction of the drying production line 1, and the fresh air entering the drying production line 1 exchanges heat with the heating coil 252.

[0070] In actual working process, the high-temperature hot water after heat exchange with the condenser 24 flows in the pipeline, exchanges heat with the medium-temperature air entering the drying production line 1, and is continuously heated to high-temperature air along with the air flow. At the same time, the heating coil 252 is close to the medium to be dried, and part of the heat is transferred to the medium to be dried in the form of heat radiation, and the drying and heating process is completed. The heat exchanger type of the heating coil 252 is a high-efficiency micro-channel heat exchanger or a finned tube heat exchanger. The high-temperature pure water (80-120℃) flows inside the heating coil 252, and the air flows outside the heating coil 252. The fins are flat, corrugated or windowed type fins arranged to increase the heat exchange area for full contact with the air. The medium-temperature hot water after heat exchange returns to the return water cavity, exchanges heat with the condenser 24, and re-forms high-temperature hot water.

[0071] Of course, the specific flow direction of the hot water in the heating coil 252 and the flow direction of the fresh air can be set in opposite directions to realize counter-flow heat exchange. In counter-flow heat exchange, the temperature of the hot water gradually decreases, and the temperature of the air gradually increases, and the temperature difference between the two is more evenly distributed along the length of the heat exchanger. This makes the average temperature difference of the entire heat exchange process larger than that of parallel flow, thereby improving the heat transfer efficiency. In counter-flow arrangement, the outlet temperature of the air is close to the outlet temperature of the hot water, which can heat the air to a higher temperature and improve the drying capacity. Counter-flow heat exchange is closer to the ideal performance of the heat exchanger, and theoretically can achieve minimum irreversibility, reduce heat loss, and thus improve the performance coefficient of the system. In the drying process, the wet air is gradually heated, the humidity decreases, the absolute humidity remains unchanged, and the enthalpy increases. The counter-flow mode better matches the demand of heat and mass transfer.

[0072] Further, in an alternative embodiment, two heating coils 252 are provided, one heating coil 252 is arranged on the upstream side of the drying production line 1, and the other heating coil 252 is arranged on the downstream side of the drying production line 1. Both heating coils 252 extend along the conveying direction of the drying production line 1. The upstream side of the drying production line 1 is the side close to the inlet of the drying production line 1, and the downstream side of the drying production line 1 is the side close to the outlet of the drying production line 1.

[0073] Further, in an alternative embodiment, the containing box 251 comprises a first box body 2511 and a second box body 2512, the first box body 2511 is a hot water tank, and the second box body 2512 is a return water tank.

[0074] That is, when the heat exchange medium is water, after the water in the heat exchange pipe of the condenser 24 is heat exchanged with the condenser 24, the water becomes hot water, then enters the first box body 2511, and then enters the heating coil 252 from the first box body 2511. After the fresh air is heat exchanged with the heating coil 252, the fresh air becomes medium-temperature return water, and then enters the second box body 2512. Finally, the return water enters the heat exchange pipe of the condenser 24 to be heat exchanged with the condenser 24.

[0075] Further, in an alternative embodiment, the heat exchange assembly 25 further comprises a first pipeline 2513, a second pipeline 2514, a third pipeline 2515, and a fourth pipeline 2516.

[0076] Specifically, one end of the first pipeline 2513 is connected with the water outlet of the first box body 2511, and the other end of the first pipeline 2513 is connected with the water inlet of the heating coil 252. One end of the second pipeline 2514 is connected with the water outlet of the heating coil 252, and the other end of the second pipeline 2514 is connected with the return water outlet of the second box body 2512. One end of the third pipeline 2515 is connected with the water outlet of the second box body 2512, and the other end of the third pipeline 2515 is connected with the heat exchange inlet of the condenser 24. One end of the fourth pipeline 2516 is connected with the heat exchange outlet of the condenser 24, and the other end of the fourth pipeline 2516 is connected with the return water outlet of the first box body 2511.

[0077] When the drying production line 1 is large, the corresponding heating coil 252 is also large, and the temperature difference of the hot water before and after heat exchange in the drying production line 1 is also large. In order to avoid the influence of the return water on the water temperature of the inlet, and to ensure the stability of the water temperature of the inlet, two water tanks, i.e., the first box body 2511 and the second box body 2512, are used. Due to the large heat exchange amount, the water flow of this part of heat exchange is also large, and the large water flow will have a certain impact on the water temperature in the water tank. Therefore, it is a relatively stable way to use two water tanks to separate cold and hot water.

[0078] Further, in an alternative embodiment, the drying production line 1 comprises a drying cavity 13, a conveying assembly 14 and an air duct assembly 15.

[0079] Specifically, in the present embodiment, the drying cavity 13 is provided with the air supply port 11 and the air exhaust port 12. The conveying assembly 14 is arranged in the drying cavity 13, and is used to convey the medium to be dried. The conveying assembly 14 can be composed of rollers, a driving motor and its matching electrical equipment. Of course, the present embodiment is merely an example of the composition of the conveying assembly 14, but it is not limited thereto, and those skilled in the art can make changes according to the actual situation, as long as the same technical effects can be achieved.

[0080] Further, the air duct assembly 15 is provided with an air inlet channel and an air exhaust channel. The first end of the air inlet channel is connected with the air supply port 11, the second end of the air inlet channel is connected with the second end of the first channel 31, one end of the air exhaust channel is connected with the second end of the second channel 32, and the second end of the air exhaust channel is connected with the air exhaust port 12.

[0081] Further, in an alternative embodiment, the drying cavity 13 is provided with at least two air supply ports 11 and at least one air exhaust port 12. The air supply ports 11 can be uniformly arranged on the top of the drying cavity 13, so that the medium to be dried can be uniformly dried during the conveying process. The air exhaust port 12 can be arranged at the bottom of the drying cavity 13, for example, around the bottom, so that the path during the air flow circulation process can be increased, and the heat loss can be reduced.

[0082] Of course, the present embodiment is merely an example of the arrangement of the air supply port 11 and the air exhaust port 12, but it is not limited thereto, and those skilled in the art can make changes according to the actual situation, as long as the same technical effects can be achieved.

[0083] Further, as shown in Figure 1 , the current electric heating drying method is usually uniformly provided with a matching air inlet and air outlet along the conveying direction of the production line, so that the overall dehumidification efficiency presents a wave of high and low, as shown in Figure 2 , so the overall dehumidification efficiency is low, and the setting of the multi-air port system is complex, and the energy utilization efficiency is low, which is not conducive to environmental protection.

[0084] Further, in an alternative embodiment, as shown in Figure 3 , along the conveying direction of the conveying assembly 14, a part of the air supply ports 11 are arranged on the upstream side of the conveying assembly 14, and the other part of the air supply ports 11 are arranged on the downstream side of the conveying assembly 14, and all the air exhaust ports 12 are arranged in the middle region of the conveying assembly 14.

[0085] In this embodiment, the change of the moisture content of the drying medium and the overall flow direction of the air along the conveying direction of the conveying assembly 14, i.e., the conveying direction of the drying production line 1, are as shown. Figure 4

[0086] As can be seen, after the air flow enters the drying production line 1, the air flows from the upstream side and the downstream side to the middle region of the drying production line 1 at the same time. Figure 4 Because the heat exchange medium flows in the opposite direction of the fresh air flow for heat exchange, the temperature and the moisture content are the highest at the middle of the heat exchange medium inlet. However, because the fresh air carries the moisture of the materials blown in from the inlet, the dehumidification efficiency is not high at the beginning, and the moisture of the heat exchange medium is the highest at the beginning, and the moisture of the fresh air inlet is the lowest. In addition, the heat exchange efficiency is relatively high at the beginning due to the radiation heat exchange. The overall efficiency curve of the present embodiment is relatively flat, and the temperature and humidity curve can be fully utilized for dehumidification. In addition, the heat exchange efficiency can be increased by utilizing the reverse heat exchange effect of the heating element and the fresh air, and the heating curve of the radiation heat exchange is more uniform, and there is no large temperature deviation.

[0087] In this way, the air supply port 11 is arranged at the upstream side and the downstream side in the present embodiment, which can ensure that the fresh air enters the drying cavity 13 from multiple positions and is uniformly distributed in the entire drying region. In addition, the fresh air can be introduced more effectively, the air circulation speed can be increased, and the drying efficiency can be improved. At the same time, a more uniform temperature gradient can be formed to avoid uneven drying caused by temperature differences. Further, the air exhaust port 12 is arranged at the middle region in the present embodiment, which can effectively exhaust the moisture from the middle position to avoid the retention of moisture in the drying cavity 13, ensure the uniform distribution of the air flow, and further improve the overall drying effect. In addition, the air exhaust port 12 is concentrated in the middle region, which can better utilize the heat generated during the drying process and reduce energy waste.

[0088] Further, in an alternative embodiment, as shown in Figure 3 the drying cavity 13 is provided with two air supply ports 11 and one air exhaust port 12. The two air supply ports 11 are arranged at the upstream end and the downstream end of the conveying assembly 14, respectively, and the air exhaust port 12 is arranged at the middle position of the conveying assembly 14.

[0089] Further, in an alternative embodiment, the drying production line 1 further comprises a heat preservation layer 16 arranged on the inner wall of the drying production line 1. Of course, the specific material of the heat preservation layer 16 is not limited in the present embodiment, and those skilled in the art can make changes according to the actual situation as long as the same technical effects can be achieved.

[0090] ​In this way, the heat preservation layer 16 can effectively reduce the heat exchange between the inside and outside of the drying cavity 13, reduce heat loss, and improve the energy efficiency of the entire system. Moreover, by reducing heat loss, energy consumption can be significantly reduced, thereby saving operating costs. At the same time, the heat preservation layer 16 helps to maintain the temperature stability in the drying cavity 13, avoids temperature fluctuations, ensures the uniformity and consistency of the drying process, and a stable temperature environment can improve the drying effect and ensure product quality. Further, it can also improve energy efficiency and reduce energy consumption, help reduce carbon emissions, and meet environmental protection requirements.

[0091] Further, the enthalpy psychrometric chart of the drying production line 1 is as shown in Figure 6 The drying process is as follows: 1-2 heating process: sensible heat exchanger 3 + condenser 24; 2-3 drying process: drying air duct of the production line body; 3-4 sensible heat recovery process: sensible heat exchanger 3; 4-5 dehumidification and cooling process (mainly heat recovery heat): evaporator 21.

[0092] In summary, the present embodiment uses efficient heat recovery technology and a refrigerant direct heating system, and the system energy efficiency ratio (COP) is significantly improved. Compared with traditional electric heating drying systems, energy consumption is reduced by more than 30%. The present embodiment uses environmentally friendly refrigerants, reducing the impact on the environment, and the closed cycle design avoids pollution of the external environment. Moreover, the various components of the present embodiment can be automatically controlled, reducing the need for manual operation, reducing the difficulty of operation, and improving production efficiency. Due to the reduction of energy consumption and the improvement of drying efficiency, the operating cost of the system is greatly reduced, and good economic benefits are achieved.

[0093] Further, in an alternative embodiment, the first channel 31 is provided with a fresh air fan and a fresh air valve at one end close to the outside, and the evaporative side is provided with an exhaust fan and an exhaust valve at one end close to the outside.

[0094] By adjusting the opening value of the exhaust valve and the fresh air valve, the exhaust humidity of the drying production line 1 can be adjusted. When increasing the opening value of the exhaust valve and reducing the opening value of the fresh air valve, the humidity can be reduced. When reducing the opening value of the exhaust valve and increasing the opening value of the fresh air valve, the humidity can be increased.

[0095] In summary, in combination with the heating and dehumidification process of the sensible heat exchanger 3 and the condenser 24, and the evaporator 21, the temperature and humidity of the air can be accurately adjusted to a range suitable for drying requirements. The precise air conditioning capability of the present embodiment makes the drying process more uniform and stable, improving the drying quality of the product.

[0096] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.

Claims

1. A drying system, characterized by, The application relates to a heat pump drying production line. The heat pump mechanism (2) is provided with an evaporating side and a condensing side; the condensing side is provided with a condenser (24) and a heat exchange assembly (25) matched with the condenser (24) for heat exchange; the heat exchange assembly (25) is provided with a first heat exchange side and a second heat exchange side, and a heat exchange medium circulates between the first heat exchange side and the second heat exchange side; the first heat exchange side of the heat exchange assembly (25) is arranged close to the condenser (24), and the second heat exchange side is arranged in the drying production line (1); The sensible heat exchanger (3) is provided with a first channel (31) and a second channel (32) which are staggered and crossed; the first channel (31) and the second channel (32) exchange heat at a coincident position; The first end of the first channel (31) is communicated with fresh air outside, and the second end of the first channel (31) is connected with the air supply port (11); after the fresh air is transported into the drying production line (1), the fresh air exchanges heat with the second heat exchange side; The first end of the second channel (32) is communicated with the evaporating side, and the second end of the second channel (32) is communicated with the air exhaust port (12). The heat exchange assembly (25) comprises:

2. The drying system of claim 1, wherein, A containing box (251) internally provided with the heat exchange medium; the containing box (251) exchanges heat with the condenser (24); A heating coil (252) connected with the containing box (251); the heating coil (252) is arranged in the drying production line (1) along the conveying direction of the drying production line (1); after the fresh air enters the drying production line (1), the fresh air exchanges heat with the heating coil (252). The containing box (251) comprises a first box body (2511) and a second box body (2512); the first box body (2511) is a hot water box, and the second box body (2512) is a backwater box.

3. The drying system of claim 2, wherein, The heat exchange assembly (25) further comprises:

4. The drying system of claim 3, wherein, A first pipeline (2513); one end of the first pipeline (2513) is connected with a water outlet of the first box body (2511), and the other end of the first pipeline (2513) is connected with a water inlet of the heating coil (252); A second pipeline (2514); one end of the second pipeline (2514) is connected with a water outlet of the heating coil (252), and the other end of the second pipeline (2514) is connected with a backwater outlet of the second box body (2512); A third pipeline (2515); one end of the third pipeline (2515) is connected with a water outlet of the second box body (2512), and the other end of the third pipeline (2515) is connected with a heat exchange inlet of the condenser (24); A fourth pipeline (2516); one end of the fourth pipeline (2516) is connected with a heat exchange outlet of the condenser (24), and the other end of the fourth pipeline (2516) is connected with a backwater outlet of the first box body (2511). ​ 5. The drying system of claim 4, wherein, Two heating coils (252) are arranged, one heating coil (252) is arranged on the upstream side of the drying production line (1), and the other heating coil (252) is arranged on the downstream side of the drying production line (1); and the two heating coils (252) are arranged along the conveying direction of the drying production line (1).

6. The drying system according to any one of claims 1 to 5, characterized in that The drying production line (1) comprises: A drying cavity (13) is provided with the air supply port (11) and the air exhaust port (12); A conveying assembly (14) is arranged in the drying cavity (13), and the conveying assembly (14) is used for conveying the medium to be dried; An air duct assembly (15) is provided with an air inlet channel and an air exhaust channel, the first end of the air inlet channel is connected with the air supply port (11), the second end of the air inlet channel is connected with the second end of the first channel (31), one end of the air exhaust channel is connected with the second end of the second channel (32), and the second end of the air exhaust channel is connected with the air exhaust port (12).

7. The drying system of claim 6, wherein, Along the conveying direction of the conveying assembly (14), part of the air supply ports (11) are arranged on the upstream side of the conveying assembly (14), and the other part of the air supply ports (11) are arranged on the downstream side of the conveying assembly (14), and all the air exhaust ports (12) are arranged in the middle region of the conveying assembly (14).

8. The drying system of claim 7, wherein, The drying cavity (13) is provided with two air supply ports (11) and one air exhaust port (12), the two air supply ports (11) are arranged at the upstream end and the downstream end of the conveying assembly (14) respectively, and the air exhaust port (12) is arranged at the middle position of the conveying assembly (14).

9. The drying system according to any one of claims 1 to 5, characterized in that The drying production line (1) further comprises: A heat preservation layer (16) is arranged on the inner wall of the drying production line (1).

10. The drying system according to any one of claims 1 to 5, characterized in that The first channel (31) is provided with a fresh air valve and a fresh air fan at one end close to the outside, and the evaporation side is provided with an exhaust valve and an exhaust fan at one end close to the outside.

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