Heat pump coupling low-temperature regeneration rotating wheel dehumidification opening and closing integrated drying system

Abstract

The invention discloses a heat pump coupling low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system, and relates to the technical field of agricultural product drying of heat pump and rotary wheel combined dehumidification. When the drying system is used for drying the first half section of materials, the return air humidity of a drying chamber is large, a heat pump closed drying mode is adopted for operation, and condensation dehumidification is conducted through an evaporator; the dehumidification efficiency is high, the gasification latent heat released by water vapor condensation is fully utilized, and the high-temperature end of the heat pump can obtain more heat for drying materials; when the water content in the materials is greatly reduced, the drying system operates by adopting a material drying rear half section loop, return air of a drying chamber is dehumidified by adopting a dehumidification rotating wheel, the dehumidification rotating wheel has the advantage of deep dehumidification, and the drying rate of the rear half section of the materials can be increased by the drying air with lower humidity; and deep dehumidification of the dehumidification rotating wheel ensures that the drying quality of the materials is improved, and the technical problem that when an existing drying system is used for drying agricultural products, the drying quality is low or the drying rate is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary wheel dehumidification drying, and particularly to a heat pump-coupled low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system. Background Art

[0002] The drying and dehydration treatment of agricultural products is not only the core process for extending their shelf life for safe storage, but also the processing requirements for a series of dried products. Heat pump drying has the significant advantages of being environmentally friendly and having a high energy efficiency ratio, and its application range is very wide. In addition, heat pumps can achieve low-temperature drying, especially for the drying of some thermosensitive crops or Chinese herbal medicine products with high economic value, which has significant advantages.

[0003] The following is the specific analysis idea of the applicant's research and design: Heat pump drying systems can be divided into open drying systems and closed drying systems. In a closed heat pump drying system, the humid and hot air discharged from the drying chamber is cooled and dehumidified by an evaporator and then heated into dry and hot air by a condenser and sent into the drying chamber. The heat released during the cooling and dehumidification of the return air from the drying chamber is fully utilized, and the waste heat recycling is realized with almost no heat loss, which is a major advantage. However, when the return air from the drying chamber is cooled and dehumidified by the evaporator, the air needs to be cooled below the dew point to achieve condensation dehumidification. In the early stage of drying, the air discharged from the drying chamber has a high humidity, and moisture can be fully condensed on the wall surface of the evaporator, thus fully utilizing the latent heat of vaporization of the moisture in the air. However, as the drying progresses, in the later stage of drying, the moisture inside the material is low, the humidity of the exhaust air from the drying chamber is small, and the latent heat of vaporization of the available moisture is less. At this time, when using the evaporator to cool and dehumidify by the method of condensation dehumidification, the efficiency is not high, and the moisture cannot be fully condensed, resulting in a continuous increase in the temperature of the drying chamber, thus affecting the drying quality, and the drying quality of the material is low. Open heat pump drying equipment has certain regional and seasonal limitations in use and is greatly affected by the environmental temperature and humidity. When the environmental temperature is low, it is very difficult to heat the circulating air to the required drying temperature, and the drying rate is low. In addition, in the first half of the drying process, the moisture content of the material is high. After the heat pump operates for a period of time, the drying chamber needs to open the exhaust valve to discharge moisture. The moisture discharge process will not only cause a sharp drop in the temperature inside the drying chamber, but also the exhaust air will carry a large amount of waste heat, resulting in a low drying rate and low system energy efficiency. However, for the second half of the material drying process, the open moisture discharge interval is long and the system energy efficiency ratio is relatively high. Summary of the Invention

[0004] Aiming at the deficiencies in the above background art, the present invention proposes a heat pump-coupled low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system, which solves the technical problems of low drying quality or low drying rate existing in the existing drying system when drying agricultural products.

[0005] The technical solution of the present invention is realized as follows: A heat pump coupled low-temperature regeneration rotary dehumidification on-off integrated drying system includes a dehumidification rotary wheel, heat exchanger I, condenser I, condenser II, evaporator, heat exchanger II, and a drying chamber for drying materials; when the drying system is preheating, the return air of the drying chamber sequentially flows through heat exchanger II, the dehumidification area of the dehumidification rotary wheel, heat exchanger I, and condenser I and then returns to the air inlet of the drying chamber. At this time, fresh air sequentially enters the evaporator and condenser II and then is discharged into the atmosphere; when the drying system is drying the first half of the materials, the return air of the drying chamber sequentially flows through the evaporator, heat exchanger II, the dehumidification area of the dehumidification rotary wheel, heat exchanger I, and condenser I and then returns to the air inlet of the drying chamber; when the drying system is drying the second half of the materials, the return air of the drying chamber sequentially flows through heat exchanger II, the dehumidification area of the dehumidification rotary wheel, and condenser I and then returns to the air inlet of the drying chamber. At this time, fresh air sequentially enters the evaporator, heat exchanger II, condenser II, the regeneration area of the dehumidification rotary wheel, and heat exchanger I and then is discharged into the atmosphere. When the drying system is drying the first half of the materials, the humidity of the return air in the drying chamber is high, and the evaporator 7 is used for condensation dehumidification. Not only is the dehumidification efficiency high, but also the latent heat of vaporization released by the condensation of water vapor is fully utilized, and more heat can be obtained at the high-temperature end of the heat pump for drying the materials; when the water content in the materials is greatly reduced and the difficulty of water analysis increases, at this time, the drying system is drying the second half of the materials, and the return air of the drying chamber is dehumidified by the dehumidification rotary wheel. The dehumidification rotary wheel has the advantage of deep dehumidification, and the drier air with lower humidity can increase the drying rate of the second half of the materials. At the same time, the driving energy of the regeneration area on the dehumidification rotary wheel makes full use of outdoor air energy, so the system is more energy-saving and has great energy-saving potential. At the same time, by using the deep dehumidification of the dehumidification rotary wheel, the drying quality of the materials is effectively improved. That is, this application combines parts of the open drying system and the closed drying system through a clever design, gives full play to the advantages of the open drying system and the closed drying system, and combines the characteristics of the low-temperature regeneration rotary wheel. It can not only achieve deep dehumidification and low regeneration temperature, but also ensure the high quality of material drying and improve the drying rate, solving the technical problems of low drying quality or low drying rate existing in the existing drying systems when drying agricultural products.

[0006] Preferably, air valves for controlling the flow direction are provided on the return air paths of the drying system during preheating, the first half of material drying, and the second half of material drying. The setting of the air valves is to adjust the air flow direction on the return air paths of the drying system during preheating, the first half of material drying, and the second half of material drying, so as to control the drying system to be in the return air path of the preheating stage, the return air path of the first half of material drying stage, or the return air path of the second half of material drying stage, realizing the adjustment of the return air paths of the three stages.

[0007] Among them, the air valves include Air Valve I, Air Valve II, Air Valve III, Air Valve IV, Air Valve V, Air Valve VI and Air Valve VII. When the drying system is preheating, the return air of the drying chamber passes through Air Valve III, flows through Air-Air Heat Exchanger II, then passes through the dehumidification zone of the dehumidification wheel, and then through Air-Air Heat Exchanger I. After being heated by Condenser I, under the action of the fan, it enters the drying chamber, and then the next cycle is carried out. In this process, the wheel does not operate. The fresh air enters the evaporator through Air Valve VI, is cooled and then passes through Air Valve I, enters Condenser II through Fan I, and then is discharged into the atmosphere through Air Valve VII. During the operation of the system, Air Valves II, III and V are closed. This process is repeated until the air temperature in the drying chamber reaches the set temperature, and the drying system transfers to the first half of the material drying stage; when the drying system is drying the first half of the material, the high-humidity air return in the drying chamber enters the evaporator through Air Valve V to cool and precipitate moisture. The obtained low-temperature and low-moisture-content air passes through Air Valve III, then flows through Air-Air Heat Exchanger II and the dehumidification wheel in sequence, and then enters Condenser I through Air-Air Heat Exchanger I to be heated. Then, the high-temperature and low-humidity air enters the drying chamber under the action of Fan II to dry the material, thus completing a cycle. In this process, Air Valves I, II and VI are closed, and the dehumidification wheel does not work. When the moisture content of the material drops to a certain value, the drying system enters the second half of the material drying stage; when the drying system is drying the second half of the material, the high-temperature and wet air discharged from the drying chamber passes through Air Valve IV, enters Air-Air Heat Exchanger II, exchanges heat with the low-temperature air flowing through Air-Air Heat Exchanger II, is cooled and then enters the dehumidification zone of the dehumidification wheel to be dehumidified. The obtained low-moisture-content air enters Condenser I to be heated, and then enters the drying chamber under the action of Fan II to dry the material. At the same time, the fresh air enters the evaporator through Air Valve VI to be cooled and dehumidified, then passes through Air Valve II to enter Air-Air Heat Exchanger II, exchanges heat with the high-temperature return air of the drying chamber flowing through Air-Air Heat Exchanger II, is heated and then enters Condenser II through Fan I to be further heated and raised in temperature. Then it enters the regeneration zone of the dehumidification wheel to regenerate the ineffective dehumidification material, enters Air-Air Heat Exchanger I, exchanges heat with the low-temperature air flowing into Air-Air Heat Exchanger I, is cooled and then is discharged into the atmosphere. In this process, Air Valves I, III, V and VII are closed.

[0008] Preferably, both Heat Exchanger I and Heat Exchanger II are air-air heat exchangers. An air-air heat exchanger is a device that uses high-temperature air to exchange heat with low-temperature air through the heat exchanger to achieve the heating or cooling effect. Among them, both Heat Exchanger I and Heat Exchanger II in this application are air-air heat exchangers, in order to fully recover the waste heat of the air discharged from the regeneration zone of the dehumidification wheel to the outside through the setting of the air heat exchanger in the drying system, thereby improving the energy efficiency of the drying system.

[0009] Preferably, a second blower is provided at the air inlet of the drying chamber, and the second blower is located between the drying chamber and the first condenser. A blower does work on the gas by rotating the impeller, converting mechanical energy into gas kinetic energy and pressure energy to form a directional air flow. The second blower in this application is provided to introduce the high-temperature gas pressurized by the second blower into the air inlet of the drying chamber and increase the rate of the high-temperature gas input into the drying chamber.

[0010] Preferably, a first blower is provided at the air inlet of the second condenser. A blower does work on the gas by rotating the impeller, converting mechanical energy into gas kinetic energy and pressure energy to form a directional air flow. The first blower in this application is provided to introduce the gas pressurized by the first blower into the air inlet of the second condenser and increase the rate of the gas input into the second condenser.

[0011] Preferably, the first condenser, the second condenser and the evaporator are connected by a circulation assembly. The circulation assembly is provided to realize the circulation of the refrigerant among the first condenser, the second condenser and the evaporator.

[0012] Preferably, the circulation assembly includes a refrigeration compressor. The outlet of the refrigeration compressor is respectively connected to the first condenser and the second condenser. The liquid outlets of the first condenser and the second condenser are merged and communicated and then connected to the liquid inlet of the evaporator. The liquid outlet of the evaporator is connected to the liquid inlet of the refrigeration compressor. A pressure reducing unit is provided at the confluence of the liquid outlets of the first condenser and the second condenser. The pressure reducing unit is mainly used for throttling and reducing the pressure of the high-pressure refrigerant liquid, thereby ensuring the stability of the circulation assembly. After the low-pressure refrigerant gas is compressed by the refrigeration compressor, the obtained high-pressure refrigerant gas is divided into two paths. One path enters the first condenser to exchange heat with air and is cooled into a high-pressure refrigerant liquid, and the other path enters the second condenser to exchange heat with air and is cooled into a high-pressure refrigerant liquid. Then, after the high-pressure refrigerant liquids are merged and throttled and depressurized by the pressure reducing unit, the obtained low-temperature and low-pressure refrigerant wet steam enters the evaporator to exchange heat with air. After the low-pressure refrigerant liquid is completely vaporized, it enters the compressor to be compressed again, thus completing a cycle.

[0013] Preferably, a first flow valve is provided between the refrigeration compressor and the first condenser, and a second flow valve is provided between the refrigeration compressor and the second condenser. The main functions of the flow valve include flow control and system balance adjustment. The flow valve controls the flow rate by changing the flow area of the valve port or the length of the flow passage to ensure that the flow rate in the system remains at the set value, thereby automatically eliminating the phenomenon of hydraulic imbalance. The first flow valve and the second flow valve are provided to realize the balanced flow of the refrigerant in the circulation assembly. After the low-pressure refrigerant gas is compressed by the refrigeration compressor, the obtained high-pressure refrigerant gas is divided into two paths. One path passes through the second flow valve and enters the first condenser to exchange heat with air and is cooled into a high-pressure refrigerant liquid, and the other path passes through the first flow valve and enters the second condenser to exchange heat with air and is cooled into a high-pressure refrigerant liquid.

[0014] Preferably, the pressure reducing unit is an electromagnetic expansion valve. The functions of the electromagnetic expansion valve mainly include throttling and pressure reduction, controlling superheat, and regulating refrigerant flow. As a throttle valve, the electronic expansion valve can reduce the high-pressure refrigerant liquid from the condenser to a low-pressure liquid and send it into the evaporator. In this application, the electromagnetic expansion valve is used to throttle and reduce the pressure of the high-pressure refrigerant liquid because the electromagnetic expansion valve is driven by a stepper motor or a servo motor, which can achieve fine adjustment and precise control of the refrigerant flow. Compared with the traditional thermal expansion valve, the electronic expansion valve can more accurately respond to the changes in the requirements of the drying system and improve the overall performance of the drying system.

[0015] Preferably, a check valve I is provided between the condenser I and the electromagnetic expansion valve, and a check valve II is provided between the condenser II and the electromagnetic expansion valve. The high-pressure liquid then flows through the check valve I, and another path passes through the flow valve I and enters the condenser II to exchange heat with air and is cooled into a high-pressure refrigerant liquid. Then, after flowing through the check valve II and converging with the high-pressure refrigerant liquid flowing through the check valve I, it passes through the electromagnetic expansion valve for throttling and pressure reduction, and the obtained low-temperature and low-pressure refrigerant wet steam enters the evaporator to exchange heat with air. After the low-pressure refrigerant liquid is completely vaporized, it enters the compressor for re-compression, thus completing a cycle.

[0016] Advantages of the present invention: 1. When the drying system of this application dries the first half of the material, the humidity of the return air in the drying chamber is high, and the evaporator is used for condensation dehumidification. Not only is the dehumidification efficiency high, but also the latent heat of vaporization released by the condensation of water vapor is fully utilized, and more heat can be obtained at the high-temperature end of the heat pump for drying the material. When the water content in the material is greatly reduced and the difficulty of water analysis increases, the drying system dries the second half of the material at this time. The return air in the drying chamber is dehumidified by a dehumidification wheel. The dehumidification wheel has the advantage of deep dehumidification, and drier air with lower humidity can improve the drying rate of the second half of the material. At the same time, the driving energy of the regeneration zone on the dehumidification wheel makes full use of the outdoor air energy. Therefore, the system is more energy-saving and has great energy-saving potential. At the same time, by using the deep dehumidification of the dehumidification wheel, the drying quality of the material is effectively improved. That is, this application combines parts of the open drying system and the closed drying system through a clever design, gives full play to the advantages of the open drying system and the closed drying system, and combines the characteristics of the low-temperature regeneration wheel. It can not only achieve deep dehumidification and low regeneration temperature, but also ensure the high quality of material drying and improve the drying rate.

[0017] 2. The driving energy of the regeneration zone on the dehumidification wheel of this application makes full use of the outdoor air energy, so the system is more energy-saving and has great energy-saving potential.

[0018] 3. During preheating, this application can achieve rapid preheating by absorbing air energy, so that the drying system reaches a stable state.

[0019] 4. The present application utilizes the deep dehumidification technology of a dehumidification wheel. Therefore, on the premise of ensuring high-quality drying of materials, the drying rate of the system is also increased, the defect of long drying time in low-temperature drying is overcome, and the system is more energy-efficient.

[0020] 5. The present application uses the fresh air after dehumidification by the evaporator to regenerate the wheel, and the regeneration efficiency can be greatly improved. At the same time, by setting an air heat exchanger, the waste heat of the air discharged during the wheel regeneration process is fully recovered, and the system is more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the present invention.

[0023] In the figure: 1 is a dehumidification wheel, 2 is heat exchanger I, 3 is a refrigeration compressor, 4 is condenser I, 5 is condenser II, 6 is fan I, 7 is an evaporator, 8 is air valve I, 9 is heat exchanger II, 10 is fan II, 11 is a drying chamber, 12 is flow valve I, 13 is flow valve II, 14 is check valve I, 15 is check valve II, 16 is an electromagnetic expansion valve, 17 is air valve II, 18 is air valve III, 19 is air valve IV, 20 is air valve V, 21 is air valve VI, 22 is air valve VII. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0025] Embodiment 1, a heat pump coupled with a low-temperature regeneration rotary dehumidification opening and closing integrated drying system, as Figure 1As shown in the figure, it includes a dehumidification wheel 1, a heat exchanger I 2, a condenser I 4, a condenser II 5, an evaporator 7, a heat exchanger II 9, and a drying chamber 11 for drying materials; when the drying system is preheating, the return air of the drying chamber 11 flows through the heat exchanger II 9, the dehumidification area of the dehumidification wheel 1, the heat exchanger I 2, and the condenser I 4 in sequence and then returns to the air inlet of the drying chamber 11. At this time, the fresh air enters the evaporator 7 and the condenser II 5 in sequence and then is discharged into the atmosphere; when the drying system is drying the first half of the materials, the return air of the drying chamber 11 flows through the evaporator 7, the heat exchanger II 9, the dehumidification area of the dehumidification wheel 1, the heat exchanger I 2, and the condenser I 4 in sequence and then returns to the air inlet of the drying chamber 11; when the drying system is drying the second half of the materials, the return air of the drying chamber 11 flows through the heat exchanger II 9, the dehumidification area of the dehumidification wheel 1, and the condenser I 4 in sequence and then returns to the air inlet of the drying chamber 11. At this time, the fresh air enters the evaporator 7, the heat exchanger II 9, the condenser II 5, the regeneration area of the dehumidification wheel 1, and the heat exchanger I 2 in sequence and then is discharged into the atmosphere. When the drying system is drying the first half of the materials, the humidity of the return air in the drying chamber is high, and the evaporator 7 is used for condensation dehumidification. Not only is the dehumidification efficiency high, but also the latent heat of vaporization released by the condensation of water vapor is fully utilized, and more heat can be obtained at the high-temperature end of the heat pump for drying the materials; when the water content in the materials is greatly reduced and the difficulty of water analysis increases, at this time the drying system is drying the second half of the materials, and the return air of the drying chamber is dehumidified by the dehumidification wheel 1. The dehumidification wheel 1 has the advantage of deep dehumidification. The drier air with lower humidity can improve the drying rate of the second half of the materials. At the same time, the driving energy of the regeneration area on the dehumidification wheel 1 makes full use of the outdoor air energy. Therefore, the system is more energy-saving, has great energy-saving potential, and at the same time uses the deep dehumidification of the dehumidification wheel 1 to effectively improve the drying quality of the materials. That is, this application combines parts of an open drying system and a closed drying system through a clever design, gives full play to the advantages of the open drying system and the closed drying system, and combines the characteristics of a low-temperature regeneration runner. It can not only achieve deep dehumidification and low regeneration temperature, but also ensure high-quality material drying and improved drying rate. The drying system solves the technical problems of low drying quality or low drying rate when the existing drying system dries agricultural products.

[0026] The dehumidification wheel 8 is the dehumidification wheel on the rotary dehumidifier. The dehumidification wheel includes a treatment area and a regeneration area. The regeneration temperature of the dehumidification wheel 8 involved in this patent is generally in the range of 45°C - 70°C.

[0027] Embodiment 2, on the basis of Embodiment 1, a heat pump coupled with a low-temperature regeneration runner dehumidification open-close integrated drying system, as Figure 1As shown, the drying system is provided with air valves for controlling the flow direction on the circuits of preheating, the first half of material drying, and the second half of material drying. The setting of the air valves is to adjust the air flow direction on the circuits of preheating, the first half of material drying, and the second half of material drying in the drying system, thereby controlling the circuit in the preheating stage or the circuit in the first half of material drying stage or the circuit in the second half of material drying stage of the drying system, and realizing the adjustment of the circuits in the three stages.

[0028] The air valves include air valve I8, air valve II17, air valve III18, air valve IV19, air valve V20, air valve VI21 ​​and air valve VII22. When the drying system is preheated, the return air of the drying chamber 11 passes through the air valve III19, flows through the heat exchanger II9, then passes through the dehumidification zone of the dehumidification wheel 1, passes through the heat exchanger I2, and after being heated by the condenser I4, under the action of the fan 10, enters the drying chamber 11, and then proceeds to the next cycle. The wheel does not run in this process. The fresh air enters the evaporator 7 through the air valve VI21, passes through the air valve I8, enters the condenser II5 through the fan I6 after being cooled, and then is discharged into the atmosphere through the air valve VII22. The function of the step that the fresh air passes through the air valve VI21 ​​and enters the evaporator 7 is that the drying system absorbs the heat of the external fresh air through the evaporator 7. The heat of the circulating air in the drying chamber 17 comes from this. In this process, the condenser is not working and only serves as an air channel. During the operation of the system, air valve II 17, air valve III 18 and air valve V 20 are closed repeatedly until the air temperature in the drying chamber 11 reaches the set temperature, and the drying system enters the first half drying stage of the material; when the drying system performs the first half drying of the material, the high-humidity air return air from the drying chamber 11 passes through air valve V 20 and enters the evaporator 7 to cool and precipitate moisture, and the obtained low-temperature and low-humidity air passes through air valve III 18, and then flows through heat exchanger II 9 and dehumidification wheel 1 in sequence, and then passes through heat exchanger I 2 to enter condenser I 4 to be heated, and then the high-temperature and low-humidity air enters the drying chamber 11 under the action of fan II 10 to dry the material, thereby completing a cycle. During this process, air valve I8, air valve II17 and air valve VI21 ​​are closed, and the dehumidification wheel 1 does not work. When the moisture content of the material drops to a certain value, the drying system enters the second half of the material drying stage; when the drying system performs the second half of the material drying, the high-temperature humid air discharged from the drying chamber 11 passes through the air valve IV19, enters the heat exchanger II9, exchanges heat with the low-temperature air flowing through the heat exchanger II9, and after being cooled, enters the dehumidification area of ​​the dehumidification wheel 1 to be dehumidified, and the obtained low-humidity air enters the condenser I4 to be heated, and then enters the drying chamber 11 under the action of the fan II10 to dry the material. At the same time, the fresh air passes through the air valve VI 21 and enters the evaporator 7 to be cooled and dehumidified, then passes through the air valve II 17 and enters the heat exchanger II 9, exchanges heat with the high-temperature return air of the drying chamber 11 flowing through the heat exchanger II 9, and then passes through the fan I 6 to enter the condenser II 5 to be further heated and heated, and then enters the regeneration area of ​​the dehumidification wheel 1 to regenerate the failed dehumidification material, and then enters the heat exchanger I 2 to exchange heat with the low-temperature air flowing into the heat exchanger I 2, and then is discharged into the atmosphere after being cooled. During this process, the air valve I 8, the air valve III 18, the air valve V 20 and the air valve VII 22 are closed.

[0029] Example 3, based on Example 2, a heat pump coupled low temperature regeneration rotary dehumidification on-off integrated drying system, such as Figure 1As shown, both the heat exchanger Ⅰ2 and the heat exchanger Ⅱ9 are air-air heat exchangers. An air-air heat exchanger is a device that uses high-temperature air to exchange heat with low-temperature air through the heat exchanger to achieve heating or cooling effects. Among them, both the heat exchanger Ⅰ2 and the heat exchanger Ⅱ9 in this application are air-air heat exchangers, in order to fully recover the waste heat of the air discharged from the regeneration area of the dehumidification wheel 1 to the outside through the setting of the air heat exchanger in the drying system, thereby improving the energy efficiency of the drying system.

[0030] Example 4. On the basis of Example 3, a heat pump coupled with a low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system, as Figure 1 As shown, a fan Ⅱ1 is provided at the air inlet of the drying chamber 11, and the fan Ⅱ1 is located between the drying chamber 11 and the condenser Ⅰ4. A fan does work on the gas by rotating the impeller, converting mechanical energy into gas kinetic energy and pressure energy to form a directional air flow. The setting of the fan Ⅱ1 in this application is to introduce the high-temperature gas pressurized by the fan Ⅱ1 into the air inlet of the drying chamber 11 and increase the rate of the high-temperature gas input into the drying chamber 11.

[0031] Example 5. On the basis of Example 4, a heat pump coupled with a low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system, as Figure 1 As shown, a fan Ⅰ6 is provided at the air inlet of the condenser Ⅱ5. A fan does work on the gas by rotating the impeller, converting mechanical energy into gas kinetic energy and pressure energy to form a directional air flow. The setting of the fan Ⅰ6 in this application is to introduce the gas pressurized by the fan Ⅰ6 into the air inlet of the condenser Ⅱ5 and increase the rate of the gas input into the condenser Ⅱ5.

[0032] Example 6. On the basis of any one of Examples 1 to 5, a heat pump coupled with a low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system, as Figure 1 As shown, the condenser Ⅰ4, the condenser Ⅱ5 and the evaporator 7 are connected through a circulation component. The setting of the circulation component is to realize the cyclic flow of the refrigerant among the condenser Ⅰ4, the condenser Ⅱ5 and the evaporator 7.

[0033] Example 7. On the basis of Example 6, a heat pump coupled with a low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system, as Figure 1As shown in the figure, the cycle component includes a refrigeration compressor 3. The outlet of the refrigeration compressor 3 is respectively connected to a condenser I 4 and a condenser II 5. The liquid outlet of the condenser I 4 and the liquid outlet of the condenser II 5 are merged and communicated and then connected to the liquid inlet of an evaporator 7. The liquid outlet of the evaporator 7 is connected to the liquid inlet of the refrigeration compressor 3. A pressure reducing unit is provided at the confluence of the liquid outlet of the condenser I 4 and the liquid outlet of the condenser II 5. The pressure reducing unit is mainly used to throttle and reduce the pressure of the high-pressure refrigerant liquid, thereby ensuring the stability of the cycle component. After the low-pressure refrigerant gas is compressed by the refrigeration compressor 3, the obtained high-pressure refrigerant gas is divided into two paths. One path enters the condenser I 4 to exchange heat with air and is cooled into a high-pressure refrigerant liquid, and the other path enters the condenser II 5 to exchange heat with air and is cooled into a high-pressure refrigerant liquid. Then, after the high-pressure refrigerant liquids are merged and throttled and depressurized by the pressure reducing unit, the obtained low-temperature and low-pressure refrigerant wet steam enters the evaporator 7 to exchange heat with air. After the low-pressure refrigerant liquid is completely vaporized, it enters the compressor 3 to be compressed again, thus completing a cycle.

[0034] Example 8. On the basis of Example 7, a heat pump-coupled low-temperature regeneration rotary wheel dehumidification and opening / closing integrated drying system, as Figure 1 shown, a flow valve I 12 is provided between the refrigeration compressor 3 and the condenser I 4, and a flow valve II 13 is provided between the refrigeration compressor 3 and the condenser II 5. The main functions of the flow valve include flow control and system balance adjustment. The flow valve controls the flow rate by changing the flow area of the valve port or the length of the flow passage, ensuring that the flow rate in the system remains at the set value, thereby automatically eliminating the phenomenon of hydraulic imbalance. The settings of the flow valve I 12 and the flow valve II 13 are to achieve the balanced flow of the refrigerant in the cycle component. After the low-pressure refrigerant gas is compressed by the refrigeration compressor 3, the obtained high-pressure refrigerant gas is divided into two paths. One path passes through the flow valve II 13 and enters the condenser I 4 to exchange heat with air and is cooled into a high-pressure refrigerant liquid, and the other path passes through the flow valve I 12 and enters the condenser II 5 to exchange heat with air and is cooled into a high-pressure refrigerant liquid.

[0035] Example 9. On the basis of Example 8, a heat pump-coupled low-temperature regeneration rotary wheel dehumidification and opening / closing integrated drying system, as Figure 1 shown, the pressure reducing unit is an electromagnetic expansion valve 16. The functions of the electromagnetic expansion valve 16 mainly include throttling and reducing pressure, controlling superheat, and regulating refrigerant flow rate. As a throttle valve, the electronic expansion valve 16 can reduce the high-pressure refrigerant liquid from the condenser to a low-pressure liquid and send it into the evaporator. In this application, the electromagnetic expansion valve 16 is used to throttle and reduce the pressure of the high-pressure refrigerant liquid because the electromagnetic expansion valve 16 is driven by a stepper motor or a servo motor, which can achieve fine adjustment and precise control of the refrigerant flow rate. Compared with the traditional thermal expansion valve, the electronic expansion valve 16 can respond more accurately to the changes in the drying system requirements and improve the overall performance of the drying system.

[0036] Example 10. On the basis of Example 9, a heat pump coupled with a low-temperature regeneration rotary dehumidification on-off integrated drying system, as Figure 1 shown, a check valve I 14 is provided between the condenser I 4 and the electromagnetic expansion valve 16, and a check valve II 15 is provided between the condenser II 5 and the electromagnetic expansion valve 16. The high-pressure liquid then flows through the check valve I 14, and another path passes through the flow valve I 12 and enters the condenser II 5 to exchange heat with air and is cooled into a high-pressure refrigerant liquid, and then flows through the check valve II 15 and converges with the high-pressure refrigerant liquid flowing through the check valve I 14. After throttling and depressurizing through the electromagnetic expansion valve 16, the obtained low-temperature and low-pressure refrigerant wet steam enters the evaporator 7 to exchange heat with air. After the low-pressure refrigerant liquid is completely vaporized, it enters the compressor 3 for re-compression, thus completing a cycle.

[0037] When Example 10 is implemented, the operation of the drying system of the present application can be divided into three stages. The first stage is the rapid preheating stage, the second stage is the first half of the material drying (closed mode), and the third stage is the second half of the material drying (open mode). In the first stage, the rapid preheating stage of the system, the return air of the drying chamber 11 passes through the air valve III 19, flows through the heat exchanger II 9, then passes through the dehumidification zone of the dehumidification rotor 1, and then passes through the heat exchanger I 2. After being heated by the condenser I 4, under the action of the fan 10, it enters the drying chamber 11, and then proceeds to the next cycle. During this process, the rotor does not operate. The fresh air enters the evaporator 7 through the air valve VI 21, is cooled and then passes through the air valve I 8, enters the condenser II 5 through the fan I 6, and then is discharged into the atmosphere through the air valve VII 22. During the operation of the system, the air valves II 17, III 18, and V 20 are closed. This process is repeated until the air temperature in the drying chamber 11 reaches the set temperature, and the system enters the second stage, the first half of the material drying (closed mode). The high-humidity air return in the drying chamber 11 enters the evaporator 7 through the air valve V 20 and is cooled to precipitate moisture. The obtained low-temperature and low-moisture-content air passes through the air valve III 18, then successively flows through the heat exchanger II 9 and the dehumidification rotor 1, and then enters the condenser I 4 through the heat exchanger I 2 and is heated. Then, the high-temperature and low-humidity air enters the drying chamber 11 under the action of the fan II 10 to dry the material, thus completing a cycle. During this process, the air valves I 8, II 17, and VI 21 are closed, and the dehumidification rotor 1 does not work. When the moisture content of the material drops to a certain value, the system enters the third stage, the second half of the material drying (open mode). The high-temperature and wet air discharged from the drying chamber 11 passes through the air valve IV 19, enters the heat exchanger II 9, exchanges heat with the low-temperature air flowing through the heat exchanger II 9, is cooled and then enters the dehumidification zone of the dehumidification rotor 1 to be dehumidified. The obtained low-moisture-content air enters the condenser I 4 and is heated, and then enters the drying chamber 11 under the action of the fan II 10 to dry the material. At the same time, the fresh air enters the evaporator 7 through the air valve VI 21, is cooled and dehumidified, then enters the heat exchanger II 9 through the air valve II 17, exchanges heat with the high-temperature return air of the drying chamber 11 flowing through the heat exchanger II 9, is heated and raised in temperature, then enters the condenser II 5 through the fan I 6 and is further heated and raised in temperature, and then enters the regeneration zone of the dehumidification rotor 1. After regenerating the ineffective dehumidification material, it enters the heat exchanger I 2, exchanges heat with the low-temperature air flowing into the heat exchanger I 2, is cooled, and then is discharged into the atmosphere. During this process, the air valves I 8, III 18, V 20, and VII 22 are closed.

[0038] Circulation of refrigerant within the circulation component: The low-pressure refrigerant gas is compressed by the refrigeration compressor 3, and the obtained high-pressure refrigerant gas is divided into two paths. One path passes through the flow valve II 13 and enters the condenser I 4 to exchange heat with air and is cooled into a high-pressure liquid, and then flows through the check valve I 14. The other path passes through the flow valve I 12 and enters the condenser II 5 to exchange heat with air and is cooled into a high-pressure liquid, and then flows through the check valve II 15. After converging with the high-pressure liquid refrigerant flowing through the check valve I 14, it passes through the electromagnetic expansion valve 16 for throttling and pressure reduction, and the obtained low-temperature and low-pressure refrigerant wet steam enters the evaporator 7 to exchange heat with air. After the low-pressure liquid refrigerant is completely vaporized, it enters the compressor 3 for re-compression, thus completing a cycle. When the system is in the rapid preheating stage, the flow valve I 12 and the flow valve II 13 are opened; when the system is in the first half of the material drying (closed mode), the flow valve I 12 is closed and the flow valve II 13 is opened; when the second half of the material drying (open mode), the flow valve I 12 and the flow valve II 13 are opened.

[0039] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heat pump coupled with a low-temperature regeneration rotary dehumidification integrated opening and closing drying system, characterized in that, It includes a dehumidification rotor (1), a heat exchanger I (2), a condenser I (4), a condenser II (5), an evaporator (7), a heat exchanger II (9), and a drying chamber (11) for drying materials; when the drying system is preheating, the return air of the drying chamber (11) flows through the heat exchanger II (9), the dehumidification zone of the dehumidification rotor (1), the heat exchanger I (2), and the condenser I (4) in sequence and then returns to the air inlet of the drying chamber (11). At this time, the fresh air enters the evaporator (7) and the condenser II (5) in sequence and then is discharged into the atmosphere; when the drying system is drying the first half of the materials, the return air of the drying chamber (11) flows through the evaporator (7), the heat exchanger II (9), the dehumidification zone of the dehumidification rotor (1), the heat exchanger I (2), and the condenser I (4) in sequence and then returns to the air inlet of the drying chamber (11); when the drying system is drying the second half of the materials, the return air of the drying chamber (11) flows through the heat exchanger II (9), the dehumidification zone of the dehumidification rotor (1), and the condenser I (4) in sequence and then returns to the air inlet of the drying chamber (11). At this time, the fresh air enters the evaporator (7), the heat exchanger II (9), the condenser II (5), the regeneration zone of the dehumidification rotor (1), and the heat exchanger I (2) in sequence and then is discharged into the atmosphere.

2. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system according to claim 1, wherein: The drying system is provided with air valves for controlling the flow direction on the return air paths during preheating, the first half of the material drying, and the second half of the material drying.

3. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system according to claim 2, wherein: Both the heat exchanger I (2) and the heat exchanger II (9) are air-air heat exchangers.

4. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification on-off integrated drying system according to claim 3, characterized in that: A fan II (10) is provided at the air inlet of the drying chamber (11), and the fan II (10) is located between the drying chamber (11) and the condenser I (4).

5. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification on-off integrated drying system according to claim 4, characterized in that: A fan I (6) is provided at the air inlet of the condenser II (5).

6. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system according to any one of claims 1 to 5, characterized in that: The condenser I (4), the condenser II (5), and the evaporator (7) are connected through a circulation assembly.

7. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification on-off integrated drying system according to claim 6, wherein: The circulation assembly includes a refrigeration compressor (3). The outlet of the refrigeration compressor (3) is respectively connected to the condenser I (4) and the condenser II (5). The liquid outlet of the condenser I (4) and the liquid outlet of the condenser II (5) are converged and communicated and then connected to the liquid inlet of the evaporator (7). The liquid outlet of the evaporator (7) is connected to the liquid inlet of the refrigeration compressor (3). A pressure reduction unit is provided at the confluence of the liquid outlet of the condenser I (4) and the liquid outlet of the condenser II (5).

8. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification opening and closing integrated drying system according to claim 7, wherein: A flow valve I (12) is provided between the refrigeration compressor (3) and the condenser I (4), and a flow valve II (13) is provided between the refrigeration compressor (3) and the condenser II (5).

9. The heat pump-coupled low-temperature regeneration rotary dehumidification on-off integrated drying system according to claim 8, wherein: The pressure reduction unit is an electromagnetic expansion valve (16).

10. The heat pump-coupled low-temperature regeneration rotary wheel dehumidification on-off integrated drying system according to claim 9, characterized in that: A check valve I (14) is provided between the condenser I (4) and the electromagnetic expansion valve (16), and a check valve II (15) is provided between the condenser II (5) and the electromagnetic expansion valve (16).

Images