A heat pump partition drying system with multi-stage regenerative dehumidification

Abstract

The present invention relates to the technical field of heat pump drying, and particularly refers to a heat pump zoning drying system with multi-stage regenerative dehumidification. In the present invention, three drying zones are formed by multiple conveying devices, multiple partition plates, and in combination with the first condenser of the heat pump zoning system, the second condenser, the first regenerative dehumidifier and the second regenerative dehumidifier in the multi-stage regenerative dehumidification system. The continuous dehydration effect during the drying and dehumidification process is achieved through the first regenerative dehumidifier, the second regenerative dehumidifier and the evaporator, realizing the effect of zoning drying. At the same time, the air dehumidification or dehydration is realized through the multi-stage regenerative dehumidification structure. Through the heat pump zoning system and the multi-stage regenerative dehumidification system, the present invention continuously increases the air temperature and reduces the air humidity during the dehumidification process, and can solve the problems of continuously accumulating moisture and low temperature in the air during the dehumidification process.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump drying, and particularly refers to a heat pump partition drying system with multi-stage regenerative dehumidification. Background Art

[0002] Among numerous drying technologies, the drying technology adopted by the heat pump drying system is widely used in the field of drying and dehumidification due to its high dehumidification capacity. A traditional heat pump drying system usually uses a single condenser as a high-temperature heat source to heat dry air for drying wet materials such as crops in a drying chamber; during the dehumidification process, the humidity of the high-temperature dry air gradually increases and gradually evolves into medium-temperature and high-humidity air, resulting in a gradual decrease in the air dehumidification capacity in the middle and later stages, thereby reducing the dehumidification efficiency.

[0003] The dehumidification process is a complex heat and mass transfer process, and temperature and humidity are important factors affecting dehumidification. In order to obtain long-term and high-efficient dehumidification capacity in a heat pump drying system, it is necessary to keep the dry air at a high temperature and low humidity for a long time. However, using a high-temperature time controller for dehumidification will conversely increase the humidity of the air and reduce the temperature, thereby inhibiting the dehumidification process. Summary of the Invention

[0004] The invention purpose of the present invention is: to solve the problems existing in the prior art, the present invention provides a heat pump partition drying system with multi-stage regenerative dehumidification.

[0005] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0006] A heat pump partition drying system with multi-stage regenerative dehumidification includes a drying chamber, and also includes a multi-stage regenerative dehumidification system and a heat pump partition system;

[0007] The heat pump partition system includes a plurality of fans, as well as a compressor and a condenser connected to each other;

[0008] The multi-stage regenerative dehumidification system includes a regenerative dehumidifier;

[0009] The drying chamber is divided into a plurality of mutually independent gas flow regions, and the front end of each gas flow region is provided with the fan, and a corresponding gas circulation flow path is formed in each region; the plurality of gas flow regions are arranged from top to bottom, and a regenerative dehumidifier is arranged between two adjacent gas flow regions up and down;

[0010] The upper part of the drying chamber is provided with a wet material inlet, and a material conveying channel is formed in the drying chamber, and the wet material is sequentially conveyed through a plurality of gas flow regions through the material conveying channel;

[0011] The heat pump zoning system is arranged on one side of the drying chamber, and the condenser is arranged at the front end of the material conveying channel.

[0012] As an improvement to the technical solution of the heat pump zoning drying system with multi-stage regenerative dehumidification of the present invention, the drying chamber includes a plurality of conveying devices and a plurality of partition plates. The plurality of conveying devices are arranged in parallel from top to bottom, and the drying chamber is divided into a plurality of independent gas flow regions by the plurality of conveying devices and the plurality of partition plates.

[0013] As an improvement to the technical solution of the heat pump zoning drying system with multi-stage regenerative dehumidification of the present invention, each of the conveying devices includes at least three rotating shafts. The at least three rotating shafts are arranged side by side and have a certain distance from each other, and a conveyor belt is wound around the outside of the at least three rotating shafts;

[0014] The conveyor belt is arranged outside the at least three rotating shafts in a non-tightened manner.

[0015] As an improvement to the technical solution of the heat pump zoning drying system with multi-stage regenerative dehumidification of the present invention, the drying chamber includes a plurality of the conveying devices;

[0016] The plurality of conveying devices include a plurality of conveying devices on odd floors and a plurality of conveying devices on even floors. Among the plurality of conveying devices on odd floors, the end of the conveying device on the odd floor is placed above the front end of the conveying device on the even floor; the end of the conveying device on the even floor is arranged above the front end of the next conveying device on the odd floor;

[0017] And a partition plate is arranged at the front end of the conveying device on the even floor. Both sides of the partition plate are respectively connected to the conveying device on the even floor and the inner wall of the drying chamber. The front end of the uppermost conveying device is arranged below the wet material inlet.

[0018] As an improvement to the technical solution of the heat pump zoning drying system with multi-stage regenerative dehumidification of the present invention, the multi-stage regenerative dehumidification system includes a first regenerative dehumidifier and a second regenerative dehumidifier;

[0019] The drying chamber includes at least five of the conveying devices. The drying chamber is divided into three gas flow regions, namely a first region, a second region, and a third region;

[0020] The first regenerative dehumidifier is arranged between the first region and the second region; the second regenerative dehumidifier is arranged between the second region and the third region.

[0021] As an improvement to the technical solution of the heat pump zoned drying system with multi-stage regenerative dehumidification of the present invention, a deflector is provided above each of the conveying devices, and the inclination direction of the deflector is the same as the direction of gas flow.

[0022] As an improvement to the technical solution of the heat pump zoned drying system with multi-stage regenerative dehumidification of the present invention, the regenerative dehumidifier is a partition wall type cross-flow heat exchanger.

[0023] As an improvement to the technical solution of the heat pump zoned drying system with multi-stage regenerative dehumidification of the present invention, the heat pump zoned system further includes an evaporator and a throttle valve; the condenser includes a first condenser and a second condenser; the compressor is connected to the first condenser, the second condenser, the throttle valve, and the evaporator in sequence through pipelines, and the evaporator is connected to the compressor.

[0024] Advantages of the present invention:

[0025] In the present invention, three drying zones are formed by multiple conveying devices and multiple partition plates, in combination with the first condenser and the second condenser of the heat pump zoned system and the first regenerative dehumidifier and the second regenerative dehumidifier in the multi-stage regenerative dehumidification system. And the effects of continuous dehydration during the drying and dehumidification process are achieved through the first regenerative dehumidifier, the second regenerative dehumidifier, and the evaporator, realizing the effect of zoned drying, and at the same time realizing air water removal or dehydration through the multi-stage regenerative dehumidification structure; through the heat pump zoned system and the multi-stage regenerative dehumidification system of the present invention, the air temperature is continuously increased and the air humidity is reduced during the dehumidification process, and the problems of continuously accumulating moisture and low temperature in the air during the dehumidification process can be solved. Description of the Drawings

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the heat pump zoned system in the present invention;

[0028] Figure 3 It is a structural schematic diagram of a conveyor belt in the prior art;

[0029] Figure 4 It is a structural schematic diagram of the conveyor belt in the present invention.

[0030] Description of reference numerals: 1 - compressor; 2 - evaporator; 3 - throttle valve; 4 - first condenser; 5 - second condenser; 6 - first fan; 7 - second fan; 8 - third fan; 9 - fourth fan; 10 - first regenerative dehumidifier; 11 - second regenerative dehumidifier; 12 - first drain pipe; 13 - second drain pipe; 14 - third drain pipe; 15 - filter screen; 16 - water receiving tray; 17 - first conveyor belt; 18 - first gas circulation flow path; 19 - second gas circulation flow path; 20 - third gas circulation flow path; 21 - partition board; 22 - guide plate; 23 - wet material inlet; 24 - crawler conveyor belt; 25 – rotating shaft. Detailed implementation manners

[0031] To make the invention objectives, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] As Figure 1 and Figure 2 shown, a heat pump partition drying system with multi-stage regenerative dehumidification includes a drying chamber, a multi-stage regenerative dehumidification system and a heat pump partition system.

[0033] The drying chamber is used for drying wet materials, and the drying chamber is divided into multiple independent areas; the heat pump partition system is used to provide hot air for the drying chamber and drive the air flow in each area; the multi-stage regenerative dehumidification system is used to realize the gas flow in multiple independent areas and achieve the effect of partition dehumidification. The three cooperate with each other to solve the problem of poor dehumidification effect of the heat pump drying system existing in the prior art.

[0034] In the present invention, the heat pump partition system includes multiple fans, a compressor 1 and a condenser, where the compressor 1 and the condenser are connected to each other. The multi-stage regenerative dehumidification system includes a regenerative dehumidifier. The drying chamber is divided into multiple independent gas flow areas, and a fan is arranged at the front end of each gas flow area to form a corresponding gas circulation flow path in each area; the multiple gas flow areas are arranged from top to bottom, and a regenerative dehumidifier is arranged between two adjacent gas flow areas up and down.

[0035] A wet material inlet 23 is arranged at the upper part of the drying chamber, a material conveying channel is formed in the drying chamber, and the wet materials are sequentially conveyed through multiple gas flow channels through the material conveying channel; the heat pump partition system is arranged on one side of the drying chamber, and the condenser is arranged at the front end of the material conveying channel.

[0036] Preferably, the regenerative dehumidifier is a partitioned cross-flow heat exchanger.

[0037] Furthermore, the heat pump zoning system includes a compressor 1, an evaporator 2, and a throttle valve 3; the condenser includes a first condenser 4 and a second condenser 5; the compressor 1 is connected to the first condenser 4, the second condenser 5, the throttle valve 3, and the evaporator 2 in sequence through pipelines, and the evaporator 2 is connected to the compressor 1.

[0038] In some embodiments of the present invention, the drying chamber includes a plurality of conveying devices and a plurality of partition plates 21. The plurality of conveying devices are arranged in parallel from top to bottom. The drying chamber is divided into a plurality of independent gas flow regions by the plurality of conveying devices and the plurality of partition plates 21.

[0039] Furthermore, a deflector plate 22 is provided above each conveying device, and the inclination direction of the deflector plate 22 is the same as the gas flow direction.

[0040] In some embodiments of the present invention, each conveying device includes at least two rotating shafts 25. A conveyor belt is provided outside the at least two rotating shafts 25, and the conveyor belt is arranged to surround and cover the outside of the plurality of rotating shafts 25. That is, each conveying device is a crawler conveyor belt 24, and each crawler conveyor belt 24 is arranged outside the at least two rotating shafts 25 in a non-tight manner.

[0041] In some embodiments of the present invention, the drying chamber includes a plurality of conveying devices; the plurality of conveying devices include a plurality of odd-layer conveying devices and a plurality of even-layer conveying devices. Among the plurality of odd-layer conveying devices, the end of the odd-layer conveying device is placed above the front end of the even-layer conveying device; the end of the even-layer conveying device is arranged above the front end of the next odd-layer conveying device; and a partition plate 21 is provided at the front end of the even-layer conveying device. Both sides of the partition plate 21 are connected to the even-layer conveying device and the inner wall of the drying chamber respectively, and the front end of the uppermost conveying device is arranged below the wet material inlet 23.

[0042] In some embodiments of the present invention, the multi-stage regenerative dehumidification system includes a first regenerative dehumidifier 10 and a second regenerative dehumidifier 11; the drying chamber includes at least five conveying devices, and the drying chamber is divided into three gas flow regions, namely a first region, a second region, and a third region; a first regenerative dehumidifier 10 is provided between the first region and the second region; a second regenerative dehumidifier 11 is provided between the second region and the third region.

[0043] As an embodiment of the present invention, the present invention will now be described in detail in conjunction with Figures 1 to 4 for a detailed description of the present invention.

[0044] The heat pump zoning system includes a compressor 1, an evaporator 2, a throttle valve 3, a condenser, and multiple fans. The condenser includes a first condenser 4 and a second condenser 5. Compared with the second condenser 5, the first condenser 4 is a high-temperature condenser, and the second condenser 5 is a low-temperature condenser.

[0045] The multi-stage regenerative dehumidification system includes a regenerative dehumidifier. Among them, the regenerative dehumidifier includes a first regenerative dehumidifier 10 and a second regenerative dehumidifier 11. Compared with the second regenerative dehumidifier 11, the first regenerative dehumidifier 10 is a high-temperature stage regenerative dehumidifier, and the second regenerative dehumidifier 11 is a low-temperature stage regenerative dehumidifier.

[0046] In the drying chamber, five conveyor devices and multiple partition plates 21 form three gas flow regions for the gas flow space in the drying chamber. The three gas flow regions are arranged from top to bottom in the drying chamber, and the three gas flow regions are independent of each other. The three gas flow regions are the first region, the second region, and the third region respectively. A first regenerative dehumidifier 10 and a second regenerative dehumidifier 11 are arranged between the first region and the second region. The heat pump zoning system includes three fans, which are the first fan 6, the second fan 7, and the third fan 8. The first fan 6, the second fan 7, and the third fan 8 are respectively arranged at the front ends of the first region, the second region, and the third region.

[0047] As Figure 1 shown, the heat pump zoning system is arranged on one side of the drying chamber. The compressor 1, the evaporator 2, the first condenser 4, the second condenser 5, and the throttle valve 3 are connected by pipelines, and the throttle valve 3 is also connected to the above-mentioned compressor 1. The pipeline is a hollow metal pipeline, preferably a hollow copper pipe, which ensures its heat conduction effect. A heat pump working medium is filled in the pipeline.

[0048] The multi-heat regenerative dehumidification system includes a first regenerative dehumidifier 10 and a second regenerative dehumidifier 11.

[0049] A wet material inlet 23 is arranged at the upper part of the drying chamber to facilitate the entry of wet materials into the drying chamber.

[0050] Five conveyor devices are arranged from top to bottom in the drying chamber. The five conveyor devices are arranged in a layered manner, and each conveyor device is arranged along the length direction of the drying chamber. The first condenser 4 mentioned above is arranged at the front end of the uppermost conveyor device, and the wet material inlet 23 is arranged above the uppermost conveyor device.

[0051] The multiple conveying devices include multiple odd-layer conveying devices and multiple even-layer conveying devices. The ends of the multiple odd-layer conveying devices are placed above the front ends of the even-layer conveying devices. The ends of the even-layer conveying devices are arranged above the front ends of the next odd-layer conveying devices. And a partition plate 21 is provided at the end of the even-layer conveying device. The two sides of the partition plate 21 are respectively connected to the even-layer conveying device and the inner wall of the drying chamber. Among them, the conveying device is used to achieve the effect of conveying wet materials.

[0052] To optimize the structure of the present invention, the compressor 1 is arranged at the lowermost part. The compressor 1 is arranged below one side of the first condenser 4. The second condenser 5 is arranged below the other side of the first condenser 4. An evaporator 2 is arranged below the second condenser 5. And a throttle valve 3 is arranged between the evaporator 2 and the second condenser 5. The compressor 1 is arranged behind the compressor 1.

[0053] Taking the embodiment as an example, the five conveying devices include a first conveying device, a second conveying device, a third conveying device, a fourth conveying device and a fifth conveying device arranged successively from top to bottom. The first conveying device, the third conveying device and the fifth conveying device are odd-layer conveying devices. The second conveying device and the fourth conveying device are even-layer conveying devices. The partition plate 21 described above is provided at the front ends of the second conveying device and the fourth conveying device. The two sides of the partition plate 21 are respectively connected to the even-layer conveying device and the inner side wall of the drying chamber.

[0054] That is, when the materials enter the drying chamber from the wet material inlet 23, they are conveyed in the material conveying channels formed in the drying chamber. Among them, the wet materials follow the first conveying device, are conveyed from the front end of the first conveying device to the rear end of the first conveying device, and then fall to the front end of the second conveying device. Then, as the second conveying device operates, they reach the end of the second conveying device and fall onto the front end of the third conveying device at the end of the second conveying device; and so on.

[0055] Among them, the partition plate 21 is provided at the front ends of the second conveying device and the fourth conveying device. Through the second conveying device and its corresponding partition plate 21, and the fourth conveying device and its corresponding partition plate 21, at least three independent regions are formed in the drying chamber, namely a first region, a second region and a third region. The first gas circulation flow path 18, the second gas circulation flow path 19 and the third gas circulation flow path 20 are correspondingly arranged in the first region, the second region and the third region.

[0056] The flow paths of the first gas circulation flow path 18, the second gas circulation flow path 19 and the third gas circulation flow path 20 are as Figure 1As shown, the gas in the first gas circulation flow path 18, under the action of the first fan 6, flows through the first condenser 4, then bypasses the first conveying device, and enters the first regenerative dehumidifier, and then passes through the first condenser 4 again; the gas in the second gas circulation flow path 19, under the action of the second fan 7, flows through the first regenerative dehumidifier 10, bypasses the third conveying device, then enters the second regenerative dehumidifier 11, and returns to the first regenerative dehumidifier 10. The gas in the third gas circulation flow path 20, under the action of the third fan 8, passes through the second regenerative dehumidifier 11, bypasses the fifth conveying device, then passes through the second condenser 5, and returns to the second regenerative dehumidifier 11.

[0057] Since the first regenerative dehumidifier 10 and the second regenerative dehumidifier 11 are partition wall type cross converters, they can realize heat exchange and mutual mixing of two airflows.

[0058] Therefore, in the present invention, since three mutually independent regions are formed in the drying chamber, and a gas circulation flow path is correspondingly formed in each region; when in use, it is used in combination with a condenser and a regenerative dehumidifier, achieving a partition drying effect of multi-stage regenerative dehumidification. In this way, it can avoid the problem in the prior art that using a high-temperature time controller for dehumidification will instead increase the humidity of the air and lower the temperature, thereby inhibiting the dehumidification process.

[0059] Specifically, comparing the gas temperatures in the first gas circulation flow path 18, the second gas circulation flow path 19, and the third gas circulation flow path 20, the temperature of the first gas circulation flow path 18 is the highest, the temperature of the second gas circulation flow path 19 is the second highest, and the temperature of the gas in the third gas circulation flow path 20 is the lowest. Therefore, the trajectory through which the gas in the first gas circulation flow path 18 flows is the high-temperature drying section, the trajectory through which the gas in the second gas circulation flow path 19 flows is the medium-temperature drying section, and the trajectory through which the gas in the third gas circulation flow path 20 flows is the low-temperature drying section. The first condenser 4 and the first fan 6 provide high-temperature air for the first gas circulation flow path 18 in the high-temperature drying section; the second condenser 5 and the third fan 8 provide high-temperature air for the third gas circulation flow path 20 in the low-temperature drying section. The flow directions of the first gas circulation flow path 18, the second gas circulation flow path 19, and the third gas circulation flow path 20 are as Figure 1 shown.

[0060] The drying chamber is divided into a high-temperature drying section, a medium-temperature drying section, and a low-temperature drying section by the conveying device and the partition plate 21, realizing the drying effect of the air in different drying sections.

[0061] The drying heat source for the heat pump zoning system. The first condenser 4 and the second condenser 5 respectively correspond to the high-temperature drying section and the low-temperature drying section. The drying heat source for the medium-temperature drying section comes from the first regenerative dehumidifier 10 recovering the waste heat of the gas in the first gas circulation path 18 in the high-temperature drying section. The waste heat heats the air in the second gas circulation path 19, achieving energy transfer and the effects of dehydration and dehumidification.

[0062] That is, in the present invention, three drying zones are formed through multiple conveying devices and multiple partition plates 21, in combination with the first condenser 4 and the second condenser 5 of the heat pump zoning system and the first regenerative dehumidifier 10 and the second regenerative dehumidifier 11 in the multi-stage regenerative dehumidification system. And the continuous dehydration effect during the drying and dehumidification process is achieved through the first regenerative dehumidifier 10, the second regenerative dehumidifier 11, and the evaporator 2.

[0063] During the dehumidification process of the first regenerative dehumidifier 10, the relatively high-temperature wet air on the high-temperature side of the first regenerative dehumidifier 10 is cooled by the relatively low-temperature dry air from its low-temperature side. The high-temperature wet air is cooled to the dew point temperature, thus achieving condensation dehumidification.

[0064] During the dehumidification process of the second regenerative dehumidifier 11, the low-temperature wet air on the high-temperature side of the second regenerative dehumidifier 11 is much higher in temperature than the dry air on the low-temperature side. Because the low-temperature dry air on the low-temperature side comes from the low-temperature evaporator 2, making it have a lower temperature, the low-temperature wet air on the high-temperature side of the second regenerative dehumidifier 11 will be cooled, thus achieving condensation dehumidification.

[0065] During the dehumidification process of the evaporator 2, by utilizing the low-temperature characteristics of the evaporator 2 in the heat pump zoning system, the water vapor in the low-temperature wet air undergoing heat and mass exchange in the low-temperature drying section can be effectively condensed into liquid water, thus achieving further dehumidification.

[0066] Among them, the first condenser 4 and the second condenser 5 are distinguished according to the different states of the condenser working medium. High-temperature working medium steam mainly exists in the first condenser 4, while high-temperature steam mixture or liquid working medium mainly exists in the second condenser 5.

[0067] To reduce the occupied space of the present invention, the heat pump zoning drying system with multi-stage regenerative dehumidification optimizes the positions of its various components.

[0068] The first regenerative dehumidifier 10 is arranged directly below the first condenser 4. The first regenerative dehumidifier 10 is used for heat exchange and dehumidification between the gas in the first gas circulation path 18 and the gas in the second gas circulation path 19. And a first drain pipe 12 is provided at the bottom of the first regenerative dehumidifier 10 for discharging the condensed water in the first regenerative dehumidifier 10.

[0069] The second heat and humidity dehumidifier 11 is arranged below the first heat and humidity dehumidifier 10. A second condenser 5 and a third blower 8 are provided at the low-temperature side outlet of the second heat and humidity dehumidifier 11. Under the action of the second condenser 5 and the third blower 8, the effect of heating low-temperature dry air can be achieved. And a second drain pipe 13 is arranged at the bottom of the second heat and humidity dehumidifier 11 for discharging the condensed water in the second heat and humidity dehumidifier 11.

[0070] The evaporator 2 is arranged below the second heat and humidity dehumidifier 11. The evaporator 2 is used for low-temperature dehumidification to remove the moisture in the air in the third gas circulation path 20. A fourth blower 9 is arranged at the inlet of the evaporator 2, and a filter screen 15 is arranged in front of the fourth blower 9. The dust is filtered through the filter screen 15 to prevent the dust from entering the evaporator 2, avoiding the situation of reducing the dehumidification and heat exchange efficiency.

[0071] A water receiving tray 16 is arranged below the evaporator 2, and a third drain pipe 14 is arranged at the bottom of the water receiving tray. The water receiving tray 16 is used for collecting the liquid generated during the operation of the evaporator 2, and the liquid in the water receiving tray 16 can be discharged through the third drain pipe 14.

[0072] As Figure 3 shown, in the prior art, the conveyor belts 17 are all tightly arranged outside the rotating shafts 25. When conveying materials, the materials are smoothly conveyed on the conveyor belts 17. In the present invention, as Figure 4 shown, each conveying device includes at least three rotating shafts 25. The at least three rotating shafts 25 are arranged in parallel and have a certain distance from each other. The crawler conveyor belt 24 is wound around and covers the outside of the at least three rotating shafts 25; the crawler conveyor belt 24 is arranged outside the at least three rotating shafts 25 in a non-tight manner. Since the conveying device is a loose crawler conveyor belt 24, the wet materials can be turned over through the deformation of the crawler conveyor belt 24, making it easier for the high-temperature air to be sent into the inner layer of the wet materials, accelerating the dehumidification and improving the dehumidification efficiency.

[0073] Specifically, if Figure 4As shown in the figure, the conveying device includes at least three rotating shafts 25. The at least three rotating shafts 25 are arranged in parallel and have a certain distance from each other. The two outer rotating shafts 25 are used for the steering of the crawler belt conveyor 24. At least one rotating shaft 25 between those two rotating shafts 25 is in contact with the crawler belt conveyor 24 on both outer sides, achieving the effect of contacting and conveying materials. At the same time, in the present invention, when conveying materials through the crawler belt conveyor 24, since at least one rotating shaft 25 is also provided between the two outer rotating shafts 25 and the crawler belt conveyor 24 is arranged non-tightly, the crawler belt conveyor 24 between adjacent two rotating shafts 25 can be recessed downward. When the materials are continuously conveyed, the rotating shaft 25 in the middle will protrude relative to the crawler belt conveyor 24, thereby turning the edges of the materials, and / or the materials will protrude when passing through the roller and crack, that is, the inner layer of the materials is turned out, making it easier for high-temperature air to be sent into the inner layer of the wet materials, accelerating dehumidification and improving the dehumidification efficiency.

[0074] Furthermore, a deflector 22 is provided above each conveying device. The inclination direction of the deflector 22 is the same as the direction of gas flow. By guiding the flow direction of the air through the deflector 22, the air is directly guided to the surface of the wet materials, making it easier for the air to come into contact with the materials and better achieving the drying effect.

[0075] When the present invention is drying, the pipeline in the heat pump zoning system is filled with a heat pump working medium. When the compressor 1 starts, the heat pump working medium is compressed by the compressor 1 into high-temperature working medium steam and is transported to the first condenser 4. The gas in the first gas circulation flow path 18 is driven by the first fan 6 and exchanges heat with the high-temperature working medium steam in the first condenser 4. The gas in the first gas circulation flow path 18 is heated into high-temperature dry air.

[0076] At this time, the high-temperature working medium is cooled into a slightly lower-temperature gas-liquid mixture or liquid working medium and is transported to the second condenser 5 and is used to heat the air in the third gas circulation flow path 20. At this time, the original high-temperature working medium is cooled into a working medium with a degree of supercooling, that is, a refrigerating working medium.

[0077] The refrigerating working medium is throttled by the throttle valve 3, and a low-temperature and low-pressure gas-liquid mixture working medium flows into the evaporator 2, which is used to cool the air in the third gas circulation flow path 20 and achieve the effect of condensation and dehumidification.

[0078] In the high-temperature drying section, the air in the first gas circulation flow path 18 exchanges heat through the first condenser 4. This air is heated into high-temperature dry air and is transported to the first conveying device under the drive of the first fan 6 and descends under the action of the deflector 22, so that the high-temperature dry air blows towards the surface of the wet materials. At the same time, by including a non-tight crawler belt conveyor 24, the edges of the wet materials are turned, and combined with the action of the deflector 22, it makes it easier for the high-temperature dry air to penetrate into the inner layer of the wet materials, thereby improving the dehumidification efficiency.

[0079] After the high-temperature dry air in the first gas circulation flow path 18 exchanges heat with the wet material in the high-temperature drying section, it becomes high-temperature and high-humidity air. The high-temperature wet air passes through the high-temperature side of the first regenerative dehumidifier 10 and exchanges heat with the low-temperature dry air on the low-temperature side of the first regenerative dehumidifier 10.

[0080] Since the first regenerative dehumidifier 10 can achieve heat exchange between two air streams without mixing with each other, under the action of the first regenerative dehumidifier 10, the heat carried by the high-temperature wet air in the first gas circulation flow path 18 on its high-temperature side will be transferred to the low-temperature dry air in the second gas circulation flow path 19. Furthermore, the low-temperature dry air in the second gas circulation flow path 19 is heated into high-temperature dry air and is used for drying in the medium-temperature drying section under the drive of the second fan 7. However, the high-temperature wet air on the high-temperature side of the first regenerative dehumidifier 10 is cooled into low-temperature air, and the water vapor in the low-temperature air is condensed into liquid water and discharged through the first drain pipe 12. At this time, the air in the first gas circulation flow path 18 passes through the first regenerative dehumidifier 10 and will flow back to the first condenser 4 under the action of the heat pump partition system.

[0081] The high-temperature dry air is used for drying in the medium-temperature drying section under the drive of the second fan 7. This high-temperature dry air corresponds to the air in the second gas circulation flow path 19. The high-temperature dry air is driven by the second fan 7 and, under the action of the guide plate 22 and the crawler conveyor 24, conducts efficient heat and mass transfer, thereby achieving the effect of efficient dehumidification. The wet material in the medium-temperature drying section is dried into wet material with low water content.

[0082] The high-temperature dry air in the second gas circulation flow path 19 exchanges heat and mass with the wet material in the medium-temperature drying section and then becomes low-temperature wet air, which flows into the high-temperature side of the second regenerative dehumidifier 11.

[0083] In the second regenerative dehumidifier 11, the temperature of the gas in the high-temperature side of the second gas circulation flow path 19 is much lower than the temperature of the gas in the third gas circulation flow path 20 on the low-temperature side. Therefore, the wet air on the high-temperature side of the second regenerative dehumidifier 11 is cooled and condensed into liquid water, which can be discharged through the second drain pipe 13.

[0084] In the second regenerative dehumidifier 11, the air in the high-temperature side of the second gas circulation flow path 19 is cooled into low-temperature dry air and discharged, and flows to the low-temperature side of the first regenerative dehumidifier 10. It is heated by the high-temperature wet air on the high-temperature side of the first regenerative dehumidifier 10 and is then used again for drying and dehumidification in the medium-temperature drying section.

[0085] The air in the third gas circulation flow path 20 flows out from the low-temperature side in the second regenerative dehumidifier 11 and will be heated by the second condenser 5 into high-temperature dry air. Driven by the third fan 8, it performs heat and mass exchange with the low-moisture wet material in the low-temperature drying section. And under the action of the deflector 22 and the crawler conveyor 24, the effect of high-efficiency dehumidification is further realized. Finally, the low-moisture wet material can be dried into dry material.

[0086] The air in the third gas circulation flow path 20 becomes low-temperature wet air after dehumidification in the low-temperature drying section, is blown towards the evaporator 2 under the drive of the fourth fan 9, and the dust in the air is filtered out through the filter screen 15.

[0087] Since the temperature of the low-temperature working fluid in the evaporator 2 is very low, it can effectively cool the low-temperature and high-humidity air in the third gas circulation flow path 20. The water vapor in the air is condensed into liquid water, collected by the water receiving tray 16, and discharged through the third drain pipe 14. Finally, the low-temperature and high-humidity air becomes low-temperature and low-humidity air.

[0088] The low-temperature and low-humidity air in the third gas circulation flow path 20 discharged from the evaporator 2 will be sent to the low-temperature side of the second regenerative dehumidifier 11 and heat exchange will occur in the second regenerative dehumidifier 11. On the high-temperature side of the second regenerative dehumidifier 11, the low-temperature wet air will be cooled and a certain dehumidification process mentioned above will be realized again. This dehumidification process is: in the second regenerative dehumidifier 11, the temperature of the gas in the second gas circulation flow path 19 on the high-temperature side is much lower than the temperature of the gas in the third gas circulation flow path 20 on the low-temperature side. Therefore, the wet air on the high-temperature side of the second regenerative dehumidifier 11 will be cooled and the liquid water will be condensed out, which can be discharged through the second drain pipe 13.

[0089] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. A heat pump partition drying system with multi-stage regenerative dehumidification, including a drying chamber, characterized in that, It also includes a multi-stage regenerative dehumidification system and a heat pump zoning system; The heat pump zoning system includes a plurality of fans, as well as a compressor and a condenser connected to each other; The multi-stage regenerative dehumidification system includes a regenerative dehumidifier; The drying chamber is divided into a plurality of independent gas flow regions, and the front end of each gas flow region is provided with the fan, and a corresponding gas circulation flow path is formed in each region; the plurality of gas flow regions are arranged from top to bottom, and the regenerative dehumidifier is arranged between two adjacent gas flow regions above and below; A wet material inlet is arranged at the upper part of the drying chamber, and a material conveying channel is formed in the drying chamber, and the wet material is sequentially conveyed through the plurality of gas flow regions through the material conveying channel; The heat pump zoning system is arranged on one side of the drying chamber, and the condenser is arranged at the front end of the material conveying channel; The drying chamber includes a plurality of conveying devices and a plurality of partition plates. The plurality of conveying devices are arranged in parallel from top to bottom, and the drying chamber is divided into a plurality of independent gas flow regions by the plurality of conveying devices and the plurality of partition plates; The drying chamber includes a plurality of the conveying devices; The plurality of conveying devices include a plurality of conveying devices on odd floors and a plurality of conveying devices on even floors. The end of the conveying device on the odd floor is placed above the front end of the conveying device on the even floor; the end of the conveying device on the even floor is arranged above the front end of the next conveying device on the odd floor; And the front end of the conveying device on the even floor is provided with the partition plate, and both sides of the partition plate are respectively connected to the conveying device on the even floor and the inner wall of the drying chamber, and the front end of the uppermost conveying device is arranged below the wet material inlet; The regenerative dehumidifier is a partition wall type cross-flow heat exchanger; the heat pump zoning system also includes an evaporator and a throttle valve; the condenser includes a first condenser and a second condenser; the compressor is connected to the first condenser, the second condenser, the throttle valve and the evaporator in sequence through pipelines, and the evaporator is connected to the compressor.

2. The heat pump zoning drying system with multi-stage regenerative dehumidification according to claim 1, wherein Each of the conveying devices includes at least three rotating shafts, and the at least three rotating shafts are arranged in parallel and have a certain distance from each other, and a conveyor belt surrounds and covers the outside of the at least three rotating shafts; The conveyor belt is arranged outside the at least three rotating shafts in a non-tightened manner.

3. The heat pump zoning drying system with multi-stage regenerative dehumidification according to claim 1, characterized in that, The multi-stage regenerative dehumidification system includes a first regenerative dehumidifier and a second regenerative dehumidifier; The drying chamber includes at least five of the conveying devices, and the drying chamber is divided into three gas flow regions, and the three gas flow regions are a first region, a second region and a third region respectively; The first regenerative dehumidifier is arranged between the first region and the second region; the second regenerative dehumidifier is arranged between the second region and the third region.

4. The heat pump zoned drying system with multi-stage regenerative dehumidification according to claim 1, wherein A deflector is arranged above each of the conveying devices, and the inclination direction of the deflector is the same as the direction of the gas flow.

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