CN220602085U - A multi-stage heat recovery and dehumidification heat pump zoned drying system - Google Patents

Abstract

The utility model relates to the technical field of heat pump drying, in particular to a heat pump partition drying system with multistage backheating and dehumidification functions. In the utility model, three drying areas are formed by combining a plurality of conveying devices and a plurality of partition plates with a first condenser, a second condenser of a heat pump partition system and a first regenerative dehumidifier and a second regenerative dehumidifier of a multi-stage regenerative dehumidification system. The continuous dehydration effect in the drying and dehumidifying process is realized through the first regenerative dehumidifier, the second regenerative dehumidifier and the evaporator, the partition drying effect is realized, and meanwhile, the air dewatering or dehydration is realized through the multi-stage regenerative and dehumidifying structure; according to the utility model, through the heat pump partition system and the multistage regenerative dehumidification system, the air temperature is continuously increased and the air humidity is reduced in the dehumidification process, so that the problems of moisture and low temperature which are continuously accumulated in the air in the dehumidification process can be solved.

Description

A multi-stage heat recovery and dehumidification heat pump zoned drying system

Technical field

The utility model relates to the technical field of heat pump drying, in particular to a heat pump zoned drying system with multi-stage heat recovery and dehumidification.

Background technique

Among the many drying technologies, the drying technology used in the heat pump drying system is widely used in the field of drying and dehumidification due to its high dehumidification capacity. Traditional heat pump drying systems usually use a single condenser as a high-temperature heat source. The heated dry air is used in the drying bin to dry crops and other wet materials. During the dehumidification process, the humidity of the high-temperature dry air gradually increases and gradually evolves into medium temperature and high humidity. air, causing the air dehumidification capacity to gradually decrease in the middle and late stages, thereby reducing the dehumidification efficiency.

The dehumidification process is a complex heat and mass transfer process. Temperature and humidity are important factors affecting dehumidification. To obtain long-term and efficient dehumidification capabilities in a heat pump drying system, the dry air must be kept at high temperature and low humidity for a long time. However, using a high-temperature timer for dehumidification will in turn increase the humidity of the air and lower the temperature, thereby inhibiting the dehumidification process.

Utility model content

The purpose of the invention is: in order to solve the problems existing in the prior art, the utility model provides a multi-stage heat pump zoned drying system with heat recovery and dehumidification.

In order to solve the problems existing in the prior art, the utility model adopts the following technical solutions:

A multi-stage heat recovery dehumidification heat pump zoning drying system, including a drying chamber, a multi-stage heat recovery dehumidification system and a heat pump zoning system;

The heat pump zoning system includes multiple fans, as well as interconnected compressors and condensers;

The multi-stage heat recovery dehumidification system includes a heat recovery dehumidifier;

The drying chamber is divided into a plurality of mutually independent gas flow areas, the front end of each gas flow area is equipped with the fan, and a corresponding gas circulation flow path is formed in each of the areas; a plurality of the The gas flow area is arranged from top to bottom, and the regenerative dehumidifier is arranged between two adjacent gas flow areas.

A wet material inlet is provided at the upper part of the drying chamber, a material conveying channel is formed in the drying chamber, and the wet material is sequentially transported through a plurality of the gas flow areas 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.

As an improvement of the technical solution of the multi-stage heat recovery and dehumidification heat pump zoned drying system of the present invention, the drying chamber includes multiple conveyors and multiple partition boards, and the multiple conveyors are arranged in parallel from top to bottom, so The drying chamber is divided into a plurality of mutually independent gas flow areas through a plurality of the conveying devices and a plurality of partition plates.

As an improvement of the technical solution of the multi-stage heat recovery dehumidification heat pump zoned drying system of the present invention, each of the transmission devices includes at least three rotating shafts, and the at least three rotating shafts are arranged side by side with a certain distance between them. The conveyor belt surrounds and covers the outside of at least three of the rotating shafts;

The conveyor belt is arranged non-tightly on the outside of at least three of the rotating shafts.

As an improvement of the technical solution of the multi-stage heat recovery and dehumidification heat pump zoned drying system of the present invention, the drying chamber includes a plurality of the conveying devices, and the front end of the uppermost conveying device is arranged at the entrance of the wet material. below; below

The plurality of conveying devices includes a plurality of odd-numbered layer conveying devices and a plurality of even-numbered layer conveying devices, a plurality of odd-numbered layer conveying devices; the ends of the odd-numbered layer conveying devices are placed on the even-numbered layer conveying devices. above the front end of the conveyor device of the even-numbered layer; the end of the conveyor device of the even-numbered layer is arranged above the front end of the conveyor device of the next odd-numbered layer;

And the partition plate is arranged in front of the even-numbered layer conveying device, and both sides of the partition plate are respectively connected to the even-numbered layer conveying device and the inner wall of the drying chamber.

As an improvement of the technical solution of the multi-stage heat recovery dehumidification heat pump zoned drying system of the present invention, the multi-stage heat recovery dehumidification system includes a first heat recovery dehumidifier and a second heat recovery dehumidifier;

The drying chamber includes at least five conveying devices, and the drying chamber is divided into three gas flow areas, and the three gas flow areas are respectively a first area, a second area and a third area;

The first regenerative dehumidifier is disposed between the first region and the second region; the second regenerative dehumidifier is disposed between the second region and the third region.

As an improvement of the technical solution of the multi-stage heat recovery and dehumidification heat pump zoned drying system of the present invention, a guide plate is provided above each conveying device, and the inclination direction of the guide plate is in line with the direction of the gas flow. Same direction.

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

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

Beneficial effects of this utility model:

In the present utility model, multiple transmission devices and multiple partition boards are used, combined with the first condenser and the second condenser of the heat pump partition system and the first regenerative dehumidifier and the second regenerative dehumidifier in the multi-stage regenerative dehumidification system. The regenerative dehumidifier forms three drying zones. And through the first recuperation dehumidifier, the second recuperation dehumidifier and the evaporator, the effect of continuous dehydration in the drying and dehumidification process is achieved, and the effect of zoned drying is achieved. At the same time, the air is dewatered through the multi-stage recuperation dehumidification structure. Or dehydration; this utility model uses a heat pump zoning system and a multi-stage heat recovery dehumidification system to continuously increase the air temperature and reduce the air humidity during the dehumidification process, and can solve the problem of moisture and low temperature continuously accumulating in the air during the dehumidification process.

Description of the drawings

Figure 1 is a schematic structural diagram of the utility model;

Figure 2 is a schematic diagram of the heat pump zoning system in the present utility model;

Figure 3 is a schematic structural diagram of a conveyor belt in the prior art;

Figure 4 is a schematic structural diagram of the conveyor belt in the present utility model.

Explanation of reference signs: 1-compressor; 2-evaporator; 3-throttle valve; 4-first condenser; 5-second condenser; 6-first fan; 7-second fan; 8-th Three fans; 9-the fourth fan; 10-the first regenerative dehumidifier; 11-the second regenerative dehumidifier; 12-the first drainage pipe; 13-the second drainage pipe; 14-the third drainage pipe; 15- Filter; 16-water tray; 17-first conveyor belt; 18-first gas circulation path; 19-second gas circulation path; 20-third gas circulation path; 21-partition plate; 22-guide Flow plate; 23-wet material inlet; 24-crawler conveyor belt; 25-rotating shaft.

Detailed ways

In order to make the invention purpose, technical solutions and beneficial effects of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the description The embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

As shown in Figures 1 and 2, a multi-stage heat recovery dehumidification heat pump zoned drying system includes a drying chamber, a multi-stage heat recovery dehumidification system and a heat pump zone system.

The drying room is used to dry wet materials, and the drying room is divided into multiple independent areas; the heat pump zoning system is used to provide hot air to the drying room and drive the air flow in each area; the multi-stage heat recovery dehumidification system is used to achieve The gas flows in multiple independent areas and achieves the effect of zoned dehumidification. The three cooperate with each other and combine the problem of poor dehumidification effect of the heat pump drying system existing in the existing technology.

In the present utility model, the heat pump zone system includes multiple fans, compressors 1 and condensers, where the compressors 1 and the condensers are connected to each other. The multi-stage heat recovery dehumidification system includes a heat recovery dehumidifier. The drying chamber is divided into multiple independent gas flow areas. The front end of each gas flow area is equipped with a fan to form a corresponding gas circulation path in each area; multiple gas flow areas are arranged from top to bottom, with upper and lower A recuperative dehumidifier is provided between two adjacent gas flow areas.

The upper part of the drying chamber is provided with a wet material inlet 23, and a material conveying channel is formed in the drying chamber. The wet material is sequentially transported 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 on the material conveying channel. The front end of the channel.

Preferably, the recuperative dehumidifier is a dividing wall cross-flow heat exchanger.

Further, the heat pump zone 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 and the first condenser 4 through pipelines. The second condenser 5 is connected to the throttle valve 3 , and the throttle valve 3 is connected to the compressor 1 .

In some embodiments of the present invention, the drying chamber includes multiple conveying devices and multiple partitioning plates 21. The multiple conveying devices are arranged in parallel from top to bottom. The drying chamber is divided into multiple conveying devices and multiple partitioning plates 21. independent gas flow areas.

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

In some embodiments of the present invention, each conveyor device includes at least two rotating shafts 25 , and conveyor belts are provided on the outsides of at least two rotating shafts 25 . The conveyor belts are arranged around and covering the outsides of multiple rotating shafts 25 . That is, each conveying device is a crawler conveyor belt 24 , and each crawler conveyor belt 24 is non-tightly arranged outside at least two rotating shafts 25 .

In some embodiments of the present invention, the drying chamber includes multiple conveying devices, and the front end of the uppermost conveying device is disposed below the wet material inlet 23; the multiple conveying devices include multiple odd-numbered conveying devices and multiple conveying devices. Even-numbered layer conveyor devices, multiple odd-numbered layer conveyor devices; the end of the odd-numbered layer conveyor device is placed above the front end of the even-numbered layer conveyor device; the end of the even-numbered layer conveyor device is set at the front end of the next odd-numbered layer conveyor device above; and the end of the even-numbered layer conveying device is provided with a partition plate 21, and both sides of the partition plate 21 are respectively connected to the even-numbered layer conveying device and the inner wall of the drying chamber.

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 flows. area, the three gas flow areas are the first area, the second area and the third area respectively; the first regenerative dehumidifier 10 is provided between the first area and the second area; the first regenerative dehumidifier 10 is provided between the second area and the third area. There is a second heat dehumidifier 11.

As an embodiment of the present utility model, the present utility model will be described in detail with reference to FIGS. 1 to 4 .

The heat pump zone 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, and the first condenser 4 and the second Compared with the condenser 5, the first condenser 4 is a high-temperature condenser, and the second condenser 5 is a low-temperature condenser.

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

In the drying chamber, five conveying devices and multiple partition boards 21 form the gas flow space in the drying chamber into three gas flow areas. The three gas flow areas are arranged from top to bottom in the drying chamber, and the three gas flow areas Independent. The three gas flow areas are respectively the first area, the second area and the third area. A first regenerative dehumidifier 10 and a second regenerative dehumidifier 11 are provided between the first area and the second area. The heat pump zoning system includes three fans. The three fans are a first fan 6, a second fan 7 and a third fan 8. The first fan 6, the second fan 7 and the third fan 8 are respectively arranged in the first area and the third area. The front end of the second and third areas.

As shown in Figure 1, the heat pump partition system is installed on one side of the drying room. The compressor 1, evaporator 2, first condenser 4, second condenser 5 and throttle valve 3 are connected through pipelines, and the throttle valve 3 is also connected to the above-mentioned compressor 1. The pipe is a hollow metal pipe, preferably a hollow copper pipe, to ensure its heat conduction effect. The heat pump working fluid is injected into the pipe.

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

The upper part of the drying chamber is provided with a wet material inlet 23 to facilitate wet materials entering the drying chamber.

There are five conveying devices arranged in the drying chamber from top to bottom. The five conveying devices are arranged in layers. Each conveying device is arranged along the length direction of the drying chamber. The front end of the uppermost conveying device is equipped with the above-mentioned first condenser 4. , and the wet material inlet 23 is arranged above the uppermost conveying device.

The plurality of conveying devices includes a plurality of odd-numbered layer conveying devices and a plurality of even-numbered layer conveying devices, the plurality of odd-numbered layer conveying devices; the end of the odd-numbered layer conveying device is placed above the front end of the even-numbered layer conveying device; the even-numbered layer The end of the conveying device of the next odd-numbered layer is arranged above the front end of the conveying device of the next odd-numbered layer; and the end of the conveying device of the even-numbered layer is provided with a partition plate 21, and both sides of the partition plate 21 are respectively connected with the conveying device of the even-numbered layer and the drying chamber. The inner walls are connected. The conveying device is used to achieve the effect of conveying wet materials.

In order to optimize the structure of the present utility model, the compressor 1 is arranged at the bottom, 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, and the An evaporator 2 is provided below the second condenser 5 , and a throttle valve 3 is provided between the evaporator 2 and the second condenser 5 . The compressor 1 is provided behind the compressor 1 .

According to the embodiment, 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 in sequence from top to bottom. The first conveying device, the third conveying device and the fifth conveying device are conveying devices of odd-numbered layers, and the second conveying device and the fourth conveying device are conveying devices of even-numbered layers. The front ends of the second conveying device and the fourth conveying device are provided with the above-mentioned partition plate 21, and both sides of the partition plate 21 are respectively connected to the even-numbered layer conveying devices and the inner walls of the drying chamber.

That is, after the material enters the drying chamber from the wet material inlet 23, it is transported through the new material conveying channel in the drying chamber. Among them, the wet material is transported along the first conveying device from the front end of the first conveying device to the rear end of the first conveying device, and then falls to the front end of the second conveying device, and then as the second conveying device operates, Reaching the end of the second conveyor, drop to the front end of the third conveyor at the end of the second conveyor; and so on.

Among them, the front ends of the second conveying device and the fourth conveying device are provided with partition plates 21. Through the second conveying device and its corresponding partition plate 21, and the fourth conveying device and its corresponding partition plate 21, at least one is formed in the drying chamber. Three mutually independent areas are respectively the first area, the second area and the third area. The first area, the second area and the third area are each provided with a first gas circulation flow path 18 and a second gas circulation flow path. path 19 and the third gas circulation path 20.

The flow paths of the first gas circulation channel 18 , the second gas circulation channel 19 and the third gas circulation channel 20 are as shown in FIG. 1 . The gas in the first gas circulation channel 18 is blown by the first fan 6 , flows through the first condenser 4, then bypasses the first conveying device, enters the first regenerative dehumidification, and passes through the first condenser 4 again; the gas in the second gas circulation path 19 is circulated in the second fan 7 Under the action of , the flow passes through the first regenerative dehumidifier 10 , and bypasses the third conveying device, then enters the second regenerative dehumidifier 11 , and returns to the first regenerative dehumidifier 10 . Under the action of the third fan 8, the gas in the third gas circulation path 20 passes through the second regenerative dehumidifier 11, bypasses the fifth conveying device, then passes through the second condenser 5, and returns to the second recuperation device. Thermal Dehumidifier 11.

Since the first regenerative dehumidifier 10 and the second regenerative dehumidifier 11 are partition-type cross-converters, the two air flows can exchange heat and mix with each other.

Therefore, in the present utility model, three mutually independent areas are formed in the drying chamber, and a gas circulation flow path is formed in each area; when used, it is used with a condenser and a heat recovery dehumidifier to achieve multi-stage recirculation. The zonal drying effect of thermal dehumidification can avoid the problem in the existing technology that using a high-temperature timer to dehumidify will in turn increase the humidity of the air and lower the temperature, thereby inhibiting the dehumidification process.

In detail, compared with the gas temperatures in the first gas circulation channel 18 , the second gas circulation channel 19 and the third gas circulation channel 20 , the temperature of the first gas circulation channel 18 is the highest, and the temperature of the second gas circulation channel is the highest. The temperature of the path 19 is second, and the temperature of the gas in the third gas circulation path 20 is the lowest. Therefore, the trajectory that the gas in the first gas circulation channel 18 flows through is the high-temperature drying section, the trajectory that the gas in the second gas circulation channel 19 flows through is the medium-temperature drying section, and the trajectory in the third gas circulation channel 20 The path the gas flows through is the low-temperature drying section. The first condenser 4 and the first fan 6 provide high-temperature air for the first gas circulation path 18 of the high-temperature drying section; the second condenser 5 and the third fan 8 provide high-temperature air for the third gas circulation path 20 of the low-temperature drying section. Air. The flow directions of the first gas circulation channel 18 , the second gas circulation channel 19 and the third gas circulation channel 20 are as shown in FIG. 1 .

The drying chamber is divided into a high-temperature drying section, a medium-temperature drying section and a low-temperature drying section through the conveying device and the partition plate 21 to achieve the drying effect of the air in different drying sections.

Used as the drying heat source in the heat pump zoning system, the first condenser 4 and the second condenser 5 correspond to the high-temperature drying section and the low-temperature drying section respectively, and the drying heat source of the medium-temperature drying section comes from the first heat recovery dehumidifier 10. The residual heat of the gas in the first gas circulation channel 18 in the high-temperature drying section heats the air in the second gas circulation channel 19 to achieve energy transfer and dehydration and dehumidification effects.

That is, in the present utility model, through multiple transmission devices and multiple partition boards 21, combined with the first condenser 4, the second condenser 5 of the heat pump partition system and the first heat recovery dehumidification in the multi-stage heat recovery dehumidification system The dehumidifier 10 and the second regenerative dehumidifier 11 form three drying zones. And through the first regenerative dehumidifier 10, the second regenerative dehumidifier 11 and the evaporator 2, the effect of continuous dehydration in the drying and dehumidification process is achieved.

During the dehumidification process of the first regenerative dehumidifier 10, the relatively high-temperature moist air on the high-temperature side of the first regenerative dehumidifier 10 is cooled by the relatively low-temperature dry air from the low-temperature side of the first regenerative dehumidifier 10. The high temperature and humid air is cooled to the dew point temperature, thereby achieving condensation dehumidification.

During the dehumidification process of the second regenerative dehumidifier 11, the temperature of the low-temperature humid air on the high-temperature side of the second regenerative dehumidifier 11 is much higher than the temperature of 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 humid air on the high-temperature side of the second regenerative dehumidifier 11 will be cooled, thereby achieving condensation dehumidification.

During the dehumidification process of the evaporator 2, the low-temperature characteristics of the evaporator 2 in the heat pump zone system can be used to effectively condense the water vapor in the low-temperature humid air exchanged in the low-temperature drying section into liquid water, thereby achieving further Dehumidify.

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

In order to reduce the space occupied by the utility model, the multi-stage heat recovery and dehumidification heat pump zoned drying system of the utility model optimizes the position of each component.

The first regenerative dehumidifier 10 is disposed directly below the first condenser 4. The first regenerative dehumidifier 10 is used to heat the gas in the first gas circulation flow path 18 and the gas in the second gas circulation flow path 19. Exchange and dehumidify. And a first drainage pipe 12 is provided at the bottom of the first regenerative dehumidifier 10 for draining the condensed water in the first regenerative dehumidifier 10 .

The second regenerative dehumidifier 11 is arranged below the first regenerative dehumidifier 10. The low-temperature side outlet of the second regenerative dehumidifier 11 is provided with a second condenser 5 and a third fan 8. Between the second condenser 5 and Under the action of the third fan 8, the effect of heating low-temperature dry air can be achieved. And a second drainage pipe 13 is provided at the bottom of the second regenerative dehumidifier 11 for draining the condensed water in the second regenerative dehumidifier 11 .

The evaporator 2 is disposed below the second regenerative dehumidifier 11 . The evaporator 2 is used for low-temperature dehumidification and removes air moisture in the third gas circulation flow path 20 . A fourth fan 9 is provided at the entrance of the evaporator 2. A filter 15 is provided in front of the fourth fan 9. Dust is filtered through the filter 15 to prevent dust from entering the evaporator 2 and avoid reducing dehumidification and replacement. Thermal efficiency situation arises.

A water receiving pan 16 is provided below the evaporator 2, and a third drainage pipe 14 is provided at the bottom of the water receiving pan. The water receiving pan 16 is used to collect liquid generated by the evaporator 2 during operation, and can pass through the third drainage pipe 14Drain the liquid in the drain pan 16.

As shown in FIG. 3 , the conveyor belt 17 in the prior art is tightly arranged on the outside of the rotating shaft 25 . When materials are transported, the materials are smoothly transported on the conveyor belt 17 . In the present utility model, as shown in Figure 4, each conveyor device includes at least three rotating shafts 25. The at least three rotating shafts 25 are arranged side by side with a certain distance between them. The crawler conveyor belt 24 is wrapped around at least three rotating shafts 25. The outside of the rotating shaft 25; the crawler conveyor belt 24 is arranged non-tightly on the outside of at least three rotating shafts 25. Since the conveying device is a loose crawler conveyor belt 24, the wet material can be flanged through the deformation of the crawler conveyor belt 24, making it easier for high-temperature air to be sent into the inner layer of the wet material, speeding up dehumidification and improving dehumidification efficiency.

In detail, as shown in Figure 4, the transmission device includes at least three rotating shafts 25. The at least three rotating shafts 25 are arranged side by side with a certain distance from each other. The two outer rotating shafts 25 are used for steering the crawler conveyor belt 24. The two outer sides of at least one rotating shaft 25 placed between the two rotating shafts 25 are in contact with the crawler conveyor belt 24 to achieve the effect of contacting and transmitting materials; at the same time, in the present utility model, when the material is transmitted through the crawler conveyor belt 24 At this time, since there is at least one rotating shaft 25 between the two outer rotating shafts 25 and the crawler conveyor belt 24 is arranged non-tightly, the crawler conveyor belt 24 between the two adjacent rotating shafts 25 can be made concave downwards. When the material continues to be conveyed, the rotating shaft 25 placed in the middle will protrude relative to the crawler conveyor belt 24, thereby flanging the material, and/or the material will protrude and crack when passing through the roller, that is, the inner layer of the material will be turned out. It makes it easier for high-temperature air to be sent into the inner layer of wet materials, speeding up dehumidification and improving dehumidification efficiency.

Furthermore, a guide plate 22 is provided above each conveying device. The inclination direction of the guide plate 22 is the same as the direction of gas flow. The guide plate 22 guides the flow direction of the air and guides the air directly to the wet room. The surface of the material makes it easier for the air to contact the material and better achieves the drying effect.

When the utility model is drying, the pipes in the heat pump partition system are filled with heat pump working fluid. When the compressor 1 starts, the heat pump working fluid is compressed by the compressor 1 into high-temperature working fluid vapor and transported to the first condenser 4 , the gas in the first gas circulation channel 18 is driven by the first fan 6 to exchange heat with the high-temperature working fluid steam in the first condenser 4, and the gas in the first gas circulation channel 18 is heated to a high temperature. dry air.

At this time, the high-temperature working fluid is cooled into a slightly low-temperature gas-liquid mixture or liquid working fluid, and is transported to the second condenser 5 and used to heat the air in the third gas circulation channel 20 . At this time, the original high-temperature working fluid is cooled into a working fluid with a degree of subcooling, that is, a refrigeration working fluid.

The refrigerant working fluid is throttled by the throttle valve 3, and the gas-liquid mixed working fluid generated at low temperature and low pressure flows into the evaporator 2, and is used to cool the air in the third gas circulation flow path 20 and achieve the effect of condensation and dehumidification.

In the high-temperature drying section, the air in the first gas circulation path 18 undergoes heat exchange through the first condenser 4. The air is heated into high-temperature dry air and is transported to the first conveying device driven by the first fan 6. , and descends under the action of the guide plate 22, so that high-temperature dry air blows to the surface of the wet material. At the same time, by including a non-tight crawler conveyor belt 24, the wet material is flanged, and combined with the function of the deflector 22, the high-temperature dry air can more easily penetrate into the inner layer of the wet material, thereby improving the dehumidification efficiency.

After the high-temperature dry air in the first gas circulation 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 humid air passes through the high-temperature side of the first regenerative dehumidifier 10 and interacts with the third The low-temperature dry air on the low-temperature side of the primary reheating dehumidifier 10 performs heat exchange.

Since the first regenerative dehumidifier 10 can realize heat exchange between the two streams of air without mixing with each other, under the action of the first regenerative dehumidifier 10, the high-temperature humid air in the first gas circulation path 18 on the high-temperature side is carried The heat will be transferred to the low-temperature dry air in the second gas circulation path 19. Furthermore, the low-temperature dry air in the second gas circulation path 19 is heated into high-temperature dry air, and is used for drying in the medium-temperature drying section driven by the second fan 7 . However, the high-temperature humid 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 drained away through the first drain pipe 12 . At this time, the air in the first gas circulation path 18 passes through the first recuperative dehumidifier 10 and flows back to the first condenser 4 again under the action of the heat pump zoning system.

The high-temperature dry air is used for drying in the medium-temperature drying section driven by the second fan 7 , and this high-temperature dry air corresponds to the air in the second gas circulation path 19 . The high-temperature dry air is driven by the second fan 7 and under the action of the deflector 22 and the crawler conveyor belt 24 to perform efficient heat and mass exchange, thereby achieving an efficient dehumidification effect. The wet materials in the medium temperature drying section will be dried into wet materials with low moisture content.

The high-temperature dry air in the second gas circulation path 19 undergoes heat and mass exchange with the wet material in the medium-temperature drying section and becomes low-temperature wet air, and flows into the high-temperature side of the second regenerative dehumidifier 11 .

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

In the second regenerative dehumidifier 11 , the air in the second gas circulation path 19 on the high temperature side is cooled and discharged into low temperature dry air, and flows to the low temperature side of the first regenerative dehumidifier 10 . The high-temperature humid air on the high-temperature side in the first reheating dehumidifier 10 is heated, and after being heated, it is used again for drying and dehumidification in the medium-temperature drying section.

The air in the third gas circulation path 20 flows out from the low temperature side of 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 is dried with low temperature The wet material with low moisture content in the section carries out heat and mass exchange. And under the action of the guide plate 22 and the crawler conveyor belt 24, the effect of efficient dehumidification is further achieved, and finally the wet material with low moisture content can be dried into dry material.

The air in the third gas circulation path 20 is dehumidified in the low-temperature drying section and becomes low-temperature humid air. It is blown to the evaporator 2 driven by the fourth fan 9, and is filtered out of the air through the filter 15. dust.

Since the temperature of the low-temperature working fluid in the evaporator 2 is very low, the low-temperature and high-humidity air in the third gas circulation path 20 can be effectively cooled. The water vapor in the air is condensed into liquid water and is transferred to the water receiving tray 16 Collect and drain away through the third drainage pipe 14, and finally the low-temperature and high-humidity air becomes low-temperature and low-humidity air.

The low-temperature and low-humidity air discharged from the third gas circulation channel 20 through the evaporator 2 will be sent to the low-temperature side of the second recuperative dehumidifier 11 , and will be heat exchanged in the second regenerative dehumidifier 11 . In the high-temperature side of the second regenerative dehumidifier 11, the low-temperature humid air will be cooled, and a certain dehumidification process mentioned above will be re-implemented. The dehumidification process is: in the second regenerative dehumidifier 11, the second high-temperature side The temperature of the gas in the gas circulation channel 19 is much lower than the temperature of the gas in the third gas circulation channel 20 on the low temperature side. Therefore, the humid air on the high temperature side of the second regenerative dehumidifier 11 will be cooled and condensed into liquid water, which can be discharged through the second drain pipe 13 .

Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

Claims (8)

1. A multi-stage heat recovery dehumidification heat pump zoned drying system, including a drying chamber, which is characterized in that it also includes a multi-stage heat recovery dehumidification system and a heat pump zone system; The heat pump zoning system includes multiple fans, as well as interconnected compressors and condensers; The multi-stage heat recovery dehumidification system includes a heat recovery dehumidifier; The drying chamber is divided into a plurality of mutually independent gas flow areas, and the front end of each gas flow area is equipped with the fan, and a corresponding gas circulation flow path is formed in each of the areas; a plurality of the The gas flow area is arranged from top to bottom, and the regenerative dehumidifier is arranged between two adjacent gas flow areas. A wet material inlet is provided at the upper part of the drying chamber, a material conveying channel is formed in the drying chamber, and the wet material is sequentially transported through a plurality of the gas flow areas 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. 2. The multi-stage heat pump zoning drying system for heat recovery and dehumidification according to claim 1, characterized in that the drying chamber includes multiple conveying devices and multiple zoning boards, and the multiple conveying devices are arranged in parallel from top to bottom. , the drying chamber is divided into a plurality of mutually independent gas flow areas through a plurality of said conveying devices and a plurality of said partition plates. 3. The multi-stage heat pump zoned drying system for heat recovery and dehumidification according to claim 2, characterized in that each of the conveying devices includes at least three rotating shafts, and the at least three rotating shafts are arranged side by side with a certain distance between them. , the conveyor belt surrounds and covers the outside of at least three of the rotating shafts. 4. The multi-stage heat pump zone drying system for heat recovery and dehumidification according to claim 2, characterized in that the drying chamber includes a plurality of the conveying devices, and the front end of the uppermost conveying device is arranged on the wet material. below the entrance; The plurality of conveying devices includes a plurality of odd-numbered layer conveying devices and a plurality of even-numbered layer conveying devices, a plurality of odd-numbered layer conveying devices; the ends of the odd-numbered layer conveying devices are placed on the even-numbered layer conveying devices. above the front end of the conveyor device of the even-numbered layer; the end of the conveyor device of the even-numbered layer is arranged above the front end of the conveyor device of the next odd-numbered layer; And the partition plate is arranged in front of the even-numbered layer conveying device, and both sides of the partition plate are respectively connected to the even-numbered layer conveying device and the inner wall of the drying chamber. 5. The heat pump zoned drying system with multi-stage heat recovery dehumidification according to claim 2, characterized in that the multi-stage heat recovery dehumidification system includes a first heat recovery dehumidifier and a second heat recovery dehumidifier; The drying chamber includes at least five conveying devices, and the drying chamber is divided into three gas flow areas, and the three gas flow areas are respectively a first area, a second area and a third area; The first regenerative dehumidifier is disposed between the first region and the second region; the second regenerative dehumidifier is disposed between the second region and the third region. 6. The heat pump zoned drying system with multi-stage heat recovery and dehumidification according to claim 2, characterized in that a guide plate is provided above each transmission device, and the inclination direction of the guide plate is consistent with the gas. The direction of flow is the same. 7. The multi-stage heat pump zoned drying system for regenerative dehumidification according to claim 1, characterized in that the regenerative dehumidifier is a dividing wall cross-flow heat exchanger. 8. The heat pump zoned drying system with multi-stage heat recovery and dehumidification according to claim 1, wherein the heat pump zoned system includes the compressor, the evaporator and the throttle valve; the condenser includes a third A condenser and a second condenser; the compressor is connected to the first condenser, the second condenser and the throttle valve in sequence through pipelines, and the throttle valve is connected to the compressor connected.