Sludge drying device

Abstract

The sludge drying device comprises a curing barn mechanism, an air pipe mechanism and a heat pump mechanism, the curing barn mechanism comprises a first box body, a curing cavity is formed in the first box body, an air outlet and an air return opening are formed in the first outer wall face of the first box body, and the air outlet and the air return opening both communicate with the curing cavity; the heat pump mechanism is arranged on one side of the first outer wall face of the first box body and comprises a second box body and a partition plate, the partition plate divides the interior of the second box body into a heat exchange cavity and a press cavity, and a ventilation opening communicating with the heat exchange cavity and the press cavity is formed in the middle of the partition plate. The air pipe mechanism comprises a main air pipe and a plurality of branch air pipes, the main air pipe is arranged on the top of the second box body, one end of the main air pipe communicates with the air return opening, the other end of the main air pipe horizontally extends in the direction away from the air return opening, and the branch air pipes are symmetrically arranged on the two sides of the main air pipe and communicate with the heat exchange cavity. The air pipe mechanism is structurally optimized, the return air heat exchange efficiency is improved, and the return air circulation speed is high.

Description

Technical Field

[0001] The present application relates to the technical field of drying equipment, and in particular to a sludge drying device. Background Art

[0002] The sludge drying unit is a specialized sludge drying device specifically developed for sludge, a material characterized by high moisture content, high viscosity, high water retention, and low calorific value. The unit's simplified internal structure features a special design that not only improves thermal efficiency but also effectively prevents sludge from sticking and overdrying within the dryer. Existing sludge drying equipment typically uses a return air heat exchanger in the return air duct. This heat exchanger is connected to a compressor, which delivers high-temperature refrigerant to the heat exchanger. The return air is then heated by the heat exchanger and recycled into the drying room. However, this return air heat exchange structure is inefficient and has a slow return air speed. Utility Model Content

[0003] The purpose of the embodiment of the present application is to provide a sludge drying device, which optimizes the structure of the air duct mechanism so that the return air enters the heat exchange chamber from both sides, and can be heat exchanged together in the middle direction before entering the baking chamber, with high heat exchange efficiency and fast return air circulation speed.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] On the one hand, a sludge drying device is provided, comprising: a baking room mechanism, an air duct mechanism, and a heat pump mechanism, wherein the baking room mechanism comprises a first box body, wherein a baking chamber is formed in the first box body, and an air outlet and an air return port are provided on a first outer wall surface of the first box body, spaced apart vertically, wherein the air outlet and the air return port are both connected to the baking chamber, and the heat pump mechanism is provided on one side of the first outer wall surface of the first box body, and comprises a second box body and a partition, wherein the partition body divides the interior of the second box body into a heat exchange chamber and a compressor chamber, and a vent is provided in the middle position of the partition body, connecting the heat exchange chamber and the compressor chamber;

[0006] The air duct mechanism includes a main air duct and multiple branch air ducts. The main air duct is arranged at the top of the second box body, and one end of the main air duct is connected to the return air outlet, and the other end extends horizontally in the direction away from the return air outlet. The multiple branch air ducts are symmetrically arranged on both sides of the main air duct and are connected to the heat exchange cavity, so that the return air enters the heat exchange cavity from both sides, and can enter the baking cavity through the ventilation port and the air outlet in turn after heat exchange.

[0007] Furthermore, the heat pump mechanism includes two heat exchangers and two compressors. The two compressors are installed in the compressor cavity and are connected to the two heat exchangers one by one through pipelines. The two heat exchangers are symmetrically arranged on both sides of the vent.

[0008] Furthermore, an air storage cavity is formed between a side of the heat exchanger facing away from the vent and an inner wall surface of the second box body.

[0009] Furthermore, the heat pump mechanism also includes a return air duct and two fan assemblies. The return air duct is installed in the compressor cavity, and one end of the return air duct extends toward the vent to be connected with the vent. The two fan assemblies are symmetrically installed on both sides of the return air duct, and the air inlet end of the fan assembly is connected to the return air duct, and the air outlet end is connected to the air outlet.

[0010] Furthermore, the heat pump mechanism further includes two air outlet pipes, one end of the two air outlet pipes is respectively connected to the air outlet ends of the two fan assemblies, and the other end is connected to the air outlet.

[0011] Furthermore, the cross-sections of the two air outlet pipes are trapezoidal in shape, the ends with smaller diameters are connected to the air outlet end of the fan assembly, and the ends with larger diameters are connected to the air outlet.

[0012] Furthermore, it also includes a plurality of support members, which are arranged between the bottom of the main air duct and the top of the second box.

[0013] Furthermore, the plurality of support members are arranged in an array.

[0014] Furthermore, four branch air ducts are provided, and two of them are symmetrically arranged on both sides of the main air duct.

[0015] Furthermore, it also includes multiple layers of mesh belts, which are arranged in the baking cavity at intervals along the vertical direction.

[0016] Furthermore, the baking room mechanism, the air duct mechanism and the heat pump mechanism are combined to form an independent system module, and the sludge drying device includes a plurality of the system modules sequentially spliced ​​along the sludge conveying direction.

[0017] The beneficial effects of the present application are as follows: a baking chamber is provided in the baking room mechanism for placing sludge and performing drying treatment, and an air outlet and a return air outlet are provided on the outer wall thereof to realize the circulation of hot air, and the heat pump mechanism is cleverly arranged on one side of the baking room mechanism, and its interior is divided into a heat exchange chamber and a compressor chamber by a partition, and a vent is provided between the two chambers to regulate the airflow.

[0018] The air duct mechanism is the key to improving drying efficiency. It consists of a main air duct and multiple symmetrically distributed branch air ducts. The main air duct spans the top of the heat pump mechanism, with one end connected to the return air outlet and the other end extending horizontally, serving as the main channel for return air. The branch air ducts are symmetrically arranged on both sides of the main air duct and directly connected to the heat exchange cavity. This layout allows the return air to be quickly diverted from the main air duct and quickly enter the heat exchange cavity from both sides. In the heat exchange cavity, the return air fully exchanges heat with the high-temperature refrigerant released by the heat pump system, and the temperature rises rapidly. The key is that the return air on both sides can converge towards the middle after heat exchange and pass through the vents on the partition, and finally re-enter the baking cavity through the air outlet, forming an efficient hot air circulation system.

[0019] This design not only significantly improves heat exchange efficiency, allowing return air to be fully heated in a shorter time, but also accelerates the return air circulation rate, ensuring that moisture in the drying chamber is promptly discharged and the sludge is evenly heated, thereby improving the drying effect. Furthermore, efficient thermal energy utilization reduces unnecessary energy consumption, achieving the goal of energy conservation and consumption reduction, and meeting the dual pursuit of environmental protection and economic benefits in modern industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present application is further described in detail below with reference to the accompanying drawings and examples.

[0021] Figure 1 This is a three-dimensional diagram of the sludge drying device according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the internal structure of the air duct mechanism and the heat pump mechanism according to the embodiment of the present application;

[0023] Figure 3 This is a top view of the internal structure of the second box body in an embodiment of the present application.

[0024] In the figure: 1. Curing room mechanism; 101. First box body; 2. Air duct mechanism; 201. Main air duct; 202. Branch air duct; 203. Support member; 3. Heat pump mechanism; 301. Second box body; 302. Partition; 303. Heat exchange chamber; 304. Compressor chamber; 305. Heat exchanger; 306. Compressor; 307. Return air duct; 308. Fan assembly; 309. Air outlet duct; 3021. Ventilation port; 3051. Air storage chamber. DETAILED DESCRIPTION

[0025] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0026] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] like Figure 1-Figure 3 As shown, this embodiment provides a sludge drying device, including: a baking room mechanism 1, an air duct mechanism 2 and a heat pump mechanism 3, the baking room mechanism 1 includes a first box body 101, a baking chamber is formed in the first box body 101, and the first outer wall surface of the first box body 101 is provided with air outlets and return air outlets spaced apart in an upper and lower manner, and the air outlets and the return air outlets are both connected to the baking chamber, the heat pump mechanism 3 is arranged on one side of the first outer wall surface of the first box body 101, the heat pump mechanism 3 includes a second box body 301 and a partition 302, the partition 302 divides the interior of the second box body 301 into a heat exchange chamber 303 and a compressor chamber 304, and a vent 3021 connecting the heat exchange chamber 303 and the compressor chamber 304 is opened in the middle position of the partition 302;

[0029] The air duct mechanism 2 includes a main air duct 201 and multiple branch air ducts 202. The main air duct 201 is arranged at the top of the second box body 301, and one end of it is connected to the return air outlet, and the other end extends horizontally in the direction away from the return air outlet. The multiple branch air ducts 202 are symmetrically arranged on both sides of the main air duct 201 and are connected to the heat exchange cavity 303, so that the return air enters the heat exchange cavity 303 from both sides, and can enter the baking cavity after heat exchange through the ventilation port 3021 and the air outlet in turn.

[0030] Based on the above scheme, the sludge is placed in the baking chamber within the first housing 101 of the baking room mechanism 1 and dried using the heat provided by the heat pump mechanism 3. During the drying process, the moisture in the sludge gradually evaporates, and the generated water vapor and some of the moisture that has not completely evaporated need to be processed and recycled through the return air system. The moisture in the baking chamber is collected through the return air port set on the first outer wall of the first housing 101. This moisture (i.e., return air) is then guided into the main air duct 201 of the air duct mechanism 2. One end of the main air duct 201 is connected to the return air port, and the other end extends horizontally and is located at the top of the second housing 301. A plurality of branch air ducts 202 are symmetrically arranged on both sides of the main air duct 201. These branch air ducts 202 are directly connected to the heat exchange chamber 303. This design allows return air to enter the heat exchange chamber 303 from both sides of the main air duct 201 simultaneously, forming a "sandwich" heat exchange mode. The return air entering the heat exchange chamber 303 undergoes heat exchange under the action of the heat pump mechanism 3. The heated return air converges toward the center of the heat exchange chamber 303 and enters the press chamber 304 through the vents 3021 on the partition 302. The heated return air ultimately re-enters the drying chamber through the air outlet provided on the first outer wall of the first housing 101, completing the cycle. This not only improves the efficiency of thermal energy utilization but also accelerates the return air circulation rate, thereby enhancing the efficiency of sludge drying.

[0031] In general, by allowing the return air to enter the heat exchange chamber 303 from both sides at the same time and converge in the middle for heat exchange, the heat exchange area and heat exchange time are increased, thereby significantly improving the heat exchange efficiency. The optimized design of the air duct mechanism 2 enables the return air to enter and leave the heat exchange chamber 303 more quickly, reducing flow resistance and increasing the circulation speed, which is conducive to quickly removing moisture from the baking chamber and accelerating the sludge drying process. Due to the improvement in heat exchange efficiency and return air circulation speed, the sludge can be heated more evenly, avoiding problems of local overheating or uneven drying, thereby improving the drying effect. By efficiently utilizing thermal energy and reducing unnecessary energy losses, the device can significantly reduce energy consumption during the drying process, meeting the requirements of energy conservation and environmental protection.

[0032] Furthermore, the heat pump mechanism 3 includes two heat exchangers 305 and two compressors 306. The two compressors 306 are installed in the compressor cavity 304 and are connected to the two heat exchangers 305 in a one-to-one relationship via pipelines. The two heat exchangers 305 are symmetrically arranged on either side of the vent 3021. The two compressors 306 are installed in the compressor cavity 304 and are connected to the two heat exchangers 305 in a one-to-one relationship via a carefully designed piping system. This one-to-one connection ensures that the compressors 306 can efficiently transport refrigerant to the corresponding heat exchangers 305, thereby achieving effective heat transfer. The two heat exchangers 305 are symmetrically arranged on either side of the vent 3021. This layout not only optimizes space utilization but also ensures that the return air is more evenly heated as it passes through the heat exchange cavity 303. When return air enters the return air port and flows through the main air duct 201, it is then divided into the branch air ducts 202 on both sides. It then enters the heat exchange chamber 303 from both sides through the branch air ducts 202, and then passes through the two heat exchangers 305 for heat exchange. After heat exchange in the heat exchangers 305, the return air ducts on both sides converge into the space above the vent 3021, and finally enter the compressor chamber 304 below through the vent 3021, and then enter the baking chamber to form an air circulation. It should be noted that a separate space is required for the return air after heat exchange to enter the compressor chamber 304, so that the return air does not come into contact with the compressor 306 and other structural components in the compressor chamber 304, causing malfunction. In addition, the use of two heat exchangers 305 also enhances the stability and reliability of the system. Even if one heat exchanger 305 temporarily stops working due to a malfunction or maintenance need, the other heat exchanger 305 can continue to operate, ensuring the continuity and stability of the drying process.

[0033] Furthermore, an air storage chamber 3051 is formed between the side of the heat exchanger 305 facing away from the vent 3021 and the inner wall of the second housing 301. The air storage chamber 3051 is designed to effectively store the return air before it passes through the heat exchanger 305 for heat exchange. This space allows air within the main air duct 201 to be continuously and stably transported to the air storage chamber 3051 via the air distribution duct 202, thereby ensuring that sufficient return air can flow through the heat exchanger 305 simultaneously during the heat exchange process. When the return air is evenly distributed within the air storage chamber 3051, it can more effectively exchange heat with the heat exchanger 305. Due to the presence of the air storage chamber 3051, the return air does not suffer from a decrease in heat exchange efficiency due to excessive flow or uneven distribution during the heat exchange process. Instead, the air storage chamber 3051 provides a relatively stable heat exchange environment for the return air, allowing the return air to interact with the heat exchanger 305 for a longer and more complete time, thereby improving heat exchange efficiency.

[0034] Furthermore, the air storage chamber 3051 balances the system's airflow. During the drying process, as the return air is continuously heated and recycled, the airflow conditions within the system may change. The air storage chamber 3051 absorbs and adjusts these changes, ensuring that airflow remains evenly distributed within the heat pump mechanism 3, thereby reducing the risk of heat loss or equipment damage caused by uneven airflow.

[0035] In some embodiments, the return air duct 307 is installed within the compressor chamber 304, with one end extending toward and ultimately connecting to the vent 3021. This design enables the heat pump mechanism 3 to more effectively collect and process return air from the vent 3021. Furthermore, to further optimize the flow and distribution of return air, two fan assemblies 308 are symmetrically mounted on either side of the return air duct 307. This layout not only ensures that the fan assemblies 308 generate balanced wind force during operation, but also helps reduce energy consumption and noise caused by uneven airflow. The air inlet end of each fan assembly 308 is tightly connected to the return air duct 307, ensuring smooth entry of return air into the fan assembly 308. The air outlet end of each fan assembly 308 is connected to the air outlet. The hot air, pressurized and accelerated by the fan assembly 308, is then delivered through these outlets into the grilling chamber or other areas requiring heating. This design offers multiple advantages. First, the introduction of fan assembly 308 enhances the system's air circulation capacity, allowing return air to be heated more quickly and returned to the drying chamber, thereby improving drying efficiency. Second, the symmetrical layout of fan assembly 308 and its close connection to return air duct 307 ensure stable and uniform airflow, reducing heat loss caused by turbulent airflow. Finally, the pressurization and acceleration of fan assembly 308 allow hot air to enter the drying chamber at a higher speed and temperature, further accelerating the sludge drying process.

[0036] To further refine and optimize the air flow path, two outlet ducts 309 are specially designed. One end of each outlet duct 309 is connected to the outlet of each fan assembly 308, while the other end is directly connected to the air outlet. This design offers significant advantages. First, the outlet duct 309 ensures that the hot air output by the fan assembly 308 is directly and efficiently directed to the air outlet, reducing resistance and heat loss during air transmission. Because the outlet duct 309 is directly connected to the fan assembly 308 and the air outlet, the hot air can maintain a high temperature and flow rate, thereby improving drying efficiency. Second, the symmetrical layout of the two outlet ducts 309 echoes the arrangement of the fan assembly 308, further enhancing the balance and stability of the system. When the two fan assemblies 308 are operating simultaneously, the hot air generated by them flows through their respective outlet ducts 309 to the air outlet, ensuring even distribution of the hot air within the baking chamber. In addition, the introduction of the air outlet pipe 309 simplifies the structure of the system, making the air flow path inside the heat pump mechanism 3 clearer and more direct. This not only facilitates maintenance and repair of the system, but also improves the operating efficiency and reliability of the entire device.

[0037] Furthermore, the cross-sections of the two air outlet ducts 309 are trapezoidal in shape, with the smaller end connected to the air outlet of the fan assembly 308 and the larger end connected to the air outlet. From the air outlet of the fan assembly 308 to the air outlet, as the caliber gradually increases, the space inside the air outlet duct 309 gradually expands. This design helps to reduce the resistance of the air during flow, allowing the hot air to flow more smoothly to the air outlet. At the same time, the trapezoidal design can also guide the air flow to a certain extent, ensuring that the hot air can be evenly distributed to every corner of the baking chamber, thereby improving the drying efficiency. Moreover, the trapezoidal cross-section of the air outlet duct 309 is also easy to install and maintain. Its structure is relatively simple, and the connection between the fan assembly 308 and the air outlet is rationally designed and easy to disassemble and replace. When the heat pump mechanism 3 needs to be maintained or repaired, the staff can easily operate the air outlet duct 309 to ensure the normal operation of the entire drying system.

[0038] Generally speaking, it also includes a plurality of support members 203, which are arranged between the bottom of the main air duct 201 and the top of the second housing 301. The support members 203 are key components connecting the main air duct 201 and the second housing 301. They can withstand and disperse the various forces and vibrations generated by the drying device during operation, thereby ensuring the structural stability of the entire device. Through reasonable layout and design, the support members 203 can effectively reduce the vibration and noise generated by the drying device during operation, and improve the operational stability and service life of the equipment. Moreover, the support members 203 also have a certain adjustment function, and the height and position between the main air duct 201 and the second housing 301 can be adjusted according to actual installation requirements to ensure that the drying device can be smoothly docked with other equipment or systems. The support members 203 are usually made of high-strength, corrosion-resistant materials, such as stainless steel or alloy steel, to ensure that they can withstand the various forces and vibrations generated by the drying device during operation.

[0039] The layout and number of the support members 203 are usually determined according to the specific specifications, weight and operating requirements of the drying device. Usually, the support members 203 are evenly distributed between the bottom of the main air duct 201 and the top of the second box body 301 to ensure that the entire device is evenly stressed, stable and reliable. At the same time, according to actual needs, additional support members 203 can also be set at other key positions of the main air duct 201 to enhance its stability. One of the situations is that a plurality of the support members 203 are arranged in an array. The array arrangement can ensure that each support member 203 bears a relatively uniform load, which can avoid one or some support members 203 from being damaged due to bearing excessive loads, thereby improving the reliability and durability of the entire drying device. Moreover, the array arrangement can make more reasonable use of space, so that the spacing and position between the support members 203 are optimized, which helps to reduce unnecessary material waste and makes the structure of the entire drying device more compact and beautiful.

[0040] In some embodiments, four air branch ducts 202 are provided, and are symmetrically arranged in pairs on both sides of the main air duct 201. By arranging the air branch ducts 202 symmetrically in pairs, it is possible to ensure that the air diverted from the main air duct 201 can be evenly distributed to each air branch duct 202. This even distribution helps reduce vortices and dead spots in the air flow, and improves the smoothness and efficiency of the air flow.

[0041] It's worth noting that while these embodiments utilize a design with four air distribution ducts 202 symmetrically arranged in pairs, this doesn't necessarily represent the only viable solution. In practice, adjustments and optimizations can be made based on factors such as the type, quantity, and shape of the material being dried, as well as drying requirements. For example, the number of air distribution ducts 202 can be increased or decreased, their arrangement can be modified, or their dimensions can be adjusted to meet varying drying requirements.

[0042] Optionally, multiple layers of mesh belts are vertically spaced apart within the oven cavity. In practice, the installation and securing of these multiple layers of mesh belts require special attention. Typically, the mesh belts are mounted within the oven cavity using components such as brackets or rollers to ensure smooth operation and rotation. Furthermore, factors such as the mesh belt's material, strength, and corrosion resistance must be considered to ensure long-term stable operation in high-temperature, humid, and corrosive environments.

[0043] At the same time, in order to ensure that the hot air can smoothly pass through each layer of mesh belt and blow the sludge evenly, it is necessary to set certain gaps and ventilation holes between the mesh belts. The size and distribution of these gaps and ventilation holes also need to be reasonably designed and adjusted according to the characteristics of the sludge and drying requirements.

[0044] It's worth noting that the barn mechanism 1, the air duct mechanism 2, and the heat pump mechanism 3 combine to form an independent system module. The sludge drying device comprises multiple system modules connected sequentially along the sludge conveying direction. This modular design not only simplifies the device's structure but also enhances its flexibility and scalability. Each system module performs complete drying functions, including sludge heating, air conveying, and heat recovery and reuse. When processing large quantities of sludge, users can combine multiple system modules sequentially along the sludge conveying direction to form a larger sludge drying device. This connection method is not only simple and fast, but also ensures that the modules work together effectively, achieving efficient sludge drying. Furthermore, the modular design offers the advantages of flexibility and customizability. Users can select the appropriate number and configuration of system modules based on factors such as sludge type, humidity, and processing volume to achieve optimal drying results and economic benefits. The modular design also facilitates maintenance and upgrades. If a module fails or requires an update, the user can perform operations on that module individually without disrupting the overall operation of the device.

[0045] The modular design also helps reduce equipment transportation and installation costs. Because each system module is independent and compact, it can be transported and installed more conveniently. This not only reduces the equipment's footprint but also increases transportation efficiency and installation speed.

[0046] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other positions or relationships are used solely for ease of description and simplified operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0047] Throughout this specification, references to terms such as "an embodiment" or "example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The technical principles of the present application have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the present application and are not to be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present application without inventive effort, and such implementations will fall within the scope of protection of the present application.

Claims

1. A sludge drying device, characterized in that: include: A baking room mechanism (1), an air duct mechanism (2) and a heat pump mechanism (3), wherein the baking room mechanism (1) comprises a first box body (101), a baking cavity is formed in the first box body (101), an air outlet and an air return port are provided on a first outer wall surface of the first box body (101) and are spaced apart from each other, the air outlet and the air return port are both connected to the baking cavity, the heat pump mechanism (3) is arranged on one side of the first outer wall surface of the first box body (101), the heat pump mechanism (3) comprises a second box body (301) and a partition (302), the partition (302) divides the interior of the second box body (301) into a heat exchange cavity (303) and a compressor cavity (304), and a vent (3021) is provided in the middle position of the partition (302) for connecting the heat exchange cavity (303) and the compressor cavity (304); The air duct mechanism (2) includes a main air duct (201) and a plurality of branch air ducts (202), wherein the main air duct (201) is arranged at the top of the second box body (301), and one end thereof is connected to the return air port, and the other end thereof extends horizontally in a direction away from the return air port, and the plurality of branch air ducts (202) are symmetrically arranged on both sides of the main air duct (201) and are connected to the heat exchange cavity (303), so that the return air enters the heat exchange cavity (303) from both sides, and can enter the baking cavity through the ventilation port (3021) and the air outlet in sequence after heat exchange.

2. The sludge drying device according to claim 1, characterized in that: The heat pump mechanism (3) includes two heat exchangers (305) and two compressors (306). The two compressors (306) are installed in the compressor cavity (304) and are connected to the two heat exchangers (305) in a one-to-one correspondence through pipelines. The two heat exchangers (305) are symmetrically arranged on both sides of the ventilation port (3021).

3. The sludge drying device according to claim 2, characterized in that: An air storage cavity (3051) is formed between a side of the heat exchanger (305) facing away from the vent (3021) and the inner wall surface of the second box body (301).

4. The sludge drying device according to claim 1, characterized in that: The heat pump mechanism (3) further comprises a return air duct (307) and two fan assemblies (308); the return air duct (307) is installed in the compressor chamber (304), one end of which extends toward the vent (3021) to communicate with the vent (3021); the two fan assemblies (308) are symmetrically installed on both sides of the return air duct (307); the air inlet end of the fan assembly (308) is connected to the return air duct (307), and the air outlet end is connected to the air outlet.

5. The sludge drying device according to claim 4, characterized in that: The heat pump mechanism (3) further comprises two air outlet pipes (309), one end of the two air outlet pipes (309) being respectively connected to the air outlet ends of the two fan assemblies (308), and the other end being connected to the air outlet.

6. The sludge drying device according to claim 5, characterized in that: The cross-sections of the two air outlet pipes (309) are trapezoidal in shape, with the ends with smaller diameters connected to the air outlet end of the fan assembly (308), and the ends with larger diameters connected to the air outlet.

7. The sludge drying device according to any one of claims 1 to 6, characterized in that: It also includes a plurality of support members (203), wherein the support members (203) are arranged between the bottom of the main air duct (201) and the top of the second box (301).

8. The sludge drying device according to claim 7, characterized in that: The plurality of support members (203) are arranged in an array.

9. The sludge drying device according to any one of claims 1 to 6, characterized in that: Four branch air ducts (202) are provided, and are symmetrically arranged in pairs on both sides of the main air duct (201).

10. The sludge drying device according to any one of claims 1 to 6, characterized in that: The baking room mechanism (1), the air duct mechanism (2), and the heat pump mechanism (3) are combined to form an independent system module, and the sludge drying device comprises a plurality of the system modules sequentially connected along the sludge conveying direction.

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