Pre-drying device for sludge blending combustion treatment based on waste heat utilization

Abstract

The utility model belongs to the technical field of sludge drying treatment, and particularly relates to a pre-drying device for sludge blending combustion treatment based on waste heat utilization, which comprises a sludge blending combustion device, a drying box for pre-drying the sludge is connected onto the sludge blending combustion device, one side of the drying box is communicated with a collecting water tank, and the other side of the drying box is communicated with a waste heat utilization device. A feeding mechanism is arranged at the top of the drying box, a sludge discharging opening is formed in the bottom of the drying box and connected with a conveying pipeline, the other end of the conveying pipeline is communicated with the sludge blending combustion device, a conveying belt is arranged in the drying box, a drying mechanism used for drying sludge is arranged on the conveying belt, and a scraping mechanism is arranged on the lower surface of the conveying belt. And the scraping mechanism directly faces the sludge discharging opening and is used for scraping the dried sludge on the surface of the conveying belt, waste heat generated by incinerating the sludge through the sludge blending combustion equipment is recycled, the waste heat is conveyed to the drying box again through the drying mechanism to dry the sludge, and energy waste is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sludge drying treatment technical field, specifically relates to a kind of pre-drying device of sludge blending combustion treatment based on waste heat utilization. BACKGROUND

[0002] Sludge treatment is the processing process of sludge for concentration, conditioning, dewatering, stabilization, drying or incineration and other reduction, stabilization and harmless. A large amount of sludge with water content of 97% to 99.7% is produced after industrial and domestic wastewater is treated. After conventional pre-dewatering treatment, the water content is still high, generally 80% to 85%. According to investigation and research, nearly 90% of the sludge produced by wastewater treatment stations and sewage treatment plants has not been properly reduced and resourceful, and the high-moisture sludge is long-term stacking, not only occupies a large amount of land, but also pollutes the soil and groundwater environment. Therefore, it is necessary to further effectively dewater and dry the sludge.

[0003] After sludge incineration, a large amount of heat is generated, which can be recycled through waste heat collection device. Waste heat is the energy that is not utilized in energy utilization equipment under certain economic and technical conditions, that is, excess and abandoned energy. Waste heat technology has the characteristics of low energy consumption, effective recycling of heat energy and energy saving. The application of waste heat technology to sludge drying and reduction can effectively save a large amount of energy. At present, the commonly used sludge dewatering and drying equipment on the market generally implements segmented dewatering and drying treatment on sludge, and the dewatering and drying process is completed in different equipment, which needs to use other energy (such as electric energy or coal combustion heat energy, etc.). The waste heat after sludge incineration is not effectively utilized, causing energy waste. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the utility model provides a kind of pre-drying device of sludge blending combustion treatment based on waste heat utilization, and the waste heat generated by sludge incineration in sludge blending equipment is recycled, and the waste heat is retransported to drying box by drying mechanism to dry sludge, which reduces energy waste and solves the problems in the above background.

[0005] To achieve the above object, the utility model discloses a kind of pre-drying device of sludge blending combustion treatment based on waste heat utilization, including sludge blending combustion device, sludge blending combustion device is connected with the drying box for the pre-drying treatment of sludge, the drying box is communicated with the collection water tank on one side, the top of drying box is provided with feeding mechanism, the bottom of drying box is provided with sludge discharge port, sludge discharge port is connected with conveying pipeline, the discharge port of conveying pipeline is communicated with the feed inlet of sludge blending combustion device, drying box is provided with conveyor belt inside, conveyor belt is provided with drying mechanism for drying sludge, drying mechanism is communicated with sludge blending combustion device, drying mechanism can retransmit the waste heat of sludge blending combustion device to drying box inside, scraping mechanism is arranged on the lower surface of conveyor belt, and scraping mechanism is directly opposite sludge discharge port for scraping sludge after drying treatment on the surface of conveyor belt.

[0006] Preferably, the drying mechanism includes a drying duct provided on the top of the drying box, a negative pressure fan is provided on the drying duct, one end of the drying duct is communicated with the sludge blending combustion device, and the other end of the drying duct is connected with a plurality of air outlets, and all the air outlets are directly opposite the upper side of the conveyor belt.

[0007] Preferably, the feeding mechanism includes a feeding box provided on the top of the drying box, a feeding duct is communicated with one side of the top of the feeding box, the bottom of the feeding box is fixedly communicated with the drying box, a driving motor is provided on the top of the feeding box, the output end of the driving motor is connected with a rotating roller, the upper section of the rotating roller is provided with a stirring frame, a rubber scraper is provided on the stirring frame, and a helical blade is provided on the lower section of the rotating roller.

[0008] Preferably, the feeding box is a cylindrical body with a cavity cross section gradually decreasing from top to bottom, a water outlet duct is provided on one side of the bottom of the feeding box, a filter screen is installed between the water outlet duct and the feeding box, a control valve is provided on the water outlet duct, and the water outlet duct is fixedly communicated with the collection water tank.

[0009] Preferably, the scraping mechanism includes a scraper provided inside the drying box in an inclined manner, and guide plates are provided on both sides of the scraper.

[0010] Preferably, the top of the scraper is attached to the lower surface of the conveyor belt, and the bottom of the scraper is directly opposite the sludge discharge port.

[0011] Preferably, an observation window is provided on the drying box.

[0012] Preferably, a control mechanism is provided on the drying box.

[0013] The beneficial effects of the utility model compared with the prior art are as follows: the pre-drying device for sludge blending combustion treatment based on waste heat utilization disclosed by the utility model reduces the water content in sludge through pre-extrusion treatment of the sludge by the feeding mechanism, recycles the waste heat generated by the sludge combustion in the sludge blending equipment, and retransmits the waste heat to the drying box through the drying mechanism to dry the sludge, so that the sludge is dried in advance before entering the sludge blending device, the waste of energy is reduced, efficient pre-drying and waste heat recycling in the sludge treatment process are realized, and important strength is contributed to environmental protection and sustainable development.

[0014] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a kind of based on waste heat utilization's sludge blending combustion treatment's pre-drying device's perspective structure schematic Figure 1 .

[0016] Figure 2 It is a kind of based on waste heat utilization's sludge blending combustion treatment's pre-drying device's perspective structure schematic Figure 2 .

[0017] Figure 3 It is a kind of based on waste heat utilization's sludge blending combustion treatment's pre-drying device's perspective structure schematic Figure 3 .

[0018] Figure 4 It is a kind of based on waste heat utilization's sludge blending combustion treatment's pre-drying device's sectional view.

[0019] Figure 5 It is a kind of based on waste heat utilization's sludge blending combustion treatment's pre-drying device's feeding mechanism perspective structure schematic.

[0020] Figure 6 It is a kind of based on waste heat utilization's sludge blending combustion treatment's pre-drying device's feeding mechanism sectional view.

[0021] In the drawing: 1, sludge blending device;2, drying box;3, feeding mechanism;31, feed tank;311, water outlet pipeline;312, control valve;32, feeding pipeline;33, driving motor;34, rotating roller;35, stirring frame;36, rubber scraper;37, spiral blade;4, conveying pipeline;5, conveying belt;6, drying mechanism;61, drying pipeline;62, air outlet;7, scraping mechanism;71, scraper;72, guide plate;8, collection water tank;9, observation window;10, control mechanism. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application. All other examples obtained by those skilled in the art without creative labor are within the scope of the present application.

[0023] In combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a pre-drying device for sludge co-firing treatment based on waste heat utilization includes a sludge co-firing device 1, a drying box 2 for pre-drying sludge connected to the sludge co-firing device 1, a water collection tank 8 connected to one side of the drying box 2, a feeding mechanism 3 at the top of the drying box 2, and a sludge discharge port at the bottom of the drying box 2. The sludge discharge port is connected to a conveying pipe 4, and the discharge port of the conveying pipe 4 is connected to the feed port 1 of the sludge co-firing device. A conveyor belt 5 is installed inside the drying box 2, and a drying mechanism 6 for drying sludge is installed on the conveyor belt 5. The drying mechanism 6 is connected to the sludge co-firing device 1 and can transfer the waste heat from the incineration of the sludge co-firing device 1 back to the interior of the drying box 2. A scraping mechanism 7 is installed on the lower surface of the conveyor belt 5, facing the sludge discharge port, for scraping off the dried sludge from the surface of the conveyor belt 5. Specifically, this sludge co-firing treatment pre-drying device based on waste heat utilization is designed to maximize resource utilization efficiency and reduce energy consumption and environmental pollution. This system achieves efficient pre-drying and waste heat recycling in the sludge treatment process. The sludge co-firing device 1, as the core heat source unit of the entire system, uses efficient incineration technology to treat the pre-treated sludge, while generating a large amount of high-temperature waste heat. The incineration process is stable and efficient, while reducing the emission of harmful gases. The drying box 2 is constructed with high-performance insulation materials to reduce heat loss, ensuring uniform heating of the sludge inside and improving pre-drying efficiency. A water collection tank 8 connected to one side of the drying box 2 collects the condensed water vapor generated during the sludge pre-drying process. This water, after treatment, can be used as process water or further purified before discharge, achieving water resource recycling. The feeding mechanism 3 is equipped with valves to control and regulate the feed rate, preventing excessive sludge accumulation in the drying box 2, which could lead to decreased treatment efficiency or uneven heat distribution. The feeding mechanism 3 also has an anti-clogging function to ensure smooth feeding. The conveying pipeline 4 is made of high-temperature and corrosion-resistant materials to ensure that the sludge is not damaged by temperature changes or chemical corrosion during transportation. The conveyor belt 5 is made of high-strength, wear-resistant, and heat-resistant materials to ensure stable operation over long periods. The surface of the conveyor belt 5 is designed with anti-slip textures to increase friction between the sludge and the conveyor belt, preventing sludge slippage. The drying mechanism 6 introduces the waste heat generated by the sludge co-firing device 1 into the drying chamber 2 through a heat exchange system, using hot air or radiant heat to efficiently dry the sludge on the conveyor belt 5. The scraping mechanism 7 is installed on the lower surface of the conveyor belt 5, directly opposite the sludge discharge port. The scraping mechanism 7 is made of wear-resistant materials to ensure that the dried sludge can be smoothly and completely scraped off the conveyor belt 5 and fall into the conveying pipe 4, continuing to enter the sludge co-firing device 1 for further processing, forming a closed-loop energy and material recycling system. This sludge co-firing pre-drying device based on waste heat utilization, through its integrated and intelligent design, achieves efficient pre-drying and waste heat recovery in the sludge treatment process, making a significant contribution to environmental protection and sustainable development.

[0024] In combination with Figure 2 , Figure 3 and Figure 4 , the drying mechanism 6 includes a drying duct 61 arranged on the top of the drying box 2, with a negative pressure fan arranged on the drying duct 61, one end of the drying duct 61 being in communication with the sludge blending combustion device 1, and the other end of the drying duct 61 being connected with a plurality of air outlets 62, all of which are directly opposite the top of the conveying belt 5. Specifically, the drying mechanism 6 ensures that the sludge can be effectively and uniformly dried before being transported to the sludge blending combustion device 1 for further processing, thereby improving the efficiency and effectiveness of subsequent processing. The drying duct 61 is made of high-quality metal materials resistant to corrosion and high temperature, such as stainless steel or special alloy, to adapt to the corrosive gases and high-temperature environment that may be generated during sludge processing. The inner wall of the drying duct 61 is smooth to reduce air resistance and improve drying efficiency. The drying duct 61 is designed with guide plates or spiral fins inside to guide the uniform distribution of hot air and increase the contact area with the surface of the sludge, promoting rapid and uniform heat transfer. The negative pressure fan, as the core power source of the drying duct 61, is installed at one end of the duct, and through the strong suction effect, it sucks the hot flue gas generated in the sludge blending combustion device 1 or the hot air provided by the external heating source into the drying duct 61. The air outlets 62 are evenly distributed along the other end of the drying duct 61, and the number is flexibly set according to the size of the drying box 2, the sludge processing capacity and the drying efficiency requirements. Each air outlet 62 ensures that the hot air flow can be injected above the conveying belt 5, directly acting on the surface of the sludge being transported.

[0025] In combination with Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the feeding mechanism 3 includes a feeding tank 31 arranged at the top of the drying box 2. The top side of the feeding tank 31 is connected with a feeding pipeline 32, and the bottom of the feeding tank 31 is fixedly connected with the drying box 2. A driving motor 33 is arranged at the top of the feeding tank 31, and the output end of the driving motor 33 is connected with a rotating roller 34. An upper section of the rotating roller 34 is provided with a stirring frame 35, and rubber scrapers 36 are arranged on the stirring frame 35. A lower section of the rotating roller 34 is provided with helical blades 37. Specifically, the feeding mechanism 3 can efficiently and uniformly feed the sludge into the drying box 2, and promote the preliminary dispersion and mixing of the sludge, thereby creating favorable conditions for the subsequent drying process. The feeding tank 31, as the portal for the sludge to enter the drying box 2, is made of corrosion-resistant and easy-to-clean materials, such as stainless steel or high-strength engineering plastics, to ensure the stability and reliability during long-term use. The top of the feeding tank 31 is seamlessly connected with the feeding pipeline 32, ensuring that the sludge can smoothly flow in. At the same time, the bottom of the feeding tank 31 is fixedly connected with the drying box 2 through a solid flange connection or welding, ensuring the sealing and stability of the feeding process. The feeding pipeline 32 serves as the channel for sludge transportation, and the inner wall of the feeding pipeline 32 is smooth to reduce friction resistance and sludge residue. In addition, the inlet end of the feeding pipeline 32 is usually equipped with a valve and a filter to control the feeding speed and prevent impurities from entering. The driving motor 33 serves as the power source of the feeding mechanism 3, and is a high-performance variable frequency motor that can adjust the speed and power according to the actual feeding requirements. The driving motor 33 is tightly connected with the rotating roller 34 through a shaft coupling or a gear box, ensuring the stability and efficiency of power transmission. The rotating roller 34 is the core component of the feeding mechanism 3, which has both stirring and conveying functions. The rotating roller 34 is made of high-quality steel and the surface is specially treated to improve wear resistance and corrosion resistance. The stirring frame 35 is fixed on the upper section of the rotating roller 34, and multiple stirring arms or blades are evenly distributed on it. When the rotating roller 34 rotates under the drive of the driving motor 33, the stirring frame 35 rotates with it, and the sludge entering the feeding tank 31 is preliminarily stirred and dispersed. The design of the stirring frame 35 helps to break the sludge clumps, increases the contact area between sludge particles, and improves the subsequent drying efficiency. In addition, rubber scrapers 36 are arranged on the stirring frame 35, which rotate with the stirring frame 35 and can effectively scrape off the sludge residue on the inner wall of the feeding tank 31, preventing scaling and clogging. The lower section of the rotating roller 34 is provided with helical blades 37, which are arranged in a spiral shape on the roller body to form a continuous conveying channel. When the rotating roller 34 rotates, the helical blades 37 push the sludge along the bottom of the feeding tank 31 to the inside of the drying box 2. The design of the helical blades 37 not only ensures the continuous and stable transportation of the sludge, but also further disperses the sludge particles through the centrifugal force generated by the rotation, improving the uniformity of the sludge.

[0026] In combination Figure 3 , Figure 4 , Figure 5and Figure 6 As shown, the feed tank 31 is a cylinder with a gradually decreasing cross-section from top to bottom. A water outlet pipe 311 is arranged on one side of the bottom of the feed tank 31, and a filter screen is installed between the water outlet pipe 311 and the feed tank 31. A control valve 312 is arranged on the water outlet pipe 311, and the water outlet pipe 311 is fixedly connected to the water collection tank 8. Specifically, the feed tank 31 is the core component of the sludge feeding system, which not only optimizes the sludge feeding process, but also ingeniously integrates the functions of water separation and discharge, further improving the efficiency and effectiveness of sludge drying treatment. The feed tank 31 is a cylinder with a gradually decreasing cross-section from top to bottom. This conical structure has multiple advantages. First, it helps guide the sludge to naturally sink under the dual action of gravity and rotating rollers 34, reducing the accumulation and clogging of sludge during the feeding process. Second, the conical design allows the sludge to be gradually compressed during its descent, which helps to squeeze out the water and light impurities, creating more favorable conditions for the subsequent drying process. On one side of the bottom of the feed tank 31, a water outlet pipe 311 is arranged, which is connected to the inside of the feed tank 31 and is responsible for discharging the separated water and other light liquids. To prevent sludge particles from being discharged with the water, a filter screen is installed between the water outlet pipe 311 and the feed tank 31. This filter screen is made of high-density metal mesh or plastic filter screen, which can effectively intercept sludge particles and ensure that only clean water passes through. The water outlet pipe 311 is equipped with a control valve 312, which can be adjusted by the operator according to the water content of the sludge in the feed tank 31 and the water discharge speed, to flexibly control the discharge rate of water. When the water content of the sludge is high, the opening of the control valve 312 can be appropriately increased to speed up the water discharge; when the water content of the sludge gradually decreases, the opening should be appropriately reduced to avoid excessive water discharge causing the sludge to be too dry and affecting the subsequent treatment effect. The other end of the water outlet pipe 311 is fixedly connected to the water collection tank 8, forming a complete drainage system. The water collection tank 8 serves as a water storage container, responsible for receiving and storing the water discharged from the feed tank 31. The water collection tank 8 can also be equipped with a water pump and pipeline system according to actual needs to recycle or discharge the collected water to a designated location.

[0027] In combination with Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the scraping mechanism 7 includes an inclined scraper 71 arranged inside the drying tank 2, and guide plates 72 are arranged on both sides of the scraper 71. In combination with Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the top of the scraper 71 is in close contact with the lower surface of the conveyor belt 5, and the bottom of the scraper 71 is directly opposite the sludge discharge port. Specifically, the scraping mechanism 7 is an important auxiliary device inside the drying box 2, which effectively cleans and scrapes the sludge residues adhering to the lower surface of the conveyor belt 5, and also ingeniously combines with the sludge discharge port to form an efficient and continuous sludge cleaning system, ensuring the continuity and efficiency of the drying process. The top of the scraper 71 is in close contact with the lower surface of the conveyor belt 5, so that the scraper 71 can directly scrape the sludge residues adhering to the lower surface of the conveyor belt 5, preventing these residues from falling back into the drying box 2 along with the movement of the conveyor belt 5, affecting the drying effect. The bottom of the scraper 71 is directly opposite the sludge discharge port, so that the scraped sludge can directly fall into the sludge discharge port and then be transported to the subsequent sludge treatment system. Moreover, the guide plates 72 arranged on both sides of the scraper 71 can prevent the sludge from adhering to the side walls of the drying box 2 during the falling process, not only improving the efficiency of sludge cleaning, but also reducing the residence time of the sludge in the drying box 2, reducing the risk of blockage and corrosion caused by sludge accumulation. At the same time, in order to ensure that the sludge can be smoothly discharged, the sludge discharge port is usually designed to have a certain inclined angle funnel structure and is equipped with appropriate flow guiding devices to guide the sludge to flow along the predetermined path.

[0028] In combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the drying box 2 is provided with an observation window 9. Specifically, the observation window 9 provided on the drying box 2 not only provides an intuitive way for the operator to understand the working state inside the drying box 2, but also plays a key role in many aspects. The observation window 9 allows the operator to directly observe the sludge state, drying process and any abnormal conditions inside the drying box 2 without opening the drying box 2. This real-time monitoring capability enables the operator to quickly respond and adjust drying parameters such as temperature, humidity, air volume, etc. to ensure efficient and stable operation of the drying process. At the same time, through the observation window 9, the operator can also regularly evaluate the drying effect and provide data support for subsequent process optimization. In the sludge drying process, high temperature, high pressure and other dangerous environments may occur inside the drying box 2. The provision of the observation window 9 allows the operator to master the situation inside the box without directly contacting these dangerous areas, thereby greatly reducing the risk of safety accidents. In addition, some advanced observation windows are also equipped with explosion-proof, corrosion-resistant and other special materials to further improve their safety and durability. The observation window 9 is also an important auxiliary tool in the maintenance and repair work of the drying box 2. Maintenance personnel can enter the inside of the drying box 2 through the observation window 9 to carry out more in-depth repair work, improving repair efficiency and accuracy. In order to ensure the practicality and durability of the observation window 9, the observation window 9 is usually made of transparent and high-temperature-resistant, corrosion-resistant materials such as tempered glass, quartz glass or special plastics. These materials not only have good light transmission and anti-aging properties, but also can withstand the harsh environment inside the drying box 2 such as high temperature and high pressure.

[0029] In combination Figure 2 , Figure 3 and Figure 4As shown, the drying box 2 is provided with a control mechanism 10. Specifically, the control mechanism 10 provided on the drying box 2 is responsible for monitoring, adjusting and optimizing various parameters during the drying process to ensure efficient, stable and reliable sludge drying. The control mechanism 10 not only improves the accuracy and stability of the drying process, but also reduces the labor intensity of the operators and reduces the risk of human operation errors. The control mechanism 10 also has a fault diagnosis and early warning function. By real-time monitoring and data analysis of the operating state of the drying box 2 and its auxiliary equipment, the control mechanism 10 can timely discover and diagnose potential fault problems, such as motor overheating, pipe blockage, sensor failure, etc. Once an abnormal situation is detected, the control mechanism 10 will immediately issue a warning signal and take appropriate protective measures, such as shutdown protection, automatic switching to backup equipment, etc., to prevent the fault from expanding and to protect the safety of equipment and personnel. In order to facilitate the operators to monitor and operate, the control mechanism 10 is equipped with a human-computer interaction interface (such as a touch screen, a display screen, etc.). The interface can directly display various parameters, operating states and fault information in the drying box 2, and provide operation menus and buttons for the operators to use. Through the human-computer interaction interface, the operators can conveniently set the process parameters, start / stop the equipment, view historical data, etc., to realize the comprehensive control of the drying process.

[0030] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A pre-drying device for sludge blending combustion treatment based on waste heat utilization, comprising a sludge blending combustion device (1), a drying box (2) for pre-drying treatment of sludge is connected to the sludge blending combustion device (1), a collecting water tank (8) is communicated on one side of the drying box (2), characterized in that, The top of the drying box (2) is provided with a feeding mechanism (3), the bottom of the drying box (2) is provided with a sludge discharge port, the sludge discharge port is connected with a conveying pipeline (4), the conveying pipeline (4) is communicated with the feeding port of the sludge blending device (1), the inside of the drying box (2) is provided with a conveying belt (5), the conveying belt (5) is provided with a drying mechanism (6) for drying sludge, the drying mechanism (6) is communicated with the sludge blending device (1), the drying mechanism (6) can retransmit the waste heat of the sludge blending device (1) to the inside of the drying box (2), the lower surface of the conveying belt (5) is provided with a scraping mechanism (7) opposite to the sludge discharge port for scraping the dried sludge on the surface of the conveying belt (5).

2. A pre-drying device for sludge blending combustion treatment based on waste heat utilization according to claim 1, characterized in that, The drying mechanism (6) comprises a drying pipeline (61) arranged at the top of the drying box (2), the drying pipeline (61) is provided with a negative pressure fan, one end of the drying pipeline (61) is communicated with the sludge blending device (1), the other end of the drying pipeline (61) is connected with a plurality of air outlets (62), and all the air outlets (62) are opposite to the upper side of the conveying belt (5).

3. The pre-drying device for sludge blending combustion treatment based on waste heat utilization according to claim 2, characterized in that, The feeding mechanism (3) comprises a feeding box (31) arranged at the top of the drying box (2), the top side of the feeding box (31) is communicated with a feeding pipeline (32), the bottom of the feeding box (31) is fixedly communicated with the drying box (2), the top of the feeding box (31) is provided with a driving motor (33), the output end of the driving motor (33) is connected with a rotating roller (34), the upper section of the rotating roller (34) is provided with a stirring frame (35), the stirring frame (35) is provided with a rubber scraper (36), and the lower section of the rotating roller (34) is provided with a spiral blade (37).

4. The pre-drying device for sludge blending combustion treatment based on waste heat utilization according to claim 3, characterized in that, The feeding box (31) is a cylindrical body with a cavity cross section gradually decreasing from top to bottom, one side of the bottom of the feeding box (31) is provided with a water outlet pipeline (311), a filter screen is arranged between the water outlet pipeline (311) and the feeding box (31), the water outlet pipeline (311) is provided with a control valve (312), and the water outlet pipeline (311) is fixedly communicated with a water collecting tank (8).

5. A pre-drying device for sludge incineration treatment based on waste heat utilization according to claim 4, characterized in that, The scraping mechanism (7) comprises an inclined scraper (71) arranged in the inside of the drying box (2), and guide plates (72) are arranged on the two sides of the scraper (71).

6. The pre-drying device for sludge blending combustion treatment based on waste heat utilization according to claim 5, characterized in that, The top of the scraper (71) is attached to the lower surface of the conveying belt (5), and the bottom of the scraper (71) is opposite to the sludge discharge port.

7. The pre-drying device for sludge blending combustion treatment based on waste heat utilization according to claim 6, characterized in that, An observation window (9) is arranged on the drying box (2).

8. The pre-drying device for sludge blending combustion treatment based on waste heat utilization according to claim 7, characterized in that, A control mechanism (10) is arranged on the drying box (2).

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