Sludge conveying system of novel disc drying machine

Abstract

The invention provides a novel sludge conveying system of a disc dryer, the disc dryer is provided with a plurality of bin sections, and the conveying system comprises a first conveying device for conveying sludge with low water content and a second conveying device for conveying sludge with high water content. The first conveying device comprises a first sludge bin, a horizontal spiral conveying mechanism, a vertical lifting mechanism and a scraper conveying mechanism; at least one first discharge port is formed in the bottom of the first sludge bin; and the low-water-content sludge is conveyed into the bin section close to the sludge outlet end of the disc drying machine through the horizontal spiral conveying mechanism, the vertical lifting mechanism and the scraper conveying mechanism. The second conveying device comprises a second sludge bin, a screw pump and a wet sludge pipeline; at least one second discharging opening is formed in the bottom of the second sludge bin, and the high-water-content sludge is conveyed into a bin section located at the sludge inlet end of the disc drying machine through at least one screw pump and a wet sludge pipeline. And blockage caused by sludge hardening in the disc dryer is prevented, and heat energy is optimally utilized.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment, and in particular to a novel sludge conveying system of a disc dryer. Background Art

[0002] Commonly used equipment for sludge thermal drying include paddle dryers, thin layer dryers, disc dryers and drum dryers. Among them, disc dryers are widely used because of their outstanding advantages such as high thermal efficiency, small footprint, good treatment effect, low energy consumption, safety and reliability.

[0003] In the prior art, the disc dryer is generally used to treat sludge with a moisture content of about 80%, and the wet sludge is directly injected into the disc dryer for drying using a screw pump. However, for sludge with a low moisture content of about 55%, due to its high viscosity, a screw pump cannot be used to inject the sludge into the drying equipment. Moreover, after the sludge with a low moisture content enters the disc dryer, due to the high drying rate of the disc dryer, the sludge is very easy to stick in the dryer, resulting in poor shearing and crushing effects of the sludge; in actual operation, the sludge is easy to compact and clog, resulting in reduced heat transfer efficiency, thereby affecting the sludge drying effect, and the disc dryer is prone to clogging and jamming. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a novel sludge conveying system for a disc dryer, so that the sludge drying system can simultaneously receive and process sludge with a moisture content of 50% to 85%, thereby improving the sludge drying efficiency and reducing the sludge treatment cost.

[0005] The present invention provides a novel sludge conveying system of a disc dryer, wherein the disc dryer is provided with a plurality of bin sections, and the conveying system comprises a first conveying device for conveying low-water content sludge and a second conveying device for conveying high-water content sludge. Specifically, the first conveying device comprises a first sludge silo, a horizontal screw conveying mechanism, a vertical lifting mechanism and a scraper conveying mechanism; the first sludge silo is used to store low-water content sludge, and at least one first discharge port is provided at the bottom thereof; the number of horizontal screw conveying mechanisms corresponds to the number of first discharge ports, a rotary discharge valve is provided at the first discharge port, and the feed port of the horizontal screw conveying mechanism is connected to the rotary discharge valve; the low-water content sludge is conveyed to the bin section near the mud discharge end of the disc dryer through the horizontal screw conveying mechanism, the vertical lifting mechanism and the scraper conveying mechanism. The second conveying device includes a second sludge silo, a screw pump and a wet sludge pipeline; the second sludge silo is used to store high-water content sludge, and at least one second discharge port is provided at the bottom thereof. The number of screw pumps corresponds to the number of second discharge ports, one end of the screw pump is connected to the second discharge port, and the other end of the screw pump is connected to the wet sludge pipeline. The high-water content sludge is conveyed to the silo section located at the mud inlet end of the disc dryer through at least one screw pump and the wet sludge pipeline.

[0006] In some embodiments, the low moisture content sludge is conveyed to the last 1 / 3 bin section of the disc dryer.

[0007] Furthermore, the vertical lifting mechanism is provided with at least one oblique feed trough, and the number of the oblique feed troughs corresponds to the number of the horizontal spiral conveying mechanisms. Preferably, the inclination angle of the oblique feed trough is greater than 30°.

[0008] In some embodiments, two first discharge ports are provided at the bottom of the first sludge silo, and the vertical lifting mechanism is provided with two inclined feed troughs in the longitudinal direction; each first discharge port is connected to a horizontal screw conveying mechanism through a rotary discharge valve, and the two horizontal screw conveying mechanisms are arranged in parallel and have the same height; an inclined screw conveying mechanism is also provided between the discharge port of one of the horizontal screw conveying mechanisms and the inclined feed trough of the vertical lifting mechanism.

[0009] In some embodiments, the horizontal screw conveying mechanism includes a shell, a screw body and a first transmission device; the screw body is arranged in the shell, and the first transmission device is used to drive the screw body to move.

[0010] In some embodiments, the rotary discharge valve includes a valve body, a valve, a second transmission device and a sealing device; the valve is a rotary valve plate installed on the valve body; the second transmission device is used to control the rotation angle of the rotary valve plate.

[0011] In some embodiments, the scraper conveying mechanism includes a box, a scraper chain and a driving mechanism. The scraper chain is arranged in the box, and the driving mechanism is used to drive the scraper chain to move.

[0012] In some embodiments, the driving mechanism includes an electric motor, a speed reducer and a transmission sprocket. The electric motor is decelerated by the speed reducer and then connected to the transmission sprocket, and the transmission sprocket is connected to the scraper chain.

[0013] In some embodiments, the reducer is a parallel shaft hardened surface reducer, a parallel shaft helical gear reducer or a helical gear reducer.

[0014] Features and advantages of the present disclosure include:

[0015] By storing wet sludge in different moisture content ranges in different sludge silos, and then transporting the wet sludge to different silo sections of the disc dryer for treatment according to its moisture content, the sludge drying system can simultaneously receive and process sludge with a moisture content of 50% to 85%, preventing sludge compaction and blockage in the disc dryer, optimizing the use of thermal energy, achieving energy conservation and consumption reduction, improving sludge drying efficiency, and reducing sludge treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a front view schematic diagram of the sludge conveying system of the novel disc dryer of the present invention;

[0018] Figure 2 It is a top view schematic diagram of the sludge conveying system of the novel disc dryer of the present invention;

[0019] Figure 3 for Figure 1 A schematic diagram of the structure of the vertical lifting mechanism at the feed inlet;

[0020] Figure 4 for Figure 2 A schematic diagram of the arrangement of the rotary discharge valve and the horizontal screw conveying mechanism at the first discharge port of the first sludge silo;

[0021] Figure 5 It is a structural schematic diagram of the horizontal screw conveyor mechanism.

[0022] Description of reference numerals: 11-first sludge silo, 111-first discharge port, 12-second sludge silo, 121-second discharge port; 20-horizontal screw conveying mechanism, 202-housing, 204-screw body, 206-first transmission mechanism, 22-oblique screw conveying mechanism; 30-rotary discharge valve, 302-valve body, 304-valve, 306-second transmission device; 40-vertical lifting mechanism, 402-inclined feed chute, 404-conveyor belt, 406-bucket; 42-screw pump; 51-scraper conveying mechanism, 512-box, 514-scraper chain, 516-driving mechanism; 52-wet sludge pipeline; 60-disc dryer, 602-bin section, 604-mud inlet, 606-mud outlet. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present disclosure.

[0024] Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present disclosure.

[0025] The main body of the disc dryer consists of a cylindrical shell and a group of discs arranged in the shell and spaced apart along the axial direction of the shell. The disc is hollow, and the heat medium flows through the disc, and its heat is indirectly transmitted to the sludge through the disc. There are some small blades on the edge of the disc, which have a certain inclination angle. When the disc rotates, it not only helps the sludge to flow in a certain direction, but also plays a stirring role. The sludge passes between the disc and the shell, and the heat transferred by the disc evaporates the water in the sludge. The water vapor formed by the evaporation of the sludge water gathers in the dome above the disc and is taken out of the dryer by a small amount of ventilation.

[0026] The process of using disc dryer to dry sludge includes:

[0027] During the sludge feeding stage, the wet sludge is first fed into the disc dryer through the feeding device. The flow and humidity of the sludge need to be controlled to ensure the stability and efficiency of the drying process.

[0028] During the sludge drying stage, after the sludge enters the disc dryer, it will contact the rotating disc. The disc surface is designed with a special structure to increase the contact area between the sludge and the hot air and improve the drying efficiency. At the same time, the built-in heat medium such as steam, hot oil or flue gas provides a heat source to evaporate the water in the sludge.

[0029] During the drying and discharging stage, as the disc rotates, the sludge gradually loses moisture and becomes dried sludge. After the sludge is processed into dried sludge with a set humidity, it will be discharged from the tail end of the disc dryer and prepared for the next step of treatment, such as incineration, composting or resource utilization.

[0030] The present invention provides a sludge conveying system for a disc dryer, which is an optimization and improvement of the equipment system at the sludge feeding stage. In the sludge conveying system of the present invention, the disc dryer used is divided into a plurality of bin sections along the flow direction of the sludge, and the flow direction of the sludge in the disc dryer is from the sludge inlet end of the disc dryer to the sludge outlet end of the disc dryer.

[0031] See also Figure 1 and Figure 2 The sludge conveying system of the present invention includes a first conveying device for conveying low-water content sludge and a second conveying device for conveying high-water content sludge. Among them, low-water content sludge refers to sludge with a water content of 50% to 60%, and high-water content sludge refers to sludge with a water content of 75% to 85%. The first conveying device includes a first sludge silo 11, a horizontal screw conveying mechanism 20, a vertical lifting mechanism 40 and a scraper conveying mechanism 51. The second conveying device includes a second sludge silo 12, a screw pump 42 and a wet sludge pipeline 52.

[0032] See also Figure 1 , the low-water content sludge and the high-water content sludge are transported to the first sludge silo 11 and the second sludge silo 12 respectively by conveying equipment (such as a dump truck), and the flip cover on the top of the sludge silo is opened, and the low-water content sludge and the high-water content sludge can be dumped into the corresponding first sludge silo 11 or the second sludge silo 12. The first sludge silo 11 and the second sludge silo 12 are used to store low-water content sludge and high-water content sludge respectively, and use slides, hydraulic push rods and other devices to push the sludge to the discharge port when necessary, so that the sludge can be subsequently processed. In the sludge silo, the slide reciprocates under the drive of the hydraulic push rod, scraping the sludge into the horizontal screw conveying device or other conveying equipment, so as to achieve smooth discharge of the sludge. The sludge silo can be a multi-functional storage silo, a double slide silo, a square cone silo, a circular silo, a single slide silo, etc.

[0033] Specifically, at least one first discharge port 111 is provided at the bottom of the first sludge silo 11; the number of the horizontal screw conveying mechanisms 20 corresponds to the number of the first discharge ports 111. Figure 1 and Figure 4 , a rotary discharge valve 30 is provided at the first discharge port 111, and the feed port of the horizontal screw conveying mechanism 20 is connected to the discharge port of the rotary discharge valve 30. The horizontal screw conveying mechanism 20, the vertical lifting mechanism 40 and the scraper conveying mechanism 51 are fluidly connected in sequence, that is, the discharge port of the horizontal screw conveying mechanism 20 is fluidly connected to the feed port of the vertical lifting mechanism 40, and the discharge port of the vertical lifting mechanism 40 is fluidly connected to the feed port of the scraper conveying mechanism 51. The low-water content sludge is transported to the bin section 602 near the tail end of the disc dryer 60 through the horizontal screw conveying mechanism 20, the vertical lifting mechanism 40 and the scraper conveying mechanism 51.

[0034] Since the low-water content sludge has high viscosity and the disc dryer 60 has high drying efficiency, in a preferred embodiment, the low-water content sludge is directly transported to the last 1 / 3 of the bin section 602 of the disc dryer 60. Figure 1 In the illustrated embodiment, the disc dryer 60 has seven bin sections 602 arranged in sequence from the mud inlet end (front end) 604 to the mud outlet end (rear end) 606. When the moisture content of the sludge is about 80%, the high moisture content sludge is directly transported to the first (counting from the disc dryer mud inlet end 604 to the disc dryer mud outlet end 606) bin section 602. When the moisture content of the sludge is about 70%, the moisture content sludge can be directly transported to the fourth or fifth (counting from the disc dryer mud inlet end 604 to the disc dryer mud outlet end 606) bin section 602. When the moisture content of the sludge is about 55%, the low moisture content sludge can be directly transported to the sixth (counting from the disc dryer mud inlet end 604 to the disc dryer mud outlet end 606) bin section 602. Figure 1 In the embodiment shown, the disc dryer used has a power of 90KW and a capacity of treating wet sludge (solid content 20%) of 100t / d.

[0035] See also Figure 2 , at least one second discharge port 121 is provided at the bottom of the second sludge silo 12, and the number of the screw pumps 42 corresponds to the number of the second discharge ports 121. One end of the screw pump 42 is connected to the second discharge port 121, and the other end of the screw pump 42 is connected to the wet sludge pipe 52. The high-water content sludge has good fluidity, and the screw pump 42 can be directly connected to the second discharge port 121, and there is no need to set a rotary discharge valve. The high-water content sludge is pumped into the wet sludge pipe 52 through the screw pump 42, and the wet sludge pipe 52 is directly connected to the feed port at the mud inlet end of the disc dryer. The high-water content sludge is transported to the bin section 602 located at the mud inlet end of the disc dryer 60 through at least one screw pump 42 and the wet sludge pipe 52. Figure 1 In the illustrated embodiment, two second discharge ports 121 are provided at the bottom of the second sludge silo 12. The high-water content sludge flowing out from one of the discharge ports 121 is transported to the first bin section 602 at the mud inlet end of a disc dryer 60 through one of the screw pumps 42 and the wet sludge pipeline 52. The sludge flowing out from the other discharge port 121 can be transported to other disc dryers for drying.

[0036] By storing wet sludge in different moisture content ranges in different sludge silos, and then transporting the wet sludge to different silo sections of the disc dryer for treatment according to its moisture content, the sludge drying system can simultaneously receive and process sludge with a moisture content of 50% to 85%, preventing sludge compaction and blockage in the disc dryer, optimizing the use of thermal energy, achieving energy conservation and consumption reduction, improving sludge drying efficiency, and reducing sludge treatment costs.

[0037] The working principle of the vertical lifting mechanism 40 is to use devices such as a conveyor belt 404 (or chain) and a bucket 406 to realize vertical transportation of materials. The vertical lifting mechanism 40 includes a vertical structure (or pipeline), a conveyor belt (or chain, hopper), a drive system and a control system. When the sludge needs to be lifted from a low place to a high place, the sludge is placed on the conveyor belt, chain or bucket. Then, the conveyor belt (or chain) and the bucket start to move, gradually lifting the sludge in the vertical direction. The drive system can be through an electric motor, a hydraulic system or gravity. The vertical lifting mechanism 40 can realize efficient vertical transportation of sludge to a high place.

[0038] In some embodiments, see Figure 3 The vertical lifting mechanism 40 is provided with at least one oblique feed trough 402, and the number of the oblique feed troughs 402 corresponds to the number of the horizontal screw conveying mechanism 20. Setting the feed port of the vertical lifting mechanism 40 as the oblique feed trough 402 helps the low-water content sludge to smoothly enter the vertical lifting mechanism 40, and prevents the low-water content sludge from being blocked near the feed port of the vertical lifting mechanism 40 or the discharge port of the horizontal screw conveying mechanism 20. In a preferred embodiment, the inclination angle of the oblique feed trough 402 is greater than 30°, and the inclination angle refers to the angle between the extension direction of the oblique feed trough and the horizontal direction.

[0039] The number of first discharge ports 111 is related to the diameter of the first sludge silo 11. The larger the diameter of the first sludge silo 11, the more first discharge ports 111 need to be set. If the diameter of the first sludge silo 11 is less than 3.6m, only one first discharge port 111 can be set in the middle of the first sludge silo 11; if the diameter of the first sludge silo 11 is 6.5m to 7.2m, two first discharge ports 111 can be symmetrically set; if the diameter of the first sludge silo 11 is 9m to 9.6m, three or four first discharge ports 111 need to be set. The number of oblique feed troughs 402 is the same as the number of first discharge ports 111.

[0040] exist Figure 1 and Figure 3In the illustrated embodiment, two first discharge ports 111 are provided at the bottom of the first sludge silo 11, and two oblique feed troughs 402 are provided in the longitudinal direction of the vertical lifting mechanism 40; each first discharge port 111 is connected to a horizontal screw conveying mechanism 20 through a rotary discharge valve 30, and the two horizontal screw conveying mechanisms 20 are arranged in parallel and at the same height; an oblique screw conveying mechanism 22 is further provided between the discharge port of one of the horizontal screw conveying mechanisms 20 and the oblique feed trough 402 of the vertical lifting mechanism 40. The longitudinal direction refers to the lifting direction of the vertical lifting mechanism 40. The side of the oblique screw conveying mechanism 22 connected to the horizontal screw conveying mechanism 20 has a lower longitudinal height, and the other side connected to the vertical lifting mechanism 40 has a higher longitudinal height. The sludge flowing out of the discharge port of the horizontal screw conveying mechanism 20 is transported to a higher height by the oblique screw conveying mechanism 22, and then flows into the vertical lifting mechanism 40 from the oblique feed trough 402 with a higher height on the vertical lifting mechanism 40. The structure of the inclined screw conveying mechanism 22 is similar to that of the horizontal screw conveying mechanism 20 . The horizontal screw conveying mechanism 20 is arranged in the horizontal direction, and the inclined screw conveying mechanism 22 is arranged to have a specific inclination angle.

[0041] Specifically, see Figure 1 , Figure 3 and Figure 5 The horizontal screw conveying mechanism 20 can be an integrated structure, and the horizontal screw conveying mechanism 20 includes a housing 202, a screw body 204, and a first transmission device 206. In some embodiments, the horizontal screw conveying mechanism 20 includes a multi-section housing, a multi-section screw body, and a first transmission device; each housing section is provided with a screw body, and the shafts of the screw bodies are connected by flanges; the first transmission device 206 is used to drive the screw body 204 to move.

[0042] In some embodiments, see Figure 4 The rotary discharge valve 30 includes a valve body 302, a valve 304, a second transmission device 306 and a sealing device. The valve body 302 is cylindrical, and a valve cavity and a valve hole are provided inside. The valve 304 is a rotary valve plate, which is installed on the valve body 302. The valve 304 is made of metal material and has good wear resistance and sealing properties. The second transmission device 306 can be an electric motor or a pneumatic device to control the rotation angle of the valve 304. The sealing device is used to ensure the sealing of the valve during operation to prevent sludge leakage. The working principle of the rotary discharge valve 30 is based on the opening and closing of the rotary valve plate, and the unloading and stopping of the sludge are achieved by adjusting the angle of the valve 304. When the rotary discharge valve 30 is in a closed state, a seal is formed between the valve and the valve cavity to prevent the flow of sludge. When unloading is required, the second transmission device 306 is started to rotate the valve to the open position, and the sludge can flow into the interior of the valve body 302 through the valve hole.

[0043] In some embodiments, the scraper conveying mechanism 51 includes a box 512, a scraper chain 514 and a driving mechanism 516. The scraper chain 514 is arranged in the box 512, and the driving mechanism 516 is used to drive the scraper chain 514 to move. The working principle of the scraper conveying mechanism 51 is to convey the sludge by means of the moving scraper chain 514. During the process of conveying the sludge, the scraper chain 514 is completely buried in the sludge. The cross section of the box 512 can be configured to be circular, rectangular, elliptical, etc.

[0044] exist Figure 1 and Figure 2 In the illustrated embodiment, the cross-section of the box 512 of the scraper conveyor mechanism 51 is rectangular. The scraper conveyor mechanism 51 includes multiple box sections, each of which is welded by steel plates, and the box sections are sealed and fixedly connected by bolts and welding.

[0045] In some embodiments, the driving mechanism 516 of the scraper conveying mechanism 51 includes a motor, a reducer and a transmission sprocket. The motor is decelerated by the reducer and then connected to the transmission sprocket, and the transmission sprocket is connected to the scraper chain. The reducer realizes the function of deceleration and torque increase through the meshing of internal multi-stage gears, that is, the speed of the output shaft is reduced and the torque is increased, which can meet the working requirements of low speed and high torque during the transmission of low-water content sludge. The reducer can be a parallel shaft hard tooth surface reducer, a parallel shaft helical gear reducer, a helical gear reducer, etc.

[0046] The embodiments described above are only a few embodiments of the present disclosure. Those skilled in the art may make various changes or modifications to the embodiments of the present disclosure based on the contents disclosed in the application documents without departing from the spirit and scope of the present disclosure.

Claims

1. A new type of sludge conveying system for a disc dryer, characterized in that: The disc dryer (60) is provided with a plurality of bin sections (602), and the conveying system comprises a first conveying device for conveying low-water content sludge and a second conveying device for conveying high-water content sludge; The first conveying device comprises a first sludge silo (11), a horizontal screw conveying mechanism (20), a vertical lifting mechanism (40) and a scraper conveying mechanism (51); the first sludge silo (11) is used to store low-water content sludge, and at least one first discharge port (111) is provided at the bottom thereof; the number of the horizontal screw conveying mechanisms (20) corresponds to the number of the first discharge ports (111), a rotary discharge valve (30) is provided at the first discharge port (111), and the feed port of the horizontal screw conveying mechanism (20) is connected to the rotary discharge valve (30); the low-water content sludge is conveyed to a silo section (602) close to a sludge discharge end (606) of the disc dryer (60) through the horizontal screw conveying mechanism (20), the vertical lifting mechanism (40) and the scraper conveying mechanism (51); The second conveying device comprises a second sludge silo (12), a screw pump (42) and a wet sludge pipeline (52); the second sludge silo (12) is used to store high-water content sludge, and at least one second discharge port (121) is provided at the bottom of the second sludge silo; the number of the screw pumps (42) corresponds to the number of the second discharge ports (121); one end of the screw pump (42) is connected to the second discharge port (121), and the other end of the screw pump (42) is connected to the wet sludge pipeline (52); the high-water content sludge is conveyed to the silo section (602) located at the sludge inlet end (604) of the disc dryer (60) through the at least one screw pump (42) and the wet sludge pipeline (52).

2. The sludge conveying system according to claim 1, characterized in that: The low-water content sludge is transported to the rear 1 / 3 bin section (602) of the disc dryer (60).

3. The sludge conveying system according to claim 2, characterized in that: The vertical lifting mechanism (40) is provided with at least one oblique feeding trough (402), and the number of the oblique feeding troughs (402) corresponds to the number of the horizontal screw conveying mechanisms (20).

4. The sludge conveying system according to claim 3, characterized in that: The inclination angle of the inclined feed trough (402) is greater than 30°.

5. The sludge conveying system according to claim 4, characterized in that: The bottom of the first sludge silo (11) is provided with two first discharge ports (111), and the vertical lifting mechanism (40) is provided with two oblique feed troughs (402) in the longitudinal direction; each first discharge port (111) is connected to one of the horizontal screw conveying mechanisms (20) via a rotary discharge valve (30), and the two horizontal screw conveying mechanisms (20) are arranged in parallel and have the same height; an oblique screw conveying mechanism (22) is also provided between the discharge port of one of the horizontal screw conveying mechanisms (20) and the oblique feed trough (402) of the vertical lifting mechanism (40).

6. The sludge conveying system according to any one of claims 1 to 5, characterized in that: The horizontal screw conveying mechanism (20) comprises a housing (202), a screw body (204) and a first transmission device (206); the screw body (204) is arranged in the housing (202), and the first transmission device (206) is used to drive the screw body (204) to move.

7. The sludge conveying system according to any one of claims 1 to 5, characterized in that: The rotary discharge valve (30) comprises a valve body (302), a valve (304), a second transmission device (306) and a sealing device; the valve (304) is a rotary valve plate installed on the valve body (302); the second transmission device (306) is used to control the rotation angle of the rotary valve plate.

8. The sludge conveying system according to any one of claims 1 to 5, characterized in that: The scraper conveying mechanism (50) comprises a box (502), a scraper chain (504) and a driving mechanism (506); the scraper chain (504) is arranged in the box (502); and the driving mechanism (506) is used to drive the scraper chain (504) to move.

9. The sludge conveying system according to claim 8, characterized in that: The driving mechanism (506) comprises an electric motor, a speed reducer and a transmission sprocket. The electric motor is decelerated by the speed reducer and then connected to the transmission sprocket. The transmission sprocket is connected to the scraper chain.

10. The sludge conveying system according to claim 9, characterized in that: The reducer is a parallel shaft hardened gear reducer, a parallel shaft helical gear reducer or a helical gear reducer.

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