Supersonic speed hot air jet coupling hot smoke oil sludge drying device

Abstract

The invention belongs to the technical field of oil sludge treatment, and discloses a supersonic speed hot air jet coupling hot flue gas oil sludge drying device which is structurally characterized in that a motor is connected with a speed reducer, the speed reducer is connected with the front end of a rotating shaft, the motor drives the rotating shaft to rotate after being electrified, and the speed of the rotating shaft is adjusted through the speed reducer; the barrel is transversely arranged, the rear end of the rotating shaft penetrates through the barrel, multiple rows of efficient stirring rake teeth are uniformly arranged on the rotating shaft in the barrel in the radial direction, and shoveling plate type rake blades are arranged at the ends of the efficient stirring rake teeth; a smoke outlet is formed in the top of the front end of the barrel; a material outlet is formed in the bottom; a material inlet and a compressed air inlet are formed in the top of the rear end of the barrel, a smoke inlet is formed in the side portion of the barrel, and a supersonic nozzle is arranged on the inner side of the material inlet and accelerates airflow from subsonic velocity to supersonic velocity. The supersonic spraying technology is applied to oil sludge treatment research, a novel treatment thought is provided for waste oil sludge, and development of the multi-industry combined treatment and utilization technology of petroleum industry waste is promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of oil sludge treatment, and relates to a supersonic hot air jet coupled hot flue gas oil sludge drying device. Background Art

[0002] During crude oil extraction, tiny particles in the reservoir enter the surface treatment system along with the produced oil, forming oily sludge. Oily sludge is a complex, brownish-black, viscous substance composed primarily of water, sediment, and mineral oil, all in a very stable suspended emulsion.

[0003] From a macroscopic perspective, oily sludge generally consists of oil-in-water (O / W), water-in-oil (W / O), and suspended solids, forming a relatively stable suspended emulsion system. From a microscopic perspective, oily sludge forms a stable dispersion system due to its stable hydration and charge properties. Within this mixed system, water droplets adhere layered to the surfaces of solid particles, hindering their interaction. Furthermore, sludge particles within the sludge easily react with other substances to form new chemical compounds, causing corrosion in treatment equipment and generating foul odors. These properties make oily sludge extremely hazardous in the production of petroleum products.

[0004] The hydrocarbons contained in oil sludge generated during oil production, storage, and transportation pose a significant environmental hazard and are listed as hazardous wastes on the National List of Hazardous Wastes. Major oil fields across China generate significant quantities of oil sludge annually during production. While this massive discharge of oil sludge pollutes the environment, national environmental protection authorities have also begun imposing hefty pollution fees on sludge discharge. Therefore, both from environmental and business perspectives, the management of oil sludge has become a top priority.

[0005] There are many kinds of equipment for treating oilfield sludge. Each type of equipment has its own advantages, disadvantages and scope of application. No one type of equipment can treat all types of sludge. Summary of the Invention

[0006] (1) Purpose of the invention

[0007] The purpose of the present invention is to provide a supersonic hot air jet coupled hot flue gas oil sludge drying device, which can process various types of oil sludge and solve the pollution problem of oily sludge.

[0008] (2) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a supersonic hot air jet coupled hot flue gas sludge drying device, which includes: a motor 101, a reducer 102, a supporting bearing seat 103, a rotating shaft 104, high-efficiency stirring rake teeth 105, a scooping plate type rake blade 106, a cylinder 107, and a supersonic nozzle 108; the motor 101, the reducer 102, and the rotating shaft 104 are fixed on the supporting bearing seat 103, the motor 101 is connected to the reducer 102, and the reducer 102 is connected to the front end of the rotating shaft 104. After the motor 101 is energized, it drives the rotating shaft 104 to rotate, and the speed of the rotating shaft 104 is adjusted by the reducer 102. ; The cylinder 107 is arranged horizontally, and the rear end of the rotating shaft 104 passes through the cylinder 107. Multiple rows of high-efficiency stirring rake teeth 105 are evenly arranged radially on the rotating shaft 104 inside the cylinder 107, and the ends of the high-efficiency stirring rake teeth 105 are provided with shovel-type rake blades 106; a flue gas outlet 1014 is provided at the top of the front end of the cylinder 107, and a material discharge port 1012 is provided at the bottom; a material feed port 1011 and a compressed gas inlet 1015 are provided at the top of the rear end of the cylinder 107, and a flue gas inlet 1013 is provided on the side. A supersonic nozzle 108 is provided inside the material feed port 1011, and the supersonic nozzle 108 accelerates the airflow from subsonic speed to supersonic speed.

[0010] Furthermore, during the drying process, two parts of flue gas are used to exchange heat with the material. One part of the flue gas enters the cylinder 107 from the compressed gas inlet 1015. The amount of this part of the flue gas is small and is accelerated to Mach 2 by the supersonic nozzle 108. The other part enters from the flue gas inlet 1013. The amount of this part of the flue gas is large and has a normal flow rate. The material to be processed enters from the material feed port 1011 and falls directly into the cylinder 107. It directly collides with the Mach 2 supersonic airflow ejected by the supersonic nozzle 108, which can instantly break the emulsified structure of the material and break large particles into small particles. The small particles fall to the bottom of the cylinder 107 and are then lifted up by the high-efficiency stirring rake teeth 105 and the scooping plate rake blades 106 driven by the rotating shaft 104 and pushed forward to further exchange heat with the flue gas entering from the flue gas inlet 1013. Finally, the dried material is discharged from the material discharge port 1012, and the flue gas after heat exchange is discharged from the flue gas outlet 1014 and recycled after heating.

[0011] Furthermore, a spiral guide structure 109 is provided on the rotating shaft 104 to guide the hot gas in the cylinder 107 to the discharge direction; the cylinder 107 is centered on the rotating shaft 104 and is used for heat exchange between the material and the flue gas.

[0012] Furthermore, a material observation port 1017 is provided on the rear end side wall of the cylinder 107 , through which the small particle material falling into the bottom of the cylinder 107 can be observed.

[0013] Furthermore, the supersonic nozzles 108 are arranged in a row of multiple horizontal arrays, connected to the cylinder 107 , and corresponding to the material drop position of the material feed port 1011 .

[0014] Furthermore, the supersonic nozzle 108 is a supersonic hot air nozzle, which uses the Laval nozzle contraction-expansion to accelerate the airflow from subsonic to supersonic speed; after the supersonic nozzle accelerates the heat medium to Mach 2, an oblique shock wave consisting of alternating compression waves and expansion waves is formed at the nozzle outlet. The explosion effect formed by the shock wave train and the kinetic energy of the high-speed heat medium form a diamond-shaped shock wave, which breaks the solid matter containing water into fine particles, instantly destroys the emulsified structure of the oil and water phases in the oil sludge, and realizes instantaneous evaporation and drying.

[0015] Furthermore, the supersonic nozzle 108 is made of stainless steel S30408, and the roughness grade of the inner wall of the nozzle hole is designed to be 1.6.

[0016] Furthermore, the scooping plate type rake blade 106 includes a straight plate connected to the high-efficiency stirring rake teeth 105 and a folded plate located at the end of the straight plate, the straight plate and the folded plate are at an angle of 135 degrees, and a gap is left between the folded plate and the inner wall of the cylinder 107.

[0017] Furthermore, each of the scooping plate type rake blades 106 is installed on the rotating shaft 104 at an angle of 24 degrees to the center line of the rotating shaft 104.

[0018] Furthermore, on the rotating shaft 104 , there are four high-efficiency stirring rake teeth 105 in each row, and the four high-efficiency stirring rake teeth 105 are evenly distributed at 90° intervals. After each group of high-efficiency stirring rake teeth rotates, it covers the gap between the adjacent groups of high-efficiency stirring rake teeth 105 .

[0019] (3) Beneficial effects

[0020] The supersonic hot air jet coupled hot flue gas sludge drying device provided by the above technical solution has the following beneficial effects:

[0021] (1) The oily sludge drying device of the present invention includes a motor, a reducer, a supersonic nozzle, high-efficiency stirring rake teeth, a rotating shaft, a supporting bearing seat, a cylinder, a bracket and other parts, which can operate fully automatically to achieve a system solution for continuous treatment of oily sludge and ultimately meet emission standards.

[0022] (2) This invention has developed a pollution-free, low-energy, universal, and low-cost oil sludge drying device. It innovatively applies thermal fluid array injection technology and hot air oil sludge high-efficiency mixing and stirring technology, complying with relevant national industrial policies and environmental protection technology policies. Given the severe situation of oil sludge and sewage sludge pollution and the many remaining problems, there is great potential for the layout of the new oil sludge treatment system market.

[0023] (3) The degree of reduction is extremely high. Whether it is the reduction in transportation or the reduction in energy consumption during incineration, the economic value of drying is reflected. The moisture content of traditional oily sludge dehydration technology (such as mechanical dehydration) is 70% to 80%, which cannot meet the moisture content requirements for the next step of deep treatment. This device can reduce the moisture content of the material to below 20%.

[0024] (4) Hygiene. Its high temperature environment can kill bacteria and insect eggs and stabilize the activity of organic matter.

[0025] (5) No secondary pollution. The treatment process is a physical process, and the energy required comes from high-temperature gas and waste flue gas, so it will not cause secondary pollution to the environment.

[0026] (6) Low treatment cost. The device does not produce a large amount of wastewater when treating oil sludge, which reduces water consumption and subsequent wastewater treatment costs. At the same time, since the sprayed oil sludge stays in the drying device for a long time, most of the solid phase can settle naturally, which reduces the processing capacity of the gas-solid separator and reduces the cost of gas-solid separation.

[0027] (7) Broad spectrum applicability. Applicable to various oil sludges and oil sands produced in oil fields and refineries, such as ground sludge, oil-based drill cuttings, tank cleaning sludge, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the basic equipment composition of a supersonic hot air jet coupled hot flue gas sludge drying device according to an embodiment of the present invention.

[0029] Figure 2-1 and Figure 2-2 They are respectively a cross-sectional view and a top view of a supersonic hot air jet coupled hot flue gas sludge drying device according to an embodiment of the present invention.

[0030] Figure 3 2 is a cross-sectional view of a supersonic nozzle in an embodiment of the present invention.

[0031] Figure 4 2 is a horizontal array diagram of a supersonic nozzle group in an embodiment of the present invention.

[0032] Figure 5 Schematic diagram of the shovel-type rake blade in the embodiment of the present invention.

[0033] Figure 6 This is a front view of the high-efficiency stirring rake teeth in an embodiment of the present invention.

[0034] Figure 7 It is a side view of the high-efficiency stirring rake teeth in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0036] The technical requirements that need to be achieved by the supersonic hot air jet coupled hot flue gas sludge drying device of this embodiment are as follows:

[0037] (1) The processing capacity of the device is: 2500kg / h.

[0038] (2) Main components of oil sludge: solid content 10-50%, oil content 5-20%, water content 40-85%.

[0039] (3) The moisture content of dry ash after drying treatment of oil sludge is ≤20%.

[0040] (4) The device operates smoothly.

[0041] Reference Figure 1 、 Figure 2-1 、 Figure 2-2 As shown, the supersonic hot air jet coupled hot flue gas sludge drying device of this embodiment includes: a motor 101, a reducer 102, a supporting bearing seat 103, a rotating shaft 104, a high-efficiency stirring rake 105, a scooping plate type rake blade 106, a cylinder 107, a supersonic nozzle 108, a spiral guide structure 109, and a bracket 110; the motor 101, the reducer 102, and the rotating shaft 104 are fixed on the supporting bearing seat 103, the motor 101 is connected to the reducer 102, and the reducer 102 is connected to the front end of the rotating shaft 104. When the motor 101 is energized, it drives the rotating shaft 104 to rotate, and the speed of the rotating shaft 104 is adjusted by the reducer 102. rate; the cylinder 107 is arranged horizontally, the rear end of the rotating shaft 104 passes through the cylinder 107, and multiple rows of high-efficiency stirring rake teeth 105 are evenly arranged radially on the rotating shaft 104 in the cylinder 107, and the ends of the high-efficiency stirring rake teeth 105 are provided with shovel-type rake blades 106; a flue gas outlet 1014 is provided at the top of the front end of the cylinder 107, and a material discharge port 1012 is provided at the bottom; a material feed port 1011 and a compressed gas inlet 1015 are provided at the top of the rear end of the cylinder 107, and a flue gas inlet 1013 is provided on the side, and a supersonic nozzle 108 is provided inside the material feed port 1011, which accelerates the airflow from subsonic speed to supersonic speed.

[0042] In terms of the reaction process, the present invention mainly uses two parts of flue gas to exchange heat for the material. One part of the flue gas enters the cylinder 107 through the compressed gas inlet 1015. The amount of this part of the flue gas is small and is accelerated to Mach 2 by the supersonic nozzle 108. The other part enters through the flue gas inlet 1013. The amount of this part of the flue gas is large and has a normal flow rate. The material to be processed enters from the material feed port 1011 and falls directly into the cylinder 107, where it collides directly with the Mach 2 supersonic airflow ejected from the supersonic nozzle 108, instantly breaking the emulsified structure of the material and breaking large particles into small particles, thereby greatly increasing the heat exchange area. The small particles fall into the bottom of the cylinder 107, where they are then lifted up by the high-efficiency stirring rake teeth 105 and the scooping rake blades 106 driven by the rotating shaft 104 and pushed forward, where they further exchange heat with the flue gas entering from the flue gas inlet 1013, achieving sufficient heat exchange and greatly improving the drying efficiency. Finally, the dried material is discharged from the material discharge port 1012, and the flue gas after heat exchange is discharged from the flue gas outlet 1014 and recycled after heating.

[0043] Among them, a spiral guide structure 109 is provided on the rotating shaft 104 to guide the hot air in the cylinder 107 to the discharge direction; the cylinder 107 is centered on the rotating shaft 104 and is used for heat exchange between the material and the flue gas.

[0044] The supersonic nozzles 108 are arranged in a horizontal array, connected to the cylinder 107 , and correspond to the material drop position of the material feed port 1011 .

[0045] The bracket 110 is the load-bearing part of the entire device, supporting the weight of the cylinder 107 and the bearing seat 103.

[0046] A material observation port 1017 is provided on the rear end side wall of the cylinder 107 , through which the small particle material falling into the bottom of the cylinder 107 can be observed.

[0047] A plurality of individual holes 1016 are provided at intervals on the side wall of the cylinder 107 for maintenance use.

[0048] like Figure 3As shown, the supersonic nozzle 108 of this embodiment is a supersonic hot air nozzle and a key component of the drying device. Its structural design utilizes the principle of Laval nozzle contraction-expansion to accelerate airflow from subsonic to supersonic speeds. The supersonic injection process accelerates low-pressure heat medium to form a supersonic medium flow while maintaining the stability of the heat medium flow rate. After the supersonic nozzle accelerates the heat medium to Mach 2, an oblique shock wave consisting of alternating compression and expansion waves forms at the nozzle outlet. The explosive effect created by the shock wave train and the kinetic energy of the high-speed heat medium form a diamond-shaped shock wave, which breaks the water-containing solids into fine particles and instantly destroys the emulsified structure of the oil and water phases within the oil sludge. This significantly increases the drying surface area and improves the drying efficiency. The water within the oil sludge is also rapidly evaporated, achieving instantaneous evaporation and drying.

[0049] Based on the actual conditions of sludge treatment, the properties of the spraying medium, and aerodynamic formulas, the inlet and outlet cross-sectional areas, minimum cross-sectional area, and inlet and outlet pressures of the nozzle with the required flow rate were calculated, and a supersonic nozzle machining drawing was drawn. Because jet quality is related to orifice size, orifice processing technology, and material, the more reasonable the orifice size design and the smoother the orifice, the better the jet quality. Therefore, the supersonic nozzle 108 was made of stainless steel S30408, and the orifice inner wall roughness grade was designed to be 1.6.

[0050] In order to meet the demand for large sludge processing capacity, a row of small-aperture nozzles in a horizontal array is used. Corresponding to the way the material falls into the cylinder 107, the arrangement of multiple nozzles in a row can achieve a uniform crushing effect of the material by high-speed airflow. When the material processing capacity is 2t / h, it is calculated that 1500m3 / h is required. 3 High-speed gas under standard conditions, such as Figure 4 As shown, a row of seven small nozzles, each with a 20mm outlet aperture, is used for spraying. The total effective coverage width of the jet stream from these seven nozzles reaches approximately 140mm. If a single large nozzle were used, with the same spray rate, the outlet aperture of the large nozzle would be 52mm, resulting in a coverage width of only 52mm. Furthermore, given the complexity of the media within the sludge drying unit, some media may adhere to the nozzle walls, affecting the high-speed gas jet. Therefore, the nozzle structure is designed to facilitate disassembly and regular replacement.

[0051] High-efficiency mixing and stirring technology is a key technology for oil sludge drying equipment. The material is stirred and pushed inside the drying equipment, which not only fully mixes the material with the hot flue gas, but also allows sufficient sedimentation time for the solid phase in the material. The main function of this is played by the high-efficiency mixing rake teeth 105 installed on the rotating shaft 104. Its blade shape and installation method play an important role in the processing efficiency and performance of the drying equipment. Through the research of the mixing blades in the rotary drum dryers, paddle dryers, vacuum dryers and other dryers on the market, the innovative design of the scraper-type rake blade 106 is realized. Figure 5 As shown, the rake blade is designed to be a combination of a straight plate and a folded plate, with the straight plate and the folded plate forming an angle of 135 degrees, and a gap being left between the straight plate and the inner wall of the cylinder 107, which has the advantages of large stirring volume, uniform stirring, high stirring efficiency and flexible installation.

[0052] like Figures 6 and 7 The following are front and side views of the high-efficiency mixing rakes. Each scooping blade 106 is mounted on the rotating shaft 104 at a 24° angle to the centerline of the rotating shaft 104. Each row of high-efficiency mixing rakes 105 on the rotating shaft 104 is equipped with four high-efficiency mixing rakes 105, evenly spaced at 90° intervals. Each group of high-efficiency mixing rakes rotates to cover the gaps between adjacent groups of rakes, ensuring that the material is fully turned and pushed toward the discharge port. Furthermore, a hot air spiral guide structure is designed into the rotating shaft. This spiral guide structure rotates with the rotating shaft, directing the hot air within the drying unit toward the discharge port, ensuring maximum heat exchange between the hot air and the material.

[0053] It can be seen from the above technical solution that the present invention has the following significant features:

[0054] (1) Under the rated processing capacity, the moisture content of the material can generally be reduced to below 20% after being processed by the drying device, which provides favorable conditions for the solid waste to enter the next treatment link (incineration, pyrolysis, etc.).

[0055] (2) The treatment process of the oil sludge drying device is a physical process, which does not cause secondary pollution to the environment and saves energy. It can process large solid particles of oil sludge, such as various oily sludges and oil sands produced by oil fields and refineries, and can also process municipal sludge, crushed oily kitchen waste, etc. Its drying effect is far superior to traditional physical dehydration methods (such as gravity sedimentation, mechanical centrifugal separation, etc.).

[0056] (3) The sludge drying device can be fully automated to achieve continuous processing. The application of supersonic jet technology in sludge treatment research provides a new approach to waste sludge treatment, which is conducive to promoting the development of multi-industry joint treatment and utilization technology for oil industry waste, and has pioneered a new method for domestic sludge treatment, reaching the domestic advanced level.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A supersonic hot air jet coupled hot flue gas sludge drying device, characterized in that: include: A motor (101), a speed reducer (102), a bearing support (103), a rotating shaft (104), high-efficiency stirring rake teeth (105), a scooping plate type rake blade (106), a cylinder (107), and a supersonic nozzle (108); the motor (101), the speed reducer (102), and the rotating shaft (104) are fixed on the bearing support (103); the motor (101) is connected to the speed reducer (102), and the speed reducer (102) is connected to the front end of the rotating shaft (104); after the motor (101) is energized, the rotating shaft (104) is driven to rotate, and the speed of the rotating shaft (104) is adjusted by the speed reducer (102); the cylinder (107) is arranged horizontally, and the rotating shaft (104) is fixed to the bearing support (103); the motor (101) is connected to the speed reducer (102), and the speed reducer (102) is connected to the front end of the rotating shaft (104); the motor (101) drives the rotating shaft (104) ... reducer (102) is used to adjust the speed of the rotating shaft (104); the cylinder (107) is arranged horizontally, and the rotating shaft (104) is fixed to the bearing support (103); the motor (101) is connected to the speed reducer (102), and the speed reducer (102) is 04) The rear end passes through the cylinder (107), and multiple rows of high-efficiency stirring rake teeth (105) are evenly arranged in the radial direction on the rotating shaft (104) in the cylinder (107), and the ends of the high-efficiency stirring rake teeth (105) are provided with scooping plate type rake blades (106); a smoke outlet (1014) is provided at the top of the front end of the cylinder (107), and a material discharge port (1012) is provided at the bottom; a material feed port (1011) and a compressed gas inlet (1015) are provided at the top of the rear end of the cylinder (107), and a smoke inlet (1013) is provided on the side; a supersonic nozzle (108) is provided inside the material feed port (1011), and the supersonic nozzle (108) accelerates the airflow from subsonic speed to supersonic speed.

2. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 1, characterized in that: During the drying process, two parts of flue gas are used to exchange heat with the material. One part of the flue gas enters the cylinder (107) from the compressed gas inlet (1015). The amount of this part of the flue gas is small and is accelerated to Mach 2 by the supersonic nozzle (108). The other part enters from the flue gas inlet (1013). The amount of this part of the flue gas is large and has a normal flow rate. The material to be processed enters from the material feed port (1011) and directly falls into the cylinder (107), directly colliding with the 2 Mach supersonic airflow ejected by the supersonic nozzle (108). The collision can instantly break the emulsified structure of the material and break large particles into small particles. The small particles fall into the bottom of the cylinder (107) and are then lifted up by the high-efficiency stirring rake teeth (105) and the lifting plate rake blades (106) driven by the rotating shaft (104) and pushed forward to further exchange heat with the flue gas entering the flue gas inlet (1013); finally, the dried material is discharged from the material discharge port (1012), and the flue gas after heat exchange is discharged from the flue gas outlet (1014) and recycled after being heated.

3. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 1, characterized in that: The rotating shaft (104) is provided with a spiral guide structure (109) to guide the hot gas in the cylinder (107) to the discharge direction; the cylinder (107) is centered on the rotating shaft (104) and is used for heat exchange between the material and the flue gas.

4. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 1, characterized in that: A material observation port (1017) is provided on the rear end side wall of the cylinder (107), and small particle materials falling into the bottom of the cylinder (107) are observed through the material observation port (1017).

5. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 1, characterized in that: The supersonic nozzles (108) are arranged in a row of multiple horizontal arrays, connected to the barrel (107), and corresponding to the material drop position of the material feed port (1011).

6. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 5, characterized in that: The supersonic nozzle (108) is a supersonic hot air nozzle that accelerates the airflow from subsonic to supersonic speed by using the contraction-expansion of the Laval nozzle. After the supersonic nozzle accelerates the heat medium to Mach 2, an oblique shock wave is formed at the nozzle outlet, which is an alternation of compression wave and expansion wave. The explosion effect formed by the shock wave train and the kinetic energy of the high-speed heat medium form a diamond-shaped shock wave. The shock wave breaks the solid matter containing water into fine particles, instantly destroys the emulsified structure of the oil and water phase in the oil sludge, and realizes instantaneous evaporation and drying.

7. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 6, characterized in that: The supersonic nozzle (108) is made of stainless steel S30408, and the roughness grade of the inner wall of the nozzle hole is designed to be 1.

6.

8. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 1, characterized in that: The scooping plate type rake blade (106) comprises a straight plate connected to the high-efficiency stirring rake teeth (105) and a folded plate located at the end of the straight plate, the straight plate and the folded plate are 135 degrees apart, and a gap is left between the folded plate and the inner wall of the cylinder (107).

9. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 8, characterized in that: Each of the scooping plate type rake blades (106) is installed on the rotating shaft (104) at an angle of 24 degrees to the center line of the rotating shaft (104).

10. The supersonic hot air jet coupled hot flue gas sludge drying device according to claim 9, characterized in that: On the rotating shaft (104), four high-efficiency stirring rake teeth (105) are arranged in each row. The four high-efficiency stirring rake teeth (105) are evenly distributed at 90° intervals. After each group of high-efficiency stirring rake teeth rotates, the high-efficiency stirring rake teeth (105) of the adjacent group are covered.

Images