Sludge drying and carbonizing integrated furnace and sludge treatment method

Abstract

The application discloses a sludge drying and carbonizing integrated furnace and a sludge treatment method, relates to the technical field of sludge treatment, and comprises a furnace body, the inside of the furnace body is limited to a combustion space and a sludge treatment space; a discharging switching device is configured to send sludge into the combustion space or send sludge out of the furnace body. The application can quickly dry and carbonize the sludge by arranging the combustion space and the sludge treatment space in the furnace body, and the sludge after carbonization treatment is sent into the combustion space by the discharging switching device for combustion, the pyrolysis oil gas generated in the drying and carbonizing process is solved, and the carbon residue formed after the sludge drying and carbonization is sent for combustion, which can not only reduce energy consumption and sludge discharge amount, but also can discharge the carbon residue after drying and carbonization when needed, and the application mode is flexible.

Description

Technical Field

[0001] This application relates to the field of sludge treatment technology, and in particular to an integrated sludge drying and carbonization furnace and a sludge treatment method. Background Technology

[0002] With increasing modernization and industrialization, the discharge of domestic and industrial wastewater is growing, making sludge an unavoidable byproduct of wastewater treatment plants. Sludge consists of solid matter from the original wastewater and solid matter generated during wastewater treatment. Sludge contains a large number of pathogens, antibiotics, and heavy metals, among other harmful substances. Currently, aerobic composting and anaerobic fermentation methods are insufficient to completely remove it, impacting subsequent resource utilization.

[0003] In existing technologies, sludge carbonization processes generate gases such as pyrolysis oil and gas, which have a significant impact on environmental pollution when discharged with the sludge. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, in a first aspect, this application proposes an integrated sludge drying and carbonization furnace, which can solve the problems of pyrolysis oil and gas and emissions generated during sludge carbonization treatment.

[0005] Secondly, this application proposes a sludge treatment method applied to the aforementioned integrated sludge drying and carbonization furnace.

[0006] According to the first aspect of this application, the integrated sludge drying and carbonization furnace includes:

[0007] The furnace body defines a combustion space and a sludge treatment space. The combustion space is configured to provide heat through combustion, and the sludge treatment space is configured to perform sludge drying and carbonization treatment based on the heat provided by the combustion space.

[0008] The discharge switching device is installed in the furnace body and includes a feed inlet, a first discharge outlet and a second discharge outlet. The feed inlet is connected to the output end of the end process of the sludge treatment space to receive the sludge that has been dried and carbonized. The first discharge outlet is connected to the combustion space and the second discharge outlet extends to the outside of the furnace body and is connected to the outside.

[0009] The discharge switching device is configured to send the dried and carbonized sludge into the combustion space or send the sludge out of the furnace.

[0010] The integrated sludge drying and carbonization furnace according to the embodiments of this application has at least the following beneficial effects:

[0011] The integrated sludge drying and carbonization furnace of this embodiment, by setting up a combustion space and a sludge treatment space inside the furnace, can quickly dry and carbonize sludge. The carbonized sludge is then fed into the combustion space for combustion using a discharge switching device, which solves the problem of pyrolysis oil and gas generated during the drying and carbonization process. The carbon residue formed after sludge drying and carbonization is also fed into the combustion chamber, which can reduce energy consumption and sludge discharge, and can also discharge the carbon residue after drying and carbonization when needed, making it flexible in application.

[0012] According to some embodiments of this application, the furnace body includes:

[0013] A combustion chamber, the interior of which defines the combustion space;

[0014] A carbonization cylinder is sleeved on the outside of the combustion cylinder and defines a carbonization space between the carbonization cylinder and the combustion cylinder.

[0015] A drying cylinder is sleeved on the outside of the carbonization cylinder, and a drying space is defined between the drying cylinder and the carbonization cylinder.

[0016] A pre-drying cylinder is sleeved on the outside of the drying cylinder and defines a pre-drying space between them. The pre-drying cylinder is provided with a pre-drying inlet.

[0017] The pre-drying space, the drying space, and the carbonization space are sequentially connected and together form the sludge treatment space. After the sludge is fed in through the pre-drying inlet, it is sequentially fed into the pre-drying space, the drying space, and the carbonization space for pre-drying, drying, and carbonization.

[0018] According to some embodiments of this application, the discharge switching device includes:

[0019] A first spiral conveying mechanism is arranged along the axial direction of the combustion cylinder and is configured to convey material from the carbonization cylinder to the combustion cylinder.

[0020] A second spiral conveyor mechanism is coaxially arranged with the first spiral conveyor mechanism, and the second spiral conveyor mechanism is configured to convey from the carbonization cylinder to a direction away from the combustion cylinder.

[0021] A feed pipe is provided between the first screw conveyor mechanism and the second screw conveyor mechanism. The upper end of the feed pipe is provided with a feed inlet that connects to the carbonization space, and the lower end is provided with a discharge outlet that connects to both the first screw conveyor mechanism and the second screw conveyor mechanism. A guide plate is rotatably provided inside the feed pipe. The guide plate is configured to guide the material into the first screw conveyor mechanism or into the second screw conveyor mechanism.

[0022] According to some embodiments of this application, the furnace body further includes a third spiral conveying mechanism, which is coaxially arranged with the first spiral conveying mechanism. The input end of the third spiral conveying mechanism is connected to the pre-drying space, and the output end is connected to the drying space.

[0023] The first spiral conveying mechanism, the second spiral conveying mechanism, and the third spiral conveying mechanism are connected to the same transmission main shaft.

[0024] According to some embodiments of this application, the discharge switching device further includes a fourth spiral conveying mechanism, the input end of which is connected to the output end of the second spiral conveying mechanism within the carbonization space, and the output end of which extends out of the outside of the pre-drying cylinder.

[0025] According to some embodiments of this application, the furnace body further includes:

[0026] An exhaust mechanism is provided in the combustion cylinder, and the exhaust mechanism is provided with an exhaust channel connecting the combustion space and the carbonization space. The exhaust channel has an open state and a closed state.

[0027] The exhaust mechanism is configured to deliver gas from the carbonization space to the combustion space.

[0028] According to some embodiments of this application, the exhaust mechanism includes a plug and an elastic member. The plug is closed in the exhaust passage and can move toward the combustion space to open the exhaust passage. The elastic member abuts against the side of the plug near the combustion space.

[0029] According to some embodiments of this application, the carbonization cylinder, the drying cylinder, and the pre-drying cylinder are coaxially rotatable, the rotation direction of the drying cylinder is opposite to the rotation direction of the carbonization cylinder and the pre-drying cylinder, and the inner walls of the carbonization cylinder, the drying cylinder, and the pre-drying cylinder are provided with lifting plates, which are configured to move materials from one end of each cylinder to the other during rotation.

[0030] According to some embodiments of this application, a linkage component is provided between two adjacent cylinders so that the carbonization cylinder, the drying cylinder, and the pre-drying cylinder rotate synchronously.

[0031] The sludge treatment method according to the second aspect of this application, applied to the above-mentioned integrated sludge drying and carbonization furnace, includes:

[0032] The sludge to be treated is sent into the sludge treatment space of the furnace to complete the carbonization process.

[0033] The carbonized sludge is sent into the combustion space of the furnace for combustion.

[0034] The sludge treatment method according to the embodiments of this application has at least the following beneficial effects: This method directly sends the carbonized sludge into the combustion space for combustion, which solves the problem of gas generated during the drying and carbonization process, and sending the sludge into combustion can reduce energy consumption and reduce sludge discharge.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0036] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0037] Figure 1 This is a schematic diagram of an overall structure of this application;

[0038] Figure 2 This is a schematic diagram of the linkage between the cylinders in this application;

[0039] Figure 3 A schematic diagram of a discharge switching device;

[0040] Figure 4 This is a schematic diagram of an exhaust mechanism. Detailed Implementation

[0041] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0045] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Reference Figures 1 to 3This invention provides an integrated sludge drying and carbonization furnace, comprising a furnace body 100 and a discharge switching device 600. Specifically, the furnace body 100 internally defines a combustion space 101 and a sludge treatment space 102. The combustion space 101 is configured for combustion to provide heat, and the sludge treatment space 102 is configured to perform sludge drying and carbonization treatment using the heat provided by the combustion space 101. Combustion within the combustion space 101 can be implemented using existing technologies, such as by supplying fuel gas. Since both the sludge treatment space 102 and the combustion space 101 are internal spaces of the furnace body 100, the heat from combustion can be used to rapidly perform sludge drying and carbonization treatment. A discharge switching device 600 is installed in the furnace body 100. The discharge switching device 600 includes a feed inlet, a first discharge outlet, and a second discharge outlet. The feed inlet is connected to the output end of the final process in the sludge treatment space 102 to receive the treated sludge. The first discharge outlet is connected to the combustion space 101, and the second discharge outlet extends to the outside of the furnace body 100 and communicates with the outside. The discharge switching device 600 is configured to feed sludge into the combustion space 101 or to discharge sludge out of the furnace body 100.

[0047] Understandably, the inlet of the discharge switching device 600 is connected to the output end of the sludge treatment space 102, that is, to receive the sludge after drying and carbonization. Through the first discharge port and the second discharge port, the dried and carbonized sludge can be selectively sent into the combustion space 101 for combustion, or sent out for subsequent applications.

[0048] The integrated sludge drying and carbonization furnace of this embodiment, by setting a combustion space 101 and a sludge treatment space 102 in the furnace body 100, can quickly dry and carbonize sludge, and use the discharge switching device 600 to send the treated sludge into the combustion space 101 for combustion, which solves the problem of gas generated during the drying and carbonization process, and sends the sludge into combustion, which can reduce energy consumption and sludge discharge. When necessary, the dried and carbonized sludge can also be discharged, making the application flexible.

[0049] Reference Figure 1 and Figure 2In some embodiments of this application, the furnace body 100 is provided with a combustion cylinder 200, a carbonization cylinder 300, a drying cylinder 400, and a pre-drying cylinder 500 sequentially from the inside out. The combustion cylinder 200 defines a combustion space 101 inside. The carbonization cylinder 300 is fitted outside the combustion cylinder 200, defining a carbonization space between the two. The drying cylinder 400 is fitted outside the carbonization cylinder 300, defining a drying space between the two. The pre-drying cylinder 500 is fitted outside the drying cylinder 400, defining a pre-drying space between the two, and the pre-drying cylinder is provided with a pre-drying feed inlet. The pre-drying space, drying space and carbonization space are connected in sequence and together form the sludge treatment space 102. After the sludge is fed in through the pre-drying inlet, it is fed into the pre-drying space, drying space and carbonization space in sequence for pre-drying, drying and carbonization.

[0050] In this embodiment, the distances from the carbonization cylinder 300, drying cylinder 400, pre-drying cylinder 500 to the combustion cylinder 200 increase sequentially. During the sludge feeding process, the temperature gradient distribution can be utilized. The sludge is pre-dried in the pre-drying space with the lowest temperature, then dried in the drying space with a moderate temperature, and finally carbonized in the carbonization space with the highest temperature. This greatly improves the heat utilization rate and enables efficient drying and carbonization treatment of sludge.

[0051] The pre-drying feed inlet can be equipped with a screw conveyor for feed control. It is understandable that each cylinder can have a conveying structure to actively push the sludge for transport, or it can rely on the thrust of the sludge being fed in to drive the sludge transport; a transfer structure can be set up between the two cylinders to achieve the transfer of sludge between them.

[0052] Reference Figures 1 to 3In some embodiments of this application, the discharge switching device 600 includes a first spiral conveying mechanism 601, a second spiral conveying mechanism 602, and a feed pipe 607. The first spiral conveying mechanism 601 is arranged axially along the combustion cylinder 200 and is configured to convey sludge from the carbonization cylinder 300 into the combustion cylinder 200. The second spiral conveying mechanism 602 is coaxially arranged with the first spiral conveying mechanism 601 and is configured to convey sludge from the carbonization cylinder 300 away from the combustion cylinder 200. The feed pipe 607 is disposed between the first spiral conveying mechanism 601 and the second spiral conveying mechanism 602. The upper end of the feed pipe 607 has an inlet communicating with the carbonization space, and the lower end has an outlet communicating with both the first spiral conveying mechanism 601 and the second spiral conveying mechanism 602. Furthermore, a guide plate 608 is rotatably installed inside the feed pipe 607, and the guide plate 608 is configured to guide the material into the first screw conveyor mechanism 601 or into the second screw conveyor mechanism 602.

[0053] During operation, the carbonized sludge is fed into the feed pipe 607 through the feed inlet, and the guide plate 608 rotates to face the first screw conveyor 601 or the second screw conveyor 602 according to the current conveying requirements.

[0054] Furthermore, the rotation drive of the guide plate 608 can extend out of the furnace body 100 to the outside for rotation control. The specific rotation drive form can be set with reference to relevant existing technologies, and is not specifically limited here.

[0055] In some embodiments of this application, the furnace body 100 further includes a third spiral conveying mechanism 603. The third spiral conveying mechanism 603 is coaxially arranged with the first spiral conveying mechanism 601. The input end of the third spiral conveying mechanism 603 is connected to the pre-drying space, and the output end is connected to the drying space, for transferring sludge from the pre-drying space to the drying space. Furthermore, the first spiral conveying mechanism 601, the second spiral conveying mechanism 602, and the third spiral conveying mechanism 603 are connected to the same drive shaft.

[0056] Combination Figure 3The furnace body 100 has a conveyor housing and a drive shaft coaxially arranged on the right side of the combustion cylinder 200. The conveyor housing and drive shaft pass through the carbonization cylinder 300, the drying cylinder 400, and the pre-drying cylinder 500. The right side of the drive shaft extends out of the conveyor housing and connects to the drive motor. A first spiral conveyor mechanism 601, a second spiral conveyor mechanism 602, and a third spiral conveyor mechanism 603 are arranged sequentially on the drive shaft from left to right, with the first and third spiral blades rotating in the opposite direction to the second spiral blade. The conveyor housing is separated from the second and third spiral blades at the right end of the carbonization cylinder 300. A feed pipe 607 is vertically arranged at the upper end of the conveyor housing, along the axial direction of the drive shaft, in the area between the first and second spiral blades. The pre-dried sludge is fed into the third spiral conveyor mechanism 603, and then conveyed inward through the third spiral blades into the drying cylinder 400. The carbonized sludge is conveyed into the combustion cylinder 200 to the side of the first spiral blade or to the side of the second spiral blade, depending on the inclination direction of the guide plate 608, and then discharged.

[0057] Understandably, within the pre-drying space, a feed window is opened above the third spiral blade for sludge to enter, and within the drying space, a discharge window is opened below the third spiral blade for sludge to exit. An active valve or a normally open connection can be installed on the side of the first spiral conveyor mechanism 601 connected to the combustion cylinder 200.

[0058] Based on the foregoing embodiments, in some embodiments of this application, the discharge switching device 600 further includes a fourth spiral conveying mechanism 604. The input end of the fourth spiral conveying mechanism 604 is connected to the output end of the second spiral conveying mechanism 602 within the carbonization space, and the output end of the fourth spiral conveying mechanism 604 extends outward from the pre-drying cylinder 500. It is understood that because the first spiral conveying mechanism 601, the second spiral conveying mechanism 602, and the third spiral conveying mechanism 603 are coaxially arranged sequentially, the second spiral blades, while conveying the sludge to the side away from the combustion cylinder 200, cannot discharge it outside the furnace body 100. This embodiment, by setting the fourth spiral conveying mechanism 604 to connect to the output end of the second spiral conveying mechanism 602, can bypass the third spiral conveying mechanism 603 and send the carbonized sludge out of the furnace body 100.

[0059] Specifically, the second spiral conveyor mechanism 602, located within the carbonization space, has a discharge window at the bottom right side of the conveyor housing to discharge sludge. The fourth spiral conveyor mechanism 604 connects to this window and extends along the axial direction of the combustion cylinder 200, passing through each cylinder and extending outside the furnace body 100. A sealing valve structure is installed at one end of the fourth spiral conveyor mechanism 604 extending outside the furnace body 100 to maintain the airtightness of the carbonization space.

[0060] Reference Figures 1 to 4 In some embodiments of this application, the furnace body 100 further includes an exhaust mechanism 201, which is disposed in the combustion chamber 200. The exhaust mechanism 201 has an exhaust channel 2011 connecting the combustion space 101 and the carbonization space, and the exhaust channel 2011 has an open state and a closed state. The exhaust mechanism 201 is configured to transport gas in the carbonization space to the combustion space 101.

[0061] It is understandable that pyrolysis oil and gas will be generated during the drying and carbonization process of sludge. In this embodiment, by setting an exhaust mechanism 201 on the combustion cylinder 200, the pyrolysis oil and gas can be discharged into the combustion space 101 for combustion, thus solving the problem of pyrolysis oil and gas emission.

[0062] Specifically, the exhaust mechanism 201 includes a plug 2013 and an elastic element 2012. The plug 2013 is closed within the exhaust passage 2011 and can move towards the combustion space 101 to open the exhaust passage 2011. The elastic element 2012 abuts against the side of the plug 2013 closest to the combustion space 101. Because the pyrolysis oil and gas generated in the carbonization space causes an increase in gas pressure, it can push the plug 2013 to overcome the action of the elastic element 2012, opening the exhaust passage 2011, allowing the pyrolysis oil and gas to automatically enter the combustion space 101, and then automatically reset.

[0063] In practical applications, multiple exhaust mechanisms 201 can be installed on the surface of the combustion cylinder 200 as needed.

[0064] In some embodiments of this application, the carbonization cylinder 300, the drying cylinder 400, and the pre-drying cylinder 500 are coaxially rotatable. The rotation direction of the drying cylinder 400 is opposite to that of the carbonization cylinder 300 and the pre-drying cylinder 500. The inner walls of the carbonization cylinder 300, the drying cylinder 400, and the pre-drying cylinder 500 are provided with lifting plates, which are configured to move the material from one end of each cylinder to the other during rotation.

[0065] After the sludge is fed into the pre-drying cylinder 500, the pre-drying cylinder 500 rotates, pushing the sludge from the first end to the second end for pre-drying. After reaching the second end, it is fed into the drying cylinder 400 and, through the rotation of the drying cylinder 400, is transported from the second end to the first end for drying. After reaching the first end, it is transferred to the carbonization cylinder 300 and, through the rotation of the carbonization cylinder 300, is transported from the first end to the second end. Finally, it is discharged through the discharge switching device 600.

[0066] In some embodiments of this application, a linkage component is provided between two adjacent cylinders to enable the carbonization cylinder 300, drying cylinder 400, and pre-drying cylinder 500 to rotate synchronously. This way, only one cylinder needs a rotation drive to simultaneously drive all three cylinders, simplifying the structure and reducing production costs.

[0067] Specifically, the carbonization cylinder 300, drying cylinder 400, and pre-drying cylinder 500 all include supporting ends at both ends and cylinders connected to these supporting ends. The cylinders are rotatably connected to the supporting ends and maintain a seal between them. A transmission gear ring is provided on the outer circumference of the carbonization cylinder 300, and transmission gear rings are provided on both the inner and outer sides of the drying cylinder 400 and pre-drying cylinder 500. Furthermore, a transmission gear meshing with the transmission gear ring is provided between adjacent cylinders. This transmission gear is rotatably mounted on the corresponding supporting end; for example, the transmission gear between the carbonization cylinder 300 and the drying cylinder 400 is mounted on the supporting end of the drying cylinder 400. The furnace body 100 provides multiple supporting gears on the outer side of the pre-drying cylinder 500. These supporting gears mesh with the transmission gear ring on the outer circumference of the pre-drying cylinder 500 to support it. At least one supporting gear is connected to a drive mechanism. It is also understandable that the furnace body 100 is also equipped with a frame to provide basic support, and the support gears are installed on the frame.

[0068] During operation, the support gear is driven to rotate, causing the pre-drying cylinder 500 to rotate. Under the linkage of the linkage components, the carbonization cylinder 300 rotates synchronously and in the same direction as the pre-drying cylinder 500, while the drying cylinder 400 rotates synchronously in the opposite direction. Each cylinder pushes the sludge in a set direction through lifting plates installed on its inner wall. The lifting plates are distributed in a spiral pattern to push the sludge in the set direction as it rotates with the cylinder.

[0069] In some embodiments, a fifth spiral conveying mechanism 605 is also provided on the left side of the furnace body 100. The fifth spiral conveying mechanism 605 is coaxially arranged with the combustion cylinder 200, connected to the left end of the combustion cylinder 200, and extends out of the furnace body 100. The input end of the fifth spiral conveying mechanism 605 is connected to the drying space, and the output end is connected to the carbonization space. In addition, the pre-drying feed inlet is located on the left side of the pre-drying cylinder 500, and a spiral conveying mechanism is used for feeding. Furthermore, the right side of the pre-drying cylinder 500, the left side of the drying cylinder 400, and the right side of the carbonization cylinder 300 are all provided with material-dispensing plates inside. When the cylinder rotates, the side of the material-dispensing plate facing the sludge has a concave part, so that the material-dispensing plate can scoop up the sludge, and then pour the sludge downwards when it rotates to the top, so that it enters the corresponding spiral conveying mechanism.

[0070] It should be noted that during operation, the sludge does not fill every processing space, but is conveyed at the bottom of each cylinder by the action of the lifting plates.

[0071] In some embodiments, a gas burner is provided on the left side of the combustion chamber 200 in the furnace body 100 for combustion. Its specific structure and combustion control can be set according to relevant existing technologies. In addition, the combustion chamber 200 is also provided with a smoke exhaust structure, and the pre-drying chamber 500 is provided with a dehumidification structure.

[0072] In some embodiments, the combustion cylinder 200 is provided with a sixth spiral conveying mechanism 606 to discharge the ash after combustion.

[0073] The embodiments of the present invention also propose a sludge treatment method, applied to the integrated sludge drying and carbonization furnace of any of the above embodiments, comprising:

[0074] The sludge to be treated is sent into the sludge treatment space 102 of the furnace body 100 to complete the carbonization treatment;

[0075] The carbonized sludge is sent into the combustion space 101 of the furnace body 100 for combustion.

[0076] Understandably, this method solves the problem of gas generated during the drying and carbonization process by directly feeding the carbonized sludge into the combustion space 101 for combustion, and by feeding the sludge into the combustion space, it can reduce energy consumption and sludge emissions.

[0077] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A sludge drying and carbonization integrated furnace, characterized in that, include: The furnace body defines a combustion space and a sludge treatment space. The combustion space is configured to provide heat through combustion, and the sludge treatment space is configured to perform sludge drying and carbonization treatment based on the heat provided by the combustion space. The discharge switching device is installed in the furnace body and includes a feed inlet, a first discharge outlet and a second discharge outlet. The feed inlet is connected to the output end of the end process of the sludge treatment space to receive the treated sludge. The first discharge outlet is connected to the combustion space and the second discharge outlet extends to the outside of the furnace body and is connected to the outside. The discharge switching device is configured to send sludge into the combustion space or send sludge out of the furnace body. The furnace body includes: a combustion cylinder, the interior of which defines the combustion space; a carbonization cylinder, which is sleeved on the outside of the combustion cylinder and defines a carbonization space between the two; a drying cylinder, which is sleeved on the outside of the carbonization cylinder and defines a drying space between the two; and a pre-drying cylinder, which is sleeved on the outside of the drying cylinder and defines a pre-drying space between the two, and the pre-drying cylinder is provided with a pre-drying inlet; wherein the pre-drying space, the drying space, and the carbonization space are sequentially connected and together form the sludge treatment space, and the sludge is fed in through the pre-drying inlet and then sequentially fed into the pre-drying space, the drying space, and the carbonization space for pre-drying, drying, and carbonization; The discharge switching device includes: a first spiral conveying mechanism, which is arranged axially along the combustion cylinder and configured to convey material from the carbonization cylinder to the combustion cylinder; a second spiral conveying mechanism, which is coaxially arranged with the first spiral conveying mechanism and configured to convey material from the carbonization cylinder to a direction away from the combustion cylinder; and a feed pipe, which is disposed between the first spiral conveying mechanism and the second spiral conveying mechanism, with an inlet at the upper end of the feed pipe communicating with the carbonization space and an outlet at the lower end communicating with both the first spiral conveying mechanism and the second spiral conveying mechanism, and a guide plate rotatably disposed inside the feed pipe, the guide plate being configured to guide material into the first spiral conveying mechanism or into the second spiral conveying mechanism; The furnace body also includes a third spiral conveying mechanism, which is coaxially arranged with the first spiral conveying mechanism. The input end of the third spiral conveying mechanism is connected to the pre-drying space, and the output end is connected to the drying space. The first spiral conveying mechanism, the second spiral conveying mechanism, and the third spiral conveying mechanism are connected to the same transmission main shaft.

2. The integrated sludge drying and carbonization furnace according to claim 1, characterized in that, The discharge switching device also includes a fourth spiral conveyor mechanism. The input end of the fourth spiral conveyor mechanism is connected to the output end of the second spiral conveyor mechanism within the carbonization space, and the output end of the fourth spiral conveyor mechanism extends out of the outside of the pre-drying cylinder.

3. The integrated sludge drying and carbonization furnace according to claim 1, characterized in that, The furnace body also includes: An exhaust mechanism is provided in the combustion cylinder, and the exhaust mechanism is provided with an exhaust channel connecting the combustion space and the carbonization space. The exhaust channel has an open state and a closed state. The exhaust mechanism is configured to deliver gas from the carbonization space to the combustion space.

4. The integrated sludge drying and carbonization furnace according to claim 3, characterized in that, The exhaust mechanism includes a plug and an elastic element. The plug is closed in the exhaust passage and can move towards the combustion space to open the exhaust passage. The elastic element abuts against the side of the plug near the combustion space.

5. The integrated sludge drying and carbonization furnace according to claim 1, characterized in that, The carbonization cylinder, the drying cylinder, and the pre-drying cylinder are arranged to rotate coaxially. The rotation direction of the drying cylinder is opposite to that of the carbonization cylinder and the pre-drying cylinder. The inner walls of the carbonization cylinder, the drying cylinder, and the pre-drying cylinder are provided with lifting plates, which are configured to move the material from one end of each cylinder to the other during rotation.

6. The integrated sludge drying and carbonization furnace according to claim 5, characterized in that, A linkage assembly is provided between two adjacent cylinders to enable the carbonization cylinder, the drying cylinder, and the pre-drying cylinder to rotate synchronously.

7. A sludge treatment method, characterized in that, The sludge drying and carbonization integrated furnace described in any one of claims 1 to 6 comprises: The sludge to be treated is sent into the sludge treatment space of the furnace to complete the carbonization process. The carbonized sludge is sent into the combustion space of the furnace for combustion.

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