Cracking furnace

Abstract

The application relates to the technical field of cracking furnaces, in particular to a cracking furnace which comprises a furnace body, a scraper and a conveying pipe assembly, the scraper is arranged in the furnace body, the scraper comprises an inner layer and an outer layer, and the outer layer is wrapped outside the inner layer; the inner layer is formed with a first containing cavity, and a second containing cavity is formed between the outer layer and the inner layer; part of the structure of any conveying pipe assembly is arranged in the furnace body, and the other part of the structure of the conveying pipe assembly is arranged outside the furnace body; any conveying pipe assembly comprises a cooling pipe and a sleeve pipe, the sleeve pipe is sleeved outside the cooling pipe, a conveying cavity is formed between the sleeve pipe and the cooling pipe, the inside of the cooling pipe is communicated with the first containing cavity, the conveying cavity is communicated with the second containing cavity, and the outer layer is formed with a gas injection port. The scraper is designed as a double-layer structure, the inner layer is communicated with cooling liquid, and the outer layer is communicated with nitrogen, so that the problem of frequent water leakage of the scraper can be avoided, nitrogen can be blown to the reaction area in the cracking furnace, an air curtain is formed on the inner wall of the furnace, and coking of the furnace wall can be effectively avoided.

Description

Technical Field

[0001] This application relates to the field of pyrolysis furnace technology, and in particular to a pyrolysis furnace. Background Technology

[0002] The pyrolysis furnace is a key reaction device for the production of carbon black from acetylene cracking. However, during the high-temperature pyrolysis process, hydrocarbons are prone to undergoing deep dehydrogenation and polymerization side reactions, leading to the continuous deposition of the generated carbon black on the furnace wall, a phenomenon known as coking. Coking not only reduces heat transfer efficiency and increases energy consumption but also causes safety hazards such as localized overheating, blockage of furnace pipes, and even equipment damage. To alleviate the coking problem, a scraper decoking technique is generally used, which periodically moves up and down to remove the coke layer adhering to the furnace wall.

[0003] However, the large scraper also faces a series of challenges during operation. Specifically, due to dynamic high-temperature wear and sudden temperature changes between the scraper and the furnace body, cooling water leaks into the furnace during operation. This leakage not only affects the pyrolysis reaction but also triggers a violent gasification reaction between water and high-temperature carbon black (H2O+C=CO+H2), causing pressure fluctuations in the furnace and posing a danger. Routine inspections cannot detect minor leaks in time, and continuous leakage may exacerbate coking and lead to production shutdowns. Utility Model Content

[0004] The purpose of this application is to provide a pyrolysis furnace that, to a certain extent, solves the technical problem in the prior art where the large scraper, due to dynamic high-temperature wear with the furnace body and sudden temperature changes, causes cooling water to leak into the furnace during operation. This leakage not only affects the pyrolysis reaction but also causes dangerous pressure fluctuations within the furnace.

[0005] This application provides a pyrolysis furnace, including: a furnace body, a scraper, and multiple conveying pipe assemblies; wherein, the scraper is disposed within the furnace body and is used to clean the furnace wall of the furnace body; the scraper includes an inner layer and an outer layer, with the outer layer covering the outside of the inner layer; the inner layer forms a first receiving cavity, and a second receiving cavity is formed between the outer layer and the inner layer; a portion of the structure of any one of the conveying pipe assemblies is disposed within the furnace body, and another portion is disposed outside the furnace body; at least one of the conveying pipe assemblies is used to convey cooling liquid and protective gas outside the furnace body to the scraper, and at least one of the conveying pipe assemblies is used to convey cooling liquid and protective gas inside the scraper to the outside of the furnace body; Each of the aforementioned conveying pipe assemblies includes a cooling pipe and a sleeve, wherein the sleeve is fitted over the outside of the cooling pipe, and a conveying cavity is formed between the sleeve and the cooling pipe; the interior of the cooling pipe is connected to the first receiving cavity, and cooling liquid can be input to or output from the first receiving cavity via the cooling pipe; the conveying cavity is connected to the second receiving cavity, and protective gas can be input to or output from the second receiving cavity via the conveying cavity; the outer layer is formed with an air jet, and the protective gas in the second receiving cavity can be sprayed onto the furnace wall of the furnace body via the air jet to form an air curtain on the furnace wall and prevent coking.

[0006] In the above technical solution, the jet nozzle is further formed on the outer layer on the side near the furnace body.

[0007] In any of the above technical solutions, the jet nozzle is further converging along the jet direction of the protective gas.

[0008] In any of the above technical solutions, both the inner layer and the outer layer are annular tube structures, and the number of jet nozzles is multiple, which are sequentially spaced along the circumference of the annular outer layer.

[0009] In any of the above technical solutions, the pyrolysis furnace further includes an inlet pipe and an outlet pipe, at least one end of the cooling pipe away from the scraper is connected to the inlet pipe, and at least one end of the cooling pipe away from the scraper is connected to the outlet pipe.

[0010] In any of the above technical solutions, the water inlet pipe is further provided with a first flow regulating valve, a first flow sensor, and a first pressure sensor; The outlet pipe is equipped with a second flow regulating valve, a second flow sensor, and a second pressure sensor.

[0011] In any of the above technical solutions, the pyrolysis furnace further includes a support frame, a drive device, and a mounting base; wherein the support frame is disposed outside the top of the furnace body along its height direction, and the drive device is disposed on the support frame; the support frame forms a receiving cavity and a bottom opening along its height direction; the top of the furnace body along its height direction forms two clearance openings corresponding to the bottom opening, and the two conveying pipe assemblies are movably inserted into the two corresponding clearance openings; The mounting base is disposed within the receiving cavity and is connected to the output end of the driving device; both conveying pipe assemblies are disposed on the mounting base; the driving device can drive the mounting base to synchronously move the two conveying pipe assemblies and the scraper along the height direction of the furnace body to clean the side wall of the furnace body.

[0012] In any of the above technical solutions, the pyrolysis furnace further includes a control device, an alarm, and a limit switch; wherein the limit switch is disposed on the side of the drive device and located above the conveying pipe assembly along the moving path of the conveying pipe assembly, and the limit switch is used to detect the stroke of the scraper; the control device is communicatively connected to the first flow regulating valve, the first flow sensor, the second flow regulating valve, the second flow sensor, the valve at the feed inlet of the pyrolysis furnace, and the limit switch.

[0013] In any of the above technical solutions, a dynamic sealing component is further provided between the drive end of the drive device and the mounting base.

[0014] In any of the above technical solutions, the driving device is further described as a hydraulic cylinder.

[0015] In any of the above technical solutions, the pyrolysis furnace further includes an inlet pipe and an outlet pipe; wherein, at least one end of the conveying chamber of the conveying pipe assembly away from the scraper is connected to the inlet pipe, and at least one end of the conveying chamber of the conveying pipe assembly away from the scraper is connected to the outlet pipe.

[0016] In any of the above technical solutions, the air intake pipe is further provided with a third flow regulating valve.

[0017] In any of the above technical solutions, the exhaust pipe is further provided with a fourth flow regulating valve.

[0018] Compared with the prior art, the beneficial effects of this application are as follows: The pyrolysis furnace provided in this application redesigns the cooling structure of the internal scraper, making the scraper a sandwich structure with an inner and outer layer. The inner layer is circulated with cooling liquid, and the outer layer is circulated with protective gas. This not only avoids the problem of frequent water leakage from the scraper, but also allows nitrogen to be blown into the reaction zone inside the pyrolysis furnace through the jet nozzle, forming an air curtain on the furnace wall, thereby effectively preventing the problem of coking on the furnace wall. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the pyrolysis furnace provided in the embodiments of this application; Figure 2 This is a schematic diagram of the scraper provided in an embodiment of this application.

[0021] Figure label: 1-Furnace body, 101-Feed inlet, 2-Scraper, 201-Inner layer, 202-Outer layer, 203-First receiving cavity, 204-Second receiving cavity, 205-Air jet, 3-Conveying pipe assembly, 31-Cooling pipe, 32-Sheath, 33-Conveying cavity, 6-Water inlet pipe, 7-First flow regulating valve, 8-First flow sensor, 9-First pressure sensor, 10-Water outlet pipe, 11-Second flow sensor, 12-Second pressure sensor, 13-Second flow regulating valve, 14-Air inlet pipe, 15-Third flow regulating valve, 16-Air outlet pipe, 17-Fourth flow regulating valve, 18-Support frame, 19-Drive device, 20-Mounting base, 21-Limit switch, 22-Dynamic sealing component. Detailed Implementation

[0022] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0023] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0024] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] The following reference Figure 1 and Figure 2 This application describes a pyrolysis furnace according to some embodiments.

[0028] See Figure 1 and Figure 2 As shown, an embodiment of this application provides a pyrolysis furnace, including: a furnace body 1, a scraper 2, and two conveying pipe assemblies 3; wherein, the scraper 2 is disposed inside the furnace body 1 and is used to clean the furnace wall of the furnace body 1; the scraper 2 includes an inner layer 201 and an outer layer 202, and the outer layer 202 covers the outside of the inner layer 201; the inner layer 201 forms a first receiving cavity 203, and a second receiving cavity 204 is formed between the outer layer 202 and the inner layer 201; a portion of the structure of any one of the conveying pipe assemblies 3 is disposed inside the furnace body 1, and another portion of its structure is disposed outside the furnace body 1; one of the two conveying pipe assemblies 3 is used to convey cooling liquid, such as cooling water, and protective gas, such as nitrogen, from outside the furnace body 1 to the scraper 2, and the other is used to convey cooling liquid and protective gas inside the scraper 2 to the outside of the furnace body 1; Each conveying pipe assembly 3 includes a cooling pipe 31 and a sleeve 32, with the sleeve 32 fitted over the outside of the cooling pipe 31, and a conveying cavity 33 formed between the sleeve 32 and the cooling pipe 31; the interior of the cooling pipe 31 is connected to the first receiving cavity 203, and cooling liquid can be input to or output from the first receiving cavity 203 through the cooling pipe 31; the conveying cavity 33 is connected to the second receiving cavity 204, and protective gas can be input to or output from the second receiving cavity 204 through the conveying cavity 33; the outer layer 202 has a jet nozzle 205, and the protective gas in the second receiving cavity 204 can be sprayed onto the furnace wall of the furnace body 1 through the jet nozzle 205 to form an air curtain on the furnace wall and prevent coking.

[0029] In other embodiments, there are three or more conveying pipe assemblies 3, at least one conveying pipe assembly 3 is used to convey cooling liquid, such as cooling water, and protective gas, such as nitrogen, from outside the furnace body 1 to the scraper 2, and at least one conveying pipe assembly 3 is used to convey cooling liquid and protective gas inside the scraper 2 to the outside of the furnace body 1.

[0030] As can be seen from the structure described above, the scraper 2 includes an inner layer 201 and an outer layer 202, forming a sandwich structure. The inner layer is circulated with cooling liquid, and the outer layer is circulated with protective gas such as nitrogen. This not only avoids the problem of frequent water leakage from the scraper, but also allows protective gas such as nitrogen to be blown into the reaction zone inside the cracking furnace through the jet nozzle 205, forming an air curtain on the inner wall of the furnace, thereby effectively preventing the problem of coking on the furnace wall.

[0031] In this embodiment, preferably, as follows: Figure 1 and Figure 2 As shown, the jet nozzle 205 is formed on the side of the outer layer 202 near the furnace body 1. As can be seen from the structure described above, the jet nozzle 205 is located close to the side wall of the furnace body 1, so that protective gas can be quickly sprayed onto the furnace wall nearby.

[0032] It should be noted that the jet nozzle 205 is not limited to being installed on the side wall near the furnace body 1, but can also be arranged in a different position according to actual needs. In this embodiment, preferably, as follows: Figure 2 As shown, the nozzle 205 tapers along the direction of the protective gas injection. As can be seen from the structure described above, using a tapered nozzle 205 along the direction of the protective gas injection can increase the jet velocity and accelerate the formation of the air curtain. Of course, the nozzle 205 is not limited to a tapered shape; it can also be an opening of the same diameter or other shapes, depending on the actual needs. In this embodiment, preferably, as follows: Figure 2As shown, both the inner layer 201 and the outer layer 202 are annular tube structures, and the outer annular tube is sleeved outside the inner annular tube, making the scraper annular. This allows for maximum cleaning of the entire circumferential inner wall of the furnace body 1, which helps to improve the cleaning effect.

[0033] Furthermore, preferably, there are multiple jet nozzles 205, which are sequentially spaced along the circumference of the annular outer layer 202, so as to spray air onto the inner sidewall of the entire circumference of the furnace body 1 to form a large-area air curtain and improve the effect of preventing coking.

[0034] In this embodiment, preferably, as follows: Figure 1 As shown, the pyrolysis furnace also includes a water inlet pipe 6 and a water outlet pipe 10. One end of a cooling pipe 31, away from the scraper, is connected to the water inlet pipe, and the other end of a cooling pipe 31, away from the scraper, is connected to the water outlet pipe. As can be seen from the structure described above, cooling liquid can be delivered to one of the cooling pipes 31 through the inlet pipe 6, and then delivered to the scraper 2. After flowing through the scraper 2, it is discharged to the outlet pipe 10 through the other cooling pipe 31, and finally discharged to the designated area through the outlet pipe 10. In this embodiment, preferably, as follows: Figure 1 As shown, the water inlet pipe 6 is equipped with a first flow regulating valve 7, a first flow sensor 8, and a first pressure sensor 9.

[0035] As can be seen from the structure described above, the flow rate of the incoming coolant can be detected at any time using the first flow sensor 8; the pressure of the incoming coolant can be detected using the first pressure sensor 9; and the flow rate of the incoming coolant can be adjusted using the first flow regulating valve 7.

[0036] In this embodiment, preferably, as follows: Figure 1 As shown, the water outlet pipe 10 is equipped with a second flow regulating valve 13, a second flow sensor 11, and a second pressure sensor 12. As can be seen from the structure described above, the flow rate of the discharged coolant can be detected at any time using the second flow sensor 11; the pressure of the discharged coolant can be detected using the second pressure sensor 12; and the flow rate of the discharged coolant can be adjusted using the second flow regulating valve 13. In this embodiment, preferably, as follows: Figure 1As shown, the pyrolysis furnace also includes a support frame 18, a drive device 19, and a mounting base 20; wherein, the support frame 18 is disposed outside the top of the furnace body 1 along its height direction, and the drive device 19 is disposed on the support frame 18; the support frame 18 forms a receiving cavity and a bottom opening along its height direction; the top of the furnace body 1 along its height direction forms two clearance openings corresponding to the bottom opening, and the two conveying pipe assemblies 3 are movably inserted into the two corresponding clearance openings. The mounting base 20 is disposed in the receiving cavity and is connected to the output end of the drive device 19 through the mounting base 20; both conveying pipe assemblies 3 are disposed on the mounting base 20, that is, both conveying pipe assemblies 3 are fixed to this mounting base 20; the drive device 19 can drive the mounting base to synchronously move the two conveying pipe assemblies 3 and the scraper 2 along the height direction of the furnace body 1 to clean the side wall of the furnace body 1. As can be seen from the structure described above, the drive device 19 can drive the mounting base 20 to move the scraper 2 synchronously along the height direction of the furnace body 1 to scrape the coke from the side wall of the furnace body 1, that is, to clean it.

[0037] Furthermore, preferably, the drive device 19 can be located at the top of the support frame 18 along its height direction, which facilitates installation and does not occupy the internal space of the support frame 18. Moreover, structural components can be installed within the internal space of the support frame 18 without interference. Of course, this is not the only option; the drive device 19 can also be installed in other positions on the support frame 18, depending on actual needs.

[0038] Furthermore, preferably, the mounting base 20 has two mounting through holes, and the two conveying pipe assemblies 3 are inserted into the two corresponding mounting through holes. The conveying pipe assemblies 3 are connected to the mounting base 20 by bolts, welding, snap-fit ​​or interference fit, depending on the actual needs.

[0039] Furthermore, preferably, the mounting base 20 can be a disc-shaped structure. Of course, it is not limited to this and can be selected according to actual needs.

[0040] Furthermore, preferably, a dynamic sealing component 22 is provided between the drive end of the drive device 19 and the mounting base 20. In addition, a dynamic sealing structure is also provided between the conveying pipe assembly 3 and the clearance opening of the furnace body 1 to achieve dynamic sealing.

[0041] In this embodiment, preferably, as follows: Figure 1As shown, the pyrolysis furnace also includes a control device, an alarm, and a limit switch 21; wherein, the limit switch 21 is located on the side of the drive device 19 and above the conveying pipe assembly 3 along the moving path of the conveying pipe assembly 3, and the limit switch 21 is used to detect the stroke of the conveying pipe assembly 3, that is, the stroke of the scraper 2; the control device is communicatively connected to the first flow regulating valve 7, the first flow sensor 8, the second flow regulating valve 13, the second flow sensor 11, the valve of the feed inlet 101 of the pyrolysis furnace, and the limit switch 21. As can be seen from the structure described above, by adding flow sensors to the inlet pipe 6 and the outlet pipe 10, the status of the cooling liquid can be monitored in real time by the monitoring system. If the inlet flow rate is greater than the outlet flow rate, it indicates that the scraper 2 is leaking water. The control device will alarm and notify the operator through the alarm. If the operator does not notice the alarm in time, the control device will automatically control the first flow regulating valve 7 and the valve of the feed port 101 of the pyrolysis furnace to close, stop the supply of cooling liquid and the feeding into the pyrolysis furnace, and then execute the shutdown steps in sequence according to the operation process until the shutdown is completed. In addition, scraper 2 may sometimes disconnect from drive unit 19 due to mechanical reasons, causing scraper 2 to stop running but production to continue, and the pyrolysis furnace to continue pyrolysis. This can easily aggravate coking problems and quickly burn out the large scraper 2. Therefore, limit switch 21 is installed on the side of drive unit 19 to detect the stroke of scraper 2. If scraper 2 stops running, limit switch 21 will detect that the stroke of scraper 2 has not changed, and then output the information to control device. Control device can control alarm to sound an alarm in time to inform operators. If the alarm is not detected in time, control device will automatically execute alarm procedure, control the valve of feed port 101 of pyrolysis furnace and the first flow regulating valve 7 to close, that is, interlock to stop feeding and supply of cooling liquid, and execute the shutdown steps in sequence according to the operation process until shutdown is completed.

[0042] In this embodiment, preferably, as follows: Figure 1 As shown, the drive device 19 is a hydraulic cylinder, which has a simple structure and reliable operation. When used to achieve reciprocating motion, a reduction gear can be eliminated, and there is no transmission backlash, resulting in smooth movement. Of course, the type of drive device 19 is not limited to this; it can also be other types of telescopic cylinders.

[0043] In this embodiment, preferably, as follows: Figure 1 As shown, the pyrolysis furnace also includes an inlet pipe 14 and an outlet pipe 16; wherein, the end of the conveying chamber 33 of one of the conveying pipe assemblies 3 that is away from the scraper 2 is connected to the inlet pipe 14, and the end of the conveying chamber 33 of the other conveying pipe assembly 3 that is away from the scraper 2 is connected to the outlet pipe 16. As can be seen from the structure described above, protective gas can be delivered into the delivery chamber 33 of one of the delivery pipe assemblies 3 through the air inlet pipe 14, and then delivered to the scraper 2. After the gas has flowed through the scraper 2, it is discharged to the air outlet pipe 16 through the delivery chamber 33 of the other delivery pipe assembly 3, and finally discharged to the designated area through the air outlet pipe 16. In this embodiment, preferably, as follows: Figure 1 As shown, the intake pipe 14 is equipped with a third flow regulating valve 15, which can be used to regulate the flow rate of the incoming protective gas. In this embodiment, preferably, as follows: Figure 1 As shown, the outlet pipe 16 is equipped with a fourth flow regulating valve 17, which can be used to regulate the flow rate of the discharged protective gas. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A pyrolysis furnace, characterized in that, include: The furnace body, scraper, and multiple conveying pipe assemblies are provided. The scraper is disposed within the furnace body and is used to clean the furnace wall. The scraper includes an inner layer and an outer layer, with the outer layer covering the outside of the inner layer. The inner layer forms a first receiving cavity, and a second receiving cavity is formed between the outer layer and the inner layer. A portion of each conveying pipe assembly is disposed within the furnace body, and another portion is disposed outside the furnace body. At least one conveying pipe assembly is used to convey cooling liquid and protective gas from outside the furnace body to the scraper, and at least one conveying pipe assembly is used to convey cooling liquid and protective gas from inside the scraper to the outside of the furnace body. Each of the aforementioned conveying pipe assemblies includes a cooling pipe and a sleeve, wherein the sleeve is fitted over the outside of the cooling pipe, and a conveying cavity is formed between the sleeve and the cooling pipe; the interior of the cooling pipe is connected to the first receiving cavity, and cooling liquid can be input to or output from the first receiving cavity via the cooling pipe; the conveying cavity is connected to the second receiving cavity, and protective gas can be input to or output from the second receiving cavity via the conveying cavity; the outer layer is formed with an air jet, and the protective gas in the second receiving cavity can be sprayed onto the furnace wall of the furnace body via the air jet to form an air curtain on the furnace wall and prevent coking.

2. The pyrolysis furnace according to claim 1, characterized in that, The jet nozzle is formed on the outer layer on the side near the furnace body.

3. The pyrolysis furnace according to claim 1, characterized in that, The nozzle tapers in the direction of the protective gas injection.

4. The pyrolysis furnace according to claim 1, characterized in that, Both the inner and outer layers are annular tube structures, and there are multiple air jets arranged sequentially at intervals along the circumference of the annular outer layer.

5. The pyrolysis furnace according to claim 1, characterized in that, The pyrolysis furnace also includes an inlet pipe and an outlet pipe, at least one end of the cooling pipe away from the scraper is connected to the inlet pipe, and at least one end of the cooling pipe away from the scraper is connected to the outlet pipe.

6. The pyrolysis furnace according to claim 5, characterized in that, The inlet pipe is equipped with a first flow regulating valve, a first flow sensor, and a first pressure sensor; The outlet pipe is equipped with a second flow regulating valve, a second flow sensor, and a second pressure sensor.

7. The pyrolysis furnace according to claim 6, characterized in that, The pyrolysis furnace further includes a support frame, a drive device, and a mounting base; wherein, the support frame is disposed outside the top of the furnace body along its height direction, and the drive device is disposed on the support frame; the support frame forms a receiving cavity and a bottom opening along its height direction; the top of the furnace body along its height direction forms two clearance openings corresponding to the bottom opening, and the two conveying pipe assemblies are movably inserted into the two corresponding clearance openings. The mounting base is disposed within the receiving cavity and is connected to the output end of the driving device; both conveying pipe assemblies are disposed on the mounting base; the driving device can drive the mounting base to synchronously move the two conveying pipe assemblies and the scraper along the height direction of the furnace body to clean the side wall of the furnace body.

8. The pyrolysis furnace according to claim 7, characterized in that, The pyrolysis furnace also includes a control device, an alarm, and a limit switch; wherein the limit switch is disposed on the side of the drive device and located above the conveying pipe assembly along the movement path of the conveying pipe assembly, and the limit switch is used to detect the stroke of the scraper; the control device is communicatively connected to the first flow regulating valve, the first flow sensor, the second flow regulating valve, the second flow sensor, the valve at the feed inlet of the pyrolysis furnace, and the limit switch; and / or A dynamic sealing component is further provided between the drive end of the drive device and the mounting base; and / or The driving device is a hydraulic cylinder.

9. The pyrolysis furnace according to claim 1, characterized in that, The pyrolysis furnace further includes an inlet pipe and an outlet pipe; wherein, at least one end of the conveying chamber of the conveying pipe assembly away from the scraper is connected to the inlet pipe, and at least one end of the conveying chamber of the conveying pipe assembly away from the scraper is connected to the outlet pipe.

10. The pyrolysis furnace according to claim 9, characterized in that, The air intake pipe is equipped with a third flow regulating valve; and / or The air outlet pipe is equipped with a fourth flow regulating valve.

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