A cracking furnace with a flow regulation function

Abstract

The present invention discloses a cracking furnace with a flow regulation function, which relates to the technical field of cracking furnaces. The cracking furnace includes a bearing device, a regulation device, a combustion device, a quench cooler and a steam drum. The bearing device is communicated with the quench cooler, the steam drum is connected to the bearing device through a pipeline, the combustion device is connected to the bearing device through a pipeline, the regulation device is connected to the bearing device. The bearing device includes a furnace body, and the furnace body includes a convection chamber and a radiation chamber. A fitting chamber is provided between the convection chamber and the radiation chamber. The regulation device is placed in the fitting chamber and is used to adjust the raw material heat exchange stroke in the fitting chamber. The space in the furnace body is distributed in a three-section manner, namely, the convection chamber for preheating the raw materials, the radiation chamber for carrying out the cracking reaction, and the fitting chamber for connecting the two chambers and adjusting the heat exchange stroke. By setting the chambers separately, the flue gas for cracking can be sequentially passed through and flow out after experiencing multiple heat exchanges, improving the utilization rate of heat and reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of cracking furnaces, and specifically to a cracking furnace with a flow regulation function. Background Art

[0002] A cracking furnace is generally a device used for the cracking reaction of petrochemical media. Through the cracking reaction, large-molecule raw materials are split into smaller molecules, such as cracking to produce ethylene, propylene, tetrafluoroethylene, vinylidene fluoride, hexafluoropropylene, etc.

[0003] The cracking reaction generally takes place in the furnace chamber of the cracking furnace. High temperature is provided by fuel combustion, causing long-chain hydrocarbons to break. Before the cracking reaction, the raw materials are preheated by combustion flue gas, which can improve energy utilization efficiency and reduce energy consumption. However, due to the volatility of raw material transportation and the relatively fixed space for the cracking reaction, general cracking furnaces cannot automatically adjust the preheating time according to the feed rate of raw material transportation, resulting in fluctuations in the temperature of the raw materials undergoing the cracking reaction in the furnace tubes of the cracking furnace. For example, Patent CN111944556A provides a heat exchange system for an ethylene cracking furnace, which preheats the raw materials by recovering the heat of the flue gas. Combining with the attached drawings, it can be seen that the preheating process of the raw materials during cracking is fixed.

[0004] Therefore, conventional cracking furnaces cannot adaptively regulate the fluctuations in raw material transportation. When overheated, coking is likely to occur and a coke layer is formed, while when the temperature is insufficient, the cracking efficiency will be greatly affected, unable to meet the requirements of automated production. Summary of the Invention

[0005] The purpose of the present invention is to provide a cracking furnace with a flow regulation function to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The cracking furnace includes a bearing device, a regulation device, a combustion device, a quench cooler, and a steam drum. The bearing device is connected to the quench cooler, the steam drum is connected to the bearing device through a pipeline, the combustion device is connected to the bearing device through a pipeline, the regulation device is connected to the bearing device. The bearing device includes a furnace body, the furnace body includes a convection chamber and a radiation chamber, there is a fitting chamber between the convection chamber and the radiation chamber, the regulation device is placed in the fitting chamber, and the regulation device is used to adjust the heat exchange travel of the raw materials in the fitting chamber.

[0008] The raw materials are pyrolyzed in a pyrolysis furnace. The furnace body of the loading device is used to provide a pyrolysis space, and the combustion device is used to increase the temperature required for the pyrolysis reaction. The regulation device is used to adjust the heat exchange stroke of the raw materials. According to the amount of raw material feeding, the heat exchange stroke is adjusted in real time to ensure the heat exchange temperature, that is, the more the raw material feeding amount, the longer the heat exchange stroke in the limited space of the anastomosis cavity, so as to improve the heat exchange quality. The space in the furnace body is distributed in a three-section manner, namely, the convection cavity for preheating the raw materials, the radiation cavity for carrying out the pyrolysis reaction, and the anastomosis cavity for connecting the two cavities and adjusting the heat exchange stroke. Through the chamber division setting, the flue gas used for pyrolysis can be sequentially connected in series and flow out after experiencing multiple heat exchanges, improving the utilization rate of heat and reducing energy consumption. The steam drum is used to provide dilution steam and enters the convection cavity together with the raw materials. The gas after the pyrolysis reaction is oil-cooled by a quench cooler to prevent secondary reaction of the pyrolysis gas and affect the pyrolysis quality.

[0009] Further, the loading device further includes a feed pipe, a steam pipe and a furnace tube. One end of the feed pipe is inserted into the convection cavity, the feed pipe is communicated with the steam pipe, the furnace tube is placed in the radiation cavity, and the outlet of the steam drum is communicated with the steam pipe through a pipeline;

[0010] The regulation device includes a connecting pipe and an extension component. The end of the feed pipe is communicated with the connecting pipe. The connecting pipe is placed in the anastomosis cavity. The end of the connecting pipe is communicated with the furnace tube through a pipeline. The length of the connecting pipe is adjustable. The extension component is placed in the connecting pipe and is used to adjust the heat exchange stroke of the connecting pipe.

[0011] The feed pipe is used to supply raw materials. The steam pipe is connected to the steam drum to provide dilution steam into the feed pipe and enter the convection cavity together with the raw materials. It is preheated by the high-temperature flue gas in the convection cavity and then enters the connecting pipe after preheating. The connecting pipe adopts a pipeline with adjustable length. When the feeding amount of the raw materials changes, the length and inclination angle of the connecting pipe are controlled by the extension component, so as to adjust the preheating time of the raw materials and keep the temperature of the raw materials entering the furnace tube stable, thus ensuring the pyrolysis quality.

[0012] Further, the connecting pipe is sequentially provided with an induction section and a stretching section along the feeding direction. The induction section is communicated with the end of the feed pipe through a pipeline. The end of the stretching section is communicated with the furnace tube through a pipeline. A transmission groove is provided on the connecting pipe, and the transmission groove is located in the induction section. The extension component includes a windward plate, a transmission piece and an elastic piece. The transmission piece is slidably communicated with the transmission groove. The windward plate is fixedly connected to the transmission piece. The elastic piece is arranged in an arc shape. One end of the elastic piece is fixedly connected to the wall of the induction section, and the other end is fixedly connected to the end of the transmission piece.

[0013] The connecting pipe is set up in sections, and the inlet of the induction section is connected to the end of the feed pipe. When the preheated raw materials enter the connecting pipe, the temperature is fine-tuned according to the feed amount of the raw materials. When the raw materials impact the windward plate, the impact energy conversion drives the transmission plate to move horizontally along the transmission groove. The other end of the transmission plate is connected to the elastic plate. When the transmission plate moves, one end of the elastic plate is fixed on the wall of the induction section pipe, and the other end is linked to the transmission plate. The elastic plate will deform as the transmission plate moves, thereby adjusting the curvature. In the initial state, the curvature of the elastic sheet is the largest. When the raw material feed is the standard value, the windward plate is driven to move to the calibrated position, and the elastic sheet is deformed through the transmission sheet, so that the curvature reaches the standard value. When the airflow flows through the curved surface of the elastic sheet, it moves along the curved surface under the action of the wall attachment, and the jet rushes to the wall of the stretching section. The length from contact to separation of the elastic sheet is defined as the wall attachment length, thereby generating a lateral force on the stretching section. This lateral force has a vertical component, and the stretching section is stretched by this component until it reaches a stable length; when the raw material feed increases, the impact force on the windward plate increases, the elastic sheet is further deformed, and the curvature decreases, thereby extending the wall attachment length. As the wall attachment length is extended, the angle between the jet direction after separation and the horizontal direction increases, thereby increasing the vertical component, driving the stretching section to further stretch, extending the heat exchange stroke, and ensuring the heat exchange quality; on the contrary, the heat exchange stroke is reduced, the heat exchange amount is reduced, and the heat exchange efficiency is ensured.

[0014] Furthermore, the transmission groove is located at the upper part of the tube wall of the stretching section.

[0015] By arranging the transmission groove upward, the elastic sheet is located at the upper part, so that the vertical component of the force generated by the wall attachment effect is directed upward, which facilitates the adjustment of the heat exchange stroke.

[0016] Furthermore, the thickness of the elastic sheet gradually decreases along the feeding direction.

[0017] By setting the thickness decreasing gradually, the response sensitivity is improved when the heat exchange stroke is extended.

[0018] Furthermore, the combustion device includes a burner, an air preheater and a burner. A plurality of burners are arranged along the side wall and the bottom of the radiation cavity. The air preheater is placed in the convection cavity. The burner and air preheater outlets are respectively connected to the burner pipe.

[0019] A burner is provided for supplying fuel, and an air preheater is placed in the convection chamber. The air is preheated by flue gas and sent into the burner for combustion along with the fuel. The combustion generates flue gas and the raw materials inside are cracked through the furnace tube.

[0020] As an optimization, the cracking furnace also includes a water supply pipe, which passes through the convection chamber, and the end of the water supply pipe is connected to the steam drum. By setting up the water supply pipe to supply water to the steam drum, it is convenient for the steam drum to generate steam. When the water supply pipe passes through the convection chamber, the water in the water supply pipe is heated by the flue gas, thereby improving the heat recovery efficiency.

[0021] As an optimization, the water supply pipe is a coil structure, a smoke pipe is provided at the upper end of the furnace body, the upper end of the convection cavity is connected to the smoke pipe, the water supply pipe is located below the smoke pipe, and the water supply pipe is located on the upper layer of the feed pipe. The water supply pipe is arranged through a coil to extend the heat exchange time in the convection cavity and improve the heat recovery efficiency. The water supply pipe is placed on the upper side of the feed pipe to prevent the flue gas from affecting the preheating of the raw materials in the feed pipe.

[0022] As an optimization, the water supply pipe is arranged in a spiral along the same plane, and the outlet of the water supply pipe is located at the bottom of the spiral plane. Through the spiral arrangement, the inlet is located on the outside, so that when the water body is preheated, the temperature increases as the spiral moves toward the middle. By placing the outlet downward, the flue gas in the convection chamber gradually decreases during the upward flow, so that the water outlet and the flue gas always maintain a large temperature difference, ensuring the preheating temperature of the water body.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the connecting pipe adopts a pipe with adjustable length. When the feed amount of the raw material changes, the length and inclination angle of the connecting pipe are controlled by the extension component, thereby adjusting the preheating time of the raw material, so that the temperature of the raw material entering the furnace tube remains stable, thereby ensuring the quality of cracking; since one end of the elastic sheet is fixed on the wall of the induction section tube and the other end is linked to the transmission sheet, the elastic sheet will deform as the transmission sheet moves, thereby adjusting the curvature. In the initial state, the curvature of the elastic sheet is the largest. When the raw material feed is the standard value, the windward plate is driven to move to the calibrated position, and the elastic sheet is deformed through the transmission sheet, so that the curvature reaches the standard value. When the airflow flows through the curved surface of the elastic sheet, it moves along the curved surface under the action of the wall attachment, and the jet rushes to the wall of the stretching section. The length from contact to separation of the elastic sheet is defined as the wall attachment length, thereby generating a lateral force on the stretching section. This lateral force has a vertical component, and the stretching section is stretched by this component until it reaches a stable length; when the raw material feed increases, the impact force on the windward plate increases, the elastic sheet is further deformed, and the curvature decreases, thereby extending the wall attachment length. As the wall attachment length is extended, the angle between the jet direction after separation and the horizontal direction increases, thereby increasing the vertical component, driving the stretching section to further stretch, extending the heat exchange stroke, and ensuring the heat exchange quality; on the contrary, the heat exchange stroke is reduced, the heat exchange amount is reduced, and the heat exchange efficiency is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the furnace structure of the present invention;

[0026] Figure 3 Schematic structural diagram of the extended component of the present invention;

[0027] Figure 4 is Figure 3 Enlarged view of partial A of the view;

[0028] Figure 5 is Figure 3 Enlarged view of partial B of the view;

[0029] Figure 6 Schematic structural diagram of the connecting pipe of the present invention;

[0030] Figure 7 Schematic structural diagram of the radiation cavity of the present invention.

[0031] In the figure: 1, bearing device; 11, furnace body; 111, convection cavity; 112, anastomosis cavity; 113, radiation cavity; 12, feed pipe; 13, steam pipe; 14, furnace tube; 2, control device; 21, connecting pipe; 211, induction section; 212, stretching section; 213, transmission groove; 22, extended component; 221, windward plate; 222, transmission piece; 223, elastic piece; 3, combustion device; 31, burner; 32, air preheater; 33, burner nozzle; 4, quench cooler; 5, steam drum; 6, feed water pipe; 7, smoke pipe. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment: As Figures 1-7 shown, the present invention provides a technical solution for a cracking furnace with a flow regulation function.

[0034] The cracking furnace includes a bearing device 1, a control device 2, a combustion device 3, a quench cooler 4, and a steam drum 5. The bearing device 1 is communicated with the quench cooler 4, the steam drum 5 is communicated with the bearing device 1 through a pipeline, the combustion device 3 is communicated with the bearing device 1 through a pipeline, the control device 2 is connected to the bearing device 1, the bearing device 1 includes a furnace body 11, the furnace body 11 includes a convection cavity 111 and a radiation cavity 113, an anastomosis cavity 112 is provided between the convection cavity 111 and the radiation cavity 113, the control device 2 is placed in the anastomosis cavity 112, and the control device 2 is used to adjust the raw material heat exchange travel in the anastomosis cavity 112.

[0035] The raw materials are pyrolyzed in a pyrolysis furnace. The furnace body 11 of the carrying device 1 is used to provide a pyrolysis space. The combustion device 3 is used to increase the temperature required for the pyrolysis reaction. The regulation device 2 is used to adjust the heat exchange stroke of the raw materials. According to the amount of raw material feeding, the heat exchange stroke is adjusted in real time to ensure the heat exchange temperature. That is, the more the raw material feeding amount, within the limited space of the anastomosis cavity 112, the heat exchange stroke is extended, thereby improving the heat exchange quality. The space inside the furnace body 11 is distributed in a three-section manner, namely, the convection cavity for preheating the raw materials, the radiation cavity 113 for carrying out the pyrolysis reaction, and the anastomosis cavity 112 that connects the two cavities and adjusts the heat exchange stroke. Through the chamber division setting, the flue gas used for pyrolysis can be sequentially connected in series and flow out after experiencing multiple heat exchanges, improving the utilization rate of heat and reducing energy consumption. The steam drum 5 is used to provide dilution steam and enters the convection cavity together with the raw materials. The gas after the pyrolysis reaction is oil-cooled by the quench cooler 4 to prevent secondary reaction of the pyrolysis gas and affect the pyrolysis quality.

[0036] Further, the carrying device 1 further includes a feed pipe 12, a steam pipe 13, and a furnace tube 14. One end of the feed pipe 12 is inserted into the convection cavity 111. The feed pipe 12 is communicated with the steam pipe 13. The furnace tube 14 is placed in the radiation cavity 113. The outlet of the steam drum 5 is connected to the steam pipe 13 through a pipeline.

[0037] The regulation device 2 includes a connecting pipe 21 and an extension component 22. The end of the feed pipe 12 is communicated with the connecting pipe 21. The connecting pipe 21 is placed in the anastomosis cavity 112. The end of the connecting pipe 21 is connected to the furnace tube 14 through a pipeline. The length of the connecting pipe 21 is adjustable. The extension component 22 is placed in the connecting pipe 21 and is used to adjust the heat exchange stroke of the connecting pipe 21.

[0038] The feed pipe 12 is used to supply raw materials. The steam pipe 13 is connected to the steam drum 5 to provide dilution steam into the feed pipe 12 and enter the convection cavity 111 together with the raw materials. It is preheated by the high-temperature flue gas in the convection cavity 111 and then enters the connecting pipe 21 after preheating. The connecting pipe 21 uses a pipe with adjustable length. When the feeding amount of the raw materials changes, the length and inclination angle of the connecting pipe 21 are controlled by the extension component 22, so as to adjust the preheating time of the raw materials, make the temperature of the raw materials entering the furnace tube 14 stable, and thus ensure the pyrolysis quality.

[0039] Furthermore, the connecting pipe 21 is provided with an induction section 211 and a stretching section 212 in sequence along the feeding direction. The induction section 211 is connected to the end of the feed pipe 12, and the end of the stretching section 212 is connected to the furnace pipe 14. A transmission groove 213 is provided on the connecting pipe 21, and the transmission groove 213 is located in the induction section 211. The extension component 22 includes a windward plate 221, a transmission sheet 222 and an elastic sheet 223. The transmission sheet 222 and the transmission groove 213 are slidably connected. The windward plate 221 and the transmission sheet 222 are tightly connected. The elastic sheet 223 is arranged in an arc shape. One end of the elastic sheet 223 is tightly connected to the tube wall of the induction section 211, and the other end is tightly connected to the end of the transmission sheet 222.

[0040] The connecting pipe 21 is set in sections, and the inlet of the induction section 211 is connected to the end of the feed pipe 12. When the preheated raw materials enter the connecting pipe 21, the temperature is finely adjusted according to the feed amount of the raw materials. When the raw materials impact the windward plate 221, the impact energy conversion drives the transmission sheet 222 to move laterally along the transmission groove 213. The other end of the transmission sheet 222 is connected to the elastic sheet 223. When the transmission sheet 222 moves, since one end of the elastic sheet 223 is fixed on the tube wall of the induction section 211 and the other end is linked to the transmission sheet 222, the elastic sheet 223 will deform as the transmission sheet 222 moves, thereby adjusting the curvature. In the initial state, the curvature of the elastic sheet 223 is the largest. When the raw material feed is at the standard value, the windward plate 221 is driven to move to the calibrated position, and the elastic sheet 223 is driven to deform through the transmission sheet 222, so that the curvature reaches the standard value. When the airflow flows through the curved surface of the elastic sheet 223, it moves along the curved surface under the action of the wall attachment, and the jet rushes toward the wall of the stretching section 212. The length from contact to separation of the elastic sheet 223 is defined as the wall attachment length, thereby generating a lateral force on the stretching section 212. This lateral force has a vertical direction. The component force drives the stretching section 212 to stretch until it reaches a stable length; when the raw material feed increases, the impact force on the windward plate 221 increases, the elastic sheet 223 is further deformed, and the curvature decreases, thereby extending the wall attachment length. As the wall attachment length increases, the angle between the jet direction after separation and the horizontal direction increases, thereby increasing the vertical component force, driving the stretching section 212 to stretch further, extending the heat exchange stroke, and ensuring the heat exchange quality; conversely, the heat exchange stroke is reduced, the heat exchange amount is reduced, and the heat exchange efficiency is guaranteed.

[0041] Furthermore, the transmission groove 213 is located on the upper part of the tube wall of the stretching section 212 .

[0042] By placing the transmission groove 213 upward, the elastic sheet 223 is located at the upper part, so that the vertical component of the force generated by the wall effect is directed upward, which facilitates the adjustment of the heat exchange stroke.

[0043] Furthermore, the thickness of the elastic sheet 223 gradually decreases along the feeding direction.

[0044] Through the decreasing thickness setting, the response sensitivity is improved when the heat exchange stroke is extended.

[0045] Furthermore, the combustion device 3 includes a burner 31, an air preheater 32 and a burner nozzle 33. A number of burner nozzles 33 are arranged along the side wall and bottom of the radiation chamber 113. The air preheater 32 is placed in the convection chamber 111. The outlets of the burner 31 and the air preheater 32 are respectively connected to the burner nozzles 33 through pipelines.

[0046] By setting the burner 31 to supply fuel, the air preheater 32 is placed in the convection chamber 111. The air is preheated by the flue gas and then sent into the burner nozzle 33 along with the fuel for combustion. The combustion generates flue gas, and the raw materials inside are pyrolyzed through the furnace tubes 14.

[0047] As an optimization, the pyrolysis furnace further includes a water supply pipe 6. The water supply pipe 6 passes through the convection chamber 111, and the end of the water supply pipe 6 is connected to the steam drum 5. By setting the water supply pipe 6 to supply water to the steam drum 5, it is convenient for the steam drum 5 to generate steam. When the water supply pipe 6 passes through the convection chamber 111, the water in the water supply pipe 6 is heated by the flue gas, improving the heat recovery efficiency.

[0048] As an optimization, the water supply pipe 6 is of a coil structure. A flue pipe 7 is provided at the upper end of the furnace body 11. The upper end of the convection chamber 111 is connected to the flue pipe 7 through a pipeline. The water supply pipe 6 is located below the flue pipe 7 and above the feed pipe 12. The water supply pipe 6 is arranged in a coil to extend the heat exchange time in the convection chamber 111 and improve the heat recovery efficiency. The water supply pipe 6 is placed above the feed pipe 12 to prevent affecting the preheating of the raw materials in the feed pipe 12 by the flue gas.

[0049] As an optimization, the water supply pipe 6 is spirally arranged along the same plane, and the outlet of the water supply pipe 6 is located at the lower part of the spiral plane. Through the spiral arrangement, the inlet is located on the outside. When the water body is preheated, the closer it gets to the middle of the spiral, the higher the temperature. Through the lower placement of the outlet, the flue gas in the convection chamber 111 gradually decreases during the upward flow process, so that there is always a large temperature difference between the water body outlet and the flue gas, ensuring the preheating temperature of the water body.

[0050] Working principle of the present invention: The connecting pipe 21 adopts a pipe with adjustable length. When the feeding amount of raw materials changes, the length and inclination angle of the connecting pipe 21 are controlled by the extension component 22, so as to adjust the preheating time of the raw materials, keep the temperature of the raw materials entering the furnace tube 14 stable, and ensure the quality of cracking; Since one end of the elastic sheet 223 is fixed on the wall of the induction section 211 and the other end is linked with the transmission sheet 222, the elastic sheet 223 will deform as the transmission sheet 222 moves, thereby adjusting the curvature. In the initial state, the curvature of the elastic sheet 223 is the largest. When the raw material feeding is at the standard value, the windward plate 221 is driven to move to the calibrated position, and the elastic sheet 223 is driven to deform by the transmission sheet 222, so that the curvature reaches the standard value. When the air flow passes through the curved surface of the elastic sheet 223, under the wall attachment effect, it moves along the curved surface and jets towards the wall of the stretching section 212. The length from contacting to detaching from the elastic sheet 223 is defined as the wall attachment length, thereby generating a side deviation force on the stretching section 212. This side deviation force has a vertical component force, which drives the stretching section 212 to stretch until it reaches the stable length; When the raw material feeding increases, the acting force on the windward plate 221 increases, the elastic sheet 223 deforms further, the curvature decreases, and the wall attachment length is extended. As the wall attachment length extends, the angle between the jet direction after detachment and the horizontal direction increases, thereby increasing the vertical component force and driving the stretching section 212 to stretch further, extending the heat exchange stroke and ensuring the heat exchange quality; On the contrary, the heat exchange stroke is reduced, the heat exchange amount is reduced, and the heat exchange efficiency is ensured.

[0051] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A cracking furnace with flow control function, characterized in that: The cracking furnace comprises a carrying device, a regulating device, a combustion device, a quench cooler and a steam drum, wherein the carrying device is connected to the quench cooler, the steam drum is connected to the carrying device through a pipeline, the combustion device is connected to the carrying device through a pipeline, the regulating device is connected to the carrying device, the carrying device comprises a furnace body, the furnace body comprises a convection cavity and a radiation cavity, an anastomotic cavity is provided between the convection cavity and the radiation cavity, the regulating device is placed in the anastomotic cavity, and the regulating device is used to adjust the heat exchange stroke of the raw materials in the anastomotic cavity; The carrying device comprises a feed pipe; The regulating device comprises a connecting pipe and an extension component, the end of the feed pipe is connected to the connecting pipe, the connecting pipe is placed in the anastomotic cavity, the end of the connecting pipe is connected to the furnace pipe, the length of the connecting pipe is adjustable, the extension component is placed in the connecting pipe, and the extension component is used to adjust the heat exchange stroke of the connecting pipe; The connecting pipe is provided with an induction section and a stretching section in sequence along the feeding direction, the induction section is connected with the end pipe of the feed pipe, the end of the stretching section is connected with the furnace pipe pipe, the connecting pipe is provided with a transmission groove, the transmission groove is located in the induction section, the extension component includes a windward plate, a transmission sheet and an elastic sheet, the transmission sheet and the transmission groove are slidably connected, the windward plate and the transmission sheet are tightly connected, the elastic sheet is arranged in an arc shape, one end of the elastic sheet is tightly connected to the wall of the induction section pipe, and the other end is tightly connected to the end of the transmission sheet.

2. The cracking furnace with flow control function according to claim 1, characterized in that: The supporting device also includes a steam pipe and a furnace pipe. One end of the feed pipe is inserted into the convection cavity. The feed pipe is connected to the steam pipe. The furnace pipe is placed in the radiation cavity. The steam drum outlet is connected to the steam pipe pipeline.

3. The cracking furnace with flow control function according to claim 2, characterized in that: The transmission groove is located at the upper part of the tube wall of the stretching section.

4. The cracking furnace with flow control function according to claim 2, characterized in that: The thickness of the elastic sheet gradually decreases along the feeding direction.

5. The cracking furnace with flow control function according to claim 1, characterized in that: The combustion device comprises a burner, an air preheater and a burner nozzle. A plurality of burners are arranged along the side wall and the bottom of the radiation cavity. The air preheater is placed in the convection cavity. The burner and air preheater outlets are respectively connected to the burner nozzle pipeline.

6. The cracking furnace with flow control function according to claim 5, characterized in that: The cracking furnace also includes a water supply pipe, which passes through the convection chamber, and the end of the water supply pipe is connected to the steam drum.

7. The cracking furnace with flow control function according to claim 6, characterized in that: The water supply pipe is a coil structure, a smoke pipe is arranged at the upper end of the furnace body, the upper end of the convection cavity is connected with the smoke pipe, the water supply pipe is located below the smoke pipe, and the water supply pipe is located on the upper layer of the feed pipe.

8. The cracking furnace with flow control function according to claim 7, characterized in that: The water supply pipes are arranged in a spiral along the same plane, and the outlets of the water supply pipes are located at the lower part of the spiral plane.

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