Cracking system and cracking method

Abstract

This invention relates to the field of pyrolysis, and discloses a pyrolysis system and method. The pyrolysis system of this invention includes a convection section and a radiation section, each independently comprising an inlet and an outlet. The outlet of the convection section and the inlet of the radiation section are connected by a connecting pipe. The convection section is used to heat the pyrolysis feedstock to a cross-temperature range to obtain heated pyrolysis feedstock, and the heating device for the convection section is a shock wave heater. This system reduces CO2 emissions, efficiently utilizes energy, precisely controls the cross-temperature range, and enables industrial application. Furthermore, by dividing the traditional pyrolysis furnace into two independent modules—the convection section and the radiation section—it helps avoid the problems of uneven flue gas distribution and reduced thermal efficiency in the convection section that occur in large-scale pyrolysis furnaces. In addition, the convection section of this invention uses internal heating via a shock wave reactor, resulting in high heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of pyrolysis, and more specifically to a pyrolysis system and pyrolysis method. Background Technology

[0002] In the production of basic chemicals, steam cracking units play a crucial role, consuming significant amounts of energy to decompose petroleum hydrocarbons into olefins and aromatics. Typically, the cracking reactions occur in the radiant section of the cracking furnace tubes, requiring a furnace temperature of 850°C. Simultaneously, a continuous supply of sufficient energy is needed during furnace operation to ensure the desired conversion rate. Currently, the industry primarily provides the energy for the cracking reaction by burning fossil fuels in burners located within the cracking furnace. The convection section of the cracking furnace mainly recovers waste heat from the flue gas to preheat and vaporize the feedstock oil, while simultaneously superheating the feedstock oil and dilution steam to the material's cross temperature. The remaining heat is used to preheat ultra-high pressure steam and boiler feedwater. The radiant section of the cracking furnace is the main reaction zone, where the cracking reaction primarily occurs in the radiant section's furnace tubes. As a major energy consumer in ethylene plants, cracking furnaces account for about 60% of the total energy consumption of the entire ethylene process industry. However, relying on fossil fuel combustion to heat cracking furnaces generates a large amount of CO2, making cracking furnaces one of the largest sources of carbon dioxide emissions in the entire petrochemical value chain. This contradicts the current development goal of achieving carbon peak and carbon neutrality. Therefore, greening cracking furnaces has always been a research focus in the cracking field.

[0003] Current improvements to pyrolysis furnaces mainly focus on the structure and arrangement of the burners, and the furnace body insulation layer, with the primary aim of reducing NO₂ in the pyrolysis furnace. X While efforts have been made to reduce emissions and heat loss and improve the thermal efficiency of the pyrolysis furnace, the problem of excessive CO2 emissions from the pyrolysis furnace has not been solved. In addition, with the increase in the pyrolysis capacity of a single pyrolysis furnace and the emergence of dual-radiation section pyrolysis furnaces, the length of the furnace and the number of feed groups have increased significantly. The conventional convection section structure with the same length as the radiation section will cause uneven distribution of flue gas in the convection section due to the convection section being too wide or too long, resulting in reduced heat transfer efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of excessive CO2 emissions, low thermal conversion efficiency, high energy consumption, and easy coking in the convection section of existing pyrolysis systems, and to provide a pyrolysis system and method. This system reduces CO2 emissions, efficiently utilizes energy, precisely controls temperature across the pyrolysis zone, and enables industrial applications. Furthermore, it divides the traditional pyrolysis furnace into two independent modules—a convection section and a radiation section—which helps avoid the problems of uneven flue gas distribution and reduced thermal efficiency in the convection section that occur in large-scale pyrolysis furnaces.

[0005] To achieve the above objectives, the first aspect of the present invention provides a pyrolysis system, the system comprising a convection section and a radiation section, the convection section and the radiation section each independently comprising an inlet and an outlet, the outlet of the convection section and the inlet of the radiation section being connected by a connecting pipe.

[0006] The convection section is used to heat the pyrolysis feedstock to a temperature spanning the range to obtain a heated pyrolysis feedstock, and the heating device of the convection section is a shock wave heater.

[0007] A second aspect of the present invention provides a pyrolysis method, the method comprising introducing pyrolysis feedstock into a system as described above for a pyrolysis reaction.

[0008] The beneficial effects obtained by the present invention through the above technical solution are as follows:

[0009] 1. The system of the present invention uses a shock wave heater as the heating device for the convection section. It provides a heat source for preheating the pyrolysis raw materials by heating the circulating gas. It utilizes the shock wave loss phenomenon to convert the kinetic energy of the circulating gas into thermal energy, which is an endogenous heat supply method, and greatly improves the thermal conversion efficiency.

[0010] 2. In the system of the present invention, the heat source of the convection section is obtained by heating the circulating gas with a shock wave heater, and the heat source of the radiation section is provided by a resistance wire. That is, the required energy is provided by green electricity, which significantly reduces the CO2 emissions of the pyrolysis system compared with traditional pyrolysis furnaces.

[0011] 3. This invention uses two independent modules to preheat the pyrolysis feedstock (i.e., heat the pyrolysis feedstock to a temperature range) and carry out the pyrolysis reaction separately, avoiding the problems of uneven flue gas distribution and reduced thermal efficiency caused by excessively wide or long convection sections in large-scale pyrolysis furnaces. Attached Figure Description

[0012] Figure 1 These are schematic diagrams of the pyrolysis system in some embodiments of the present invention;

[0013] Figure 2 This is a schematic diagram of the shock heater structure in some embodiments of the present invention.

[0014] Explanation of reference numerals in the attached figures

[0015] 1-Shock heater, 2-Convection section, 3-Radiation section, 4-Heat exchange coil, 5-Radiation section inlet, 6-Radiation section outlet, 7-Vertical partition plate, 8-Spiral heating resistance wire, 9-Insulation material, 10-Circulating gas recovery device, 11-Circulating gas inlet, 12-Convection section inlet, 13-Convection section outlet, 14-Pyrolysis products, 15-Circulating gas outlet, 16-Pyrolysis furnace tube, 17-Circulating gas inlet to be heated, 18-Rotating blades, 19-Bladeless flow space, 20-Circulating gas storage tank, 21-Shock heater outlet, 22-Shock heater shell. Detailed Implementation

[0016] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0017] The first aspect of the present invention provides a pyrolysis system, the system comprising a convection section and a radiation section, the convection section and the radiation section each independently comprising an inlet and an outlet, the outlet of the convection section and the inlet of the radiation section being connected by a connecting pipe;

[0018] The convection section is used to heat the pyrolysis feedstock to a temperature spanning the range to obtain a heated pyrolysis feedstock, and the heating device of the convection section is a shock wave heater.

[0019] In this invention, the convection section and the radiation section are two independent units, which are connected by a connecting pipe.

[0020] In some embodiments of the present invention, the convection section further includes a recirculating gas inlet and a recirculating gas outlet.

[0021] In some embodiments of the present invention, the convection section further includes a heat exchange coil. The two ends of the heat exchange coil are respectively connected to the inlet and outlet of the convection section, and the pyrolysis feedstock enters the heat exchange coil through the inlet of the convection section and is heated to the specified temperature.

[0022] In this invention, the shock heater is used to heat the circulating gas and then introduce the heated circulating gas into the convection section to exchange heat with the pyrolysis feedstock, thereby heating the pyrolysis feedstock to a temperature across the specified range. In some embodiments of this invention, the shock heater includes an outlet and a circulating gas inlet, and the outlet of the shock heater is connected to the circulating gas inlet of the convection section. The shock heater is used to introduce the heated circulating gas into the convection section, where the heated circulating gas exchanges heat with the pyrolysis feedstock in the heat exchange coil, thereby heating the pyrolysis feedstock to a temperature across the specified range.

[0023] In this invention, the circulating gas can be any circulating gas conventionally used in the art. Preferably, the circulating gas is at least one of air, nitrogen, or carbon dioxide.

[0024] In this invention, the shock wave heater is not particularly limited, as long as it can heat the circulating gas. The inventors discovered that when the number of rotating blades in the shock wave heater is 4-8, the required heat for heating the pyrolysis feedstock is met. Therefore, preferably, the shock wave heater is equipped with rotating blades, and the number of rotating blades is 4-8.

[0025] In some embodiments of the present invention, in order to reduce carbon emissions generated during the heating process, the electrical energy of the shock wave heater is derived from green electricity.

[0026] In some embodiments of the present invention, the system further includes a circulating gas storage tank connected to a shock heater for providing circulating gas to be heated. The circulating gas to be heated in the circulating gas storage tank enters the shock heater through the circulating gas inlet for heating.

[0027] In some embodiments of the present invention, the system further includes a circulating gas recovery device for recovering the circulating gas obtained after heat exchange with the pyrolysis feedstock in the convection section. Preferably, the recovered circulating gas enters a circulating gas storage tank.

[0028] In this invention, the radiant section is used to carry out the pyrolysis reaction of the pyrolysis feedstock heated to the pyrolysis temperature. In some embodiments of this invention, a pyrolysis furnace tube is provided inside the radiant section, and the two ends of the pyrolysis furnace tube are respectively connected to the feed inlet and the discharge outlet of the radiant section.

[0029] In some embodiments of the present invention, the heat source required for the radiant section is provided by the heating resistance wire. Preferably, the heating resistance wire is a spiral heating resistance wire. Preferably, the electrical energy required for the resistance wire comes from green electricity.

[0030] In some embodiments of the present invention, the radiant section is provided with thermal insulation material. Preferably, to improve the thermal insulation performance of the radiant section, an outer layer of thermal insulation material and an inner layer of thermal insulation material are provided inside the radiant section. It should be understood that the outer layer of thermal insulation material refers to the thermal insulation material near the surface of the radiant section furnace body, and the inner layer of thermal insulation material refers to the thermal insulation material near the interior of the radiant section furnace body.

[0031] In this invention, the insulation material can be any conventional insulation material used in the art. Preferably, the insulation material is ceramic fiber. Compared with traditional insulation materials, ceramic fiber has better high-temperature resistance, lower thermal conductivity, lighter weight, and better thermal stability. Furthermore, ceramic fiber is white in color and has excellent heat reflection capabilities. Preferably, the outer insulation material is one of aluminosilicate ceramic fiber, calcium silicate ceramic fiber board, slag wool, and high-alumina needle-punched felt. Preferably, the inner insulation material is at least one of polycrystalline mullite ceramic fiber, alumina ceramic fiber, and aluminosilicate ceramic fiber.

[0032] In some embodiments of the present invention, the external insulation material is arranged in the form of an anvil inside the radiant section furnace body.

[0033] In some embodiments of the present invention, an aluminum foil layer is disposed between the inner and outer insulation materials. The addition of the aluminum foil does not significantly increase cost, but it can reduce radiative heat transfer. The main principle of its insulation is that the transparent aluminum foil has a mirror effect, which can be used to reduce radiative heat transfer and further improve the insulation performance of the radiative section. In addition, the added aluminum foil layer can also act as a gas barrier and corrosion protectant.

[0034] In some embodiments of the present invention, the internal insulation material is disposed inside the radiant section in the form of furnace tiles. Preferably, the furnace tiles are multiple pieces, and the arrangement of the furnace tiles can be one or more rows of furnace tiles along the horizontal direction of the radiant section, and one or more furnace tiles along the vertical direction. By disposing of multiple furnace tiles inside the radiant section, it is advantageous to conveniently and flexibly control and adjust the temperature within the radiant section as needed. There is no particular limitation on the number of furnace tiles; those skilled in the art can select according to actual conditions.

[0035] In some embodiments of the present invention, the internal insulation material, in addition to its function of heat preservation, can also be used as a furnace tile for fixing heating resistance wires. The internal insulation material contains spiral heating resistance wires, and each heating resistance wire forms an independent current loop. Preferably, the furnace tile serving as the internal insulation material has several rows of horizontal grooves, in which heating resistance wires are disposed. Both ends of the heating resistance wire on each furnace tile are connected to a power bus located outside the radiant section of the furnace body, forming an independent current loop.

[0036] In some preferred embodiments of the present invention, the internal insulation material is arranged in the form of furnace tiles inside the radiant section. The furnace tiles are arranged as follows: one or more rows of furnace tiles are arranged along the horizontal direction of the radiant section, and one or more furnace tiles are arranged along the vertical direction. Several rows of horizontal grooves are arranged on each furnace tile, and spiral heating resistance wires are arranged in the grooves. Both ends of the resistance wires on each furnace tile are connected to the power bus located outside the furnace body of the radiant section to form an independent current loop.

[0037] In some embodiments of the present invention, the radiating section is provided with one or more vertical partitions in the vertical direction to divide the radiating section into multiple intervals. The material of the vertical partitions is consistent with the internal insulation material. By using vertical partitions to divide the radiating section into one or more intervals, the heat supply of each interval can be adjusted according to actual production needs, thereby improving the energy utilization rate of the radiating section. The number of vertical partitions and the distance between the vertical partitions can be selected according to actual conditions, and will not be elaborated here.

[0038] In some embodiments of the present invention, a twisted-plate heat transfer enhancement element is installed inside the pyrolysis furnace tube. The two ends of the pyrolysis furnace tube are respectively connected to the inlet and outlet of the radiant section. The heated pyrolysis feedstock enters the pyrolysis furnace tube through the inlet of the radiant section, and the pyrolysis product flows out through the outlet of the radiant section. The heated pyrolysis feedstock undergoes a pyrolysis reaction within the pyrolysis furnace tube. Because the radiant section in the system provided by the present invention uses electric heating, the furnace body of the radiant section can be a square or rectangular box. Its vertical height is mainly limited by the height of the furnace tube. Compared with traditional pyrolysis furnaces, the height of the radiant section furnace body can be greatly reduced, making operation more convenient.

[0039] The pyrolysis furnace tubes are arranged horizontally along the radiant section of the furnace body. Depending on production needs, the pyrolysis furnace tubes can be arranged in one row or multiple rows. The pyrolysis furnace tubes can be arranged in series or in parallel. The radiant section furnace body is divided into one or several different areas by vertical partitions. Near the outlet of the radiant section, in order to reduce the occurrence of side reactions, the heat supply of the pyrolysis furnace tubes can be appropriately reduced to improve the yield of the target product.

[0040] As the type of pyrolysis feedstock changes, the pyrolysis reaction temperature and heat required also change. The system provided by this invention divides the radiant furnace body into one or more different zones using vertical partitions. By adjusting the heat supply of the heating resistance wires in different zones, simultaneous pyrolysis of different feedstocks can be conveniently and flexibly achieved. A second aspect of this invention provides a pyrolysis method, which includes introducing the pyrolysis feedstock into the system described above for a pyrolysis reaction.

[0041] In some embodiments of the present invention, the method includes the following steps:

[0042] (1) The pyrolysis feedstock is heated to the cross temperature by exchanging heat with the heated circulating gas in the convection section, so as to obtain the circulating gas and the heated pyrolysis feedstock after heat exchange with the pyrolysis feedstock.

[0043] (2) The heated pyrolysis raw material is introduced into the radiation section for pyrolysis reaction;

[0044] The heated circulating gas is obtained by heating the circulating gas with a shock wave heater.

[0045] In some embodiments of the present invention, the spanning temperature is 550-700°C. Here, the "spanning temperature" refers to the temperature of the radiant section inlet.

[0046] In some embodiments of the present invention, the inlet circulating gas velocity of the shock wave heater is 200-300 m / s.

[0047] In some embodiments of the present invention, the outlet circulating gas temperature of the shock wave heater is 800-1200°C.

[0048] In some embodiments of the present invention, the rotational speed of the rotating blades in the shock heater is 3000-4000 rpm.

[0049] In some embodiments of the present invention, the mass flow rate ratio of the circulating gas to the pyrolysis feedstock is 0.5-0.6.

[0050] In some embodiments of the present invention, the radiant section is used to induce a pyrolysis reaction in the pyrolysis feedstock heated to the pyrolysis temperature. The "pyrolysis temperature" refers to the temperature at the outlet of the radiant section.

[0051] In some embodiments of the present invention, the pyrolysis temperature is 750-850°C.

[0052] In some embodiments of the present invention, the pyrolysis feedstock is at least one of ethane, light hydrocarbons, naphtha, and hydrotreated tail oil.

[0053] In some embodiments of the present invention, the method further includes: introducing the circulating gas after heat exchange with the pyrolysis feedstock into a circulating gas recovery device for recovery, thereby obtaining recovered circulating gas. Preferably, the recovery further includes cooling the circulating gas after heat exchange with the pyrolysis feedstock in the convection section. More preferably, the method further includes: heating the recovered circulating gas to obtain heated circulating gas.

[0054] The present invention will be described in detail below through embodiments.

[0055] Example 1 in such Figure 1 The pyrolysis is carried out in the system shown, wherein the side view structure of the shock heater is as follows. Figure 2 As shown.

[0056] Figure 1 and Figure 2 In the diagram, 1 is the shock wave heater, 2 is the convection section, 3 is the radiation section, 4 is the heat exchange coil, 5 is the radiation section inlet, 6 is the radiation section outlet, 7 is the vertical partition plate, 8 is the spiral heating resistance wire, 9 is the insulation material, 10 is the circulating gas recovery device, 11 is the circulating gas inlet, 12 is the convection section inlet, 13 is the convection section outlet, 14 is the pyrolysis product, 15 is the circulating gas outlet, 16 is the pyrolysis furnace tube, 17 is the circulating gas inlet to be heated, 18 is the rotating blade, 19 is the bladeless flow space, 20 is the circulating gas storage tank, 21 is the outlet of the shock wave heater, and 22 is the shock wave reactor shell.

[0057] like Figure 1 and Figure 2 As shown, the pyrolysis system includes a shock heater 1, a convection section 2, a radiation section 3, a circulating gas recovery device 10, and a circulating gas storage tank 20. The convection section further includes a heat exchange coil 4, a circulating gas inlet 11, a convection section feed inlet 12, a convection section discharge outlet 13, and a circulating gas outlet 15. The two ends of the heat exchange coil are respectively connected to the feed inlet 12 and discharge outlet 13 of the convection section 2. The discharge outlet 13 of the convection section is connected to the feed inlet 5 of the radiation section 3 via a connecting pipe. The circulating gas inlet 11 of the convection section is connected to the outlet 21 of the shock wave heater, and the circulating gas outlet 15 is connected to the circulating gas recovery device 10. The radiation section 3 includes a radiation section feed inlet 5, a radiation section discharge outlet 6, a vertical partition plate 7, a spiral heating resistance wire 8, insulation material 9, and a pyrolysis furnace tube 16. The two ends of the pyrolysis furnace tube 16 of the radiation section are respectively connected to the feed inlet 5 and discharge outlet 6 of the pyrolysis radiation section. The insulation material 9 includes an inner layer insulation material (alumina ceramic fiber) and an outer layer insulation material (alumina ceramic fiber), wherein the outer layer insulation material is an anvil-shaped... The structure is designed in the form of a plate, with the inner insulation material arranged in the form of furnace tiles. Multiple rows of furnace tiles are arranged along the horizontal direction of the radiant section, and several rows of horizontal grooves are provided on the furnace tiles. Spiral heating resistance wires 8 are arranged in the grooves. Both ends of the spiral heating resistance wires on each furnace tile are connected to the power bus located outside the furnace body of the radiant section. The radiant section is provided with two vertical partition plates 7 in the vertical direction. The material of the vertical partition plates is alumina ceramic fiber. The shock wave heater 1 includes a circulating gas inlet 17 to be heated, rotating blades 18, a bladeless flow space 19, a shock wave heater outlet 21, and a shock wave heater shell 22. The circulating gas inlet 17 to be heated is connected to a circulating gas storage tank 20. The rotating blades 18 are located on the inner surface of the defined pipe formed by the inner and outer surfaces of the shock wave heater shell 22. The bladeless flow space is located on the outer surface of the defined pipe formed by the inner and outer surfaces of the shock wave heater shell 22.

[0058] Example 1

[0059] The shockwave heater has five rotating blades 18, rotating at 3500 rpm. The heating medium (i.e., circulating gas) is air. The circulating gas storage tank contains air, which enters the shockwave heater 1 through the circulating gas inlet 17 to be heated, resulting in heated circulating gas. The heated circulating gas enters the convection section 1 through the circulating gas inlet 11 at the outlet 21 of the shockwave heater. The air velocity at the circulating gas inlet is 300 m / s, the air flow rate is 6800 kg / h, the air temperature at the circulating gas inlet is 25℃, and the air temperature at the outlet of the shockwave heater is 900℃.

[0060] The pyrolysis feedstock enters the heat exchange coil 4 of the convection section through the feed inlet 12 at a rate of 5000 kg / h. In the heat exchange coil 4, the feedstock exchanges heat with the heated circulating gas entering the convection section 1 through the circulating gas inlet 11 (the mass flow ratio of the heated circulating gas to the feedstock is 0.6), thereby heating it to the cross temperature (700°C). This results in a heat-exchanged circulating gas and heated pyrolysis feedstock. The heated pyrolysis feedstock is discharged from the convection section outlet 13, passes through the connecting pipe 22, and enters the pyrolysis furnace tube 16 of the radiation section 3 through the feed inlet 5. It is heated to the pyrolysis temperature (840°C) by the spiral resistance wire 8, undergoing a pyrolysis reaction. The pyrolysis products are discharged through the radiation section outlet 6. After heat exchange, the circulating gas is discharged through the circulating gas outlet 15 and enters the circulating gas recovery device 10 for heat exchange and cooling to obtain the recovered circulating gas. The recovered circulating gas then enters the circulating gas storage tank and re-enters the shock wave heater 1 through the circulating gas inlet 17 for heating.

[0061] The CO2 emissions from this pyrolysis system are negligible.

[0062] Comparative Example 1

[0063] The cracking furnace described in Example 1 of patent CN109724446 uses ethane as the cracking feedstock at a rate of 5000 kg / h. The feedstock is preheated to 700°C in the convection section before entering the feed tube of the cracking furnace to undergo the cracking reaction. The cracking products are discharged through the discharge pipe. The CO2 emissions of this cracking system are approximately 16,000 tons.

[0064] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A cleaving system, characterized by, The system includes a convection section and a radiation section, each of which independently includes an inlet and an outlet. The outlet of the convection section and the inlet of the radiation section are connected by a connecting pipe. The convection section is used to heat the pyrolysis feedstock to a cross-temperature range to obtain heated pyrolysis feedstock, and the heating device of the convection section is a shock wave heater; The spanning temperature is 550-700℃; The shock wave heater is equipped with rotating blades, and the number of rotating blades is 4-8. The radiation section is used to carry out the pyrolysis reaction of the pyrolysis feedstock heated to the pyrolysis temperature; The convection section and the radiation section are two independent units, which are connected by connecting pipes; The convection section also includes a circulating gas inlet and a circulating gas outlet; the convection section also includes a heat exchange coil, and the pyrolysis feedstock enters the heat exchange coil from the feed inlet of the convection section and is heated to the cross temperature. The shock wave heater includes an outlet and a circulating gas inlet to be heated. The outlet of the shock wave heater is connected to the circulating gas inlet of the convection section, and is used to heat the circulating gas and introduce it into the convection section to exchange heat with the pyrolysis feedstock so that the pyrolysis feedstock is heated to the cross temperature. The heat source required for the radiant section is provided by a heating resistance wire, and the electrical energy required for the heating resistance wire comes from green electricity.

2. The system of claim 1, wherein, The circulating gas is one of air, nitrogen, or carbon dioxide.

3. The system of claim 1, wherein, The shock wave heater is powered by green electricity.

4. The system of claim 1, wherein, The system also includes a circulating gas recovery device, which is used to recover the circulating gas that has exchanged heat with the pyrolysis feedstock in the convection section.

5. The system of claim 1, wherein, The radiant section is equipped with thermal insulation material.

6. The system of claim 1, wherein, The heating resistance wire is a spiral heating resistance wire.

7. The system of claim 5, wherein, The insulation material includes internal insulation material and external insulation material. The internal insulation material is provided with spiral heating resistance wires, and each heating resistance wire forms an independent current circuit.

8. The system of claim 1, wherein, The radiating section is also provided with one or more vertical partitions to divide the radiating section into multiple intervals.

9. A cleavage method characterized by, The method includes introducing pyrolysis feedstock into the system of any one of claims 1-8 to carry out a pyrolysis reaction.

10. The method of claim 9, wherein, The method includes the following steps: (1) The pyrolysis feedstock is heated to the cross temperature by exchanging heat with the heated circulating gas in the convection section, so as to obtain the circulating gas and the heated pyrolysis feedstock after heat exchange with the pyrolysis feedstock. (2) The heated pyrolysis raw material is introduced into the radiation section for pyrolysis reaction; The heated circulating gas is obtained by heating the circulating gas with a shock wave heater.

11. The method according to claim 10, wherein, The rotating blades inside the shock wave heater rotate at a speed of 3000-4000 rpm; And / or, the inlet circulating gas velocity of the shock wave heater is 200-300 m / s; And / or, the temperature of the circulating gas at the outlet of the shock wave heater is 800-1200℃; And / or, the pyrolysis temperature is 750-850°C; And / or, the ratio of the circulating gas to the mass flow rate of the pyrolysis feedstock is 0.5-0.

6.

12. The method of claim 11, wherein, The pyrolysis feedstock is at least one of light hydrocarbons, naphtha, and hydrotreated tail oil.

13. The method according to any one of claims 10-12, wherein, The method further includes: introducing the circulating gas after heat exchange with the pyrolysis feedstock into a circulating gas recovery device for recovery, thereby obtaining the recovered circulating gas.

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