Waste tire pyrolysis system

Abstract

The waste tire pyrolysis system comprises a first pyrolysis device, a second pyrolysis device and a third pyrolysis device, the first pyrolysis device is used for preheating waste tire particles, and the temperature of the preheated waste tire particles discharged by the first pyrolysis device is a first preset value; an inlet of the second pyrolysis device communicates with an outlet of the first pyrolysis device, the second pyrolysis device is used for pyrolyzing the waste tire particles, the second pyrolysis device is an electric heating device, the temperature of a pyrolysis product discharged by the second pyrolysis device is a second preset value, and the second preset value is larger than the first preset value; an inlet of the third pyrolysis device is communicated with an outlet of the second pyrolysis device, the temperature of a pyrolysis product discharged by the third pyrolysis device after the secondary reaction is a third preset value, the third preset value is greater than the second preset value, and at least one of the first pyrolysis device and the third pyrolysis device can utilize the flue gas as a heat source. Therefore, according to the waste tire pyrolysis system, the pyrolysis temperature can be accurately controlled, and the pyrolysis effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of resource recovery and utilization of waste tires, and particularly relates to a waste tire pyrolysis system. Background Art

[0002] The waste tire pyrolysis technology can dispose of waste tires on a large scale, harmlessly and resourcefully. While solving the environmental pollution problems brought about by the rapid growth of the number of waste tires, it can also obtain considerable economic benefits, meeting the requirements of establishing a waste recycling system. However, in related technologies, the waste tire pyrolysis process has high energy consumption and cannot precisely control the pyrolysis process, resulting in low-quality pyrolysis products and poor economy of waste tires, seriously affecting the large-scale popularization and application of the waste tire pyrolysis technology. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in related technologies to some extent. To this end, an embodiment of the present invention provides a waste tire pyrolysis system.

[0004] The waste tire pyrolysis system according to the embodiment of the present invention includes:

[0005] A first pyrolysis device for preheating waste tire particles, and the temperature of the preheated waste tire particles discharged by the first pyrolysis device is a first preset value;

[0006] A second pyrolysis device, the inlet of which is communicated with the outlet of the first pyrolysis device, for pyrolyzing waste tire particles. The second pyrolysis device is an electric heating device, and the temperature of the pyrolysis products discharged by the second pyrolysis device is a second preset value, and the second preset value is greater than the first preset value;

[0007] A third pyrolysis device, the inlet of which is communicated with the outlet of the second pyrolysis device. The pyrolysis products generated by the second pyrolysis device can be introduced into the third pyrolysis device for a secondary reaction. The temperature of the pyrolysis products after the secondary reaction discharged by the third pyrolysis device is a third preset value, and the third preset value is greater than the second preset value. At least one of the first pyrolysis device and the third pyrolysis device can use flue gas as a heat source.

[0008] Therefore, the waste tire pyrolysis system according to the embodiment of the present invention can precisely control the pyrolysis temperature and improve the pyrolysis effect.

[0009] In some embodiments, both the first pyrolysis device and the third pyrolysis device can use flue gas as a heat source, and the second pyrolysis device is connected to a power supply device.

[0010] The pyrolysis system for waste tires according to an embodiment of the present invention further includes a hot blast stove, which can use the pyrolysis gas in the pyrolysis products as fuel. The flue gas outlet of the hot blast stove is communicated with the flue gas inlet of the first pyrolysis device through a first pipeline, and a first regulating valve is provided on the first pipeline. The first regulating valve is used to adjust the flue gas flow rate in the first pipeline. The flue gas outlet of the hot blast stove is communicated with the flue gas inlet of the third pyrolysis device through a second pipeline, and a second regulating valve is provided on the second pipeline. The second regulating valve is used to adjust the flue gas flow rate in the second pipeline.

[0011] In some embodiments, the third pyrolysis device has a pyrolysis gas outlet and a pyrolysis solid outlet. The pyrolysis gas outlet is used to discharge pyrolysis gas products, and the pyrolysis solid outlet is used to discharge pyrolysis solid products. The pyrolysis gas outlet is communicated with the inlet of a condensation device, and the condensation device is used to condense the pyrolysis gas products. The gas outlet of the condensation device is communicated with the fuel inlet of the hot blast stove.

[0012] In some embodiments, the pyrolysis solid outlet is communicated with the inlet of an activation device, and the activation device is used to activate the pyrolysis solid products. The activation time of the activation device for the pyrolysis solid products is greater than or equal to 1 hour and less than or equal to 4 hours.

[0013] In some embodiments, the pyrolysis system for waste tires further includes a gas-fired steam boiler. The steam outlet of the gas-fired steam boiler is communicated with the steam inlet of the activation device;

[0014] The steam temperature discharged from the steam outlet of the gas-fired steam boiler is greater than or equal to 800 °C and less than or equal to 1000 °C;

[0015] The activation time of the activation device for the pyrolysis solid products is greater than or equal to 1 hour and less than or equal to 2 hours;

[0016] The fuel inlet of the gas-fired steam boiler is communicated with the gas outlet of the condensation device through a third pipeline, and the fuel inlet of the hot blast stove is communicated with the gas outlet of the condensation device through a fourth pipeline. Flow regulating valves are provided on both the third pipeline and the fourth pipeline.

[0017] In some embodiments, the first preset value is greater than or equal to 180 °C and less than or equal to 220 °C;

[0018] The second preset value is greater than or equal to 500 °C and less than or equal to 550 °C;

[0019] The third preset value is greater than or equal to 600 °C and less than or equal to 900 °C.

[0020] In some embodiments, the third preset value is greater than or equal to 600 °C and less than or equal to 700 °C;

[0021] The outlet of the first pyrolysis device is communicated with the inlet of the second pyrolysis device through a first chute;

[0022] The outlet of the second pyrolysis device is communicated with the inlet of the third pyrolysis device through a second chute.

[0023] In some embodiments, a plurality of temperature measurement points are provided at the inlet of each of the first chute and the second chute, and a thermometer is provided at each temperature measurement point;

[0024] Locking valves are provided at the outlets of the first pyrolysis device and the second pyrolysis device.

[0025] In some embodiments, the waste tire pyrolysis system further includes a silo and a feeding device. The silo is used for storing waste tire particles. The outlet of the silo is communicated with the inlet of the feeding device, and the outlet of the feeding device is communicated with the inlet of the first pyrolysis device;

[0026] Both the first pyrolysis device and the third pyrolysis device are spiral reactors;

[0027] The second pyrolysis device is a rotary kiln reactor. Description of the Drawings

[0028] Figure 1 is a schematic diagram of a waste tire pyrolysis system according to an embodiment of the present invention.

[0029] Reference numerals: 1, first pyrolysis device; 2, second pyrolysis device; 21, resistance furnace; 22, power supply device; 3, third pyrolysis device; 4, hot blast stove; 5, condensation device; 6, activation device; 7, first chute; 8, second chute; 9, silo; 10, feeding device; 11, first pipeline; 12, first regulating valve; 13, second pipeline; 14, second regulating valve; 15, third pipeline; 16, fourth pipeline; 17, temperature measurement point; 18, gas steam boiler. Detailed Embodiments

[0030] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0031] The waste tire pyrolysis system according to an embodiment of the present invention will be described below with reference to the drawings. As Figure 1 shown, the waste tire pyrolysis system according to an embodiment of the present invention includes a first pyrolysis device 1, a second pyrolysis device 2, a third pyrolysis device 3, a silo 9, and a feeding device 10.

[0032] The silo 9 is used to store waste tire particles. The outlet of the silo 9 is connected to the inlet of the feeding device 10, and the outlet of the feeding device 10 is connected to the inlet of the first pyrolysis device 1. Specifically, the waste tire particles can be fed into the first pyrolysis device 1 through the feeding device 10. For example, the feeding device 10 is a screw feeder.

[0033] The first pyrolysis device 1 is used to preheat the waste tire particles. The temperature of the preheated waste tire particles discharged from the first pyrolysis device 1 is the first preset value, that is, the first preset value is the preheating temperature of the waste tire particles by the first pyrolysis device 1.

[0034] The inlet of the second pyrolysis device 2 is connected to the outlet of the first pyrolysis device 1. The second pyrolysis device 2 is used to pyrolyze the waste tire particles. The second pyrolysis device 2 is an electric heating device. The temperature of the pyrolysis products discharged from the second pyrolysis device 2 is the second preset value, and the second preset value is greater than the first preset value. That is, the second preset value is the pyrolysis temperature of the waste tire particles by the second pyrolysis device 2.

[0035] The inlet of the third pyrolysis device 3 is connected to the outlet of the second pyrolysis device 2. The pyrolysis products generated by the second pyrolysis device 2 can be fed into the third pyrolysis device 3 for a secondary reaction. The temperature of the pyrolysis products after the secondary reaction discharged from the third pyrolysis device 3 is the third preset value, and the third preset value is greater than the second preset value. That is, the third preset value is the secondary reaction temperature of the pyrolysis products by the third pyrolysis device 3. At least one of the first pyrolysis device 1 and the third pyrolysis device 3 can use flue gas as a heat source, thereby reducing the energy consumption required for pyrolysis.

[0036] In some embodiments, the first preset value is greater than or equal to 180 °C and less than or equal to 220 °C, the second preset value is greater than or equal to 500 °C and less than or equal to 550 °C, and the third preset value is greater than or equal to 600 °C and less than or equal to 900 °C. That is, the first pyrolysis device 1 can preheat the waste tire particles to between 180 °C and 220 °C, the pyrolysis temperature of the waste tire particles by the second pyrolysis device 2 is between 500 °C and 550 °C, and the secondary reaction temperature of the pyrolysis products by the third pyrolysis device 3 is between 600 °C and 900 °C.

[0037] In some embodiments, the third preset value is greater than or equal to 600 °C and less than or equal to 700 °C, that is, the secondary reaction temperature of the pyrolysis products by the third pyrolysis device 3 is between 600 °C and 700 °C. For example, the first preset value can be 190 °C, 200 °C or 210 °C, the second preset value can be 510 °C, 520 °C, 530 °C or 540 °C, and the third preset value can be 620 °C, 640 °C, 650 °C, 660 °C or 680 °C.

[0038] Such as Figure 1As shown, in some embodiments, the outlet of the first pyrolysis device 1 communicates with the inlet of the second pyrolysis device 2 through the first chute 7; the outlet of the second pyrolysis device 2 communicates with the inlet of the third pyrolysis device 3 through the second chute 8. Locking valves are provided at the outlets of both the first pyrolysis device 1 and the second pyrolysis device 2, and the locking valves can prevent the reflux of pyrolysis gas. Thus, after the locking valve at the outlet of the first pyrolysis device 1 is opened, the preheated waste tire particles in the first pyrolysis device 1 can enter the second pyrolysis device 2 through the first chute 7. After the locking valve at the outlet of the second pyrolysis device 2 is opened, the pyrolysis products after pyrolysis in the second pyrolysis device 2 can be introduced into the third pyrolysis device 3 through the second chute 8 for secondary reaction.

[0039] In some embodiments, a plurality of temperature measurement points 17 are provided at the inlet of each of the first chute 7 and the second chute 8, and a thermometer is provided at each temperature measurement point 17. Specifically, a plurality of temperature measurement points 17 (thermometers) are provided at the inlet of the first chute 7 at intervals along the transverse direction of the first chute 7, so as to measure the temperature of the preheated waste tire particles discharged from the first pyrolysis device 1, thereby monitoring the preheating effect. A plurality of temperature measurement points 17 (thermometers) are provided at the inlet of the second chute 8 at intervals along the transverse direction of the second chute 8, so as to measure the temperature of the pyrolysis products discharged from the second pyrolysis device 2, thereby monitoring the pyrolysis effect.

[0040] When the waste tire pyrolysis system according to the embodiment of the present invention pyrolyzes waste tire particles, the first pyrolysis device 1 can first preheat the waste tire particles to increase the temperature of the waste tire particles, and then introduce the preheated waste tire particles into the second pyrolysis device 2 for pyrolysis. The second pyrolysis device 2 is an electric heating device, so that the pyrolysis temperature of the waste tire particles can be accurately controlled, ensuring that the waste tire particles can be evenly heated, so as to improve the pyrolysis efficiency and pyrolysis effect. The pyrolysis products (pyrolysis gaseous products and pyrolysis solid products) after pyrolysis in the second pyrolysis device 2 can be introduced into the third pyrolysis device 3, so that secondary reactions can occur between the pyrolysis gaseous products and between the pyrolysis gaseous products and the pyrolysis solid products, thereby facilitating the improvement of the quality of the pyrolysis products. At least one of the first pyrolysis device 1 and the third pyrolysis device 3 can use flue gas as a heat source to reduce the pyrolysis energy consumption.

[0041] Therefore, the waste tire pyrolysis system according to the embodiment of the present invention can accurately control the pyrolysis temperature and improve the pyrolysis effect.

[0042] In some embodiments, flue gas can be used as a heat source in both the first pyrolysis device 1 and the third pyrolysis device 3. The second pyrolysis device includes a resistance furnace 21, and the second pyrolysis device 2 is connected to a power supply device 22. The waste tire particles in the first pyrolysis device 1 are in the heating-up stage and have not yet undergone pyrolysis. The waste tire particles do not have high requirements for uniform heating, and using flue gas for heating can reduce the energy consumption of the first pyrolysis device 1. For example, the resistance furnace 21 is connected to the power supply device 22.

[0043] The waste tire particles in the second pyrolysis device 2 enter the pyrolysis stage. The waste tire particles have high requirements for uniform heating. Using the electric heating method of the resistance furnace 21 enables precise temperature control, and a temperature accuracy of ±1°C or even higher can be achieved, reducing the temperature gradient of the waste tire particles, improving the degree of complete pyrolysis of the waste tire particles, and obtaining high-value pyrolysis products.

[0044] The third pyrolysis device 3 is in the secondary reaction stage between the pyrolysis gaseous products and the pyrolysis solid products (pyrolytic carbon black), and has low requirements for uniform heating. Using flue gas for heating can reduce the energy consumption of the third pyrolysis device 3.

[0045] For example, both the first pyrolysis device 1 and the third pyrolysis device 3 are spiral reactors. The spiral reactor can drive the waste tire particles inside to move and be heated through the spiral blades. The second pyrolysis device 2 is a rotary kiln reactor, and the power supply device 22 supplies power to the resistance furnace 21 so that the resistance furnace 21 can heat the waste tire particles and precisely control the temperature of the waste tire particles for pyrolysis.

[0046] As Figure 1 shown, in some embodiments, the waste tire pyrolysis system according to the embodiments of the present invention further includes a hot blast stove 4. The hot blast stove 4 can use the pyrolysis gas in the pyrolysis products as fuel and produce high-temperature flue gas.

[0047] The flue gas outlet of the hot blast stove 4 is connected to the flue gas inlet of the first pyrolysis device 1 through a first pipeline 11, so that the flue gas discharged from the hot blast stove 4 can be introduced into the first pyrolysis device 1 through the first pipeline 11. A first regulating valve 12 is provided on the first pipeline 11, and the first regulating valve 12 is used to adjust the flue gas flow rate in the first pipeline 11 to control the preheating temperature of the waste tire particles.

[0048] The flue gas outlet of the hot blast stove 4 is connected to the flue gas inlet of the third pyrolysis device 3 through a second pipeline 13, so that the flue gas discharged from the hot blast stove 4 can be introduced into the third pyrolysis device 3 through the second pipeline 13. A second regulating valve 14 is provided on the second pipeline 13, and the second regulating valve 14 is used to adjust the flue gas flow rate in the second pipeline 13 to control the secondary reaction temperature of the pyrolysis products in the third pyrolysis device 3.

[0049] In some embodiments, the third pyrolysis device 3 has a pyrolysis gas outlet and a pyrolysis solid outlet. The pyrolysis gas outlet is used to discharge pyrolysis gas products, and the pyrolysis solid outlet is used to discharge pyrolysis solid products. The pyrolysis gas outlet is communicated with the inlet of the condensation device 5. The condensation device 5 is used to condense the pyrolysis gas products. The gas outlet of the condensation device 5 is communicated with the fuel inlet of the hot blast stove 4. Thus, the pyrolysis gas products after the secondary reaction can be introduced into the condensation device 5 for condensation. The condensation device 5 can condense the condensable substances in the pyrolysis gas products, and the non-condensable gas (pyrolysis gas) in the pyrolysis gas products can be introduced into the hot blast stove 4 as fuel. For example, the condensation device 5 has a condensation outlet, and the condensation outlet can discharge the condensable substances in the pyrolysis gas products.

[0050] In some embodiments, the pyrolysis solid outlet is communicated with the inlet of the activation device 6. The activation device 6 is used to activate the pyrolysis solid products. The activation time of the activation device 6 for the pyrolysis solid products is greater than or equal to 1 hour and less than or equal to 4 hours. Specifically, the activation device 6 uses steam to activate the pyrolysis solid products in order to remove the impurities on the surface of the pyrolysis solid products and obtain the optimal pore structure and specific surface area.

[0051] In some embodiments, the activation time of the activation device 6 for the pyrolysis solid products is greater than or equal to 1 hour and less than or equal to 2 hours. For example, the activation time of the activation device 6 for the pyrolysis solid products is 1 hour or 1.5 hours.

[0052] In some embodiments, the waste tire pyrolysis system further includes a gas-fired steam boiler 18. The steam outlet of the gas-fired steam boiler 18 is communicated with the steam inlet of the activation device 6. The fuel inlet of the gas-fired steam boiler 18 is communicated with the gas outlet of the condensation device 5 through a third pipeline 15. The fuel inlet of the hot blast stove 4 is communicated with the gas outlet of the condensation device 5 through a fourth pipeline 16. Flow regulating valves are provided on both the third pipeline 15 and the fourth pipeline 16. Thus, the pyrolysis gas discharged from the gas outlet of the condensation device 5 can be introduced into the gas-fired steam boiler 18 through the third pipeline 15 for combustion, so that the gas-fired steam boiler 18 can generate steam, and the steam generated by the steam boiler 18 can be supplied to the activation device 6. The pyrolysis gas discharged from the gas outlet of the condensation device 5 can be introduced into the hot blast stove 4 through the fourth pipeline 16 for combustion, so that the hot blast stove 4 can generate high-temperature flue gas.

[0053] In some embodiments, the steam temperature discharged from the steam outlet of the gas-fired steam boiler 18 is greater than or equal to 800 °C and less than or equal to 1000 °C. For example, the steam temperature discharged from the steam outlet of the gas-fired steam boiler 18 is 800 °C or 900 °C.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0055] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0056] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0058] In the present invention, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A waste tire pyrolysis system, characterized in that, Comprising: A first pyrolysis device for preheating waste tire particles, and the temperature of the preheated waste tire particles discharged from the first pyrolysis device is a first preset value; A second pyrolysis device, the inlet of which is communicated with the outlet of the first pyrolysis device, for pyrolyzing waste tire particles. The second pyrolysis device is an electric heating device, and the temperature of the pyrolysis products discharged from the second pyrolysis device is a second preset value, and the second preset value is greater than the first preset value; A third pyrolysis device, the inlet of which is communicated with the outlet of the second pyrolysis device. The pyrolysis products generated by the second pyrolysis device can be introduced into the third pyrolysis device for a secondary reaction. The temperature of the pyrolysis products after the secondary reaction discharged from the third pyrolysis device is a third preset value, and the third preset value is greater than the second preset value. At least one of the first pyrolysis device and the third pyrolysis device can use flue gas as a heat source.

2. The pyrolysis system for waste tires according to claim 1, wherein, Both the first pyrolysis device and the third pyrolysis device can use flue gas as a heat source, and the second pyrolysis device is connected to a power supply device.

3. The waste tire pyrolysis system according to claim 2, characterized in that, It further includes a hot blast stove which can use the pyrolysis gas in the pyrolysis products as fuel. The flue gas outlet of the hot blast stove is communicated with the flue gas inlet of the first pyrolysis device through a first pipeline, and a first regulating valve is provided on the first pipeline for regulating the flue gas flow in the first pipeline. The flue gas outlet of the hot blast stove is communicated with the flue gas inlet of the third pyrolysis device through a second pipeline, and a second regulating valve is provided on the second pipeline for regulating the flue gas flow in the second pipeline.

4. The waste tire pyrolysis system according to claim 3, characterized in that, The third pyrolysis device has a pyrolysis gas outlet and a pyrolysis solid outlet. The pyrolysis gas outlet is used for discharging pyrolysis gas products, and the pyrolysis solid outlet is used for discharging pyrolysis solid products. The pyrolysis gas outlet is communicated with the inlet of a condensation device for condensing the pyrolysis gas products, and the gas outlet of the condensation device is communicated with the fuel inlet of the hot blast stove.

5. The waste tire pyrolysis system according to claim 4, wherein The pyrolysis solid outlet is communicated with the inlet of an activation device for activating the pyrolysis solid products, and the activation time of the activation device for the pyrolysis solid products is greater than or equal to 1 hour and less than or equal to 4 hours.

6. The waste tire pyrolysis system according to claim 5, wherein The waste tire pyrolysis system further includes a gas steam boiler, and the steam outlet of the gas steam boiler is communicated with the steam inlet of the activation device; The steam temperature discharged from the steam outlet of the gas steam boiler is greater than or equal to 800 °C and less than or equal to 1000 °C; The activation time of the activation device for the pyrolysis solid products is greater than or equal to 1 hour and less than or equal to 2 hours; The fuel inlet of the gas steam boiler is communicated with the gas outlet of the condensation device through a third pipeline, and the fuel inlet of the hot blast stove is communicated with the gas outlet of the condensation device through a fourth pipeline. Flow regulating valves are provided on both the third pipeline and the fourth pipeline.

7. The waste tire pyrolysis system according to claim 1, wherein The first preset value is greater than or equal to 180 °C and less than or equal to 220 °C; The second preset value is greater than or equal to 500 °C and less than or equal to 550 °C; The third preset value is greater than or equal to 600 °C and less than or equal to 900 °C.

8. The waste tire pyrolysis system according to claim 7, wherein The third preset value is greater than or equal to 600 °C and less than or equal to 700 °C; The outlet of the first pyrolysis device is communicated with the inlet of the second pyrolysis device through a first chute; The outlet of the second pyrolysis device is communicated with the inlet of the third pyrolysis device through a second chute.

9. The waste tire pyrolysis system according to claim 8, wherein A plurality of temperature measurement points are provided at the inlet of each of the first chute and the second chute, and a thermometer is provided at each temperature measurement point; Locking air valves are provided at the outlets of the first pyrolysis device and the second pyrolysis device.

10. The waste tire pyrolysis system according to claim 2, wherein The waste tire pyrolysis system further includes a silo and a feeding device. The silo is used for storing waste tire particles. The outlet of the silo is communicated with the inlet of the feeding device, and the outlet of the feeding device is communicated with the inlet of the first pyrolysis device; Both the first pyrolysis device and the third pyrolysis device are spiral reactors; The second pyrolysis device is a rotary kiln reactor.

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